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920-235 - Nortel VPN Gateway Rls.7.0 Configuration and Management - BrainDump Information

Vendor Name : Nortel
Exam Code : 920-235
Exam Name : Nortel VPN Gateway Rls.7.0 Configuration and Management
Questions and Answers : 62 Q & A
Updated On : January 22, 2019
PDF Download Mirror : 920-235 Braindumps
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920-235 exam Dumps Source : Nortel VPN Gateway Rls.7.0 Configuration and Management

Test Code : 920-235
Test Name : Nortel VPN Gateway Rls.7.0 Configuration and Management
Vendor Name : Nortel
Q&A : 62 Real Questions

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Nortel Nortel VPN Gateway Rls.7.0

Apani offers Nortel Contivity VPN client for Tiger | killexams.com Real Questions and Pass4sure dumps

Porsche has added a fifth mannequin of automobile to its CarPlay-supported lineup, saying that the 2017 Panamera -- so as to arrive within the US in January -- will encompass Apple's infotainment expertise, and be considered on a giant 12.three-inch touchscreen as a part of an all-new Porsche communication administration gadget. The luxurious sedan starts at $99,900 for the 4S model, and scales as much as the Panamera faster, which sells for $146,900. different cars that presently aid CarPlay include the 2016 911 and the 2017 models of Macan, 718 Boxster, and 718 Cayman. The company did not point out assist for Google's corresponding Android Auto in its announcement. http://bit.ly/295ZQ94


How do I connect to our VPN with authentication identity? | killexams.com Real Questions and Pass4sure dumps

i want to connect instant laptops to our VPN the usage of a Nortel Contivity VPN gateway and RSA SecurID authentication. The capture is that the swap requires a gaggle id and password as neatly, and that i'm not bound the place to area those credentials within the SoftRemote client in an effort to hook up with this VPN

The Nortel VPN gateway uses XAUTH for RSE SecurID person authentication. XAUTH is an extension to ordinary IKE authentication that occurs after section one pre-shared key authentication, earlier than part two IPsec tunnel establishment. hence, make sure you observe your VPN customer's guidance for configuring a pre-shared key (not a certificate).

In SoftRemote, beneath the section 1 branch of the VPN gateway's configuration, opt for Authentication components = Pre-Shared Key; extended Authentication. Then enter the Nortel's group id and password by means of clicking on the My identity configuration. opt for id category = domain identify, enter the group id in the container beneath identity class, after which click on Pre-Shared Key to enter your Nortel's VPN gateway's password.

The wireless person will be caused to enter his or her SecurID one-time password after IKE phase one authentication is a success the use of that pre-shared key. This ensures that a laptop with an put in VPN customer and saved pre-shared key cannot be used to destroy into the VPN without the user's SecurID token.


Nortel IP PBX Trunking options: a price-beneficial technique to Do enterprise | killexams.com Real Questions and Pass4sure dumps

November 20, 2008

with the aid of SIP Trunking document Editor

With all and sundry pinching pennies and businesses struggling to keep their consumer base, service suppliers are one community that may live to tell the tale the financial tsunami by way of providing cost-efficient options.

 

Nortel offers services providers an IP Powered business solution that helps their enterprise and small- and medium-sized company (SMB) valued clientele keep funds through deploying an IP PBX trunking answer that eliminates the need for separate voice and facts connections.

 

before the times of WiMAX, smartphones and video conferencing, americans relied on wireline telephony. This intended that once mobile calls went over a public switched telephone network (PSTN), agencies would buy "trunks" - a committed line or a bundle of circuits - from their service company to connect with a non-public branch alternate (PBX).

 

For the enterprise innovators of nowadays and the long run, Nortel uses "trunking" for the IP-enabled infrastructure. This results in lessen telephony costs, speedy return on investment (ROI) as neatly as the opportunity for improved communications together with fast Messaging (IM), presence, white boarding and software sharing.

 

Nortel's IP PBX solution is certainly one of two access alternatives obtainable in Nortel's IP Powered business options, announced in October 2007.

 

So, when available in the market for a SIP PBX trunking solution, why choose Nortel?

 

Nortel is skilled and experienced in proposing IP PBX trunking via H.323 IP connectivity - a standard world standard for packet networks – and has sold greater than one million H.323 ports.

 

The company has been leading the pack for carrier VoIP services for the past six years, says market research enterprise, the Dell'Oro group.

 

With Nortel's IP PBX options, SMBs and companies are ensured that they will now not lose any capabilities when relocating from fundamental rate Interface (PRI) to IP.

 

Nortel makes it possible for agencies with numerous websites to combine PBX and hosted strains in a single company community enabling aspects like least cost routing which selects probably the most low-priced route for the name.

 

Nortel will carry provider hosted unified communications to companies in the back of an IP PBX despite the fact that their PBX does not help unified communications directly from their carrier provider.

service suppliers will advantage from Nortel’s options by means of gaining SIP PBX trunking that simplifies access infrastructure. in view that just one IP pipe connects to the enterprise for voice and statistics - and for this reason reduces operational prices.

 

furthermore, Nortel’s SIP PBX trunking offers functions providers the chance to sell salary-producing functions to their subscribers like unified communications, or VoIP VPN, as well as voice communications.

 

For SMBs and agencies, SIP PBX trunking cuts month-to-month communication prices by making it useless to subscribe to built-in functions Digital network (ISDN) basic or simple expense Interfaces (BRI / PRI). This eliminates the deserve to buy expensive PSTN gateway cards to convert IP back to BRI or PRI for new IP PBX's, and doing away with the want for separate voice and records connections.

 

SIP PBX trunking gives an easy evolution to unified communications.  Nortel estimates that unified communications can assist corporations recognize cost-reductions and an increase in productiveness of up to 18 percent.

 

in response to Gartner, "a scientific strategy to integrating and/or migrating through successive generations of telephony - comparable to PBX, IP-PBX, IP telephony (IPT), IT platform communications (ITC) and Session Initiation Protocol (SIP) - throughout an commercial enterprise can deliver tactical, operational can charge discount rates of 15 p.c to 30 % as they are carried out."

 

Nortel’s President of service VoIP and purposes solutions, Samih Elhage, explains: "Nortel's IP solution can help service suppliers offer standard yet potent IP solutions to their purchasers to help sustain with the quick tempo of contemporary enterprise enterprise ambiance. In modern day financial panorama, it is crucial to supply our shoppers with lengthy-time period, not pricey options for each their business and their shoppers.”

 

Elhage believes that Nortel's SIP PBX trunking answer is a terrific solution giving service providers a effortless, affordable way to bring superior VoIP options to their business and SMB clients.

 

“via potent, reducing-facet enterprise options like this, service providers can keep their clients ahead of the technology curve while protecting their operational charges down and their carrier choices within your means," delivered Elhage.

 

Nortel is a identified innovator in offering communications capabilities. The enterprise’s next-technology technologies, for both service provider and business networks, guide multimedia and company-crucial functions. Nortel's technologies are designed to support get rid of today's obstacles to efficiency, pace and performance by using simplifying networks and connecting americans to the assistance they need, once they want it.

 

Michelle Robart is a contributing editor for TMCnet. To read greater of Michelle's articles, please seek advice from her columnist web page.

Edited via Michelle Robart




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920-235 exam Dumps Source : Nortel VPN Gateway Rls.7.0 Configuration and Management

Test Code : 920-235
Test Name : Nortel VPN Gateway Rls.7.0 Configuration and Management
Vendor Name : Nortel
Q&A : 62 Real Questions

Shortest question are protected in 920-235 question bank.
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Microsoft Delivers Enterprise-Level Performance and Scale With Virtual Private Networking in Windows 2000 | killexams.com real questions and Pass4sure dumps

REDMOND, Wash., March 1, 2000 — Microsoft Corp. today announced that NSTL Inc. tests have illustrated the first real-world performance validation of both 5,000 simultaneous point-to-point tunneling protocol (PPTP) and 5,000 simultaneous layer two tunneling protocol (L2TP/IPSec) virtual private networking (VPN) connections, as much as two to five times the number of tunnels than other server-based VPNs at this level of performance. The tests prove that the server-based scalability of Microsoft® Windows® 2000 VPN meets the needs of even the largest organizations for as low as $5 per connection while proving the scalability ranges of PPTP and L2TP/IPSec on a server-based VPN gateway. Results also show site-to-site performance as high as 70 Mbps using L2TP/IPSec protocol, exceeding the connection speed of most server-based VPNs. With everything needed for integrated VPN, Windows 2000 is an ideal solution for businesses of all sizes, and it now offers large customers secure remote access with enterprise performance and scale at less than half the price of other server-based VPN solutions.

“In the age of connected businesses, customers require a secure, fast, scalable and affordable way to connect their employees, customers and partners to their Business Internet. Microsoft is addressing this customer need with Windows 2000,” said Deborah Willingham, vice president of Windows Marketing at Microsoft. “NSTL proves that Windows 2000 Advanced Server can deliver this scalability without compromising on price or performance.”

Organizations are moving to remote access through Internet links using VPN technology to reduce long-distance and 800 telephone-number charges for traditional direct-dial connections. In the past, companies were constrained by performance and scalability in server-based solutions, and add-on software made installation and configuration complex. Today, two approaches to VPN solutions are available: open server platform or hardware appliances. Windows 2000 Advanced Server is an exceptional choice for customers that want the flexibility of a multipurpose server solution without having to compromise performance. Windows 2000 Professional is a powerful, complementary and interoperable client solution for customers planning to use enterprise VPN solutions from vendors such as Cisco Systems Inc., Lucent Technologies Inc., Nortel Networks Corp. and 3Com Corp. that have committed to support its native standards-based capabilities.

“The Windows 2000 VPN solution provides Continental’s remote sales representatives with the platform they need to remain competitive and outsell the competition,” said Eric Craig, manager of Distributed Systems at Continental Airlines Inc. “We wouldn’t have even considered doing this without Windows 2000 VPN technology.”

“VPN support is built-in and integrated with the security,” said Patrick Husting, chief technology officer at eHome. “That means we didn’t have to acquire, test and configure a third-party product, which saves both software and administration costs. The amount of time saved with its ease of functionality is incredible.”

With Windows 2000, Microsoft delivers a complete, secure, scalable and manageable remote-access solution with true standards-based interoperability for customers ranging from small businesses to the enterprise. The Windows 2000 Server operating system includes a VPN gateway, authentication, and policy management and deployment tools out of the box. Rich reporting, accounting and trend analysis from Telco Research Corp. is also included as part of the resource kit.

All versions of the Windows 2000 operating system include VPN client capability with choices for security protocols and authentication methods to address diverse deployment requirements. Internet Engineering Task Force (IETF)-standard L2TP/IPSec protocol is included for situations that demand the most advanced remote-access security, and the broadly supported PPTP protocol can be utilized for simpler and lower-cost situations. Both protocols offer customers the option to use smart cards and other strong authentication services to increase remote-access security, and both integrate with Windows 2000 user account and remote-access policy management. Windows 2000 Server is licensed for up to 1,000 simultaneous VPN, and dial-up remote access connections and Windows 2000 Advanced Server is licensed for up to 5,000 simultaneous connections.

About the NSTL Test Results

The NSTL tests were done on a four-processor Intel Xeon 550MHz system with 1 GB of RAM, the Windows 2000 Advanced Server operating system and Intel Pro/100 S Server adapters for IPSec encryption offload. For remote-access connections, the tests showed that such a system can support 5,000 simultaneous users at typical remote-access loads through 56Kbps links. Details regarding the NSTL testing can be found at http://www.microsoft.com/windows2000/library/howitworks/ communications/remoteaccess/vpnperf.asp .

About Windows 2000 and Microsoft

Windows 2000 is an ideal platform for the next generation of business computing and addresses the full range of customers’ computing needs, from laptops and desktops to high-end clustered servers. The operating system helps organizations Internet-enable their business with a reliable, manageable infrastructure that is optimized for existing and emerging hardware. More information about Windows 2000 is available at http://www.microsoft.com/windows2000/ and http://www.microsoft.com/technet/ .

Founded in 1975, Microsoft (Nasdaq MSFT) is the worldwide leader in software for personal and business computing. The company offers a wide range of products and services designed to empower people through great software – any time, any place and on any device.

Note to editors: If you are interested in viewing additional information on Microsoft, please visit the Microsoft Web page at http://www.microsoft.com/presspass/ on Microsoft’s corporate information pages.


Linux on the Horizon: Users and Vendors Eye Linux for VPNs | killexams.com real questions and Pass4sure dumps

Linux on the Horizon: Users and Vendors Eye Linux for VPNs

The worldwide VPN equipment market is expected to reach two billion dollars in 2004, which bodes well for Linux product developers. Linux should provide enterprises with alternatives to the Solaris and NT products, currently dominating the market, as vendors and users both realize that Linux is out there.

The demand for Virtual Private Network (VPN) solutions running in a Linux environment is growing, although the actual size of the market is hard to pinpoint. The worldwide market for VPN equipment is expected to reach two billion dollars in 2004, according to Infonetics Research. For VPN services, the 2004 worldwide market will hit $18 billion, according to IDC.

Equipment providers, software developers and analysts agree that the demand for VPNs, in general, represent fertile ground for Linux product developers. Vendors already selling Linux equipment can expand their applications to include VPN offerings. Moreover, with innovative Linux networking solutions cropping up – such as the ANG 1000 gateway from Enterasys Networks and Linux Secure Virtual Network (SVN) from Check Point Software Technologies – the Linux loyalists will be able to implement VPNs that satisfy their security and centralized management requirements, as well as their budgets.

"Companies are waking up to this whole VPN thing and are getting pretty excited about it," says Opus One Senior Partner, Joel Snyder, a consultant for organizations implementing VPNs.

Until recently, VPN platform alternatives were either Solaris or NT. "No one likes NT as a security solution, so they’ve been pushing Solaris," asserts Snyder. "Solaris has a cost-benefits issue. Plus, if you have Intel, you don’t want Solaris, so users are flipping over to Linux."

As for the future of Linux VPNs, Opus One’s Snyder tells us that we’re going to see alot of small enterprises absorbing Linux.

When you see Linux, people are thinking cheap," says Snyder, adding that current Linux users are generally not in the enterprise space, so they’re not thinking about how to manage thousands of seats. "That differentiates Linux as a great platform for development from Linux as an enterprise server."

Two free IPSec packages exist in the Linux space – Linux Free S/WAN and KAME. Linux Free S/WAN and KAME are an implementation of IPSec and IKE for Linux that uses strong cryptography and builds secure tunnels through untrusted networks, resulting in a VPN.

"Both are outstanding, but neither are manageable worth a dime," maintains Snyder. "If a business has four branch offices and wants IPSec on the cheap, it can buy dumb PCs, stick Linux Free S/WAN on them and manually configure them for a total cost of $100." On the other hand, he says, "Nokia will want to sell you a $5,000 box, plus three other servers, totaling $10,000."

VPNs consist of dozens of sites requiring proper coordination, meshing and configuration. Each piece needs to interrelate to every other piece. Citing weak management on the Linux side for VPNs, Snyder notes that users are turning to commercial, prepackaged solutions, rather than roll-your-own Linux solutions.

"They happen to stick it on Linux, because Linux is a good thing between your firewall and the box," Snyder continues. "[Linux] gets out of way quickly. Firewalls ask the operating system, ‘I need to store stuff on disk and get to the NIC cards.’ Firewalls don’t want GUI, fancy recovery or anything built into the operating system. So, when you want to build something small and quick, Linux is an ideal candidate. Firewall products don’t care what they’re on top of."

Developers, such as Watchguard Technologies, use Linux, but transparently to the buyer, as OEMs do. Watchguard runs Linux underneath its hardware firewall product. "The buyer sees a red box that does the VPN and firewall, and the fact it has Linux is irrelevant," says Snyder.

Recently, Check Point Software Technologies started developing Linux-based systems in response to its customers’ requests. Its Linux SVN architecture gives Linux users access to the same Internet security benefits already available on other major operating systems and platforms.

Seizing the opportunity, Check Point also is working with hardware vendors to make firewall and VPN appliances. "A number of appliance vendors plan to use Linux as the operating system in their appliances," says Check Point’s Product Marketing Manager, Mike Lee. "The vendors will buy software from Checkpoint and sell a bundled VPN solution."

Lee touts Linux as a good security platform. "For us, Linux is probably the highest performing platform we have," Lee says, adding that in performance benchmarking, Linux consistently comes out at the top.

Other vendors are turning to Linux as a platform for their VPN solutions. "Most people think about Linux for general-purpose computer applications, but Linux is also a great system for special-purpose networking and Internet applications," says Openreach Inc.’s CEO, Mark Tuomenoska.

According to Tuomenoska, although software VPNs are flexible and run on readily available, inexpensive, general-purpose computers, these systems – UNIX and Microsoft Windows NT – don’t perform as well and are not as reliable as network equipment. On the other hand, hardware VPNs – designed to deliver optimal performance and reliability – are proprietary and expensive to buy and deploy.

"Linux-based VPNs provide the best of both worlds – the flexibility and low costs of a software-based solution, with the performance and reliability of a hardware-based solution," says Tuomenoska.

The Adoption Challenge

The superiority of Linux is not in dispute, but widespread adoption will be a challenge, partially due to the mystique surrounding Linux. "Linux has been the domain of the techies," says Tuomenoska. "The critical success factor for Linux is making it accessible to more people. Linux, technically, is a superior solution, but it’s not taking off because it’s esoteric."

"NT is not reliable enough for network applications and is too inefficient to provide high-performance," continues Tuomenoska. "And traditional UNIX systems don’t have the support required for a larger community of users."

Now enterprise customers who’ve invested in learning and managing Linux for other applications can reuse that learning to build advanced data networking applications.

"Today, most enterprises implementing VPN solutions have staff that really understand Linux and can set up the VPNs themselves using open-source projects or software available in its supplier’s Linux distribution; or, look to service providers who use Linux to implement VPN, but don’t require the customer to learn all the details of the VPN software, per se," says Tuomenoska.

Companies like OpenReach are creating services using Linux-based VPN software, allowing users to administer their entire VPN through a graphical user interface without having to make an investment in understanding all the ins and outs of Linux.

"Linux is [proving] to be a good alternative to embedded systems," asserts Tuomenoska. "Embedded systems were designed to do high performance, and one of the reasons why Cisco, Lucent and Nortel are able to sell VPN equipment is because Windows and UNIX can’t keep up with their embedded operating systems."

Responding to a growing desire on the part of thousands of customers who want to use Linux with VPN connections, Cisco Systems offers a Linux-based VPN solution.

"People make up their minds that they want to run Linux," asserts Cisco’s Product Manager, Pete Davis, who sees that Cisco’s challenge lies in bringing Linux, a multi-user system, to the same level as a VPN client. Typically, in this environment the VPN is not manageable or scaleable.


VPN client alternatives: Layer 2 Tunneling Protocol (L2TP) over IPsec | killexams.com real questions and Pass4sure dumps

by Lisa Phifer, Core Competence

Those searching for "free" VPN client software have many options. In my last column, I discussed Point-to-Point Tunneling Protocol (PPTP) -- a readily-available, easy-to-use client with known vulnerabilities. This month, we'll consider a more robust VPN client alternative: Layer 2 Tunneling Protocol (L2TP) over IPsec.

L2TPL2TP is an IETF standard for tunneling Point-to-Point Protocol (PPP) across any intervening network. It forwards data transparently from an access concentrator (LAC) to a network server (LNS). The LAC may be an individual host or an ISP's network access server. For example:

  • Consider an ISP that purchases dial-up services from another ISP. When subscribers dial into the wholesaler's LAC, PPP sessions may be forwarded over an L2TP tunnel to the reseller's LNS. This configuration is referred to as compulsory mode.
  • Consider an individual dialing into a local ISP or associating with a wireless hotspot. After the host is connected to the Internet, data can be sent through an L2TP tunnel from a VPN client on the host to a VPN gateway. Because the user decides whether and when to open the tunnel, this is known as voluntary mode.
  • In both cases, L2TP provides data-independent framing, the ability to multiplex IP and non-IP protocols, tunnel endpoint authentication, and dynamic address assignment. For compulsory tunnels inside private networks, L2TP by itself may be fine. To tunnel data securely over the Internet, L2TP must be combined with a protocol that prevents eavesdropping, modification and replay.

    Securing L2TPRunning L2TP over a secure IPsec transport is defined by RFC 3193. In this approach, L2TP packets are exchanged over User Datagram Protocol (UDP) port 1701. UDP payload is protected by an IPsec Encapsulating Security Payload (ESP) transport mode connection between the LAC and LNS.

    IPsec ESP provides confidentiality, per-packet message authentication, and anti-replay protection for all L2TP, including both control and data packets. In contrast, the Microsoft Point-to-Point Encryption (MPPE) used by PPTP encrypts only data and does not prevent forgery or replay.

    The Internet Key Exchange (IKE) protocol is used to establish the IPsec transport. First, IKE lets the LAC and LNS authenticate each other with digital certificates or a shared secret. Then, L2TP authenticates the user over this encrypted transport. PPTP provides user authentication only, over a cleartext channel that risks dictionary attack.

    IKE also lets the LAC and LNS safely derive crypto keys used by IPsec. MPPE provides weaker key management -- for example, it cannot ensure that new keys are unrelated to previously-used keys like IKE can.

    Using L2TP over IPsec is more secure than PPTP, but there are some drawbacks:

  • This approach encapsulates application data in PPP, PPP in L2TP, L2TP in UDP, UDP in ESP, ESP in IP. Even without counting header bytes, it is easy to see that multi-layer encapsulation generates longer packets.
  • IKE authentication with digital certificates is strong, but requiring every client to have its own certificate increases installation complexity. Although you can use a group secret instead, doing so largely negates the added value of IKE authentication.
  • IKE and IPsec have many negotiable options, making configuration more complex than PPTP. However, a default policy that dictates options can reduce complexity.
  • Running IPsec through a device that performs network address translation (NAT) can be a problem. New draft standards overcome this by encapsulating ESP in UDP.
  • Windows 2000/XP VPN clientMicrosoft championed L2TP/IPsec by including it in Windows 2000 and Windows XP VPN clients. Strictly speaking, these embedded clients are commercial software, purchased with your licensed copy of Windows. However, they are "free" in the sense that you don't have to buy or install additional software for each client PC.

    The Win2000/XP VPN client supports both PPTP and L2TP. By default, this client attempts to launch an L2TP tunnel, downgrading to PPTP if L2TP fails. Launching L2TP is therefore quite similar to launching PPTP -- just identify the LNS by IP address or hostname and supply a login/password for user authentication.

    As I discussed last month, Microsoft's VPN client offers a choice of authentication methods like PAP, CHAP, MS-CHAPv2, or EAP. Because L2TP control packets are encrypted by IPsec, password methods like PAP and CHAP can be used safely. Smart cards or digital certificates are still stronger choices. In addition, user certificates stored on smart cards can prevent misuse of lost or stolen PCs that might otherwise pass IKE authentication with a machine certificate stored on disk.

    To simplify configuration, Win2000/XP automatically applies a default policy for IKE and IPsec. This causes Windows to automatically launch an IPsec transport mode connection whenever traffic is sent or received over UDP port 1701. If this default policy meets your needs, then using L2TP will be relatively simple. If not, you can set the "ProhibitIPsec" registry key and learn how to configure your own Windows security policies.

    You won't have to install software when using the embedded Win2000/XP VPN client, but you will need to install IKE credentials. The default policy requires a digital certificate on every client PC. The Microsoft Windows Certificate Authority (CA) supplies a Web page for users to submit requests and install certificates on their own PCs. Of course, users must enroll when already connected securely -- for example, before taking a laptop out on the road. You can also use the Windows CA without self-enrollment, use another vendor's CA, or purchase certificates from a third-party service.

    Certificate enrollment is really the step that makes L2TP setup more expensive than PPTP. To avoid dealing with certificates, small and home offices may opt for weaker IKE authentication with shared secrets. When doing so, choose a long random string and caution users to protect this "password". Because all users must present the same secret, loss or disclosure will impact everyone. If your VPN supports a large user community, certificates may be more hassle up front, but will prove less expensive over time. Another "happy middle" option is to purchase one group certificate for all L2TP users.

    Windows 98/ME/NT VPN clientLast summer, Microsoft released an L2TP/IPsec VPN client for legacy Win32 operating systems: Windows 98, ME, and NT. This VPN client, developed by SafeNet for Microsoft, is freely available for download from Microsoft's website. That means you won't have to pony up extra cash for client licenses. But this alternative is not quite as simple as using an embedded client -- you'll need to install new software on every PC.

  • On Windows ME, just check to make sure you are running IE 5.5 or later before installing the Microsoft L2TP/IPsec VPN client.
  • On Windows 98, you must first install Dial-Up Networking 1.4 and IE 5.01 or later, then add the Microsoft L2TP/IPsec VPN client.
  • On Windows NT4, you must start with SP6 or later. Install the Remote Access Service and the PPTP protocol (even if you don't plan to use PPTP). Next, add the L2TP/IPSec driver (RASL2TPM) as a RAS capable device and configure it for TCP/IP. Then complete installation of the Microsoft L2TP/IPsec VPN client.
  • As when installing any software, you may run into problems like incomplete installation, missing pre-requisites, the presence of incompatible software (other VPN clients), or incompatible network settings (like Internet Connection Sharing). In my opinion, installation is straightforward on ME and 98, well within reason for most end users. NT installation requires admin privileges and is more suitable for IT support staff. The Administrator's Guide suggests bundling required software onto a distribution CD, along with any group certificate or Connection Manager profile that should be used by clients.

    To dial-up networking, the L2TP/IPsec client looks like an adapter or a remote access device. Configuration (and therefore policy flexibility) is intentionally minimal. You will either need to install a certificate that can be used by this client for IKE authentication or you will need to manually configure the client with a shared secret (see previous discussion). There is no user-visible interface to modify other security policy parameters.

    This 98/ME/NT client includes two nice features not found in the Win2000/XP client:

  • Troubleshooting is made easier by a built-in traffic log that can be enabled or disabled by end users. Log contents are still best interpreted by IT staff, but users can more easily obtain this log when they experience problems on the road or at home.
  • This client supports draft two of the new UDP encapsulation and NAT traversal standards. It can automatically determine whether NAT is present somewhere between the LAC and LNS. If both ends support compatible versions of NAT traversal, they can compensate for problems that otherwise break the IPsec transport. This feature can be used when the LNS is a .NET server or another vendor's L2TP server with NAT traversal (e.g., Cisco). It cannot currently be used when the LNS is a Windows 2000 server.
  • Windows 95 and Pocket PC…notMicrosoft's L2TP/IPsec VPN client does not run on Windows 95 or Pocket PC. I am not aware of any shareware L2TP/IPsec VPN clients for these operating systems. SafeNet's commercial VPN client, SoftRemote, does support L2TP over IPsec on any Win32 OS. But I have not seen an L2TP/IPsec VPN client for Pocket PC -- or for any other PDA OS. If you know of a free L2TP/IPsec VPN client for any PDA platform, I would like to hear from you. The same goes for MacOS.

    Linux L2TPDOn the other hand, if you're looking for a Linux or BSD solution for L2TP/IPsec, L2TPD is a good place to start. L2TPD provides a command line interface that opens a virtual tty through which PPP can be sent from LAC to LNS.

    This open source L2TP client/daemon is available from http://www.l2tpd.org/. Previously hosted at SourceForge, this project recently found a new home at IgLou. According the Web site, tunnel authentication is currently broken, and some users interoperate with Windows L2TP by disabling IPsec. That may be relatively easy, but it does not provide secure (authenticated, encrypted) tunneling. Although I have not tried it myself, posts indicate that L2TPD can be combined with an open source IPsec implementation like Free S/WAN to encrypt L2TP over IPsec.

    L2TP network serversOf course, you cannot use an L2TP client without an L2TP network server. L2TP/IPsec clients are an obvious match when using a Windows 2000 Server as your VPN gateway. Windows is not your only alternative, but non-Windows L2TP gateways are less common than non-Windows IPsec gateways. For example, L2TP server software is also available from Checkpoint and lt2tpd.org. L2TP-capable hardware appliance vendors include 3Com, Cisco, Netscreen, Nortel, and PacTech. Most gateways that implement L2TP are access concentrators designed to support remote user VPNs over any of several protocols (L2TP, IPsec, PPTP, etc).

    The VPN Expert: VPN client alternatives, part 2 -- PPTPThe VPN Expert: VPN client alternatives, part 1



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