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A. XAUTH and mode config are not IETF standards. They have been extensively analyzed and have been rejected because of major flaws. Therefore, IPSec TM implementations including these protocols cannot claim standards status and have known defects for which no fix is available. XAUTH changes a core IPSec protocol named Internet Key Exchange (IKE). The IKE protocol is critical to IPSec, as it is used to negotiate the security parameters of the IPSec security association, including computer trust, encryption keys, and security methods. The IKE protocol took approximately nine years to develop within the IETF. Every proposal was carefully scrutinized for security weaknesses and was rejected if it did not meet the rigorous requirements for strong security. In contrast, XAUTH was developed in a short period of time and without the same scrutiny as IKE. XAUTH fundamentally changes the IKE protocol. The original authors of the IKE protocol reviewed XAUTH and discovered serious security issues (explained in the article, Authentication Vulnerabilities in IKE and XAUTH with Weak Pre-Shared Secrets ) that adversely affect the important benefits of IPSec. Under criticism from IETF members, XAUTH was removed from the IETF standards track. In a related activity, the IETF Security Area Directors issued an e-mail on August 2, 2001, declaring a moratorium on changes to the IKE protocol. In this mail, they indicated that IPSec security could be adversely affected by the complexity of IKE and that IKE changes should not be made until IKE was simplified. The mail went on to list various technologies (including XAUTH, hybrid auth, and others) as not helping to simplify IKE. As a result, L2TP/IPSec remains the only IETF standard method for remote access VPN with IPSec encryption.

In this configuration, DHCP Server A manages a different scope of addresses from that of DHCP Server B, and neither has any information about addresses managed by the other. A problem arises when a client that has previously registered with Server A, for example, releases its name during a proper shutdown and later reconnects to the network. When the client (Client A) reboots, it tries to renew its address lease. However, if Server B responds to Client A s request before Server A does, Server B rejects the foreign address renewal request with a negative acknowledgment (NACK). As a result of this process, Client A s address resets, and Client A is forced to seek a new IP address. In the process of obtaining a new address lease, Client A might be offered an address that places it on an incorrect logical subnet. Figure 7-10 shows how, using superscopes on both DHCP servers, you can avoid these problems and manage two scopes predictably and effectively. In this configuration, both servers are still located on the same physical subnet. A superscope included on

Paging An operation that causes the operating system to swap pages of memory is much slower than an operation that works on only one page of memory. Sometimes a simple change makes a huge difference. In the next example, one programmer

7-30

7

A. There are several key reasons for this. XAUTH contains serious security flaws for which no known fix is available, and it has been rejected for IETF standardization. Given this, Microsoft believes that it would be irresponsible to endorse this technology, especially when IETF standardsbased technology is under development. XAUTH is incompatible with existing IETF authentication frameworks such as EAP and GSS-API. This means that developers who want to develop authentication techniques for the Windows platform would need to develop their methods using multiple, incompatible APIs. This prevents customers from using existing authentication methods within remote access scenarios. For developers, it increases the complexity and cost of developing a new authentication method. Rather than introducing another authentication framework to the detriment of customers and developers,

for ( column = 0; column < MAX_COLUMNS; column++ ) { for ( row = 0; row < MAX_ROWS; row++ ) { table[ row ][ column ] = BlankTableElement(); } }

both Server A and Server B includes as members both scopes defined on the physical subnet. To prevent the servers from issuing leases in each other s scopes, each server excludes the full scope range belonging to the other server.

Superscope: Scope A: 10.111.111.11 10.111.111.254 Scope B: 222.222.222.11 10.222.222.254 Exclusions: 10.222.222.11 10.222.222.254 Superscope: Scope A: 10.111.111.11 10.111.111.254 Scope B: 10.222.222.11 10.222.222.254 Exclusions: 10.111.111.11 10.111.111.254

This is a nicely formatted loop with good variable names, so what s the problem The problem is that each element of table is about 4000 bytes long. If table has too many rows, every time the program accesses a different row, the operating system will have to switch memory pages. The way the loop is structured, every single array access switches rows, which means that every single array access causes paging to disk. The programmer restructured the loop this way:

Client A: 10.111.111.11 Client A1: 10.111.111.12 Client A2: 10.111.111.13