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Lengthen the NLSP transmission and retransmission intervals to reduce NLSP network traffic Lengthen the link service advertisement intervals to reduce LSA bandwidth utilization On each LAN interface, NLSP selects a designated router in the same way as other link state protocols do A DR generates routing information on behalf of all routers on the LAN to reduce protocol traffic on the LAN segment If the DR were not there, each router on the LAN would have to send LSA information to all the other routers The selection of a DR usually is automatic, but it can be influenced by router configuration commands Because the DR performs more work than other routers on the LAN, you might wish to ensure that either the least busy or most powerful router always is chosen as the DR To ensure that a chosen router becomes the DR, increase its priority from the default of 44 to make it the system with the highest priority To give a router a priority of 55, input the following commands (This is for a router with its Ethernet 0 port connected to the LAN determining its DR) Router1(config)#interface E 0 Router1(config-int)#ipx nlsp priority 55 NLSP assigns a metric to a link that is based on the link throughput (similar to IGRP) No account of load is taken into consideration If you want to manually influence the selection of routes, you can change the metric assigned to any link with the following command (the example shows a metric of 100): Router1(config)#interface Serial 0 Router1(config-int)#ipx nlsp metric 100 The NLSP transmission and retransmission timers are adequate for just about every installation If you feel the need to alter these parameters, however, the following commands show how to set the hello packet interval to 20 seconds and the LSA retransmission time to 60 seconds: Router1(config)#interface E 0 Router1(config-int)#ipx nlsp hello-interval 20 Router1(config-int)#ipx nlsp retransmit-interval 60 Similarly, the intervals at which LSAs are sent out and the frequency of the Dijkstra (the Shortest Path First) algorithm execution normally are adequate If your network contains links that are constantly changing state from up to down, however, these values can be modified as follows to an LSA interval of 20 seconds and minimum time between SPF calculation of 60 seconds: Router1(config)#lsp-gen-interval 20 Router1(config)#spf-interval 60 If these values are changed, they should be uniform across an entire internetwork for efficient operation.

In this chapter you have learned more about the TCP/IP protocol and some of its functionality, such as subnetting and routing You have learned that from time to time you may need to divide a network range into multiple network blocks (subnets) to follow the physical structure of the network You have also learned that the IP protocol uses a routing table to determine how to deliver data to its destination This chapter has also discussed routing protocols, and you have learned the difference between a distance vector routing protocol and a link state routing protocol

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access list The purpose of anti-spoofing entries is to block IP packets that have a source address of an internal network or a source address that is invalid A list of invalid source addresses include unregistered addresses, loopback addresses, and multicast addresses No legitimate packets should ever contain a source address of any of these types Attackers frequently use these address ranges as the source address of their packets to prevent administrators from tracing them to the originating source machine Here are the additions to our access list that will block the IP addresses: Access-list 101 deny ip 1601000 00255255 any Access-list 101 deny ip 1601100 00255255 any Access-list 101 deny ip 10000 0255255255 any Access-list 101 deny ip 1721600 031255255 any Access-list 101 deny ip 19216800 00255255 any Access-list 101 deny ip 127000 0255255255 any Access-list 101 deny ip 224000 31255255255 any The anti-spoofing entries should be placed before all other entries in our inbound access list This ensures that only packets with valid IP addresses will be examined by our remaining entries Finally, it is always prudent to block packets originating from the DMZ This step is taken so that if a host in the DMZ becomes compromised, an attacker cannot use the compromised host as a "jumping-off point" to further compromise hosts on the internal network If possible, access from hosts on the DMZ to hosts on the internal network should be blocked entirely However, in most cases this is not an option Often an administrator needs to perform system maintenance tasks on the machines in the DMZ from their personal workstation on the internal network Otherwise, the Web server on the DMZ will serve internal users as well as Internet users At a minimum, hosts on the DMZ segment should not be allowed to initiate connections to either the internal network or the Internet Below is an additional access list blocking initiated connections: Interface ethernet 0 Ip access-group 103 in Access-list 103 permit tcp 1601000 00255255 any established Access-list 103 deny ip 1601000 00255255 1601100 00255255 Access-list 103 permit tcp 1601011 0000 eq 20 any Let's examine a few characteristics of this access list The first entry permits any packets from the 1601000 subnet if they are part of an established connection The packets could be destined for either the Internet or our internal network The second entry blocks all other IP packets from the DMZ segment to our internal network The last entry permits packets initiated from our DMZ server to the Internet if the source port is 20 This is necessary to allow FTP connections to our server from the Internet.

q Remember to calculate the network ID, first valid address, last valid address,

q The IP protocol is responsible for routing data to its destination q You can view your routing table with route print q You may add a route to a routing table with route add q You may delete a route from the routing table with route delete q You may use a dynamic routing protocol such as RIP or OSPF so that the

Monitoring an NLSP/IPXWAN Internetwork Let's look at the pertinent configuration details of the Cisco router at the center of the internetwork shown in Fig 5-7 This router is set up to run NLSP on all interfaces and IPXWAN on its serial link to NetWare server 3, as shown in the excerpt from its configuration file also in Fig 5-7

routers share routing table information with one another, eliminating the need to manually configure the routes individually

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