Default Only, Primary, and Backup
In this case, the customer can follow defaults toward the provider. One link is used as primary, and the second link is used as backup. Figure 7-14 illustrates a relevant situation. Figure 7-14. Multihoming to Two Providers A customer can set or learn the default routes to the two providers either through static routesor through both providers' dynamic advertisements of default routes. The customer can preferone default over another by using administrative distance or ..
Most access points and radio cards allow the setting of transmit power. The highest value is generally 100 mW (0.1 W), with increments of lower power available. Some devices enable settings as low as 1 mW. In most cases, it is best to set all wireless LAN devices to the highest transmit power, which is generally the default setting. To configure a wireless LAN for optimum capacity, you can set the transmit power to a lower value, which effectively reduces the size of the rad..
Good Network Security Is Predictable
It is 3 a.m. and you are sleeping like a baby. That's great because you've spent many late nights protecting your new e-commerce site with the best security devices and software money can buy. You have a pair of firewalls that can handle an OC-48, NIDS boxes that allow you to craft your own complex signatures, a very expensive alarm and reporting tool that generates reports for your boss every morning, and the latest in file system checking and log analyzers for your servers...
Tunneling with Dynamic Routing Protocols
Dynamic routing and tunnels can be a dangerous combination. It is critical to ensure that the routers never get confused and think that the best path to the tunnel destination is through the tunnel itself. We offer three different ways of resolving this problem. The first is to use static routes for the tunnel destination address: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#interface Tunnel1 Router1(config-i..
You can configure the router to log the total number of TCP sessions, rather than just the number of packets, with the following set of commands: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z.Router1(config)#access-list 122 permit tcp any any eq telnet establishedRouter1(config)#access-list 122 permit tcp any any eq telnetRouter1(config)#access-list 122 permit ip any anyRouter1(config)#interface Serial0/0Router1(config-if)#ip ac..
