Policy Routing Based on Traffic Source

Consider the example shown in Figure 8-6. Assume that AS1 was assigned network numbers from two different providers. The 10.10.10.0/24 range was taken from AS3, and the 11.11.11.0/24 range was taken from AS4. AS1 wants to have any traffic originated from its 10.10.10.0/24 networks to be directed tow...

Dissecting the Component Parts of an IP Address

First, deducing the size of the three parts (classful view) or two parts (classless view) of an IP address is important, because it allows you to analyze information about that subnet and other subnets. Every internetwork requires some number of subnets, and some number of hosts per subnet. Anal...

Using SNMP to Copy a New IOS Image

Before you can upload or download the router's IOS image to a TFTP server, you have to set up a valid read-write SNMP community string: Router#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#snmp-server community ORARW rw Router(config)#end ...

Generating a Report of Interface Information

The netstat.pl script uses SNMP to gather IP subnet information from a list of routers. This ensures that the information is accurate and current. The script gathers all of the pertinent information about each router's IP interfaces and outputs this information as a CSV file. The netstat.pl scrip...

Adjusting NAT Timers

The router will keep NAT entries in the translation table for a configurable length of time. For TCP connections, the default timeout period is 86,400 seconds, or 24 hours. Because UDP is not connection based, the default timeout period is much shorteronly 300 seconds, or 5 minutes. The router will...

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