Using the ip default-network Command
RIP and EIGRP can inject default routes by using the ip default-network command. To do so, the following must be true on the local router: ■ The local router must configure the ip default-network net-number command, with net number being a classful network number. ■ The classful network must be in the local router’s IP routing table, via any means. ■ For EIGRP only, the classful network must be advertised by the local router into EIGRP, again through any means. ..
Troubleshooting RIPv2 and RIPng
Two configuration problems common to RIPv2 are mismatched versions and misconfigured authentication. Both difficulties are easy to discover with debugging, as Example 6-29 shows. Example 6-29. Debugging reveals mismatched versions and misconfigured authentication. Jemez#debug ip rip events RIP event debugging is on Jemez# RIP: ignored v1 packet from 172.25.150.249 (illegal version) RIP: ignored v2 packet from 172.25.150.249 (invalid authentication) Jemez# A more likel..
Network Security Promotes Good Network Design
Although it happens far less often now, I still occasionally sit down with a customer who says, "OK, the network design is done, now we need to think about security. We're certain we need a firewall and have also heard something about IDS." Designing secure networks in this manner puts you on a fast track to a network design in which the security is tacked on, interferes with the performance of the network, and is viewed by the rest of the Information Technology (IT) staff a..
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 remove translation table entries for DNS queries after only 60 seconds. You can adjust these parameters using the ip nat translation command, which accepts arguments in seconds: ..
To enable the assignment of static IP addresses from a text file, first you must create a static DHCP mapping file on your TFTP server: Freebsd% cat /tftpboot/dhcp.static *time* Aug 17 2006 03:52 PM *version* 2 !IP address Type Hardware address Lease expiration 10.1.1.16 /24 id &nbs..
