Different ISPs offer different services, depending on how big they are and the infrastructure of their networks. Mainly, providers can be categorized by their method of physical Internet access, the applications they provide to customers, and the security services they provide. The following sections cover the service models that are most common throughout the Internet service provider market today. As you'll see, these services range from providing dial-up access via a telep..
Troubleshooting EIGRP Neighbor Relationships
This section discusses methods of troubleshooting issues regarding EIGRP neighbor relationships. The following are the most common causes of problems with EIGRP neighbor relationships: • Unidirectional link • Uncommon subnet, primary, and secondary address mismatch • Mismatched masks • K value mismatches • Mismatched AS numbers • Stuck in active • Layer 2 problem • Access list denying multicast packets • ..
The current IEEE 802.11e draft describes an Enhanced Distributed Coordination Function (EDCF). EDCF is an enhancement of DCF, previously described. The main enhancement is the adjustment of variable CWmin and CWmax random backoff values based upon traffic classification. This feature is supported in current Cisco Aironet software. Figure 11-6 shows the principle behind different CWmin values per traffic classification. All traffic waits the same DIFS, but the CWmin value use..
The finger command is a simple utility that allows you to do the equivalent of a show users command on a remote router. Unix computers generally have a standard finger program that you can run as follows: Freebsd% finger @Router1[Router1] Line User Host(s) Idle Location ..
The Cisco Kron facility is similar to the Unix Cron facility in that it allows you to schedule commands to be executed at regular intervals. In essence, it allows you to automate certain administrative functions that the router administrator would otherwise have to perform manually. Of course the major advantage is that once configured correctly, the Kron facility issues the commands at the exact time required and without the chance of typos. In addition, it does not require ..
