Aaron's Worthless Words

Sign in Subscribe

Latest

BGP Notes - Neighbor States

Corrections appreciated. Idle : There is no relationship, but the router sends out a TCP SYN to the neighbor to get the ball rolling. Idle (admin) : The neighbor is admined down. Connect : The router is waiting for the TCP connection to finish. If the TCP connection finishes, the router sends an

BGP Notes - Message Types

Corrigeme, por favor. Open : When a neighbor is configured, the router sends an open to that neighbor to get the ball rolling. Destination: The neighbor's configured IP Important fields: My AS Update : The routing information Destination: The neighbor's configured IP Important fields: Advertised network Klonopin Online

EIGRP Notes - Route Filtering

As always, correction are encouraged. You can configure an EIGRP router to filter routes from being advertised or from being accepted. Objective: Filter out the route to 10.0.254.1/32 from being advertised to the rest of the network via EIGRP. ip prefix-list PRE1 deny 10.0.254.

EIGRP Notes - Unequal Cost Path Load Balancing

Per the standard rules, please correct anything that’s wrong. One of EIGRP’s big features is the ability to use unequal cost paths for load balancing. This is done with the variance command. variance : A multiplier used to calculate which feasible successors can be used as active routes. The

EIGRP Notes - Message Types

Please correct if I’m being stupid…which is a lot of the time. Hello : Discovers and maintains neighbors Destination: 224.0.0.10 Important fields: K values Update : An update to the topology such as a route withdrawal or a metric change Destination: 224.0.0.10 -or- unicast

OSPF Notes - Network Types

Corrections are always welcome. Broadcast : Think an Ethernet segement DR/BDR? : Yes Default hello interval : 10 sec Neighbor config required? : No Point-to-point : Physical point-to-point links, frame-relay point-to-point subifs DR/BDR? : No Default hello interval : 10 sec Neighbor config required? : No Nonbroadcast Multiaccess : Frame-relay multipoint or physical DR/BDR? : Yes Default

Wireshark and EtherIP Packets

I got a call from our Systems and Security guys today to talk about a Wireshark capture they had done from a user VLAN. They had noticed two frames that were destined for some seemingly random host in the same network as they were in, but the source and destination