Stretch, from Packetlife.net recently produced an excellent article explaining IPv6 and EUI-64 addressing. The article is reproduced, verbatim, here: Read more…
TCP and UDP small servers are servers (daemons, in Unix parlance) that run in the router which are useful for diagnostics. Read more…
Context-Based Access Control (CBAC) intelligently filters TCP and UDP packets based on application layer protocol session information and can be used for intranets, extranets and internets. CBAC can be configured to permit specified TCP and UDP traffic through a firewall only when the connection is initiated from within the network needing protection.
CBAC can inspect traffic for sessions that originate from either side of the firewall. This is the basic function of a stateful inspection firewall. Read more…
Because it is part of Cisco IOS software, NetFlow enables networks to perform IP traffic flow analysis without deploying external probes, making traffic analysis economical even on large IP networks. Read more…
Jeremy Cioara has, for many years, encouraged countless hundreds of thousands of would-be Cisco engineers through his skillful training and fabulous Cisco expertise.
In his spare time, he runs a blog “ciscoblog.com” which gets in excess of 600,000 unique visitors per month. Jeremy’s blog is mainly devoted to Cisco and provides valuable and harmless (quite the opposite) marketing for Cisco.
This is how Cisco thanks him:
A base Access List for any internet facing router, re-produced from Mike Storm and Jeremy Cioara’s blogs:
This quick lab demonstrates how CBAC is configured and applied to interfaces.
Try this quick and simple practice lab, where a secure IPsec tunnel is configured between two routers. Use debug to see ISAKMP and IPsec working.
Here is a basic overview of MPLS describing:
