Archive for February, 2013

Reflexive Access Lists

Written by admin. Posted in ACLs

Reflexive ACL

This article describes what Reflexive Access Lists are, how they work, and how to configure Reflexive ACLs on Cisco routers in GNS3. Reflexive Access Lists are used to allow IP traffic for sessions that originates from inside the network, and deny IP traffic that originates from outside the network.


Dynamic (Lock-and-key) Access List configuration

Written by admin. Posted in ACLs

Dynamic (Lock-and-key) Access Control Lists are used to block user traffic until the user telnet to the router. Dynamic Access List is based on Extended ACL which starts with an entry that blocks traffic through the router. When the user try to telnet to the router a dynamic entry is added


Extended Access Lists example

Written by admin. Posted in ACLs

Extended ACLs

Extended Access lists give us extra features in comparison with standard ACLs. They check packet for source address, destination address, protocol and port number. Like Standard ACLs, Extended Access Lists can be numbered or named. Ranges used by numbered extended ACLs are from 100 to 199 and from 2000 to 2699.