I am working mostly with Cisco 2600 routers and was considering using ACLs
to add more security. The network I administer has a firewall behind an
access router connected to the Internet. I am thinking about ACLs such as:
Allowing ICMP only from subnets our few other locations are on (so I can
troubleshoot between offices)
Same for Telnet access to VTY.
Does anybody have suggestions for or against this? I know adding ACLs will
increase the load on the routers but when will performance suffer
significantly? Currently the processor averages about 15%.
Any other suggestions or resources for tightening security would be
appreciated.
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