cisco router encryption question

Posted on 2003-03-16
Medium Priority
Last Modified: 2010-05-18
using cisco routers, such as the 2500 series and other high end routers. what encryption protocols do they offer when communicating with each other over a network?

for example when they route tcp/ip data, or they update their routing tables. is there a way to encrypt that data? if so how.

also. is there a way to encrypt ALL data that the router sends. i assume this will cause performance loss but i'm still curious to know if any to all protocols can be encrypted in some shape way or form.
Question by:nonsence
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Accepted Solution

lrmoore earned 225 total points
ID: 8147855
Sure. Several ways to encrypt. Using GRE tunnels (not really encryption, but encapsulating other protocols within TCP/IP
Using IPSEC, you can create permanent tunnels that encrypt all traffic, or just select traffic, up to 3DES, and now AES standards.
It all depends on the feature set that you have in the router IOS, the memory in the router, and whether or not you have a hardware accelerator for IPSEC.

IPSEC VPN's can be created router-to-router, router-to-firewall, client-to-router, firewall-to-firewall, almost any combination you can think of, using standards-based IPSEC.

The exact "how" depends on what is at the other end decrypting the data, and what standards it supports. Two/three or more Cisco routers, piece of cake with IPSEC tunnel - example:

Author Comment

ID: 8147962
ok thanks for the links. i shall be doing more reading now :-D

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