vpn tunnel mode versus transport mode

Posted on 2014-03-15
Medium Priority
Last Modified: 2014-04-03
I am looking at a IPSec site-to-site VPN connection routers configuration and I see that one router has the transform set mode tunnel and the other side has transform set mode transport. Will this be a problem? The tunnel is up and running. But I am not sure if there are any errors in the background. Thanks
Question by:leblanc
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LVL 11

Accepted Solution

naderz earned 1332 total points
ID: 39931905
For a site-to-site tunnel you should be using the tunnel mode. I would make sure they match on both ends.

Author Comment

ID: 39932088
what if they don't match. What command can I use to see what mode they are using on both end. Thanks
LVL 17

Assisted Solution

lruiz52 earned 668 total points
ID: 39932095
Agree with naderz, both sides should be the same,

On router to router vpn you should use tunnel mode on both sides, check the link below for a good explanation of both modes and when to use;

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LVL 11

Assisted Solution

naderz earned 1332 total points
ID: 39933017
I am not sure what devices you are using. Here is the command for a Cisco device

show crypto ipsec sa

Here is another link that also explains the different modes and their intent:


Author Comment

ID: 39933171
We are all Cisco gear
LVL 11

Expert Comment

ID: 39935985
Try the command above and the links provided for more information.

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