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Site to Site VPN MTU issue

I receive the following message repeatedly in the log for a cisco to cisco ios 12.4T vpn tunnel:

IPSEC(adjust_mtu): adjusting path mtu from 1500 to 1438

Should I be setting the MTU for this connection? Does this indicate a connectivity problem?

1 REPLY

Re: Site to Site VPN MTU issue

Please take a look at the doc below for ways to resolve issues related to fragmentation and MTU.

http://www.cisco.com/en/US/tech/tk827/tk369/technologies_white_paper09186a00800d6979.shtml#t6

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