08-25-2009 10:28 AM - edited 02-21-2020 03:38 AM
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?
08-28-2009 06:36 AM
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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