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Cisco ASA and PMTU-D packets issue!

sfanayei
Level 1
Level 1

Hi ALL

It is ASA 5555 in my network that is being used as vpn gateway for remote access. It is configured with SSL vpn for remote users. The issue is the users can not browse to some sites using http/https but not all sites ofcorse. I gets this syslog message: PMTU-D packet 1400 grater than effective mtu 1210, dest. xxxx, source xxxx.

Has any one som suggesions for solve the problems. Many tanks in advance!

4 Replies 4

Jeff Van Houten
Level 5
Level 5

Have you tried lowering the mtu on the Asa to 1200?

Sent from Cisco Technical Support iPad App

Hi

I thought about it, but this may will have impact for connection speed between end devices. Is there ther way to solve this type of problemes?

No it won't. Adjust the mtu and you'll never know the difference.

Sent from Cisco Technical Support iPad App

ok, Tanks. I will try to reduce the mtu to see if it can solve the problem.