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MTU Sze Issue on atm0, atm0.1 and Dialer1 Interface

Posted on 2009-05-19
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Last Modified: 2012-08-13
HI Team,
Can soem one pelase assist me in an MTU Issue i am having.
I have configured and Cisco ROuter and that conencts to Internet OK , VPNs are working OK, perfactly fine except Microsoft websites do lot load.
Thinking it it the MTU issue, I have decreased teh MTU Size on Dialer1 Interface to 1356 but Issue has not been resolved.

I have also Noticed 3 Different MTU SIzes configured on the below interfaces.

MTU on ATM0: 1500 Bytes
MTU ATM0.1: 1500 Mytes
MTU on Dialer1: 1356 Bytes

Can you please tel me which MTU size should be chnaged OR Which MTU Size is Important.
ROuter is Cisco 837 and had atm0 Interface and atm0.1 was created and Dialer1 is Interfaces configured with ISP dettings.

As i stated Every thing else works perfact except Microsoft website and www.ninemsn.com.au websites.

Thanks Heaps for Urgent assistance.

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Question by:tariqmansoor
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Accepted Solution

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ludo_friend earned 500 total points
ID: 24428414
for the purposes of this exercise, dialer1 is the only one there that really matters...

try adding
ip tcp adjust-mss 536
to dialer 1
if this makes them work then you can wind the mss back up to 1316 (536 is the minimum mss)

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Author Comment

by:tariqmansoor
ID: 24428779
That Certaily Did ...:: worked.
I added that command to LAN interface instead of Dialer1 and that worked

Thanks for that, Just wondering why setting the same MTU ( 1372 per say)  size on Dialer 1 did not worked and setting it via teh above command worked.

Thanks,
0
 

Author Closing Comment

by:tariqmansoor
ID: 31583341
Thanks,
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