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Tunnel MTU vs. FastEthernet MTU

Hello,

We've been trying to fix some fragmentation issues with our VPN clients. I have GRE Tunnels Setup. I've set the MTU on the Tunnel Interface to 1420, the MTU on the Tunnel Source FastEthernet Interface is not set.

When displaying the Tunnel Interface it shows the MTU as 1514.

Do I need to set the MTU on the FastEthernet Interface as well?

Does that mean ALL the Tunnels need to have the same MTU?

Thanks

Anthony Davison

1 REPLY
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Re: Tunnel MTU vs. FastEthernet MTU

Hi there,

I am just wondering how you are displaying the MTU stats. are you using "sh int" or "sh ip int" command to check the stats?

Jazib

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