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IP MTU query

saqibmehmood
Level 1
Level 1

Hi everyone,

I wanted to ask that when mtu is set to 1400 in GRE path then maximum data size packet allowed is 1376(1400-24).Shouldnt it be 1348(1440-24(gre)-20(IP)-8(icmp)).

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Joseph W. Doherty
Hall of Fame
Hall of Fame

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Maximum packet size would be 1400 before GRE encapsulation and 1424 with GRE encapsulation.

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