Cisco includes ip and icmp header size in the total specified packet size. Payload in the case is 1510-20-8 = 1482 bytes. Juniper adds icmp and ip header to the payload size you specify. So 1510 becomes 1538 bytes of ip packet.

Thanks,
Nilesh




On Mar 16, 2009, at 11:22 AM, "Flavio Schappo" <fscha...@gmail.com> wrote:

Hi

Anybody have some explanation doc about MTU diferences between JUNIPER and
CISCO?

I think that I´m hitting some MTU issues where I have 2 ciscos worki ng ping with more them 1510 bytes and 2 Juniper or 1 juniper and 1 cisco are not
working.

Regards

Flavio
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