Nilesh is right I think , in juniper you specify only payload size ,
in cisco you specify full frame size (ip header+icmp header+Payload)
servet
----- Original Message -----
From: "Ahmed Abdelghany" <aaeg...@yahoo.com>
To: "Nilesh Khambal" <nkham...@juniper.net>; "Flavio Schappo"
<fscha...@gmail.com>
Cc: <juniper-nsp@puck.nether.net>
Sent: Tuesday, March 17, 2009 1:39 PM
Subject: Re: [j-nsp] MTU issues.
I think it is inversed, cisco add the IP headers to the size you specified,
and juniper include the IP header in the size you specified.
the problem appears when the packet arrives juniper interface with packet
size larger than the interface MTU, which will drop the packet, while if
this happened with cisco interface, it will fragment the packet.
Juniper will fragment the packet when it arrives on interface with large MTU
and leaves on interface with MTU smaler than the packet size.
thanks
Abdelghany
________________________________
From: Nilesh Khambal <nkham...@juniper.net>
To: Flavio Schappo <fscha...@gmail.com>
Cc: juniper-nsp@puck.nether.net
Sent: Monday, March 16, 2009 8:27:55 PM
Subject: Re: [j-nsp] MTU issues.
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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