[j-nsp] GRE packet fragmentation on j-series

[Alex Arseniev]

My understanding is that GRE fragmentation should occur if egress interface 
MTU is < GRE pkt size.
For GRE reassembly, you need IDP policy, this means high memory SRX model. 
IDP license is not needed.
Rgds
Alex

----- Original Message ----- 
From: "Lukasz Martyniak" <lmartyniak at man.szczecin.pl>
To: <juniper-nsp at puck.nether.net>
Sent: Tuesday, January 24, 2012 2:04 PM
Subject: [j-nsp] GRE packet fragmentation on j-series


> Hi all
>
> I have some problem with gre tunnels. I need to fragment packages in 
> tunnel. I run gre between two jseries (junos 10.4R6) and lunch MPLS on it. 
> The problem looks like that packages with MTU above 1476 are not 
> fragmented/reassembled and are dropped.
>
>
> interfaces gr-0/0/0
> unit 10 {
>    clear-dont-fragment-bit;
>    description "Tulne to r1-lab";
>    tunnel {
>        source 10.200.0.1;
>        destination 10.200.0.2;
>        allow-fragmentation;
>        path-mtu-discovery;
>    }
>    family inet {
>        mtu 1500;
>        address 100.100.100.1/30;
>    }
>    family mpls {
>    }
> }
>
> Have someone have similar problem ? is there a simple way to fix this ?
>
> Best Lukasz
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