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

[Lukasz Martyniak]

Thanks for quick response, i had a hoped that this could be done in other whey. I think jseries need extra license for IDP. 

On Jan 24, 2012, at 11:35 PM, Alex Arseniev wrote:

> 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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>