A fragmentation Strategy for gre draft-bonica-intarea-gre-mtu-02


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A Fragmentation Strategy for GRE 

 

draft-bonica-intarea-gre-mtu-02 

Ron Bonica 

Carlos Pignataro 

 

IETF 87 - Berlin, Germany 



v1 
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Motivation 

 



Document deployed GRE Fragmentation Strategy 

Implementers are aware of BCP 



Users understand how implementations work 

 



Scope 



Point-to-point GRE Only 

Does not update [



RFC2784

 



 

 

 


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Default Fragmentation Strategy 

 



GRE Ingress do not fragment the delivery header: 

Received non-fragmentable big packet -> signal to the 



source 

Received fragmentable big packet -> fragment the inner 



packet 

On IPv4 delivery header, always DF=1 



Use when network does not block ICMPs, and 

payload and tunnel source support PMTUD. 

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Non-Default Fragmentation Strategy 

 



On IPv4 delivery header, copy DF from the inner 

packet 


Use when network blocks ICMPs 


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Review on list, looking forward to more WG 

feedback 

Request that Intarea WG adopts the 



document 

 

 



 

Documents Status 
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Thank You ! 

{Ron; Carlos} 




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