Subject: RE: [nemo] Fragmentation at mobile router

From: "Vijay Devarapalli" <[email-masked]>
Date: Fri, 31 Mar 2006 10:40:25 -0800

> I have a question about fragmentation at mobile router.
> When mobile router receives a long packet from a node in the mobile
> network, should mobile router fragment this packet?

I would prefer the mobile router to tell the
MNN to reduce MTU.

> Of course, normally it is end node to manage fragmentation after
> receiving ICMP. However, if so, when the mobile network 
> moves, MTU size
> toward tunneling path may be changed and then end nodes in the mobile
> network receive ICMP packet too big.
> (e.g. when mobile router moves under another mobile router, 
> MTU size is
> changed.)
> It means that movement forses end node to retransmit the 
> packet. It goes
> against the rule of hiding movement from end node. 

receiving ICMP packet too is not the same as
the MNN being aware of the movement.

Vijay

> 
> 
> The problem in mobile router is the same in home agent.
> 
> 
> Thanks in advance.
> 
> ---
> Best Regards
> Takaaki Moriya
> <[email-masked]>
> 
> 
>