Re: AD comments on draft-ietf-rohc-hcoipsec-10

On May 18, 2009, at 15:21, Magnus Westerlund wrote:

> some consideration
> on what to do with it.

So what would you want the compressor to do?
Run PLPMTUD (probes can be done by occasionally compressing badly*) on
the tunnel and reject (ICMP unreachable/Frag needed) all DF/IPv6
packets that would not fit with worst-case expansion?
Probably safe, but somewhat expensive.

Gruesse, Carsten

*) Yes, this needs way more text.
You would need to compress badly whenever compressing a packet that,  
badly compressed, would not fit the currently established safe PMTU.   
That unfortunately tends to shrink while compressing well, which ROHC  
tends to do :-)