Re: PMTU issues due to TOS field manipulation (for DSCP)

[Nivedita Singhvi <niv@xxxxxxxxxx>]

Andi Kleen wrote:

> I don't think the network users will be very happy if you require changing all
> end hosts this way. How about the following hack? For DF=1 packets
> the ipid field is useless. When you rewrite the TOS to DSCP save
> the old TOS in the ipid field.  When you see an ICMP fragment required
> message with the right DSCP on the router restore the old TOS from the ipid 
> field.
Wouldnt this require changes at the both ends, router and
host? How would we sync?

thanks,
Nivedita