Re: PMTUD for IPv4 Multicast - How?

[Masataka Ohta <mohta () necom830 hpcl titech ac jp>]

Mark Andrews wrote:

> > Yes, it is. Generating an ICMP PTB is as burdensome as
> > fragmenting a packet.
>
> Well it could be done at wire speed.

Both of them could be.

> There is no theoretical reason
> why it has to be more burdensome than forwarding a packet.

That's not my point.

> The communiction fails.

It depends on layer 4 and above.

> Additionally routers normally rate limit
> PTB generation thereby reducing cpu loads to a acceptable level
> which is the whole point of moving the fragmentation to the originating
> node.

Routers can rate limit fragment generation, too.

                                                        Masataka Ohta