PMTUD for IPv4 Multicast - How?

Tue Sep 1 01:21:23 UTC 2015

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