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PMTUD for IPv4 Multicast - How?
- Subject: PMTUD for IPv4 Multicast - How?
- From: mohta at necom830.hpcl.titech.ac.jp (Masataka Ohta)
- Date: Tue, 01 Sep 2015 10:21:23 +0900
- In-reply-to: <[email protected]>
- References: <CAAG5dDCZdbYwnoQUuoaxSdevDTAkwyYGtpNfnVWUWWSZzGPMOg@mail.gmail.com> <[email protected]> <CAAG5dDD+oNOEK0b57j8EnVNrZ09oEHzFy9ruATyAzfeDs=furw@mail.gmail.com> <[email protected]> <CAP-guGUPN2vDdFC1qwkD2FOBQKYjWWRd=07ywpkCz28h_GJ3Bw@mail.gmail.com> <[email protected]> <[email protected]>
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