nanog mailing list archives
Re: PMTUD for IPv4 Multicast - How?
From: Masataka Ohta <mohta () necom830 hpcl titech ac jp>
Date: Tue, 01 Sep 2015 09:49:47 +0900
William Herrin wrote:
for routers, generating ICMP PTB is as burdensome as generating fragments?No, it isn't.
Yes, it is. Generating an ICMP PTB @aclet is as burdensome as fragmenting a packet.
When a router fragments a packet, it has to fragment the next and the next and the next. Maybe tens or hundreds of thousands of packets before the end of that one user's session.
Not necessarily, because transport layer can react against fragmented packets.
When a router generates a PTB, there is no next. PTB is a soft failure. The origin must correct the error (by reducing packet size)
What if, the origin does not reduce packet size? Masataka Ohta
Current thread:
- Re: PMTUD for IPv4 Multicast - How?, (continued)
- Re: PMTUD for IPv4 Multicast - How? Chris Marget (Aug 31)
- Re: PMTUD for IPv4 Multicast - How? sthaug (Aug 31)
- Re: PMTUD for IPv4 Multicast - How? William Herrin (Aug 31)
- Re: PMTUD for IPv4 Multicast - How? Masataka Ohta (Aug 31)
- Re: PMTUD for IPv4 Multicast - How? Chris Marget (Aug 31)
- Re: PMTUD for IPv4 Multicast - How? Chris Marget (Aug 31)
- Re: PMTUD for IPv4 Multicast - How? Masataka Ohta (Aug 31)
- Re: PMTUD for IPv4 Multicast - How? Chris Marget (Aug 31)
- Re: PMTUD for IPv4 Multicast - How? Masataka Ohta (Aug 31)
- Re: PMTUD for IPv4 Multicast - How? Chris Marget (Aug 31)
- Re: PMTUD for IPv4 Multicast - How? William Herrin (Aug 31)
- Re: PMTUD for IPv4 Multicast - How? Masataka Ohta (Aug 31)
- Re: PMTUD for IPv4 Multicast - How? Mark Andrews (Aug 31)
- Re: PMTUD for IPv4 Multicast - How? Masataka Ohta (Aug 31)