nanog mailing list archives
Re: PMTUD for IPv4 Multicast - How?
From: William Herrin <bill () herrin us>
Date: Mon, 31 Aug 2015 17:38:14 -0400
On Mon, Aug 31, 2015 at 5:17 PM, Masataka Ohta <mohta () necom830 hpcl titech ac jp> wrote:
for routers, generating ICMP PTB is as burdensome as generating fragments?
No, it isn't. 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. 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) before communication can succeed. There are potentially several orders of magnitude of difference in the burden on the router. Regards, Bill Herrin -- William Herrin ................ herrin () dirtside com bill () herrin us Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>
Current thread:
- Re: PMTUD for IPv4 Multicast - How?, (continued)
- Re: PMTUD for IPv4 Multicast - How? Valdis . Kletnieks (Aug 31)
- 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? Valdis . Kletnieks (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)