nanog mailing list archives
Re: OMB: IPv6 by June 2008
From: David Andersen <dga+ () cs cmu edu>
Date: Tue, 12 Jul 2005 21:35:37 -0400
On Jul 12, 2005, at 1:52 PM, Phillip Vandry wrote:
How are people making the case for IPv6 with popular applications like voice? With G.711 and 20ms voice samples, with IPv4 you get: 20 bytes IP + 8 bytes UDP + 12 bytes RTP + 160 bytes payload 20% overhead. 40 bytes IP + 32 bytes shim6 8 bytes UDP + 12 bytes RTP + 160 bytes payload 36.5% overheadAlmost twice as much overhead is a much tougher pill to swallow. I wouldtry to stay with IPv4 as long as I could. Even without adding shim6 into the picture you're taking a significant penalty.
Even standard IP headers are a pretty high overhead for VoIP, particularly if you're doing very high compression to try to get the samples to squeeze into a low bandwidth channel. Enter IP header compression, which is shockingly effective at compressing IP headers of all sorts... if you've dedicated 128 bits for the address, and it's still just as static as it was in IPv4, it'll compress to just the same amount. This is an easy technical problem to solve.
-Dave
Current thread:
- Re: OMB: IPv6 by June 2008 (OT reminder), (continued)
- Re: OMB: IPv6 by June 2008 (OT reminder) John Curran (Jul 08)
- Re: OMB: IPv6 by June 2008 Rich Emmings (Jul 11)
- Re: OMB: IPv6 by June 2008 Hank Nussbacher (Jul 11)
- Re: OMB: IPv6 by June 2008 bmanning (Jul 11)
- Re: OMB: IPv6 by June 2008 william(at)elan.net (Jul 11)
- Re: OMB: IPv6 by June 2008 Hank Nussbacher (Jul 12)
- Re: OMB: IPv6 by June 2008 Jay R. Ashworth (Jul 12)
- Re: OMB: IPv6 by June 2008 Phillip Vandry (Jul 12)
- Re: OMB: IPv6 by June 2008 Iljitsch van Beijnum (Jul 12)
- Re: OMB: IPv6 by June 2008 Randy Bush (Jul 12)
- Re: OMB: IPv6 by June 2008 David Andersen (Jul 12)
- Re: OMB: IPv6 by June 2008 Phillip Vandry (Jul 12)
- Re: OMB: IPv6 by June 2008 Bill Stewart (Jul 12)
- Comment - Re: OMB: IPv6 by June 2008 Joseph T. Klein (Jul 12)
- Re: Comment - Re: OMB: IPv6 by June 2008 Todd Vierling (Jul 13)
- Re: OMB: IPv6 by June 2008 Robert E . Seastrom (Jul 07)
- Re: OMB: IPv6 by June 2008 Scott McGrath (Jul 07)
- Re: OMB: IPv6 by June 2008 Jeroen Massar (Jul 07)
- Re: OMB: IPv6 by June 2008 Andre Oppermann (Jul 07)
- Re: OMB: IPv6 by June 2008 Jeroen Massar (Jul 07)
- Re: OMB: IPv6 by June 2008 Randy Bush (Jul 07)