nanog mailing list archives
Re: Ping flooding
From: Vern Paxson <vern () ee lbl gov>
Date: Thu, 11 Jul 96 22:01:24 PDT
Really, consider a link where the path carrying most of the data has a time of N and the path carrying the ack has a path 2N or N + 1/2N You are computing an average which seems like it could be skewed based on the path the ack takes.
This doesn't matter. The key notions for TCP are (1) what's the time scale for feedback, and (2) what's the pipe size (= bandwidth-delay product). Both of these are determined by the RTT and not the one-way prop time.
Does anyone know of any papers on the effect of asymetric paths on TCP performance?
Well, I thought about this quite a bit for my end-to-end routing study (ftp://ftp.ee.lbl.gov/papers/routing.SIGCOMM.ps.Z). I really wanted to come up with some reason why asymmetric routing has serious implications for TCP performance, but wasn't able to. I guess this is a good thing, since 50% of the paths in my study were asymmetric in terms of visiting at least one different city in the two directions. 30% visited at least one different AS. Vern - - - - - - - - - - - - - - - - -
Current thread:
- Re: Ping flooding, (continued)
- Re: Ping flooding Brett D. Watson (Jul 10)
- Re: Ping flooding Vadim Antonov (Jul 11)
- Re: Ping flooding Alan Hannan (Jul 11)
- Re: Ping flooding Per Gregers Bilse (Jul 11)
- Routing flaps, was Re: Ping flooding Forrest W. Christian (Jul 12)
- Re: Ping flooding Alan Hannan (Jul 11)
- Re: Ping flooding Bradley J. Passwaters (Jul 11)
- Re: Ping flooding Paul Ferguson (Jul 11)
- Re: Ping flooding Alan Hannan (Jul 11)
- Re: Ping flooding Jerry Anderson (Jul 12)
- Re: Ping flooding Vadim Antonov (Jul 11)
- Re: Ping flooding Vern Paxson (Jul 11)
- Re: Ping flooding Jeffrey Burgan (Jul 12)
- Re: Ping flooding Vern Paxson (Jul 12)
- Re: Ping flooding Vadim Antonov (Jul 12)