nanog mailing list archives
Re: Questions about Internet Packet Losses
From: Vern Paxson <vern () ee lbl gov>
Date: Mon, 13 Jan 1997 21:17:57 PST
indicate that 9% of the packets had a 512 byte *payload*. I already subtracted off the 40 bytes for the headers. I meant MSS.
(By payload, I meant data, i.e., not including headers, same as you ...)
However, the spikes in the packet percentages are clearly due to hosts using that MSS. You would otherwise expect to see a "smooth" distribution across packet sizes, which is not at ALL what's happening.
Right, spikes correspond to MSS's (and other effects like acks & SYN/FIN's). Are you saying the data shows significant spikes at other, non-standard MSS values? If it does, then (modulo some thinking about the particular numbers) I agree that they're likely MSS candidates and support the notion that weird MSS's are being used. But if the data has a few spikes at things like 512 but no strong spikes at non-standard values, then that doesn't help distinguish between (1) lots of weird TCP's using weird MSS's, vs (2) lots of packets that are less than full-size because the mainstream TCP didn't have enough bytes to fill them. If your data is available, I'd love to take a gander at it. Vern - - - - - - - - - - - - - - - - -
Current thread:
- Re: Questions about Internet Packet Losses, (continued)
- Re: Questions about Internet Packet Losses Paul A Vixie (Jan 14)
- Re: Questions about Internet Packet Losses Perry E. Metzger (Jan 13)
- Re: Questions about Internet Packet Losses Nathan Stratton (Jan 13)
- Re: Questions about Internet Packet Losses Vadim Antonov (Jan 13)
- Re: Questions about Internet Packet Losses Tony Li (Jan 13)
- Re: Questions about Internet Packet Losses Michael Dillon (Jan 13)
- Re: Questions about Internet Packet Losses Vadim Antonov (Jan 13)
- Re: Questions about Internet Packet Losses Vern Paxson (Jan 13)
- Re: Questions about Internet Packet Losses Tony Li (Jan 13)
- 30%, huh? (Re: Questions about Internet Packet Losses ) Paul A Vixie (Jan 13)
- Re: Questions about Internet Packet Losses Tony Li (Jan 13)
- Re: Questions about Internet Packet Losses Vern Paxson (Jan 13)
- Re: Questions about Internet Packet Losses Tony Li (Jan 13)
- Re: Questions about Internet Packet Losses Howard C. Berkowitz (Jan 14)
- Re: Questions about Internet Packet Losses Tony Li (Jan 14)
- Re: Questions about Internet Packet Losses Tony Li (Jan 13)
- Re: Questions about Internet Packet Losses William Allen Simpson (Jan 13)
- Re: Questions about Internet Packet Losses Hank Nussbacher (Jan 13)
- Re: Questions about Internet Packet Losses Barry Shein (Jan 15)
- Re: Questions about Internet Packet Losses Craig Nordin (Jan 15)
- Re: Questions about Internet Packet Losses Vern Paxson (Jan 13)
- Re: Questions about Internet Packet Losses John Hawkinson (Jan 14)
- Re: Questions about Internet Packet Losses Vern Paxson (Jan 14)