Subject: Re: your mail
To: Jonathan Stone <email@example.com>
From: Dave Huang <firstname.lastname@example.org>
Date: 07/17/1996 17:47:04
On Wed, 17 Jul 1996, Jonathan Stone wrote:
> Bring the PPP connection up again. Retry whatever-it-is that's
Nothing's actually _failing_, it's just a performance issue... I can get
around 7.5K/s on incoming ftps, but only 4.9K/s on outgoing ftps.
> PPP includes a link-level checksum. Watch the packet counts in the
> netstat -I ppp? output over time. Check carefully Check carefully to
> see whether the PPP driver is recording input errors (frames whose CRC
> failed.) Frames with bad checksums are counted in Ierr field. A
> non-zero count indicates _something_, possibly overruns, is in fact
> garbling your PPP traffic. If the packets are being discarded due to
> errors at the PPP level, they'll never even get as far as IP.
No Ierrs or Oerrs at all on my machine, and I don't have access to the
terminal server at the other end of my PPP link, so I can't tell whether
it got any errors.
> Also, use netstat (or an SNMP daemon and monitor, if you prefer)
> to watch the rate of change of bad packets at the IP and TCP level.
> I run "netstat -p ip" "netstat -p tcp". One has to manually compute
> the rate of change; netstat's -i option means something different
> to, say, vmstat's. (Adding periodic sampling and rate-of-change
> to netstat would be a Cool Project.)
I'll take a look at netstat -p ip later (not running NetBSD right now),
but I did look at netstat -p tcp, and the only thing that seemed unusual
was a large number of data packets retransmitted.
> What OS is your FTP peer (ghostwheel) running? Is it a pre-2.0.0
> Linux? If so, have you tried turning off rfc1323 on your NetBSD
ghostwheel is running BSD/386 1.1, and is on an ethernet with the
terminal server I get my PPP connection from. I don't have a PPP
connection directly between my machine and ghostwheel, so it's hard for
me to tell exactly what it's not liking about my packets :)
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