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SubjectRe: [2.2.{12,13p15}] PPP uploads fizzle out and die (tcpdump info incl.)
On Wed, 6 Oct 1999, Steve Dodd wrote:

> I'm stuck. FTP downloads over my PPP link are fine, they pretty much
> saturate the connection when the remote host can send that
> fast. Uploads are a different matter: regardless of the remote host
> I'm uploading to, the xfer rate withers away to sod-all and a huge
> gob of data remains resolutely stuck in the send-Q.

I've seen this before, long ago. I fixed the problem by specifying an
mtu of 1500. What happened was that my ISP specified <mru 1524> in
the initial negotiation, indicating that I could set my mtu to that;
pppd did so, but the 1524 size packets were being dropped by a router
somewhere (at least that's what I surmised, and had some minimal
evidence to back that up).

Your mtu appears to be at 1500 already; try setting it to 576 (I think
this is the magic "always works" number) and see if that fixes the
problem.

-Scott Berg

(I read linux-kernel-digest and linux-ppp, so cc is unnecessary)

--
J. Scott Berg jsberg@earthlink.net
75 ROCKY POINT YAPHANK RD APT 122 (516) 209-0693
ROCKY POINT NY 11778-8470


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