On Mon, 6 Sep 1999, John Krivitsky wrote:
> We are seeing a peculiar problem in which downloading via the ppp
> connection is perfect, but uploading is extremely slow. The set-up is an
> ordinary 56K modem to an ISP. ASYNCMAP is zero, hardware flow control
> has been checked (software flow control has also been tried) and the
> serial card is a newer one. ifconfig ppp0 reports very few packets
> dropped. This problem is consistent across several ISPs.
>
> The one thing that did seem to speed it up significantly (though not to
> full link capacity) was changing the port speed from 115200 to 57600. My
> understanding is that it is good to drive the port speed a fair bit
> higher than the modem connect speed so as to allow modem
> compression/decompression for compressible files (which is quite often
> the sort we have - large base64-encoded e-mail attachments).
>
> Does anybody have any experience with this or can point me in the right
> direction?
I had something similar when I first started using ppp. The problem
was that my ISP was negotiating an mru of 1524, and therefore pppd set
the mtu to 1524, but there was a router somewhere along the line that
didn't like that too much. Try setting the mtu to 1500 in the config
file; if that doesn't work, try 576.
-Scott Berg
--
J. Scott Berg [EMAIL PROTECTED]
3025 E. Amy Ln. (812) 339-8368
Bloomington, IN 47408-4220
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