Have you tried lowering the MTU to 576?

http://www.dslreports.com/tweaks/MTU



Mark Zyniecki wrote:
> Well, Matt, I do live in BFE if that's what you call living half way
> between Flagstaff and Williams. The only options are dialup or
> satellite.
>
> ADDITIONAL INFO:
> The WinXP modem init string is: AT &F E0 &C1 &D2 V1 S0=0\V1
>
> In openSUSE11 the connection is made via KInternet. (I'm using KDE 3.5
> w/ openSUSE11.)
> pppd uses wvdial.
> The default baud rate in wvdial was changed from 57600 to 115200.
> McAfee Speedometer test for download of 150Kb file had a drop in time
> from 171 seconds to 161 seconds with higher baud.
>
> The SUSE modem init string is: AT Q0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
>
> FROM /etc/ppp/options:
> # Set the MRU [Maximum Receive Unit] value to <n> for negotiation.  pppd
> # will ask the peer to send packets of no more than <n> bytes. The
> # minimum MRU value is 128.  The default MRU value is 1500.  A value of
> # 296 is recommended for slow links (40 bytes for TCP/IP header + 256
> # bytes of data). The value 1492 is for DSL connections (PPP Default -
> # PPPoE Header: 1500 - 8 = 1492)
> # mru 1492
>
> # Set the MTU [Maximum Transmit Unit] value to <n>. Unless the peer
> # requests a smaller value via MRU negotiation, pppd will request that
> # the kernel networking code send data packets of no more than n bytes
> # through the PPP network interface. The value 1492 is for DSL connections
> # (PPP Default - PPPoE Header: 1500 - 8 = 1492)
> # mtu 1492
>
>
> FROM /etc/ppp/options.pptp:
> #
> # We want a sane mtu/mru
> #
> mtu 1000
> mru 1000
>
> I think that's everything that was asked for, but let me know if I
> forgot something.
> Should I make changes to mtu and mru in options.pptp?
> Also, if it would help, I can post modem logs for each system.
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