newbie has problems w/ dialup

[Bob Elzer]

I would try setting mru and mtu  to 1492, as long as your phone connection
is good, you want the biggest packet possible.

You can even try 1500, but that might cause a little degradation.

1492, should improve your situation, but I'm not sure how much.

The differences in the init string I see, are E1 and E0, but I think that's
just echo string cmd.
and Q0  I'm not sure what that is, find out and maybe remove it.

What we need to figure out is where the slowdown is happening, The modem
because of different settings, ppp for the same, or is the operating system
causing it.

If we can get the modem, to have the exact same settings in both cases, then
we can rule that out.

Then getting the same settings for ppp.

 

-----Original Message-----
From: plug-discuss-bounces at lists.plug.phoenix.az.us
[mailto:plug-discuss-bounces at lists.plug.phoenix.az.us] On Behalf Of Mark
Zyniecki
Sent: Thursday, December 18, 2008 12:08 AM
To: Main PLUG discussion list
Subject: Re: newbie has problems w/ dialup

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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