newbie has problems w/ dialup

[Patrick Jacques]

Those recomendations are valid for broadband, but this is analog dialup, 
so anything over 576 is gonna cause delays.  Windows is defaulting to an 
MTU of 576, which is why it's working better right now.  You don't want 
the biggest packet possible when your bandwidth is limited, it's like a 
freeway @ rush hour with too many cars on the road, it just gets slower.



Bob Elzer wrote:
> 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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