max mtu modem init string (USR5686E)

October 24, 2010 at 13:38:23
Specs: Linux i686 Mint9, Intel w/ 2GB
Here's a question that requires a hardcore modem geek :-)

I have a USR5686E external on an old copper dialup line that gives me 28.8Kbps at best. Running Linux Mint 9, and having to use GnomePPP. It works, but upon dialup, the modem log reports MaxMTU at 1524 no matter what I do. I've tried modifying /etc/PPP/options to try to pass a value (MTU 576) to the modem, but it doesn't do it.
Is there any way I can add something to the init string in the GnomePPP setup screen that will do it?

See More: max mtu modem init string (USR5686E)

October 25, 2010 at 13:01:20

3.1 Configuration

Suppose the modem is connected to COM2, the local IP address is `Loc_Ip' and the remote IP address is `Rem_Ip'. We want to use 576 as our MTU. The /etc/ppp/options.ttyS1 would now be:

mru 576
mtu 576

If this is correct and still wrong there might be another config file for the gnomeppp app.

Why did it take me over a year to phone in a problem to ATT?

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October 27, 2010 at 11:52:40
I think there is another config file for GnomePPP somewhere, but I'll be dipped if I can find it.
One of the downsides to linux-- the l-o-n-g learning curve.
Thanks for the help.

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