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SubjectRe: PPP bug
On Sun, 7 Feb 1999, Joseph W. Breu wrote:

> 7On Mon, 1 Feb 1999, Alan Cox wrote:
> > The sequence in question is "+++". Either your modem is misconfigured (you've
> > got no guard bands set) or faulty. You should refer to your manuals and possibly
> > the modem vendor.
> I have the guard set and I see this also. I have a USR 56k
> external with pppd 2.3pl4 and linux 2.0.36. If I read a patch file with
> pine, or try to cat a file that has the +++ in it, my connection will hang
> (i can ^] the telnet session and start another with no ill affect).
> -Joseph W. Breu

I am connected to my Linux server via a 56kb modem with PPP. I can
send ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++ All day long with no affect.

Script started on Sun Feb 7 22:01:19 1999
groveland:/root # traceroute chaos
traceroute to (, 30 hops max, 40 byte packets
1 ( 0.277 ms 0.198 ms 0.186 ms
2 ( 195.234 ms 199.413 ms 189.936 ms
3 ( 179.913 ms 179.419 ms 169.938 ms
groveland:/root # exit
Script done on Sun Feb 7 22:01:37 1999

skunkworks -> quark == PPP

The +++ sequence in a packet can't affect the modem because you
need at least 500ms (lowest you can set it) of quiet after the sequence to
change its mode. The data strings will never be the last thing sent, so
you can't get 500ms between characters no matter how hard you try.

That said, please do `ps` and see if whatever you used to start your
PPP link (chat or whatever) is still running. If it is, it might still
have your ttyS?? channel open and be echoing something that could
screw things up.

Dick Johnson
Penguin : Linux version 2.2.1 on an i686 machine (400.59 BogoMips).
Warning : It's hard to remain at the trailing edge of technology.
Wisdom : It's not a Y2K problem. It's a Y2Day problem.

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