Re: 2.2.0 breaks telnet to old SysV R3 machine

bwoodard@cisco.com
Tue, 02 Feb 1999 21:51:54 -0800


Amazing, I have been struggling with the fact that my ricochet
wireless modem wouldn't work with the 2.1 kernels for months. I never
could figure out why I could get UDP through but not TCP.

Can anyone explain why van jacombson compression doesn't work? Is it a
problem with pppd, the 2.2 kernel or the the other side? (the ricochet
and I guess the van jacobson compression by extension work with
2.0.36)

-ben

> > After upgrading to 2.2.0 I can't telnet/[rs]login to an old Motorola box
> > (VMEbus, SysV/68 R3) anymore. All other machines I have access to are fine.
> > But ping and ftp still work!
> > telnet: I do get `login:', but can't type in anything anymore. After
> > the timeout it says: Connection closed by foreign host. rlogin: rcmd:
> > wasp2.mpae.gwdg.de: Address already in use
>
> A friend of mine had a problem very similar to this: he was running the
> network over a ppp connection, UDP was working and TCP not.
>
> The problem was solved (?) by disabling Van Jacobson style TCP/IP
> header compression in ppp (add the option novj or maybe novjccomp when
> launching pppd). It looked like the remote host was requesting vj
> compression, that the local pppd was accepting it and then hanged.
>
> I don't know if it is a bug in the remote host, or in pppd.
>
> Éric Brunet
>
> Please read the FAQ at http://www.tux.org/lkml/

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