Bug 6993 - Problems with VJ compression with PPP
Problems with VJ compression with PPP
Product: Red Hat Linux
Classification: Retired
Component: ppp (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Nalin Dahyabhai
Depends On:
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Reported: 1999-11-13 17:57 EST by Tom Cross
Modified: 2008-05-01 11:37 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2003-01-24 18:31:23 EST
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Description Tom Cross 1999-11-13 17:57:08 EST
I have a RedHat 6.1 box with Dual Pentium-Pro processors.  The RH6.1
install correctly identified this and I'm currently using 2-2.12-20smp for

When I try to connect via PPP to the internet, I get the following in
Nov 13 14:59:15 hal diald[1121]: Running pppd (pid = 1197).
Nov 13 14:59:15 hal modprobe: can't locate module char-major-108
Nov 13 14:59:15 hal pppd[1197]: pppd 2.3.10 started by root, uid 0
Nov 13 14:59:15 hal pppd[1197]: Using interface ppp0
Nov 13 14:59:15 hal pppd[1197]: Connect: ppp0 <--> /dev/ttyS0
Nov 13 14:59:21 hal pppd[1197]: Remote message: Login Succeeded
Nov 13 14:59:48 hal pppd[1197]: Connection terminated.
Nov 13 14:59:48 hal pppd[1197]: Exit.

I enabled debug for pppd and found this:

Nov 13 16:32:09 hal pppd[752]: rcvd [PAP AuthAck id=0x2 "Login Succeeded"]
Nov 13 16:32:09 hal pppd[752]: Remote message: Login Succeeded
Nov 13 16:32:09 hal pppd[752]: rcvd [IPCP ConfReq id=0x1 <compress VJ 0f00>
Nov 13 16:32:12 hal pppd[752]: rcvd [IPCP ConfReq id=0x2 <compress VJ 0f00>
Nov 13 16:32:15 hal pppd[752]: rcvd [IPCP ConfReq id=0x3 <compress VJ 0f00>
Nov 13 16:32:18 hal pppd[752]: rcvd [IPCP ConfReq id=0x4 <compress VJ 0f00>
Nov 13 16:32:22 hal pppd[752]: rcvd [IPCP ConfReq id=0x5 <compress VJ 0f00>

It LOOKS like it can't to VJ header compression.  I thought it might have
been a mis-compiled kernel so I recompiled make sure PPP was checked as a
module (it was).  My new kernel still did not work.

I will try this with a UP and post the results.

Is there a known problem with PPP/SMP/VJ?
Comment 1 Tom Cross 1999-11-15 12:23:59 EST
I tried the Uniprocessor kernel that the installer installed for me and I had
exactly the same results with PPP and VJ.
Comment 2 Michael K. Johnson 1999-11-19 16:38:59 EST
No, it can certainly do vj compression.

Can you give me the output of
rpm -q ppp initscripts

Comment 3 Tom Cross 1999-11-19 16:51:59 EST
[tomc@hal tomc]$ rpm -q ppp initscripts

I forgot to mention that I have basically done a rpm -UvhF *.rpm from the 6.1
updates directory.
Comment 4 Nalin Dahyabhai 2000-02-29 09:24:59 EST
Others have reported that adding "novj" to their /etc/ppp/options file improves
things for them.  This is too rare an occurrence to be sure it's a bug in the
Linux ppp driver -- what kind of system is on the other end of the line?
Comment 5 Stephen John Smoogen 2003-01-24 18:31:23 EST
Bug 6993 is being closed because bug was needing info since 2000, and neither
original bug reporter or others added any information. 

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