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Bonding ISDN in linux (Redhat 6.0 ,6.1)

I've been trying for ages to get my ISDN bonded when I dial into my isp which just happens to be the company I work at. I've look everywhere for MPP protocol for linux but I can't seem to find it. Could somebody please help me with setting this up so I can bond my modem (3com Impact IQ) . Thanks a bunches.
1 Solution
SmileyqAuthor Commented:
Adjusted points to 200
SmileyqAuthor Commented:
Adjusted points to 250
SmileyqAuthor Commented:
I take it nobody knows how to do this either? Nobody is answering me.
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click setup at the console prompt and from there yu can find the settigs check it and follow the instructions
SmileyqAuthor Commented:
I'm needing to do this in linux where there is not software. I don't even use this modem anymore but I would still like to know the answer. I went out and bought a Cisco 762 instead (router) and I'm not using it with a switch but it never hurts to know. Thanks.
I have used a 3Com impact IQ with Linux with absolutely no problem - But I am only using a single channel not MPP.

I just configured PPP for a standard modem and it worked with no problems at all.
Hey, CJ, got rid of that pesky ISDN line, did you?

Well, first I will refer you to a link that will answer your questions:


You mainly want the FAQ, but there are other usefuls downloads and such their too.  If you want to do ISDN and MPPP, that FAQ is the holy grail for which you have searched.

I will also note a few things:

First, be sure to compile MPPP support into your kernel. The FAQ mentions this but a lot of people seem to miss that rather obvious step.

Where the docs say to use:


That "0" actually needs to match your network device so if your ISDN is not the first network device it should be 1 or 2 or....

If you have difficulty you might check to see these ippp options are set up:

/dev/ippp0 /dev/ippp1

Use this command to add the link:

Check the output of 'isdnctrl list ippp0' and see that the ippp1 is listed in the last two lines as the slave for ippp0.

Does your remote host support Channel Bundling?

Once you set that up you may discover that when the 2nd channel is in use you get messages in the log file about  stale packets and stepping over missing frames but it should work.

The probable reason you did not come across this information yourself is that most of the MPPP docs out there are in German.

J Crouchet
SmileyqAuthor Commented:
I'm accepting this answer on the fact that I'm a nice guy. The funny thing is that I don't even need it anymore but I did test this and it does work. I went the better life now. I got me a cisco router and a switch along with that and life could never be better. I really appreciate everybody's help in here. Good job.

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