[pptp-server] 'sent [LCP ConfReq id=0x1...' followed by 'Modem hangup.'

[Maurice Tijs]

Hello there,

I'm (as almost everyone here) in the proces of setting up a vpn.
My setup is very simple actualy, I have a masquerading firewall that runs
pptpd. So there's no need for masquerading pptpd packets, as they are
destened for the firewall itself... (...I think, or am I wrong here?)
This firewall runs RedHat 7.1, the dev. version of PoPToP, and 2.4.0 of
pppd.

Oh yeah, the client is a Win98 laptop.

I followed the poptop tutorial, and I stopped at the line "your vpn should
now be working without encryption" to test this. That didn't work. So I
started fiddling with the configurations, in short: no luck.

At the client side I get the error 645. The FAQ said to update DUN, so I
tried. I downloaded many files from M$'s site, and they all refused to
install because they think my client's system isn't the right version... Are
the updates already installed or is the installer confused? I also tried
windowsupdate.microsoft.com, but that also didn't work (complained about
missing files or something, but I didn't feel like investigating this
problem first...)

When I take a look at my pptp.log I see:
Feb 16 11:11:30 localhost pppd[3313]: pppd 2.4.0 started by root, uid 0
Feb 16 11:11:30 localhost pppd[3313]: using channel 51
Feb 16 11:11:30 localhost pppd[3313]: Using interface ppp1
Feb 16 11:11:30 localhost pppd[3313]: Connect: ppp1 <--> /dev/pts/1
Feb 16 11:11:30 localhost pppd[3313]: sent [LCP ConfReq id=0x1 <asyncmap
0x0> <auth chap MD5> <magic 0xba557aa1> <pcomp> <accomp>]
Feb 16 11:11:30 localhost pppd[3313]: Modem hangup
Feb 16 11:11:30 localhost pppd[3313]: Connection terminated.
Feb 16 11:11:30 localhost pppd[3313]: Exit.

I think it's the fifth line that shouldn't be there (or shouldn't be
followed directly by a modem hang-up. What am I doing wrong here? Is there
something trivial I'm not looking at?

What options should I select on the client-side (for example
IP-headercompression, should this be on?)

I know it's not the firewall that causes my problems, I've set it up to let
through (input and output) all the packages for testing purpose.

I would be very glad with a response. If you need any further info to debug
this problem, I'll be grateful (ofcourse) to supply this.

Thanks in advance,

        Greetz -- Jurrie
        jurr at tref.nl
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