Re: [pptp-devel] LCP: timeout sending Config-Requests

[Richard G. <go...@ya...>]

I'm using Debian sid and have upgraded the kernel to
the newest 2.6.8 with the mppe patch also. I do need
the mppe to connect to the server. Now the problem is
like the pptp client doesn't emulate a ppp0 interface
I think.
I checked the config file in /etc/ppp/peers/{VPN}, and
it seems there's no problem. The pppd is 2.4.2; the
noauth parameter is being used.
Any idea?

--- Bradley Kieser <br...@ki...> wrote:

> Yeah, the instructions on the web site are a tad
> faulty - you need to 
> have the ppp device up before you can tcpdump to it.
> There are a few other gotchas too, which I will
> document back to James 
> once I have sorted everything out my side.
> 
> But to answer you Q, this LCP timeout error can be
> regarded as a 
> "generic" error meaning that you are talking to the
> pptp server but it 
> can't go any further than that.
> 
> Are you using mppe? I will take a guess that you
> are.
> 
> The web site has an excellent diagnostic set of
> steps, so go through 
> that. I won't repeat what it says because it is very
> good, very 
> comprehensive and does a great job.
> 
> However, there are some BIG gotchas not really
> obvious on the site, 
> which I will document here. These are from my own
> experience. I hope 
> that a webmaster for the site is reading this so
> that they can update it.
> 
> For the record, my setup is based on Mandrake 10.0.
> 
> If you followed the instructions and you downloaded
> ppd 2.4.2 and the 
> mppe patch, and did the same for the kernel, these
> three problems will 
> hammer you:
> 
>    1) there are two possible pppd patches, each
> making incompatible 
> parameter names possible. One, the "standard" one,
> enables require-mppe, 
> where as the newest (and most used online) has "mppe
> required" as a 
> parameter... but pptpconfig doesn't understand this
> latter parameter set 
> so you can waste a lot of time on this.
>   2) The module name for mppe in the kernel is
> different if the latest 
> patches to what the web site documents. It documents
> the old "mppe" and 
> the newer "ppp_mppe" but it doesn't yet record
> "ppp_mppe_mppc". You need 
> to alias this in your /etc/modules.conf. Mine looks
> like this:
> 
>     alias ppp-compress-18 ppp_mppe_mppc
> 
>   3) The kernel patch and the pppd patch can be
> incompatible. Please 
> check the web site for this. You really need to be
> certain that you are 
> at the same level. But here is another gotacha not
> yet on the web site: 
> The 1.1 patch ONLY works for kernel 2.6.8. If you
> use anything less than 
> that, you need to use 1.0. However, I have had HUGE
> problems getting 1.0 
> to work with some VPNs, so moral of the story is
> that if you find out 
> that you have run into kernel module problems, then
> you are well advised 
> to use the latest patches and 2.6.8.
> 
> Having said that, ensure that you install the
> STANDARD paramters patch. 
> If you use the newer parameters form, then you will
> not be able to use 
> pptpconfig properly without changing your
> /etc/ppp/peers/{VPN} where 
> {VPN} is your VPN config.
> 
> My guess is that what you really need to do is first
> turn on debugging 
> (debug option) and check if you also need to have
> the "noauth" option 
> added. To use tcpdump, get a terminal with the
> tcpdump command ready, 
> then fire up the VPN with pptpconfig and almost
> simultaneously hit the 
> return key in the tcpdump window... there are better
> methods that get 
> the ppp device up but this is probably your most
> foolproof and easiest 
> option atm.
> 
> Hope that this helps!
> 
> Brad
> 
> Richard Gong wrote:
> 
> >Hi, all,
> >
> >I can't get the pptp client work. It has the
> following
> >error:
> >
> >    sent [LCP ConfReq id=0x1 <asyncmap 0x0 <magic
> >0x8d2b2758> <pcomp> <accomp>]
> >
> >After trying several times, it terminated by
> timeout.
> >
> >The error is got when I run tcpdump -i ppp0
> >    ioctl: No such device
> >
> >How come? Please help.
> >
> >
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