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

SourceForge Headquarters 1320 Columbia Street Suite 310 San Diego, CA 92101 +1 (858) 422-6466

pptp doesn't emulate ppp0, it initiates the chat with the server then 
actually runs pppd to enable ppp.

I found that often syslog (or messages) has info in it that isn't 
reported in the pptp debug output. Have you got mppe enabled? Simply 
having it in the s/ware isn't good enough.

Here are my relevant /etc/ppp/peers/{vpn} options:

refuse-eap
nomppc
nopcomp
mppe required,no40
require-mschap-v2
require-mschap
debug

Not, though, that I have only been able to get a connection going to my 
VPN server, the pppd starts up and everything APPEARS to be okay... 
except for the fact that I get no traffic to and from the server after 
pppd has started, so I don't have the thing sorted to completion. I 
believe that there are missing protocols that my config simply doesn't 
have that is resulting in my VPN client software misinterpreting 
packets. Pretty sure that this will work on another M$ VPN.

Brad

Richard Gong wrote:

>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.
>>>
>>>
>>>		
>>>_______________________________
>>>Do you Yahoo!?
>>>Declare Yourself - Register online to vote today!
>>>http://vote.yahoo.com
>>>
>>>
>>>      
>>>
>>-------------------------------------------------------
>>    
>>
>>>This SF.net email is sponsored by: IT Product Guide
>>>      
>>>
>>on ITManagersJournal
>>    
>>
>>>Use IT products in your business? Tell us what you
>>>      
>>>
>>think of them. Give us
>>    
>>
>>>Your Opinions, Get Free ThinkGeek Gift
>>>      
>>>
>>Certificates! Click to find out more
>>
>>http://productguide.itmanagersjournal.com/guidepromo.tmpl
>>    
>>
>>>_______________________________________________
>>>pptpclient-devel mailing list
>>>ppt...@li...
>>>      
>>>
>>https://lists.sourceforge.net/lists/listinfo/pptpclient-devel
>>    
>>
>>> 
>>>
>>>      
>>>
>>    
>>
>
>
>
>		
>_______________________________
>Do you Yahoo!?
>Express yourself with Y! Messenger! Free. Download now. 
>http://messenger.yahoo.com
>
>
>-------------------------------------------------------
>This SF.net email is sponsored by: IT Product Guide on ITManagersJournal
>Use IT products in your business? Tell us what you think of them. Give us
>Your Opinions, Get Free ThinkGeek Gift Certificates! Click to find out more
>http://productguide.itmanagersjournal.com/guidepromo.tmpl
>_______________________________________________
>pptpclient-devel mailing list
>ppt...@li...
>https://lists.sourceforge.net/lists/listinfo/pptpclient-devel
>
>  
>