[pptp-server] PPTP masquerade

[Justin Kreger]

You cannot do that, It won't work.

Justin Kreger, MCP MCSE CCNA
jkreger at earthling.2y.net jwkreger at uncg.edu justin at wss.net


On Fri, 22 Jun 2001, Josh Howlett wrote:

> 
> 
> Hi all,
> 
> Has anyone managed to masquerade PPTP clients and got them to talk to
> pptpd?  I'm working on the following set-up:
> 
>  PPTP client-\
>              |
>  PPTP client---Masq--(ip)--PPTP server
>              |
>  PPTP client-/
> 
> It works fine for a single PPTP client, but if a second attempts to
> connect to the same server I get this:
> 
> Jun 22 10:52:58 cypri pptpd[23386]: CTRL: Client 137.222.12.160 control
> connection started
> Jun 22 10:52:58 cypri pptpd[23386]: CTRL: Starting call (launching pppd,
> opening GRE)
> Jun 22 10:52:58 cypri pptpd[23327]: Discarding out-of-order packet 1,
> already have 216
> Jun 22 10:52:58 cypri pppd[23387]: pppd 2.4.0 started by root, uid 0
> Jun 22 10:52:58 cypri pppd[23387]: Using interface ppp1
> Jun 22 10:52:58 cypri pppd[23387]: Connect: ppp1 <--> /dev/pts/2
> Jun 22 10:52:58 cypri pptpd[23386]: Buffering out-of-order packet; got 1
> after 4294967295
> Jun 22 10:52:58 cypri pptpd[23327]: Discarding out-of-order packet 2,
> already have 216
> Jun 22 10:52:58 cypri pptpd[23386]: Packet reorder timeout waiting for 0
> Jun 22 10:52:58 cypri pptpd[23386]: Buffering out-of-order packet; got 2
> after 0
> Jun 22 10:52:58 cypri pptpd[23386]: Missing 12 consecutive packets; got
> 217 after 2
> Jun 22 10:52:58 cypri pptpd[23327]: Discarding out-of-order packet 3,
> already have 217
> Jun 22 10:52:58 cypri pptpd[23386]: Discarding out-of-order packet 3,
> already have 217
> Jun 22 10:52:58 cypri pptpd[23327]: Discarding out-of-order packet 4,
> already have 217
> Jun 22 10:52:58 cypri pptpd[23386]: Discarding out-of-order packet 4,
> already have 217
> Jun 22 10:53:01 cypri pptpd[23327]: Discarding out-of-order packet 5,
> already have 217
> 
> I've read (and followed) the VPN masquerade HOWTO, and it says that this
> set-up is possible assuming the server allow multiple control channels
> to the same IP address.
> 
> Does poptop allow this?  Or could I being doing something else wrong?
> 
> thanks, josh.
> 
> ---------------------------------------
> Josh Howlett, Network Supervisor,
> Networking & Digital Communications,
> Information Systems & Computing,
> University of Bristol, U.K.
> 0117 928 7850 | josh.howlett at bris.ac.uk
> ---------------------------------------
> 
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