Why X server/client with xdmcp over PPTP not work?

Why X server/client with xdmcp over PPTP not work?

Post by Chri » Mon, 02 Sep 2002 16:11:45



Hi,

I managed to setup PPTP connection between Linux server and Win 2k client.

                    Win 2k                                    LINUX RH 7.3

eth0   <---->              ppp0  <-------->   ppp0          <-------->   eth0

192.168.2.105/24    192.168.5.200/24    192.168.5.2/24           192.168.1.3

I can ping from both ends of tunnel eth0 interfaces but X-Win32 server not work over PPTP using xdmcp protocol?

If I not use PPTP tunnel and I change the IP on Win 2k eth0 to be in 192.168.1.0/24 network X-Win32 server manage to
connect well to Linux box.

I already changed and edited Xaccess and to Xservers allow all connections and not just 192.168.1.0 network.

Any hint please?

Any other VPN solution for X-Win32 server that work over NAT (D-link)   ?

Chris Popescu

 
 
 

Why X server/client with xdmcp over PPTP not work?

Post by Steve Cowle » Mon, 02 Sep 2002 21:15:25



> Hi,

> I can ping from both ends of tunnel eth0 interfaces but X-Win32 server
> not work over PPTP using xdmcp protocol?

Odd! Xwin32 (configured for XDMCP) works fine across pptp, ip/gre, ipsec
based tunnels at this end.

Quote:

> If I not use PPTP tunnel and I change the IP on Win 2k eth0 to be in
> 192.168.1.0/24 network X-Win32 server manage to connect well to
> Linux box.

> I already changed and edited Xaccess and to Xservers allow all
> connections and not just 192.168.1.0 network.

> Any hint please?

How did you configure XWin32 for XDMCP; Broadcast or Query? Xwin32 must be
configured to issue an XDMCP query (not broadcast) directly to the ip
address or FQDN of your linux box when using a tunnel. By default, broadcast
packets are not routed across tunnels.

Quote:

> Any other VPN solution for X-Win32 server that work over NAT (D-link)   ?

If an XDMCP query does not work, then your problem is probably related to
one of the following:

1) routing tables
2) firewall related. xdmcp=port 177, X=port 6000
3) Misconfigured Xwin32

If all else fails, try using tcpdump to see where your connection is
failing.

Steve Cowles
remove the _ to reply

 
 
 

1. why i still can't use pptp client to connect to windows 2000 pptp server

    Dear all, i have installed pptp client on linux and ppp-2.3.11
                               (1.0.2)

    . When i connect to windows 2000 pptp server, it shows message like


   +chapms-v2 mppe-128 mppe-stateless -deflate noauth
(unknown)[714]: log[pptp_dispatch_ctrl_packet:pptp_ctrl.c:531]: Client
  connection established.
(unknown)[714]: log[pptp_dispatch_ctrl_packet:pptp_ctrl.c:637]: Outgoing
 call established.

    The log message on the windows 2000 show that the authentication can't
    complete in time, so it disconnect user.

    what can't i do now?

    Thanks!!
--
 [1;32m? Origin:  [33mo???T  [37m<bbs.cynix.com.tw>  [m
 [1;31m?? From:  [36mcissun51.cis.nctu.edu.tw [m

2. Acer FM56-ITU/2 hardware internal modem?

3. Linux as PPTP Server for MS PPTP Clients?

4. Please help with screen blanking problem

5. pptp linux client to pptp nt server

6. writing/reading a tape via star (from and to solaris{9,10}): 1000 options!?

7. 3DFX Banshee and Solaris 7

8. why my client-server program in not working over internet ??

9. Getting Linux PPTP-Client working with MS VPN server

10. PPTP client rejects every packet. Why?

11. slow pptp for linux firewall clients, fast pptp from Linux firewall

12. POP server not allowing logins, either locally or from Win95 clients -- WHY?