🚀 go-pugleaf

I am experiencing trouble getting and IP -IP tunnel operation over a PPP
connection between two linux servers.

The setup and rationale behind the setup of the ip-ip tunnel is as
follow:

At work I have a Linux box with dial in PPP enabled and operational. The
ethernet card (Clone NE2000 - eth0) has an IP address of
192.168.117.120, and is connected to A class C Network 192.168.117.0.
The name of this server is mercury. The dialin modem assigns the IP
address 192.168.117.121 to the remote end of the PPP connection.

At home I have a Network of thre Linux PC's. All machines on the home
network are on the IP Class C Network of 192.168.117.254. Philglt (
192.168.254.1) functions as the router for the network, and contains a
PCMCIA ehternet card, and a PCMCIA Modem. This machine used diald to
establish a PPP connection to Apollo at work, and Masquarades all
192.168.254.0 (as 192.168.117.121) addresses on the work network except
for apollo.

Mercury ( 192.168.254.2) and philg_apn (192.168.254.3) are connected to
phiglt via coax, and both have their default route pointing to philglt.

The entire network operates correctly, with routing between
192.168.117.0 and 192.168.254.0 operational.

The problem is that I am trying to setup an IP tunnel from apollo to
either mercury, or philg_apn, so that either of these machine has an ip
address in the 192.168.117.0 Class C network.

The reason for this requirement is that on the 192.168.117.60 is a
proprietry computer (called and ATEX), that uses has a special windows
ATEX terminal emulation package to access it from normal PC's. ( The
terminal Emulator is nothing like telnet or simple comms client, and
uses a highly proprietry protocol encapsulated in IP for remote access).
I am using Wine to run the emulator, and when my laptop (philg_apn) is
connected to the 192.168.117.0 network ( as 192.168.117.122) the
emulator work perfectly, and all is well with the world.

When dialed in, I am able to ping and traceroute successfully to the
ATEX server (192.168.117.60) using the masquarading setup already in
place, but I am not able to use the wine and windows Atex emulator to
connect successfully. Therefore I beleive that I need to have an IP-IP
tunnel so that either mercury, and/or philg_apn appear to be on
192.168.117.0.

I have read the various documents on the setup of the IP tunnels,
including NET-2-HOWTO, and NET-3-HOWTO's, VPN mini-HOWTO, and the
README.tunnel in the linux source tree. I have followed the instruction
in the README.tunnel in from the linux source tree, but the tunnel does
not appear to operate as I expect.

Kernal Versions on PHILG_APN and MERCURY are 2.0.35, while Apollo is
2.0.34. Slackware 3.5 (I think) is installed on all machines.


The following is the setup's that I am performing on each machine.

APOLLO
---------
Routing Table before
---------------
Destination           Gateway
Genmask                          Flags Metric Ref    Use Iface
127.0.0.3                *
255.255.255.255               UH    1500   0            0     sl0
xxx.xxx.xxx.xxx  *
255.255.255.255               UH    1500   0            9     ppp0
192.168.117.121  *
255.255.255.255              UH    1500   0            1      ppp1
192.168.117.0       *
255.255.255.0                  U        1500   0     2977     eth0
192.168.116.0       192.168.117.30      255.255.255.0
UG    1500   0           0     eth0
192.168.118.0       192.168.117.30      255.255.255.0
UG    1500   0         49     eth0
192.168.119.0       192.168.117.30      255.255.255.0
UG    1500   0           0     eth0
192.168.254.0       192.168.117.121   255.255.255.0
UG    1500   0           2     ppp1
192.168.0.0            192.168.117.1
255.255.0.0                       UG    1500   0       125     eth0
127.0.0.0                 *
255.0.0.0                            U        3584   0      112     lo
default                     *
*                                           U        1500   0
355     ppp0
default                     *
*                                           U        1500   0
9     sl0

Notes: xxx.xxx.xxx.xxx is the IP Address of Apollo on the Internet

Commands
-----------
apollo:/home/philg$ insmod ipip; insmod new_tunnel
apollo:/home/philg$ ifconfig tunl0 192.168.117.120 pointopoint
192.168.254.3
apollo:/home/philg$ ifconfig tunl0 netmask 255.255.255.0
apollo:/home/philg$ route add 192.168.117.119 dev eth0
apollo:/home/philg$ arp -s 192.168.117.119 00:00:E8:32:F3:B6 pub

Note: 00:00:E8:32:F3:B6 is the Ethernet Hardware Address as reporteds by
ifcofnig for eth0

Routing Table After
---------------
Destination              Gateway                 Genmask
Flags     MSS    Window Use Iface
127.0.0.3                   *
255.255.255.255   UH        1500         0             0     sl0
xxxx.xxxx.xxxx      *
255.255.255.255    UH        1500        0           10     ppp0
192.168.117.121     *
255.255.255.255   UH        1500        0             2     ppp1
192.168.117.119     *
255.255.255.255    UH        1500        0             0     eth0
192.168.117.0          *
255.255.255.0        U            1500        0      2983     eth0
192.168.116.0          192.168.117.30        255.255.255.0
UG        1500        0             0     eth0
192.168.118.0          192.168.117.30        255.255.255.0
UG        1500        0           49     eth0
192.168.119.0          192.168.117.30        255.255.255.0
UG        1500        0             0     eth0
192.168.254.0          192.168.117.121      255.255.255.0
UG        1500         0             2     ppp1
192.168.0.0              192.168.117.1           255.255.0.0
UG        1500         0        125     eth0
127.0.0.0                   *
255.0.0.0                 U            3584        0        113     lo
default                       *
*                                U            1500        0
357     ppp0
default                       *
*                                U            1500        0
9     sl0



PHILG_APN
------------
Routing table before
-------------
Destination           Gateway             Genmask         Flags Metric
Ref    Use     Iface
192.168.254.0       0.0.0.0                 255.255.255.0
U             0      0        3           eth0
127.0.0.0                0.0.0.0                 255.0.0.0
U             0      0        5           lo
0.0.0.0                     192.168.254.1   0.0.0.0
UG         0      0       26         eth0

commands
---------
[root@philg_apn:/]$ insmod ipip; insmod new_tunnel
[root@philg_apn:/]$ ifconfig tunl0 192.168.117.119 pointopoint
192.168.117.120
[root@philg_apn:/]$ ifconfig tunl0 netmask 255.255.255.0
[root@philg_apn:/]$ route add -net 192.168.117.0 dev tunl0

Routing table after
-------------
Destination           Gateway                Genmask         Flags
Metric Ref    Use     Iface
192.168.254.0       0.0.0.0                     255.255.255.0
U           0          0        4         eth0
192.168.117.0       0.0.0.0                     255.255.255.0
U           0          0        1         tunl0
127.0.0.0                0.0.0.0
255.0.0.0             U           0          0        6         lo
0.0.0.0                     192.168.254.1       0.0.0.0
UG        0         0       27        eth0


Once this setup up is complete I am able to ping 192.168.117.119 from
philg_apn, but not from apollo (192.168.117.120)

I have scoured the Web, and news groupd for a possible answer but to no
avail.

I hope that someone can provide some assistance in getting this to work.
Thanks in advance for any suggestions.

PS. Sorry about the table formatting for the routing tables - I known it
looks horrible.

--
Phillip Gersekowski
Computer Systems Manager
Toowoomba Newspapers Pty Ltd
Email: philg@c-link.com.au

Linux User and Proud of It.