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OS/2 Shareware BBS: 35 Internet
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isdnpm29.zip
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masquere.txt
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1997-05-04
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The 'IP-Masquerading' feature ( IP-M ):
In IP packages the IP-masquerading function manipulates
for each outgoing IP package the sender's IP address and port.
These manipulations are reset when incoming IP packages are received.
When is IP-M useful?
1.) Your provider has assigned you ONE dynamic or fixed IP address
but you wish to provide other computers in your LAN with an
internet access, too.
LAN
10.1.1.1 +-----------+
| | Linux |
+---------------+ +--------------+ |
| | | | |
| 10.1.1.254 | +-----------+
| | |
ISDN | OS/2 mit +-------+ +------------+
| ISDNPM | | 10.1.1.2 | W95 |
......... | | +--------------+ |
+---------------+ | | |
| +------------+
132.130.4.5 |
| +------------+
| 10.1.1.3 | OS/2 |
+--------------+ |
| | |
| ...... +------------+
|
The following configurations are required on your ISDNPM machine:
1.1 Configuration of the Lan interface (TCPCFG.EXE)
1.2 Make sure the forwarding of IP packages between your LAN
and the serial interface (sl0) as well as the 'IP FORWARDING'
function are active. (TCPCFG.EXE)
1.3 The IP-M function must have been activated in 'isdn.cfg'
[ip]
...
if_masquerade : 2 // all IP packages will be
// modified
if_masquerade : 3 // the IP packages of the
// computer on which ISDNPM is run
// are not modified.
// There may be Servers on this
// computer.
The 'DEFAULT-ROUTE' parameter of the computers making up the LAN
must indicate to the OS/2 computer (10.1.1.254)
1.4 If the IP address of your provider is assigned during a
login procedure this must be made clear to the system.
rc = SETLOCALIP(Channel,LocalIp)
2.) Your provider has assigned you ONE dynamic IP address. This may
cause problems when the connection is set up with 'AUTODIAL'
(i.e. the IP connection is not achieved immediately)
IP-M helps you to get around this problem.
2.1 When configuring you ISDNPM pretend to have a fixed IP address
(NO 'IfconfigFile' in isdnuser.cfg and NO interface configuration
in TONLINE.FNC)
2.2 Activate IP-M in 'isdn.cfg'
[ip]
...
if_masquerade : 2 // all IP packages will be
// modified
What IP-M cannot do:
It is NOT possible to establish any connections to the PCs of the LAN
from outside (from the internet).
When ISDNPM is installed on a PC this machine may NOT be used as a
server (for FTPD...).