Problem dial-in server with internet connection

The situation is as follows: I have a LAN which is connected to the
internet through a adsl-router (10.0.0.138) which also runs the DNS and
DHCP server for my LAN. Furthermore I have a server (10.0.0.155, RedHat
8.0) which runs an Apache server and several other services for LAN and
Internet users. This all works fine.

Since a short while we have the possibillity of a free telephone
connection between our office and a home user. At this moment the home
user has to dial-in at an normal ISP and has to pay per time. So now we
want to have this user to dial-in into our LAN to reduce costs. So we
did set-up a modem and mgetty at our server (10.0.0.155). And indeed,
the home-user (10.0.0.190) is able to call-in and make a connection as a
terminal. In fact he can reach any service running at the server
(10.0.0.155) including our website, ftp etc.

But now the problem: the home user (10.0.0.190) is unable to reach the
internet. In fact is he unable to ping any other box on the LAN, so
including the internet-router.

What we would like to obtain is:
OR the already mentioned above working stuff extended so that the home
user (10.0.0.190) also can use the internet
OR kinda pipeline from the home-user (10.0.0.190) to the
internet-router(10.0.0.138) through our server(10.0.0.155).

Does anybody have a clue in which direction I should search?

Thanks in advance,
Richard

Richard Boekamp wrote:

> Does anybody have a clue in which direction I should search?

cat /proc/sys/net/ipv4/ip_forward

If it contains a 0 try:

echo 1 > /proc/sys/net/ipv4/ip_forward

Also the router must be able to find the modem user, so maybe you'll
need to use the proxy arp pppd option as well...

Or just add a static arp entry on the server using:

arp -s 10.0.0.190 mac_address_of_server

X.

Xenna wrote:

> Richard Boekamp wrote:
>
> > Does anybody have a clue in which direction I should search?
>
> cat /proc/sys/net/ipv4/ip_forward
>
> If it contains a 0 try:
>
> echo 1 > /proc/sys/net/ipv4/ip_forward
>
> Also the router must be able to find the modem user, so maybe you'll
> need to use the proxy arp pppd option as well...
>
> Or just add a static arp entry on the server using:
>
> arp -s 10.0.0.190 mac_address_of_server
>
> X.

Gheezzz of course... I should have thought of the IP-forwarding setting
myself..... Thanks a lot since this single zero was indeed screwing
everything up for several weeks... ( proxy arp was already included as
a pppd option and turns out to work fine...

THANKS A LOT

Richard