I have a desktop machine onto which I installed woody, which originally ran a 2.2.20 kernel and was configured using heimdall to use ipchains
for firewalling. (There is a script /etc/heimdall/firewall.sh which invokes ipchains rules.) Awhile ago, I built a custom 2.4.18 kernel and have been running that. This machine uses a dial-up connexion to connect
to my ISP, and I now want to allow access to the dial-up connexion via a
local network to a laptop that I have just acquired pre-installed with sarge.
In trying to figure out what I have to do get this to work, I tried running ipchains -L on the desktop, and got the response:
ipchains: Incompatible with this kernel
(iptables is not installed, since I didn't want to screw up the 2.2.20 configuration.)
This is strange. Looking at the options I used in building the 2.4.18 kernel, I see that under "IP: Netfilter configuration", I specified both IP tables and ipchains support as modules. Does this mean that since changing to a 2.4 kernel that I lost firewalling? There don't seem to be any error messages in the system log files relating to ipchains.
Have you checked to see that the ipchains module is inserted? Do an lsmod to see, and if not, insert it with modconf.
As for IP masquerading (which is what you want so that your laptop can access the net through your desktop), have a look at the following:
http://en.tldp.org/HOWTO/IP-Masquerade-HOWTO/ http://www.tldp.org/HOWTO/IPCHAINS-HOWTO.html
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