10-29-2007
So, just to confirm, you have
internet ---> [ broadband ] <--- net 1 ---> [ PIII/Debian ] <--- net 2 --->
where your PIII is using DHCP to get it's IP from broadband
but on net 2 it has a fixed IP and is acting as
(a) DHCP server
(b) router
and in theory should also be doing DNS forwarding?
The machines get DHCP'd and can then access the internet and each other.
Now, do your network rules disable ICMP? (eg ping uses ICMP).
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LEARN ABOUT DEBIAN
shorewall-modules
SHOREWALL-MODULES(5) [FIXME: manual] SHOREWALL-MODULES(5)
NAME
modules - Shorewall file
SYNOPSIS
/usr/share/shorewall/modules
/usr/share/shorewall/helpers
DESCRIPTION
These files specify which kernel modules Shorewall will load before trying to determine your iptables/kernel's capabilities.
The modules file is used when LOAD_HELPERS_ONLY=No in shorewall.conf[1](8); the helpers file is used when LOAD_HELPERS_ONLY=Yes
Each record in the files has the following format:
loadmodule modulename [moduleoption...]
The modulename names a kernel module (without suffix). Shorewall will search for modules based on your MODULESDIR and MODULE_SUFFIX
settings in shorewall.conf[1](8). The moduleoptions are passed to modprobe (if installed) or to insmod.
The /usr/share/shorewall/modules file contains a large number of modules. Users are encouraged to copy the file to /etc/shorewall/modules
and modify the copy to load only the modules required or to use LOAD_HELPERS_ONLY=Yes..if n .sp
Note
If you build monolithic kernels and have not installed module-init-tools, then create an empty /etc/shorewall/modules file; that will
prevent Shorewall from trying to load modules at all.
EXAMPLE
loadmodule ip_conntrack_ftp ports=21,221
FILES
/usr/share/shorewall/modules
/usr/share/shorewall/helpers
/etc/shorewall/modules
/etc/shorewall/helpers
SEE ALSO
shorewall(8), shorewall-accounting(5), shorewall-actions(5), shorewall-blacklist(5), shorewall-hosts(5), shorewall_interfaces(5),
shorewall-ipsets(5), shorewall-maclist(5), shorewall-masq(5), shorewall-nat(5), shorewall-netmap(5), shorewall-params(5),
shorewall-policy(5), shorewall-providers(5), shorewall-proxyarp(5), shorewall-rtrules(5), shorewall-routestopped(5), shorewall-rules(5),
shorewall.conf(5), shorewall-secmarks(5), shorewall-tcclasses(5), shorewall-tcdevices(5), shorewall-tcrules(5), shorewall-tos(5),
shorewall-tunnels(5), shorewall-zones(5)
NOTES
1. shorewall.conf
http://www.shorewall.net/manpages/shorewall.conf.html
[FIXME: source] 06/28/2012 SHOREWALL-MODULES(5)