Hey everyone, Thanks for hte suggestions. It did turn out to be my rules. I had used one of fwbuilders templates, and it was killing my outbound. I had actually taken one of my previous baremetals fwbuilder files that was known to work on another firewall, and used that one as a basis, and it was good to go. I had a few other oddities as well, that i suspect are unique to my machine for some reason... when running fwbuilder through a ssh session, the script did not install right. When I rean the same one from the FW itself, it installed properly, and all was ok. So my basic issue is resolved, with a few that are non centos related. Thanks again! On 2/22/07, John R Pierce <pierce@xxxxxxxxxxxx> wrote:
Dustin Krysak wrote: > Good day everyone. Today has been "one of those..." days. So I have a > feeling this is just a brain lapse here. > > At any rate, I am setting up a firewall/router using centos 4.4 > (minimal install, yummed up to date). > > I have in fact enables V4 ip forwarding (by editing /etc/sysctl.conf) > and rebooted the system. I use fwbuilder for my rules, and at this > point have a next to nothing set of rules. a DHCP server is also > residing on this router. > ... > Now the issue is, I can not get out of the internal network to the > internet for any traffic. Pings (by ip and name), web sites, etc. sounds like you're trying to do a 'NAT' (network address translation) network, where you're local network is on private IP space (192.168.x.y or 10.x.x.x or whatever), and you're sharing a single public IP. this requires several very specific and moderately complex rules to implement what Linux calls 'MASQUERADE', and you need to load the ip_conntrack module into the kernel, and probably a few more. at a BARE minimum, you need some variant on these two rules... iptables --table nat --append POSTROUTING --out-interface $WAN -j MASQUERADE iptables --append FORWARD --in-interface $LAN -j ACCEPT (where $WAN, $LAN are eth0, eth1, or whatever your internet and local interfaces are) if you google for: LINUX MASQUERADE, you'll find all sorts of confusing info on this :) _______________________________________________ CentOS mailing list CentOS@xxxxxxxxxx http://lists.centos.org/mailman/listinfo/centos
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