Yesterday I got a new computer as my homeserver, a HP Proliant Microserver.
Installed Arch Linux on it, with kernel version 3.2.12.
After installing iptables (18.104.22.168 – the current version AFAIK) and changing the
net.ipv4.ip_forward key to 1, and enabling forwarding in the iptables configuration file (and rebooting), the system cannot use any of its network interfaces. Ping fails with
Ping: sendmsg: operation not permitted
If I remove iptables completely, networking is okay, but I need to share the Internet connection to the local network.
eth0 – wan NIC integrated on the motherboard (Broadcom NetXtreme BCM5723).
eth1 – lan NIC in a pci-express slot (Intel 82574L Gigabit Network)
Since it works without iptables(server can access the internet, and I can login with ssh from the internal network), I assume it has something to do with iptables. I do not have much experience with iptables, so I used these as reference (separate from each other of course…):
On my previous server, I used the revsys guide to set up nat, worked like a charm.
Anyone experienced anything like this before? What am I doing wrong?