On Mon, 2011-10-10 at 12:29 +0100, Kiall Mac Innes wrote: > Hi Mark, > > That part I understand :) Consider these rules (nabbed from forum posting > here<http://www.zeroshell.net/eng/forum/viewtopic.php?p=655&sid=76f8a08777176b9f939642734f2b23d0#655> > ): > > iptables -t nat -A prerouting_rule -d WAN_IP -p tcp --dport 80 -j DNAT --to > > 192.168.0.10 > > iptables -A forwarding_rule -p tcp --dport 80 -d 192.168.0.10 -j ACCEPT > > iptables -t nat -A postrouting_rule -s 192.168.0.0/24 -p tcp --dport 80 -d > > 192.168.0.10 -j MASQUERADE > > > Some pretty "basic" iptables based router distro's like pfSense etc call > this hairpin NAT or NAT reflection..
Ah, I see - hairpin is basically adding a rule which snats (as well as the standard dnat) connections from the private network to the public IP > And, I'm wondering if a similar technique is possible with the rules > OS generates? It seems perfectly possible to me - you'd need to add something similar to that last rule in ensure_floating_forward() in linux_vnet.py The only tricky bit is that you'll need to pass the fixed IP network's cidr down from init_host_floating_ips() - I'm guessing it's available by something like floating_ip['fixed_ip']['network']['cidr'] If you've any trouble getting it working, at least file a bug in launchpad - it sounds like a useful feature Cheers, Mark. _______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
