From mboxrd@z Thu Jan 1 00:00:00 1970 From: Samuele Giovanni Tonon Subject: nat and multicast over ipv4 Date: Sun, 27 Jul 2003 23:57:42 +0200 Sender: netfilter-admin@lists.netfilter.org Message-ID: <20030727215742.GA23685@linuxasylum.net> Mime-Version: 1.0 Return-path: Content-Disposition: inline Errors-To: netfilter-admin@lists.netfilter.org List-Help: List-Post: List-Subscribe: , List-Id: List-Unsubscribe: , List-Archive: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: netfilter@lists.netfilter.org hi, after trying some configuration i didn't come with a solution for the following problem: a Linux box with two eths is acting as a gateway that nat a private lan to go to the internet. The ISP use multicast, and all the isp routers are capable of forwardin multicast traffic. i would like to make it possible to join to multicast group from the inside lan. So the linux box has to forward/nat (i read igmp nat is in the TODO of netfilter) igmp announcement, and after the join it has to forward udp traffic that comes from 224/4. What are the steps to do that with iptables ? Does the linux box has to have Multicast Routing options in the kernel enable ? (looking to the help from the kernel it doesn't look it has to be enable) . Multicast-HOWTO is rather old, and it doesn't have any hint, also mrouted is needed only when you want to tunnel the multicast traffic from a lan to an another that is multicast capable, but that's not the examples 'cause the isp after the linux box can "understand" multicast. Any hint, suggestion, resource for this problem ? Thanks Samuele -- When all the network has eyes, even if we were to send out minds turned into light or electrons... It is a time when "one" is not able to make a "solid", a complex, into data yet...