From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Oliver Schulze L." Subject: Re: Forwarding multiple UDP ports Date: Fri, 22 Sep 2006 12:35:25 -0400 Message-ID: <451410CD.6020102@samera.com.py> References: <45140C99.8040205@samera.com.py> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: netfilter-bounces@lists.netfilter.org Errors-To: netfilter-bounces@lists.netfilter.org Content-Type: text/plain; charset="us-ascii"; format="flowed" To: netfilter@lists.netfilter.org Hi Jan, sorry about not specifying. INTRA_SERVER: intranet ip of the server initiation the udp traffic to the INTRA_ROUTER IP INTRA_ROUTER: intranet ip of the router INET_IP: a random public IP The traffic flow should be: INTRA_SERVER -> intranet -> INTRA_ROUTER -> internet -> INET_IP Explanation: INTRA_SERVER sends UDP traffic to the INTRA_ROUTER IP, then, INTRA_ROUTER forwards those packets to the public IP INET_IP Thanks Oliver Jan Engelhardt wrote: >> My question is: can I forward UDP trafic from and internal server to the >> Internet? >> Can I use this line: >> >> iptables -t nat -A PREROUTING -p udp -s INTRA_SERVER -d INTRA_ROUTER >> --dport 1024:6000 -j DNAT --to-destination INET_IP:1024-6000 >> >> I'm testing it and I see the rule matched, the byte and packet counters are >> incrementing. >> But, I see no traffic going out of the Internet NIC. >> I'm not sure if the multi-port specification will work. >> > > Who is INET_IP? Is it the same host as INTRA_ROUTER? > > > Jan Engelhardt > -- Oliver Schulze L. Get my e-mail after a captcha test in: http://tinymailto.com/oliver