From mboxrd@z Thu Jan 1 00:00:00 1970 From: Richmond Dyes Subject: Re: Problem with re-directing from 2 sources to one server Date: Mon, 11 Dec 2006 10:29:08 -0500 Message-ID: <457D7944.8030703@monroehosp.org> References: <4578D213.2000607@monroehosp.org> <7f3d8953df4b91d4f42984cf9cd98d96@former03.de> Reply-To: Richmond.Dyes@monroehosp.org Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <7f3d8953df4b91d4f42984cf9cd98d96@former03.de> 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="iso-8859-1"; format="flowed" To: former03 | Baltasar Cevc Cc: "Netfilter (E-mail)" former03 | Baltasar Cevc wrote: > Hi, > > On 08.12.2006, at 03:46, Richhmond Dyes wrote: > >> I have a server that I have to reach from 2 different networks, the >> Internet and another private network called downtown and I also have t= o >> reach from the server both networks. If I have one of the set of rule= s >> running, it works fine, but if I put both set of rules on, it doesn't >> work. below are my set of rules. Can anyone tell me a how this can b= e >> done? >> >> Here is the setup. >> mynetwork 172.31.0.0/21 >> eth0 172.31.4.254 my network interface >> eth1 192.168.14.1 interface to downtown which on that network's side >> routes to 10.0.0.0/9 >> eth2 publicIP to the internet >> publicnetwork.100 is the virtual address on eth2 called eth2:100 >> 172.31.5.100 is the private ip address of the server I want reached >> 192.168.14.10 is the virtual ip address on eth1 called eth1:10 >> >> >> $IPT -t nat -A PREROUTING -d publicnetwork.100 -j DNAT --to-destinatio= n >> 172.31.5.100 >> $IPT -t nat -A POSTROUTING -s 172.31.5.100 -j SNAT --to-source >> publicnetwork.100 >> >> $IPT -t nat -A PREROUTING -d 192.168.14.10 -j DNAT --to-destination >> 172.31.5.100 >> $IPT -t nat -A POSTROUTING -s 172.31.5.100 -j SNAT --to-source=20 >> 192.168.14.10 >> >> Then I forward all my 10.0.0.0/9 ip requests to downtown >> >> $IPT -A FORWARD -m state --state NEW -i eth0 -s 172.31.0.0/21 -o eth1 >> -d 10.0.0.0/8 -j ACCEPT >> >> Then I forward ip requests from downtown for the server to it. >> $IPT -A FORWARD -i eth1 -s 10.0.0.0/8 -d 172.31.5.100 -m state --state >> NEW -j ACCEPT >> >> Then I forward ip request from the internet to the server. >> $IPT -A FORWARD -i eth2 -s 0/0 -o eth0 -d 172.31.5.100 -m state --stat= e >> NEW -m multiport -p tcp --dport 22,80,1352 -j ACCEPT >> >> Again when I have both set of rules on, it does not work. any ideas? >> > Can you make both of the networks able to communicate with the server > one at a time? > Please specify your networks (network address and bcast) or create a > little ASCII art on how everything's connected. > > I assume that the router does not know where the initial request > came from when trying to descide where to send answers. Or in other wor= ds > I'd say it's probably a routing problem on the way back. > > Baltasar > > > --=20 > Baltasar Cevc > > _____ former 03 gmbh > _____ infanteriestra=DFe 19 haus 6 eg > _____ D-80797 muenchen > > _____ http://www.former03.de > This is the setup. 172.31.0.0/21 172.31.7.255 is my internal network, I=20 have a registered class C network the internet. and the 2nd secure=20 private network is 192.168.14.0/24 192.168.14.255. The 192.168.14.0/24=20 network is then routed to the network I want to reach which is=20 10.0.0.0/9. That routing is handled by the owner of the 10.0.0.0=20 network. I have been routing between these 2 networks for 4 years. =20 Sending printer and server data back and forth with no problems. What=20 seems to be happening is that if I route info from both networks to a=20 server on my 172.31.0.0 network, it fails. Example. I have a server=20 with address 172.31.5.210 and I want to reach it from the internet and=20 the network of 10.0.0.0/9, it won't work. If I remove the rules for=20 either incoming network, it connects with no problem.