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 to
reach from the server both networks. If I have one of the set of rules
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 be
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-destination
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
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 --state
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 words
I'd say it's probably a routing problem on the way back.
Baltasar
--
Baltasar Cevc
_____ former 03 gmbh
_____ infanteriestraße 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
have a registered class C network the internet. and the 2nd secure
private network is 192.168.14.0/24 192.168.14.255. The 192.168.14.0/24
network is then routed to the network I want to reach which is
10.0.0.0/9. That routing is handled by the owner of the 10.0.0.0
network. I have been routing between these 2 networks for 4 years.
Sending printer and server data back and forth with no problems. What
seems to be happening is that if I route info from both networks to a
server on my 172.31.0.0 network, it fails. Example. I have a server
with address 172.31.5.210 and I want to reach it from the internet and
the network of 10.0.0.0/9, it won't work. If I remove the rules for
either incoming network, it connects with no problem.
