Dns Server Inside A Lan

JustMoi · 10-25-2006, 01:44 AM

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<body>
<pre>

*********
** INTERNET **
** **
********* \
\
\ _____
|_____| DSL MODEM
\
\
switch \ __
_______ | | Server (static IP from DSL)
|0 0 0 0|-------| | (Gateway)
/ _______ |__| 192.168.0.1
/ \
__/ \__
| | | |
| | | |
|__| |__|
PC1 PC2
(DNS Server)
192.168.0.2 192.168.0.3

</pre>

How can I make PC2 a DNS Server available to the Internet?

Thanks.
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hhvv · 10-25-2006, 04:17 AM

I prefer iptables
Use port forwarding and NATing

JustMoi · 10-25-2006, 09:03 PM

Thanks...

but port forwarding in PC2 or in the server?

centauricw · 10-25-2006, 10:53 PM

You want to use port forwarding on the server to send all inbound DNS traffic to PC2.

JustMoi · 10-26-2006, 12:46 AM

Ok thanks a lot...

Will try to figure out how to do that.

thanks centauricw & hhvv

tola555 · 10-26-2006, 01:00 AM

what you need is prerouting rule in iptables.

Code:

EXT_IF=eth0
SERVER_IP='192.168.0.1'

iptables -t nat -A PREROUTING -i $EXT_IF -p UDP -d $SERVER_IP --dport 53 -j DNAT --to-destination $PC2_IP

--dport as --destination-port
-d is destination ip in packet header

take a look into http://iptables-tutorial.frozentux.n...-tutorial.html
there is examples at the end and all knowledge you need to do your firewall