iptables question

09kevin77 · 02-13-2006, 07:28 AM

I have built a nice iptables based firewall and am now trying to lock it down. My question is this:

I want to deny web access (which i have done successfully), but I would like to allow mapquest (fully functional), and grisoft (for downloading updates). I have looked and tried to allow the subdomains for these, but is there an easy rule(s) to enter that will allow this?

For example allow *.mapquest.com

Thanks all

Kevin

bulliver · 02-13-2006, 03:17 PM

Are you trying to allow this from inside or outside?

If you are trying to allow web access only to these two sites then you simple place rules to allow the connection into the output chain before the blanket rule that denies web access.

09kevin77 · 02-14-2006, 06:29 AM

I am denying web access to certain pc's (going out) and I understand what you are telling me, but my question was what is the rule I use?

When I tell it to allow everything from mapquest, do I use *.mapquest.com or mapquest.com, can someone provide me qith a rule so I can see?

Thanks.

Kevin

win32sux · 02-14-2006, 10:39 AM

Code:

iptables -I FORWARD -p TCP -i $LAN_IFACE -o $WAN_IFACE \
-d mapquest.com -j ACCEPT

BTW, i don't think it's a good idea to do domain filtering with iptables... i mean, i could be wrong, but i assume the IP would be resolved when the script is run and then the IP will be used from that point forward, in which case the filtering wouldn't work if mapquest.com changes the IP or if the client is redirected to a different IP than the one which was resolved when the script was run...