RE: iptables and domain services

2001-04-20 Thread Janet Post
Jason, Thank you very much for your help. I appreciate the time you have taken to help me out with my domain problem. I will most definitely check out the BoingWorld tutorial. I understand what you are saying about UDP being a connectionless protocol. That being the case, my rule a

Re: iptables and domain services...

2001-04-19 Thread Jason Healy
At 987720434s since epoch (04/19/01 17:47:14 -0400 UTC), Janet Post wrote: > iptables -I INPUT 1 -m state --state ESTABLISHED,RELATED -j ACCEPT > > This allows ALL connections that have been established or are related > though. In your discription, you describe something much more strict. > Is

Re: iptables and domain services...

2001-04-19 Thread Janet Post
Jason, I used Phil's rule: iptables -I INPUT 1 -m state --state ESTABLISHED,RELATED -j ACCEPT This allows ALL connections that have been established or are related though. In your discription, you describe something much more strict. Is it possible to exploit that, or should I close it off m

Re: iptables and domain services...

2001-04-19 Thread Jason Healy
At 987717599s since epoch (04/19/01 16:59:59 -0400 UTC), Janet Post wrote: > > So you're running a DNS server? > > No. I'm just trying to get name resolution working. > I'm still not clear on this then...What ports do I open to allow my server > and the computers behind it resolve ip numbers?

Re: iptables and domain services...

2001-04-19 Thread Janet Post
>>> "Noah L. Meyerhans" <[EMAIL PROTECTED]> 04/19 4:41 PM >>> On Thu, Apr 19, 2001 at 03:36:37PM -0500, Phil Brutsche wrote: > > > iptables -A INPUT -p UDP --source-port domain -j ACCEPT > > > > Huh? That is completely untrue. If that was the case then any program > > that wished to lookup host

Re: iptables and domain services...

2001-04-19 Thread Janet Post
So you're running a DNS server? No. I'm just trying to get name resolution working. iptables is just trying to resolve the ip numbers in your rules. "iptables -L -n" will change that. Yes. I -finally- figured this out, thanks to Phil and Noah. Noah was correct that iptables hanging was just

Re: iptables and domain services...

2001-04-19 Thread Noah L. Meyerhans
On Thu, Apr 19, 2001 at 03:36:37PM -0500, Phil Brutsche wrote: > > > iptables -A INPUT -p UDP --source-port domain -j ACCEPT > > > > Huh? That is completely untrue. If that was the case then any program > > that wished to lookup hosts in the DNS would need to be run as root > > (ordinary users do

Re: iptables and domain services...

2001-04-19 Thread Phil Brutsche
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 A long time ago, in a galaxy far, far way, someone said... > > iptables -A INPUT -p UDP --source-port domain -j ACCEPT > > Huh? That is completely untrue. If that was the case then any program > that wished to lookup hosts in the DNS would need to b

Re: iptables and domain services...

2001-04-19 Thread Phil Brutsche
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 A long time ago, in a galaxy far, far way, someone said... > I am trying to set up a firewall on my server and am having trouble > with one of my iptables rules. > > I can set up all the rules that I like, but I can't seem to get this > one to work: >

Re: iptables and domain services...

2001-04-19 Thread Noah L. Meyerhans
On Thu, Apr 19, 2001 at 03:59:14PM -0400, Jason Healy wrote: > Or, if you don't feel like opening all 64,000+ of those ports, try a rule > like: > > iptables -A INPUT -p UDP --source-port domain -j ACCEPT > > > Since DNS requests will appear to come from port 53 (domain), this rule lets > all su

Re: iptables and domain services...

2001-04-19 Thread Jason Healy
At 987713387s since epoch (04/19/01 15:49:47 -0400 UTC), Noah L. Meyerhans wrote: > If you run 'netstat -ulp' (as root, of course) you'll find that bind is > listening on some high port. If you allow UDP on ports > 1024 you should > be all set. Or, if you don't feel like opening all 64,000+ of

Re: iptables and domain services...

2001-04-19 Thread Noah L. Meyerhans
On Thu, Apr 19, 2001 at 03:17:24PM -0400, Janet Post wrote: > I have no trouble if I set the policy of the chain in question to > ACCEPT, I have no trouble. The problem is that DNS requests don't usually happen on port 53. You are seeing hangs because iptables is trying to resolve the hostnames