Scheduled Maintenance: We are aware of an issue with Google, AOL, and Yahoo services as email providers which are blocking new registrations. We are trying to fix the issue and we have several internal and external support tickets in process to resolve the issue. Please see: viewtopic.php?t=158230

 

 

 

DNS Problems

Linux Kernel, Network, and Services configuration.
Post Reply
Message
Author
thewolfro
Posts: 18
Joined: 2004-03-20 07:52
Location: Romania
Contact:

DNS Problems

#1 Post by thewolfro »

Hi I'm using Debian Woody, and i configured a master DNS
server on my network. It suposed to transfer the master zone
to my ISP but it doesn't. from the local network, the server
works fine, it resolves names and accepts telnet on port 53
from the local machines. if i try to use telnet from a
machine located in the internet it does not respond.
if i look in the netstat i see olnly the syn_sent flag.
I tried to do a namp from the external IP and it seens that
domain port is filtered. when i did the same thing but from
my local machine i can see that my domain port is opend.
in my firewall i have POLICY ACCEPT for the output and I have
accepted all the packets from that external IP address,
and from the ISP's DNS. i have tried olso to log from firewall
the connections from the external IP and it seems that i have
an incoming packet and a response to that (an outgoing packet)
so it seens to me that the problem is not im my firewall.
just to be shoure i have used the command
/etc/init.d/iptables clear (to get rid of the firewall), but no
results. telnet on other ports like 80 etc works fine.
can you help me??

User avatar
MarkvD
Posts: 77
Joined: 2004-02-15 21:36
Location: Rhoon, Holland

#2 Post by MarkvD »

I'm not sure. can it have something to do with /etc/services?
Look for port 53 in this file on your firewall.
Tell us what it says in this line.

thewolfro
Posts: 18
Joined: 2004-03-20 07:52
Location: Romania
Contact:

#3 Post by thewolfro »

i don't think it is from my firewall because without firewall, the telnet still doesn't work. the command "/etc/init.d/iptables clear" put Accept Plicy in all chains.
but if ypu like, the Iptable entry is something like

iptables -A INPUT -s $ip_from_the_internet -j ACCEPT
where ip_from_the_internet is the ip from where i try to use telnet on the 53' port
i

User avatar
MarkvD
Posts: 77
Joined: 2004-02-15 21:36
Location: Rhoon, Holland

#4 Post by MarkvD »

I can't help right away, I have to look in to it!

thewolfro
Posts: 18
Joined: 2004-03-20 07:52
Location: Romania
Contact:

#5 Post by thewolfro »

you want to see my firewall or my /etc/services file? i'm a little bit confuse

User avatar
MarkvD
Posts: 77
Joined: 2004-02-15 21:36
Location: Rhoon, Holland

#6 Post by MarkvD »

I've looked in to it but I have to disapoint you.
I can't help you, sorry!

Maybe someone else?

thewolfro
Posts: 18
Joined: 2004-03-20 07:52
Location: Romania
Contact:

#7 Post by thewolfro »

10x a lot i have allready tried on other forums but the people on those forums are not so active like those on this one. i have seen that they have read what i wrote but no answer from them.

10x again. and congratulations for this forum

User avatar
MarkvD
Posts: 77
Joined: 2004-02-15 21:36
Location: Rhoon, Holland

#8 Post by MarkvD »

When you find the answer, let us know please I'm verry curious!

and thanks

Post Reply