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iptables & port 53 (DNS)

 
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Operating Systems Linux Red Hat iptables & port 53 (DNS)
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Old 04-17-2012
iptables & port 53 (DNS)
Hi,

I have a newly built RHEL5 OS that is unable to talk to the DNS server. I am unable to telnet resolv.conf entry over port 53 but apparently this port has been opened.

Code:
# telnet 209.212.96.1 53

and.....

Code:
# dig www.google.com
; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_4.2 <<>> www.google.com
;; global options: printcmd
;; connection timed out; no servers could be reached

I can only assume therefore that this is a server issue.

So, I have added the following entry to my iptables:

Code:
# iptables -A INPUT -s 41.181.59.124/29 -d 209.212.96.1 -m state --state NEW -m tcp -p tcp --dport 53 -j ACCEPT
 
# iptables -nL
Chain INPUT (policy ACCEPT)
target prot opt source destination 
RH-Firewall-1-INPUT all -- 0.0.0.0/0 0.0.0.0/0 
ACCEPT tcp -- 41.181.59.120/29 0.0.0.0/0 state NEW tcp dpt:53 
ACCEPT tcp -- 41.181.59.120/29 209.212.96.1 state NEW tcp dpt:53

But still unable to telnet to the nameserver over port 53.

Can anybody provide any pointers to what I can try next?

R,
D.
Last edited by Duffs22; 04-17-2012 at 09:42 AM..
 
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