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Full Discussion: iptables & port 53 (DNS)
Operating Systems Linux Red Hat iptables & port 53 (DNS) Post 302625071 by Duffs22 on Tuesday 17th of April 2012 08:34:24 AM
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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IPTABLES-XML(1) 						  iptables 1.4.21						   IPTABLES-XML(1)

NAME
iptables-xml -- Convert iptables-save format to XML SYNOPSIS
iptables-xml [-c] [-v] DESCRIPTION
iptables-xml is used to convert the output of iptables-save into an easily manipulatable XML format to STDOUT. Use I/O-redirection pro- vided by your shell to write to a file. -c, --combine combine consecutive rules with the same matches but different targets. iptables does not currently support more than one target per match, so this simulates that by collecting the targets from consecutive iptables rules into one action tag, but only when the rule matches are identical. Terminating actions like RETURN, DROP, ACCEPT and QUEUE are not combined with subsequent targets. -v, --verbose Output xml comments containing the iptables line from which the XML is derived iptables-xml does a mechanistic conversion to a very expressive xml format; the only semantic considerations are for -g and -j targets in order to discriminate between <call> <goto> and <nane-of-target> as it helps xml processing scripts if they can tell the difference between a target like SNAT and another chain. Some sample output is: <iptables-rules> <table name="mangle"> <chain name="PREROUTING" policy="ACCEPT" packet-count="63436" byte-count="7137573"> <rule> <conditions> <match> <p>tcp</p> </match> <tcp> <sport>8443</sport> </tcp> </conditions> <actions> <call> <check_ip/> </call> <ACCEPT/> </actions> </rule> </chain> </table> </iptables-rules> Conversion from XML to iptables-save format may be done using the iptables.xslt script and xsltproc, or a custom program using libxsltproc or similar; in this fashion: xsltproc iptables.xslt my-iptables.xml | iptables-restore BUGS
None known as of iptables-1.3.7 release AUTHOR
Sam Liddicott <azez@ufomechanic.net> SEE ALSO
iptables-save(8), iptables-restore(8), iptables(8) iptables 1.4.21 IPTABLES-XML(1)
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