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Full Discussion: iptables help with rules
Top Forums UNIX for Advanced & Expert Users iptables help with rules Post 302988725 by stomp on Sunday 1st of January 2017 10:02:37 AM
Old 01-01-2017
Hi,

for debugging purposes I suggest you add some these logging rules

Code:
# Logging rules of what packages are dropped
iptables -A INPUT -j LOG
iptables -A OUTPUT -j LOG
iptables -A FORWARD -j LOG

Just before the Default-Drop-Rules

Code:
# Setting default filter policy 
iptables -A INPUT -j DROP 
iptables -A OUTPUT -j DROP 
iptables -A FORWARD -j DROP

You should find the messages of the drop rules somewhere within the /var/log directory - most likely in log file kern.log there.

As for a possible error I'm wondering if state NEW for dns is sufficient. I would add ESTABLISHED to.

What I'm wondering too ist that you use 2 different methods to define your state. You use conntrack/cstate for ssh and state for dns/http. I suggest to use the state method for ssh too. (Never used conntrack with this).

Last edited by stomp; 01-01-2017 at 11:45 AM..
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IPTABLES-XML(8) 														   IPTABLES-XML(8)

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) Jul 16, 2007 IPTABLES-XML(8)
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