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Full Discussion: iptables & port 53 (DNS)
Operating Systems Linux Red Hat iptables & port 53 (DNS) Post 302625209 by neutronscott on Tuesday 17th of April 2012 11:38:44 AM
Old 04-17-2012
-L isn't enough. Otherwise I'd assume everything is accepted due to the first rule in RH-Firewall-1-INPUT, ... -L -v -n would be better..

But those are rather restrictive rules. You still would want to add new ones to the top rather than the bottom, use -I instead of -A
 

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iptables action in tc(8)                                               Linux                                              iptables action in tc(8)

NAME
xt - tc iptables action SYNOPSIS
tc ... action xt -j TARGET [ TARGET_OPTS ] DESCRIPTION
The xt action allows to call arbitrary iptables targets for packets matching the filter this action is attached to. OPTIONS
-j TARGET [ TARGET_OPTS ] Perform a jump to the given iptables target, optionally passing any target specific options in TARGET_OPTS. EXAMPLES
The following will attach a u32 filter to the ingress qdisc matching ICMP replies and using the xt action to make the kernel yell 'PONG' each time: tc qdisc add dev eth0 ingress tc filter add dev eth0 parent ffff: proto ip u32 match ip protocol 1 0xff match ip icmp_type 0 0xff action xt -j LOG --log-prefix PONG SEE ALSO
tc(8), tc-u32(8), iptables-extensions(8) iproute2 3 Mar 2016 iptables action in tc(8)
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