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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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BSDE_GET_RULE_COUNT(3)					   BSD Library Functions Manual 				    BSDE_GET_RULE_COUNT(3)

NAME
bsde_get_rule_count, bsde_get_rule_slots -- file system firewall statistics LIBRARY
File System Firewall Interface Library (libugidfw, -lugidfw) SYNOPSIS
#include <ugidfw.h> int bsde_get_rule_count(size_t errlen, char *errstr); int bsde_get_rule_slots(size_t errlen, char *errstr); DESCRIPTION
The bsde_get_rule_count() and bsde_get_rule_slots() functions return the total number of enforced rules and the total number of used rule slots, respectively. If an error occurs, *errstr is filled in with the error string (up to errlen characters, including the terminating NUL). RETURN VALUES
The bsde_get_rule_count() and bsde_get_rule_slots() functions return the number of enforced rules and rule slots (respectively) if success- ful; otherwise the value -1 is returned and the value of *errstr is filled in as documented in DESCRIPTION. SEE ALSO
bsde_delete_rule(3), bsde_get_rule(3), bsde_parse_rule(3), bsde_parse_rule_string(3), bsde_rule_to_string(3), bsde_set_rule(3), libugidfw(3), mac_bsdextended(4), ugidfw(8) AUTHORS
This software was contributed to the FreeBSD Project by Network Associates Labs, the Security Research Division of Network Associates Inc. under DARPA/SPAWAR contract N66001-01-C-8035 (``CBOSS''), as part of the DARPA CHATS research program. BSD
January 7, 2003 BSD
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