I am not sure when it happened, but at some point, a ProxyARP'd server I have
running in my network is no longer visible either internally or externally.
I am running Shorewall 4.4.9 on a Gentoo box.
The relelvant config files are as follows
INTERFACES file
#ZONE INTERFACE BROADCAST OPTIONS
net ppp0 -
dhcp,tcpflags,nosmurfs,routefilter,proxyarp,routeback,blacklist
loc eth1 detect
tcpflags,nosmurfs,routefilter,proxyarp,routeback,blacklist
POLICIES
###############################################################################
#SOURCE DEST POLICY
LOG LEVEL LIMIT:BURST
loc net ACCEPT
net all DROP
info
# THE FOLLOWING POLICY MUST BE LAST
all all REJECT
info
FIREWALL RULES - relevant to the ProxyArp'd address
# Hosting Box
ACCEPT:info net loc:203.36.xx.xxx tcp
20,21,22,25,53,80,110,143,443,993,995
ACCEPT:info net loc:203.36.xx.xxx udp 53
ACCEPT:info net:202.124.xxx.xxx/29 loc:203.36.xx.xxx tcp
ACCEPT:info net:202.124.xxx.xxx/29 loc:203.36.xx.xxx udp
ACCEPT:info net loc:203.36.75.210 tcp
20,21,22,25,53,80,110,143,443,993,995
ACCEPT:info net loc:203.36.75.210 udp 53
SHOREWALL CONF File
###############################################################################
#
# Shorewall version 4.0 - Sample shorewall.conf for two-interface
# configuration.
# Copyright (C) 2006,2007 by the Shorewall Team
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# See the file README.txt for further details.
#
# For information about the settings in this file, type "man shorewall.conf"
#
# The manpage is also online at
# http://shorewall.net/manpages/shorewall.conf.html
#
###############################################################################
# S T A R T U P E N A B L E D
###############################################################################
STARTUP_ENABLED=Yes
###############################################################################
# V E R B O S I T Y
###############################################################################
VERBOSITY=1
###############################################################################
# C O M P I L E R
# (setting this to 'perl' requires installation of Shorewall-perl)
###############################################################################
SHOREWALL_COMPILER=
###############################################################################
# L O G G I N G
###############################################################################
LOGFILE=/var/log/messages
STARTUP_LOG=
LOG_VERBOSITY=
LOGFORMAT="Shorewall:%s:%s:"
LOGTAGONLY=No
LOGRATE=
LOGBURST=
LOGALLNEW=
BLACKLIST_LOGLEVEL=
MACLIST_LOG_LEVEL=info
TCP_FLAGS_LOG_LEVEL=info
SMURF_LOG_LEVEL=info
LOG_MARTIANS=Yes
###############################################################################
# L O C A T I O N O F F I L E S A N D D I R E C T O
R I E S
###############################################################################
IPTABLES=
IP=
TC=
IPSET=
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin
SHOREWALL_SHELL=/bin/sh
SUBSYSLOCK=
MODULESDIR=
CONFIG_PATH=/etc/shorewall:/usr/share/shorewall
RESTOREFILE=
IPSECFILE=zones
LOCKFILE=
###############################################################################
# D E F A U L T A C T I O N S / M A C R O S
###############################################################################
DROP_DEFAULT="Drop"
REJECT_DEFAULT="Reject"
ACCEPT_DEFAULT="none"
QUEUE_DEFAULT="none"
NFQUEUE_DEFAULT="none"
###############################################################################
# R S H / R C P C O M M A N D S
###############################################################################
RSH_COMMAND='ssh ${ro...@${system} ${command}'
RCP_COMMAND='scp ${files} ${ro...@${system}:${destination}'
###############################################################################
# F I R E W A L L O P T I O N
S
###############################################################################
IP_FORWARDING=On
ADD_IP_ALIASES=Yes
ADD_SNAT_ALIASES=No
RETAIN_ALIASES=No
TC_ENABLED=Internal
TC_EXPERT=No
CLEAR_TC=Yes
MARK_IN_FORWARD_CHAIN=No
CLAMPMSS=Yes
ROUTE_FILTER=No
DETECT_DNAT_IPADDRS=No
MUTEX_TIMEOUT=60
ADMINISABSENTMINDED=Yes
BLACKLISTNEWONLY=Yes
DELAYBLACKLISTLOAD=No
MODULE_SUFFIX=
DISABLE_IPV6=No
BRIDGING=No
DYNAMIC_ZONES=No
PKTTYPE=Yes
NULL_ROUTE_RFC1918=No
MACLIST_TABLE=filter
MACLIST_TTL=
SAVE_IPSETS=No
MAPOLDACTIONS=No
FASTACCEPT=No
IMPLICIT_CONTINUE=No
HIGH_ROUTE_MARKS=No
USE_ACTIONS=Yes
OPTIMIZE=1
EXPORTPARAMS=No
EXPAND_POLICIES=Yes
KEEP_RT_TABLES=No
DELETE_THEN_ADD=Yes
MULTICAST=No
DONT_LOAD=
AUTO_COMMENT=Yes
MANGLE_ENABLED=Yes
USE_DEFAULT_RT=No
RESTORE_DEFAULT_ROUTE=Yes
AUTOMAKE=No
WIDE_TC_MARKS=Yes
###############################################################################
# P A C K E T D I S P O S I T I O
N
###############################################################################
BLACKLIST_DISPOSITION=DROP
MACLIST_DISPOSITION=REJECT
TCP_FLAGS_DISPOSITION=DROP
#LAST LINE -- DO NOT REMOVE
I am loathe to upgrade for the sake of upgrading, as things have previously
gone wrong, and other than this (which is atm rather a big problem) everything
else is operating ok.
Hoping someone might see a hole in my config as to why the arp'd system cannot
reach the external network, or be reached.
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