Shorewall Errata Tom Eastep 2004-03-20 2001-2004 Thomas M. Eastep Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover, and with no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. If you use a Windows system to download a corrected script, be sure to run the script through dos2unix after you have moved it to your Linux system. If you are installing Shorewall for the first time and plan to use the .tgz and install.sh script, you can untar the archive, replace the firewall script in the untarred directory with the one you downloaded below, and then run install.sh. When the instructions say to install a corrected firewall script in /usr/share/shorewall/firewall, you may rename the existing file before copying in the new file. DO NOT INSTALL CORRECTED COMPONENTS ON A RELEASE EARLIER THAN THE ONE THAT THEY ARE LISTED UNDER BELOW. For example, do NOT install the 1.3.9a firewall script if you are running 1.3.7c.
RFC1918 File Here is the most up to date version of the rfc1918 file. This file only applies to Shorewall version 2.0.0 and its bugfix updates. In Shorewall 2.0.1 and later releases, the bogons file lists IP ranges that are reserved by the IANA and the rfc1918 file only lists those three ranges that are reserved by RFC 1918.
Problems in Version 2.0
Shorewall 2.0.0 When using an Action in the ACTIONS column of a rule, you may receive a warning message about the rule being a policy. While this warning may be safely ignored, it can be eliminated by installing the script from the link below. Thanks to Sean Mathews, a long-standing problem with Proxy ARP and IPSEC has been corrected. The first problem has been corrected in Shorewall update 2.0.0a. All of these problems may be corrected by installing this firewall script in /usr/share/shorewall as described above.
Upgrade Issues The upgrade issues have moved to a separate page.
Problem with iptables version 1.2.3 There are a couple of serious bugs in iptables 1.2.3 that prevent it from working with Shorewall. Regrettably, RedHat released this buggy iptables in RedHat 7.2.  I have built a corrected 1.2.3 rpm which you can download here  and I have also built an iptables-1.2.4 rpm which you can download here. If you are currently running RedHat 7.1, you can install either of these RPMs before you upgrade to RedHat 7.2. Update 11/9/2001: RedHat has released an iptables-1.2.4 RPM of their own which you can download from http://www.redhat.com/support/errata/RHSA-2001-144.html.I have installed this RPM on my firewall and it works fine. If you would like to patch iptables 1.2.3 yourself, the patches are available for download. This patch which corrects a problem with parsing of the --log-level specification while this patch corrects a problem in handling the  TOS target. To install one of the above patches: cd iptables-1.2.3/extensions patch -p0 < the-patch-file
Problems with kernels >= 2.4.18 and RedHat iptables Users who use RedHat iptables RPMs and who upgrade to kernel 2.4.18/19 may experience the following:
# shorewall start Processing /etc/shorewall/shorewall.conf ... Processing /etc/shorewall/params ... Starting Shorewall... Loading Modules... Initializing... Determining Zones... Zones: net Validating interfaces file... Validating hosts file... Determining Hosts in Zones... Net Zone: eth0:0.0.0.0/0 iptables: libiptc/libip4tc.c:380: do_check: Assertion `h->info.valid_hooks == (1 << 0 | 1 << 3)' failed. Aborted (core dumped) iptables: libiptc/libip4tc.c:380: do_check: Assertion `h->info.valid_hooks == (1 << 0 | 1 << 3)' failed. Aborted (core dumped)
The RedHat iptables RPM is compiled with debugging enabled but the user-space debugging code was not updated to reflect recent changes in the Netfilter mangle table. You can correct the problem by installing this iptables RPM. If you are already running a 1.2.5 version of iptables, you will need to specify the --oldpackage option to rpm (e.g., iptables -Uvh --oldpackage iptables-1.2.5-1.i386.rpm).
Problems with iptables version 1.2.7 and MULTIPORT=Yes The iptables 1.2.7 release of iptables has made an incompatible change to the syntax used to specify multiport match rules; as a consequence, if you install iptables 1.2.7 you must be running Shorewall 1.3.7a or later or: set MULTIPORT=No in /etc/shorewall/shorewall.conf; or If you are running Shorewall 1.3.6 you may install this firewall script in /usr/lib/shorewall/firewall as described above.
Problems with RH Kernel 2.4.18-10 and NAT /etc/shorewall/nat entries of the following form will result in Shorewall being unable to start: #EXTERNAL       INTERFACE       INTERNAL        ALL INTERFACES          LOCAL 192.0.2.22    eth0    192.168.9.22   yes     yes #LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE Error message is: Setting up NAT... iptables: Invalid argument Terminated The solution is to put no in the LOCAL column. Kernel support for LOCAL=yes has never worked properly and 2.4.18-10 has disabled it. The 2.4.19 kernel contains corrected support under a new kernel configuraiton option; see http://www.shorewall.net/Documentation.htm#NAT.
Problems with RH Kernels after 2.4.20-9 and REJECT (also applies to 2.4.21-RC1) Beginning with errata kernel 2.4.20-13.9, REJECT --reject-with tcp-reset is broken. The symptom most commonly seen is that REJECT rules act just like DROP rules when dealing with TCP. A kernel patch and precompiled modules to fix this problem are available at ftp://ftp1.shorewall.net/pub/shorewall/errata/kernel RedHat have corrected this problem in their 2.4.20-27.x kernels.
Revision History4 1.62004-03-20TEProxy ARP/IPSEC fix.1.62004-03-17TEAction rules are reported as policies.1.52004-02-03TEUpdate for Shorewall 2.0.0.1.42004-01-19TEIPV6 address problems. Make RFC1918 file section more prominent.1.32004-01-14TEConfusing template file in 1.4.91.32004-01-03TEAdded note about REJECT RedHat Kernal problem being corrected.1.22003-12-29TEUpdated RFC1918 file1.12003-12-17TEInitial Conversion to Docbook XML