This is a minor release of Shorewall. Problems Corrected: 1) A problem seen on RH7.3 systems where Shorewall encountered start errors when started using the "service" mechanism has been worked around. 2) Where a list of IP addresses appears in the DEST column of a DNAT[-] rule, Shorewall incorrectly created multiple DNAT rules in the nat table (one for each element in the list). Shorewall now correctly creates a single DNAT rule with multiple "--to-destination" clauses. New Features: 1) A 'newnotsyn' interface option has been added. This option may be specified in /etc/shorewall/interfaces and overrides the setting NEWNOTSYN=No for packets arriving on the associated interface. 2) The means for specifying a range of IP addresses in /etc/shorewall/masq to use for SNAT is now documented. ADD_SNAT_ALIASES=Yes is enabled for address ranges. 3) Shorewall can now add IP addresses to subnets other than the first one on an interface. 4) DNAT[-] rules may now be used to load balance (round-robin) over a set of servers. Up to 256 servers may be specified in a range of addresses given as -. Example: DNAT net loc:192.168.10.2-192.168.10.5 tcp 80 Note that this capability has previously been available using a combination of a DNAT- rule and one or more ACCEPT rules. That technique is still preferable for load-balancing over a large number of servers (> 16) since specifying a range in the DNAT rule causes one filter table ACCEPT rule to be generated for each IP address in the range. 5) The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT configuration options have been removed and have been replaced by code that detects whether these capabilities are present in the current kernel. The output of the start, restart and check commands have been enhanced to report the outcome: Shorewall has detected the following iptables/netfilter capabilities: NAT: Available Packet Mangling: Available Multi-port Match: Available Verifying Configuration... 6) Support for the Connection Tracking Match Extension has been added. This extension is available in recent kernel/iptables releases and allows for rules which match against elements in netfilter's connection tracking table. Shorewall automatically detects the availability of this extension and reports its availability in the output of the start, restart and check commands. Shorewall has detected the following iptables/netfilter capabilities: NAT: Available Packet Mangling: Available Multi-port Match: Available Connection Tracking Match: Available Verifying Configuration... If this extension is available, the ruleset generated by Shorewall is changed in the following ways: a) To handle 'norfc1918' filtering, Shorewall will not create chains in the mangle table but will rather do all 'norfc1918' filtering in the filter table (rfc1918 chain). b) Recall that Shorewall DNAT rules generate two netfilter rules; one in the nat table and one in the filter table. If the Connection Tracking Match Extension is available, the rule in the filter table is extended to check that the original destination address was the same as specified (or defaulted to) in the DNAT rule. 7) The shell used to interpret the firewall script (/usr/share/shorewall/firewall) may now be specified using the SHOREWALL_SHELL parameter in shorewall.conf.