Provided by: shorewall-common_4.2.10-1_all bug


       zones - Shorewall zone declaration file




       The /etc/shorewall/zones file declares your network zones. You specify
       the hosts in each zone through entries in /etc/shorewall/interfaces or

       The columns in the file are as follows.

       ZONE - zone[:parent-zone[,parent-zone]...]
           Name of the zone. The names "all", "none", "SOURCE" and "DEST" are
           reserved and may not be used as zone names. The maximum length of a
           zone name is determined by the setting of the LOGFORMAT option in
           shorewall.conf[1](5). With the default LOGFORMAT, zone names can be
           at most 5 characters long: The maximum length of an iptables log
           prefix is 29 bytes. As explained in shorewall.conf[1] (5), the
           default LOGPREFIX formatting string is “Shorewall:%s:%s:” where the
           first %s is replaced by the chain name and the second is replaced
           by the disposition.

           ·   The default formatting string has 12 fixed characters
               ("Shorewall" and three colons).

           ·   The longest of the standard dispositions are ACCEPT and REJECT
               which have 6 characters each.

           ·   The canonical name for the chain containing the rules for
               traffic going from zone 1 to zone 2 is "<zone 1>2<zone 2>".

           ·   So if M is the maximum zone name length, such chains can have
               length 2*M + 1.

                   12 + 6 + 2*M + 1 = 29 which reduces to

                   2*M = 29 - 12 - 6 - 1 = 10 or

                   M = 5
           The order in which Shorewall matches addresses from packets to
           zones is determined by the order of zone declarations. Where a zone
           is nested in one or more other zones, you may either ensure that
           the nested zone precedes its parents in this file, or you may
           follow the (sub)zone name by ":" and a comma-separated list of the
           parent zones. The parent zones must have been declared in earlier
           records in this file. See shorewall-nesting[2](5) for additional


               #ZONE     TYPE     OPTIONS         IN OPTIONS        OUT OPTIONS
               a         ipv4
               b         ipv4
               c:a,b     ipv4
           Currently, Shorewall uses this information to reorder the zone list
           so that parent zones appear after their subzones in the list. The
           IMPLICIT_CONTINUE option in shorewall.conf[1](5) can also create
           implicit CONTINUE policies to/from the subzone.

           In the future, Shorewall may make additional use of nesting


               This is the standard Shorewall zone type and is the default if
               you leave this column empty or if you enter "-" in the column.
               Communication with some zone hosts may be encrypted. Encrypted
               hosts are designated using the ´ipsec´option in

               Communication with all zone hosts is encrypted. Your kernel and
               iptables must include policy match support.

               Designates the firewall itself. You must have exactly one
               ´firewall´ zone. No options are permitted with a ´firewall´
               zone. The name that you enter in the ZONE column will be stored
               in the shell variable $FW which you may use in other
               configuration files to designate the firewall zone.

           bport (or bport4)
               (Shorewall-perl only) The zone is associated with one or more
               ports on a single bridge.

       OPTIONS, IN OPTIONS and OUT OPTIONS - [option[,option]...]
           A comma-separated list of options. With the exception of the mss
           option, these only apply to TYPE ipsec zones.

               where number is specified using setkey(8) using the
               ´unique:number option for the SPD level.

               where number is the SPI of the SA used to encrypt/decrypt

               IPSEC Encapsulation Protocol

               sets the MSS field in TCP packets. If you supply this option,
               you should also set FASTACCEPT=No in shorewall.conf[1](5) to
               insure that both the SYN and SYN,ACK packets have their MSS
               field adjusted.

               IPSEC mode

               only available with mode=tunnel

               only available with mode=tunnel

               Means that packets must match all rules.

               Separates rules; can only be used with strict

           The options in the OPTIONS column are applied to both incoming and
           outgoing traffic. The IN OPTIONS are applied to incoming traffic
           (in addition to OPTIONS) and the OUT OPTIONS are applied to
           outgoing traffic.

           If you wish to leave a column empty but need to make an entry in a
           following column, use "-".




       shorewall(8), shorewall-accounting(5), shorewall-actions(5),
       shorewall-blacklist(5), shorewall-hosts(5), shorewall-interfaces(5),
       shorewall-ipsec(5), shorewall-maclist(5), shorewall-masq(5),
       shorewall-nat(5), shorewall-nesting(8), shorewall-netmap(5),
       shorewall-params(5), shorewall-policy(5), shorewall-providers(5),
       shorewall-proxyarp(5), shorewall-route_rules(5),
       shorewall-routestopped(5), shorewall-rules(5), shorewall.conf(5),
       shorewall-tcclasses(5), shorewall-tcdevices(5), shorewall-tcrules(5),
       shorewall-tos(5), shorewall-tunnels(5)


        1. shorewall.conf

        2. shorewall-nesting

        3. shorewall-hosts

                                  06/18/2009                SHOREWALL-ZONES(5)