Provided by: shorewall_4.4.26.1-1_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 /etc/shorewall/hosts.

       The columns in the file are as follows (where the column name is followed by a different
       name in parentheses, the different name is used in the alternate specification syntax).

       ZONE - zone[:parent-zone[,parent-zone]...]
           Name of the zone. Must start with a letter and consist of letters, digits or '_'. The
           names "all", "none", "any", "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

           ·   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>" or "<zone 1>-<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 information.


               #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.

           Where an ipsec zone is explicitly included as a child of an ipv4 zone, the ruleset
           allows CONTINUE policies (explicit or implicit) to work as expected.

           In the future, Shorewall may make additional use of nesting information.


               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

           ipsec (or ipsec4)
               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)
               The zone is associated with one or more ports on a single bridge.

               Added in Shorewall 4.4.11 Beta 2 - A zone composed of Linux-vserver guests. The
               zone contents must be defined in shorewall-hosts[3] (5).

               Vserver zones are implicitly handled as subzones of the firewall zone.

       OPTIONS, IN OPTIONS and OUT OPTIONS (options, in_options, out_options) -
           A comma-separated list of options. With the exception of the mss and blacklist
           options, these only apply to TYPE ipsec zones.

               Added in Shorewall 4.4.13. Deprecated in Shorewall 4.4.25 and later in favor of
               rules in the BLACKLIST section of shorewall-rules[4] (5) or in
               shorewall-blrules[5] (5). May not be specified for firewall or vserver zones.

               When specified in the IN_OPTIONS column, causes all traffic from this zone to be
               passed against the src entries in shorewall-blacklist[6](5).

               When specified in the OUT_OPTIONS column, causes all traffic to this zone to be
               passed against the dst entries in shorewall-blacklist[6](5).

               Specifying this option in the OPTIONS column is equivalent to entering it in both
               of the IN_OPTIONS and OUT_OPTIONS column.

               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 packets.

               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-ipsets(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-secmarks(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

        4. shorewall-rules

        5. shorewall-blrules

        6. horewall-blacklist

[FIXME: source]                             12/13/2011                         SHOREWALL-ZONES(5)