## Name

hosts — shorewall6 file

## Synopsis

`/etc/shorewall6/hosts`

## Description

This file is used to define zones in terms of subnets and/or individual IP addresses. Most simple setups don't need to (should not) place anything in this file.

The order of entries in this file is not significant in determining zone composition. Rather, the order that the zones are declared in shorewall6-zones(5) determines the order in which the records in this file are interpreted.

### Warning

The only time that you need this file is when you have more than one zone connected through a single interface.

### Warning

If you have an entry for a zone and interface in shorewall6-interfaces(5) then do not include any entries in this file for that same (zone, interface) pair.

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-name

  The name of a zone declared in shorewall6-zones(5). You may not list the firewall zone in this column.

HOST(S) (hosts)- interface:{`address-or-range`[,`address-or-range`]...|+`ipset`|`dynamic`}[`exclusion`]

  The name of an interface defined in the shorewall6-interfaces(5) file followed by a colon (":") and a comma-separated list whose elements are either:

  1. The IPv6 `address` of a host.

  2. A network in CIDR format.

  3. An IP address range of the form [low.address]-[high.address]. Your kernel and ip6tables must have iprange match support.

  4. The name of an ipset.

  5. The word `dynamic` which makes the zone dynamic in that you can use the shorewall add and shorewall delete commands to change to composition of the zone. This capability was added in Shorewall 4.4.21.

  > You may also exclude certain hosts through use of an exclusion (see shorewall6-exclusion(5).

OPTIONS - [option[,option]...]

  An optional comma-separated list of options from the following list. The order in which you list the options is not significant but the list must have no embedded white-space.

  blacklist

    Check packets arriving on this port against the shorewall6-blacklist(5) file.

  ipsec

    The zone is accessed via a kernel 2.6 ipsec SA. Note that if the zone named in the ZONE column is specified as an IPSEC zone in the shorewall6-zones(5) file then you do NOT need to specify the 'ipsec' option here.

  mss=`mss`

    Added in Shorewall 4.5.2. When present, causes the TCP mss for new connections to/from the hosts given in the HOST(S) column to be clamped at the specified `mss`.

  routeback

    shorewall6 should set up the infrastructure to pass packets from this/these address(es) back to themselves. This is necessary if hosts in this group use the services of a transparent proxy that is a member of the group or if DNAT is used to send requests originating from this group to a server in the group.

  tcpflags

    Packets arriving from these hosts are checked for certain illegal combinations of TCP flags. Packets found to have such a combination of flags are handled according to the setting of TCP_FLAGS_DISPOSITION after having been logged according to the setting of TCP_FLAGS_LOG_LEVEL.

## FILES

/etc/shorewall6/hosts

## See ALSO

http://www.shorewall.net/configuration_file_basics.htm#Pairs

shorewall6(8), shorewall6-accounting(5), shorewall6-actions(5), shorewall6-blacklist(5), shorewall6-interfaces(5), shorewall6-maclist(5), shorewall6-netmap(5),shorewall6-params(5), shorewall6-policy(5), shorewall6-providers(5), shorewall6-rtrules(5), shorewall6-routestopped(5), shorewall6-rules(5), shorewall6.conf(5), shorewall6-secmarks(5), shorewall6-tcclasses(5), shorewall6-tcdevices(5), shorewall6-mangle(5), shorewall6-tos(5), shorewall6-tunnels(5), shorewall-zones(5)