SHOREWALL-HOSTS(5)SHOREWALL-HOSTS(5)NAME
hosts - Shorewall file
SYNOPSIS
/etc/shorewall/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
shorewall-zones[1](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
shorewall-interfaces[2](5) then do not include any entries in this file
for that same (zone, interface) pair.
The columns in the file are as follows.
ZONE - zone-name
The name of a zone declared in shorewall-zones[1](5). You may not
list the firewall zone in this column.
HOST(S)-
interface:{[{address-or-range[,address-or-range]...|+ipset}[exclusion]
The name of an interface defined in the shorewall-interfaces[2](5)
file followed by a colon (":") and a comma-separated list whose
elements are either:
1. The IP 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 iptables must have iprange match support.
4. The name of an ipset.
You may also exclude certain hosts through use of an exclusion
(see shorewall-exclusion[3](5).
OPTIONS (Optional) - [option[,option]...]
A 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.
maclist
Connection requests from these hosts are compared against the
contents of shorewall-maclist[4](5). If this option is
specified, the interface must be an ethernet NIC or equivalent
and must be up before Shorewall is started.
routeback
Shorewall 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.
blacklist
This option only makes sense for ports on a bridge.
Check packets arriving on this port against the
shorewall-blacklist[5](5) file.
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.
nosmurfs
This option only makes sense for ports on a bridge.
Filter packets for smurfs (packets with a broadcast address as
the source).
Smurfs will be optionally logged based on the setting of
SMURF_LOG_LEVEL in shorewall.conf[6](5). After logging, the
packets are dropped.
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 shorewall-zones[1](5) file then you do NOT need to
specify the ´ipsec´ option here.
broadcast
(Only supported by Shorewall-perl). Used when you want to
include limited broadcasts (destination IP address
255.255.255.255) from the firewall to this zone. Only necessary
when:
1. The network specified in the HOST(S) column does not
include 255.255.255.255.
2. The zone does not have an entry for this interface in
shorewall-interfaces[2](5).
destonly
(Only supported by Shorewall-perl). Normally used with the
Multi-cast IP address range (224.0.0.0/4). Specifies that
traffic will be sent to the specified net(s) but that no
traffic will be received from the net(s).
EXAMPLES
Example 1
The firewall runs a PPTP server which creates a ppp interface for
each remote client. The clients are assigned IP addresses in the
network 192.168.3.0/24 and in a zone named ´vpn´.
#ZONE HOST(S) OPTIONS
vpn ppp+:192.168.3.0/24
If you are running a Shorewall version prior to 4.1.4, it is
especially recommended to define such a zone using this file rather
than shorewall-interfaces[2](8) if there is another zone that uses
a fixed PPP interface (for example, if the ´net´ zone always
interfaces through ppp0). See shorewall-nesting[7](8) for
additional information.
FILES
/etc/shorewall/hosts
SEE ALSOshorewall(8), shorewall-accounting(5), shorewall-actions(5),
shorewall-blacklist(5), shorewall-interfaces(5), shorewall-ipsec(5),
shorewall-maclist(5), shorewall-masq(5), shorewall-nat(5),
shorewall-nesting(5), 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), shorewall-zones(5)NOTES
1. shorewall-zones
shorewall-zones.html
2. shorewall-interfaces
shorewall-interfaces.html
3. shorewall-exclusion
shorewall-exclusion.html
4. shorewall-maclist
shorewall-maclist.html
5. shorewall-blacklist
shorewall-blacklist.html
6. shorewall.conf
shorewall.conf.html
7. shorewall-nesting
shorewall-nesting.html
09/05/2009 SHOREWALL-HOSTS(5)
