shorewall-hosts
5
hosts
Shorewall file
/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(5) determines the order
in which the records in this file are interpreted.
The only time that you need this file is when you have more than
one zone connected through a single interface.
If you have an entry for a zone and interface in shorewall-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.
ZONE -
zone-name
The name of a zone declared in shorewall-zones(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(5) file
followed by a colon (":") and a comma-separated list whose elements
are either:
The IP address of a
host.
A network in CIDR format.
An IP address range of the form
low.address-high.address.
Your kernel and iptables must have iprange match support.
The name of an ipset.
You may also exclude certain hosts through use of an
exclusion (see shorewall-exclusion(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(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)
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(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(5) file
then you do NOT need to specify the 'ipsec' option
here.
broadcast
Used when you want to include limited broadcasts
(destination IP address 255.255.255.255) from the firewall to
this zone. Only necessary when:
The network specified in the HOST(S) column does not
include 255.255.255.255.
The zone does not have an entry for this interface
in shorewall-interfaces(5).
destonly
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
FILES
/etc/shorewall/hosts
See ALSO
shorewall(8), shorewall-accounting(5), shorewall-actions(5),
shorewall-blacklist(5), shorewall-interfaces(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)