shorewall-hosts.5

sharewall is very good

.\"     Title: shorewall-hosts
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.74.0 <http://docbook.sf.net/>
.\"      Date: 03/19/2009
.\"    Manual: [FIXME: manual]
.\"    Source: [FIXME: source]
.\"  Language: English
.\"
.TH "SHOREWALL\-HOSTS" "5" "03/19/2009" "[FIXME: source]" "[FIXME: manual]"
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.SH "Name"
hosts \- Shorewall file
.SH "Synopsis"
.fam C
.HP \w'\fB/etc/shorewall/hosts\fR\ 'u
\fB/etc/shorewall/hosts\fR
.fam
.SH "Description"
.PP
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\&.
.PP
The order of entries in this file is not significant in determining zone composition\&. Rather, the order that the zones are declared in
\m[blue]\fBshorewall\-zones\fR\m[]\&\s-2\u[1]\d\s+2(5) determines the order in which the records in this file are interpreted\&.
.if n \{\
.sp
.\}
.RS 4
.BM yellow
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBWarning\fR
.ps -1
.br
.PP
The only time that you need this file is when you have more than one zone connected through a single interface\&.
.sp .5v
.EM yellow
.RE
.if n \{\
.sp
.\}
.RS 4
.BM yellow
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBWarning\fR
.ps -1
.br
.PP
If you have an entry for a zone and interface in
\m[blue]\fBshorewall\-interfaces\fR\m[]\&\s-2\u[2]\d\s+2(5) then do not include any entries in this file for that same (zone, interface) pair\&.
.sp .5v
.EM yellow
.RE
.PP
The columns in the file are as follows\&.
.PP
\fBZONE\fR \- \fIzone\-name\fR
.RS 4
The name of a zone declared in
\m[blue]\fBshorewall\-zones\fR\m[]\&\s-2\u[1]\d\s+2(5)\&. You may not list the firewall zone in this column\&.
.RE
.PP
\fBHOST(S)\fR \- \fIinterface\fR:{[{\fIaddress\-or\-range\fR[\fB,\fR\fIaddress\-or\-range\fR]\&.\&.\&.|\fB+\fR\fIipset\fR}[\fIexclusion\fR]
.RS 4
The name of an interface defined in the
\m[blue]\fBshorewall\-interfaces\fR\m[]\&\s-2\u[2]\d\s+2(5) file followed by a colon (":") and a comma\-separated list whose elements are either:
.sp
.RS 4
.ie n \{\
\h'-04' 1.\h'+01'\c
.\}
.el \{\
.sp -1
.IP "  1." 4.2
.\}
The IP
\fIaddress\fR
of a host\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04' 2.\h'+01'\c
.\}
.el \{\
.sp -1
.IP "  2." 4.2
.\}
A network in CIDR format\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04' 3.\h'+01'\c
.\}
.el \{\
.sp -1
.IP "  3." 4.2
.\}
An IP address range of the form
\fIlow\&.address\fR\-\fIhigh\&.address\fR\&. Your kernel and iptables must have iprange match support\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04' 4.\h'+01'\c
.\}
.el \{\
.sp -1
.IP "  4." 4.2
.\}
The name of an
\fIipset\fR\&.
.RE
.RS 4
You may also exclude certain hosts through use of an
\fIexclusion\fR
(see
\m[blue]\fBshorewall\-exclusion\fR\m[]\&\s-2\u[3]\d\s+2(5)\&.
.RE
.PP
OPTIONS (Optional) \- [\fIoption\fR[\fB,\fR\fIoption\fR]\&.\&.\&.]
.RS 4
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\&.
.PP
\fBmaclist\fR
.RS 4
Connection requests from these hosts are compared against the contents of
\m[blue]\fBshorewall\-maclist\fR\m[]\&\s-2\u[4]\d\s+2(5)\&. If this option is specified, the interface must be an ethernet NIC or equivalent and must be up before Shorewall is started\&.
.RE
.PP
\fBrouteback\fR
.RS 4
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\&.
.RE
.PP
\fBblacklist\fR
.RS 4
This option only makes sense for ports on a bridge\&.
.sp
Check packets arriving on this port against the
\m[blue]\fBshorewall\-blacklist\fR\m[]\&\s-2\u[5]\d\s+2(5) file\&.
.RE
.PP
\fBtcpflags\fR
.RS 4
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\&.
.RE
.PP
\fBnosmurfs\fR
.RS 4
This option only makes sense for ports on a bridge\&.
.sp
Filter packets for smurfs (packets with a broadcast address as the source)\&.
.sp
Smurfs will be optionally logged based on the setting of SMURF_LOG_LEVEL in
\m[blue]\fBshorewall\&.conf\fR\m[]\&\s-2\u[6]\d\s+2(5)\&. After logging, the packets are dropped\&.
.RE
.PP
\fBipsec\fR
.RS 4
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
\m[blue]\fBshorewall\-zones\fR\m[]\&\s-2\u[1]\d\s+2(5) file then you do NOT need to specify the \'ipsec\' option here\&.
.RE
.PP
broadcast
.RS 4
(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:
.sp
.RS 4
.ie n \{\
\h'-04' 1.\h'+01'\c
.\}
.el \{\
.sp -1
.IP "  1." 4.2
.\}
The network specified in the HOST(S) column does not include 255\&.255\&.255\&.255\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04' 2.\h'+01'\c
.\}
.el \{\
.sp -1
.IP "  2." 4.2
.\}
The zone does not have an entry for this interface in
\m[blue]\fBshorewall\-interfaces\fR\m[]\&\s-2\u[2]\d\s+2(5)\&.
.RE
.RE
.PP
destonly
.RS 4
(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)\&.
.RE
.RE
.SH "Examples"
.PP
Example 1
.RS 4
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\'\&.
.sp
.if n \{\
.RS 4
.\}
.fam C
.ps -1
.nf
.BB lightgray
#ZONE       HOST(S)               OPTIONS
vpn         ppp+:192\&.168\&.3\&.0/24
.EB lightgray
.fi
.fam
.ps +1
.if n \{\
.RE
.\}
.sp
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
\m[blue]\fBshorewall\-interfaces\fR\m[]\&\s-2\u[2]\d\s+2(8) if there is another zone that uses a fixed PPP interface (for example, if the \'net\' zone always interfaces through ppp0)\&. See
\m[blue]\fBshorewall\-nesting\fR\m[]\&\s-2\u[7]\d\s+2(8) for additional information\&.
.RE
.SH "FILES"
.PP
/etc/shorewall/hosts
.SH "See ALSO"
.PP
shorewall(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)
.SH "Notes"
.IP " 1." 4
shorewall-zones
.RS 4
\%http://www.shorewall.net/manpages/shorewall-zones.html
.RE
.IP " 2." 4
shorewall-interfaces
.RS 4
\%http://www.shorewall.net/manpages/shorewall-interfaces.html
.RE
.IP " 3." 4
shorewall-exclusion
.RS 4
\%http://www.shorewall.net/manpages/shorewall-exclusion.html
.RE
.IP " 4." 4
shorewall-maclist
.RS 4
\%http://www.shorewall.net/manpages/shorewall-maclist.html
.RE
.IP " 5." 4
shorewall-blacklist
.RS 4
\%http://www.shorewall.net/manpages/shorewall-blacklist.html
.RE
.IP " 6." 4
shorewall.conf
.RS 4
\%http://www.shorewall.net/manpages/shorewall.conf.html
.RE
.IP " 7." 4
shorewall-nesting
.RS 4
\%http://www.shorewall.net/manpages/shorewall-nesting.html
.RE