1SHOREWALL-HOSTS(5) Configuration Files SHOREWALL-HOSTS(5)
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6 hosts - Shorewall file
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9 /etc/shorewall[6]/hosts
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12 This file is used to define zones in terms of subnets and/or individual
13 IP addresses. Most simple setups don't need to (should not) place
14 anything in this file.
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16 The order of entries in this file is not significant in determining
17 zone composition. Rather, the order that the zones are declared in
18 shorewall-zones[1](5) determines the order in which the records in this
19 file are interpreted.
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21 Warning
22 The only time that you need this file is when you have more than
23 one zone connected through a single interface.
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25 Warning
26 If you have an entry for a zone and interface in
27 shorewall-interfaces[2](5) then do not include any entries in this
28 file for that same (zone, interface) pair.
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30 The columns in the file are as follows.
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32 ZONE - zone-name
33 The name of a zone declared in shorewall-zones[1](5). You may not
34 list the firewall zone in this column.
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36 HOST(S) -
37 interface:{[{address-or-range[,address-or-range]...|+ipset|dynamic}[exclusion]
38 The name of an interface defined in the shorewall-interfaces[2](5)
39 file followed by a colon (":") and a comma-separated list whose
40 elements are either:
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42 1. The IP address of a host.
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44 2. A network in CIDR format.
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46 3. An IP address range of the form low.address-high.address. Your
47 kernel and iptables must have iprange match support.
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49 4. The name of an ipset.
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51 5. The word dynamic which makes the zone dynamic in that you can
52 use the shorewall add and shorewall delete commands to change
53 to composition of the zone.
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55 You may also exclude certain hosts through use of an exclusion (see
56 shorewall-exclusion[3](5).
57
58 OPTIONS (Optional) - [option[,option]...]
59 A comma-separated list of options from the following list. The
60 order in which you list the options is not significant but the list
61 must have no embedded white-space.
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63 blacklist
64 Check packets arriving on this port against the
65 shorewall-blacklist[4](5) file.
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67 broadcast
68 Used when you want to include limited broadcasts (destination
69 IP address 255.255.255.255) from the firewall to this zone.
70 Only necessary when:
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72 1. The network specified in the HOST(S) column does not
73 include 255.255.255.255.
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75 2. The zone does not have an entry for this interface in
76 shorewall-interfaces[2](5).
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78 destonly
79 Normally used with the Multi-cast IP address range
80 (224.0.0.0/4). Specifies that traffic will be sent to the
81 specified net(s) but that no traffic will be received from the
82 net(s).
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84 ipsec
85 The zone is accessed via a kernel 2.6 ipsec SA. Note that if
86 the zone named in the ZONE column is specified as an IPSEC zone
87 in the shorewall-zones[1](5) file then you do NOT need to
88 specify the 'ipsec' option here.
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90 maclist
91 Connection requests from these hosts are compared against the
92 contents of shorewall-maclist[5](5). If this option is
93 specified, the interface must be an Ethernet NIC or equivalent
94 and must be up before Shorewall is started.
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96 mss=mss
97 Added in Shorewall 4.5.2. When present, causes the TCP mss for
98 new connections to/from the hosts given in the HOST(S) column
99 to be clamped at the specified mss.
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101 nosmurfs
102 This option only makes sense for ports on a bridge.
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104 Filter packets for smurfs (packets with a broadcast address as
105 the source).
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107 Smurfs will be optionally logged based on the setting of
108 SMURF_LOG_LEVEL in shorewall.conf[6](5). After logging, the
109 packets are dropped.
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111 routeback
112 Shorewall should set up the infrastructure to pass packets from
113 this/these address(es) back to themselves. This is necessary if
114 hosts in this group use the services of a transparent proxy
115 that is a member of the group or if DNAT is used to send
116 requests originating from this group to a server in the group.
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118 tcpflags
119 Packets arriving from these hosts are checked for certain
120 illegal combinations of TCP flags. Packets found to have such a
121 combination of flags are handled according to the setting of
122 TCP_FLAGS_DISPOSITION after having been logged according to the
123 setting of TCP_FLAGS_LOG_LEVEL.
124
126 Example 1
127 The firewall runs a PPTP server which creates a ppp interface for
128 each remote client. The clients are assigned IP addresses in the
129 network 192.168.3.0/24 and in a zone named 'vpn'.
130
131 #ZONE HOST(S) OPTIONS
132 vpn ppp+:192.168.3.0/24
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135 /etc/shorewall/hosts
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137 /etc/shorewall6/hosts
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140 http://www.shorewall.net/configuration_file_basics.htm#Pairs[7]
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142 shorewall(8)
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145 1. shorewall-zones
146 http://www.shorewall.net/manpages/shorewall-zones.html
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148 2. shorewall-interfaces
149 http://www.shorewall.net/manpages/shorewall-interfaces.html
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151 3. shorewall-exclusion
152 http://www.shorewall.net/manpages/shorewall-exclusion.html
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154 4. shorewall-blacklist
155 http://www.shorewall.net/manpages/shorewall-blacklist.html
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157 5. shorewall-maclist
158 http://www.shorewall.net/manpages/shorewall-maclist.html
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160 6. shorewall.conf
161 http://www.shorewall.net/manpages/shorewall.conf.html
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163 7. http://www.shorewall.net/configuration_file_basics.htm#Pairs
164 http://www.shorewall.net/configuration_file_basics.htm#Pairs
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168Configuration Files 01/17/2019 SHOREWALL-HOSTS(5)