exclusion - Exclude a set of hosts from a definition in a shorewall
The first form of exclusion is used when you wish to exclude one or more
addresses from a definition. An exclamation point is followed by a
comma-separated list of addresses. The addresses may be single host addresses
(e.g., 192.168.1.4) or they may be network addresses in CIDR format (e.g.,
192.168.1.0/24). If your kernel and iptables include iprange support, you may
also specify ranges of ip addresses of the form
No embedded white-space is allowed.
Exclusion can appear after a list of addresses and/or address ranges. In that
case, the final list of address is formed by taking the first list and then
removing the addresses defined in the exclusion.
Beginning in Shorewall 4.4.13, the second form of exclusion is allowed after
in the SOURCE and DEST columns of
/etc/shorewall/rules. It allows you to omit arbitrary zones from the list
generated by those key words.
If you omit a sub-zone and there is an explicit or explicit CONTINUE policy, a
connection to/from that zone can still be matched by the rule generated for a
#SOURCE DEST POLICY
z1 net CONTINUE
z2 net REJECT
#ACTION SOURCE DEST PROTO DPORT
ACCEPT all!z2 net tcp 22
In this case, SSH connections from z2
will be accepted by
the generated z1
to net ACCEPT rule.
In most contexts, ipset names can be used as an address-or-range
Beginning with Shorewall 4.4.14, ipset lists enclosed in +[...] may also be
included (see shorewall-ipsets
 (5)). The semantics of these lists
when used in an exclusion are as follows:
produces a packet match if the packet does not match at least one of the sets.
In other words, it is like NOT match set1 OR NOT match set2 ...
OR NOT match setN.
produces a packet match if the packet does not match any of the sets. In other
words, it is like NOT match set1 AND NOT match set2 ... AND NOT
Example 1 - All IPv4 addresses except 192.168.3.4
Example 2 - All IPv4 addresses except the network 192.168.1.0/24 and the host
Example 3 - All IPv4 addresses except the range 192.168.1.3-192.168.1.12 and the
Example 4 - The network 192.168.1.0/24 except hosts 192.168.1.3 and 192.168.1.9
Example 5 - All parent zones except loc
shorewall(8), shorewall-accounting(5), shorewall-actions(5),
shorewall-blacklist(5), shorewall-hosts(5), shorewall_interfaces(5),
shorewall-ipsets(5), shorewall-maclist(5), shorewall-masq(5),
shorewall-nat(5), shorewall-netmap(5), shorewall-params(5),
shorewall-policy(5), shorewall-providers(5), shorewall-proxyarp(5),
shorewall-rtrules(5), shorewall-routestopped(5), shorewall-rules(5),
shorewall.conf(5), shorewall-secmarks(5), shorewall-tcclasses(5),
shorewall-tcdevices(5), shorewall-mangle(5), shorewall-tos(5),