shorewall6-interfac(5)

NAME

interfaces - shorewall6 interfaces file

SYNOPSIS

/etc/shorewall6/interfaces

DESCRIPTION

The interfaces file serves to define the firewall's network interfaces to shorewall6. The order of entries in this file is not significant in determining zone composition.

The columns in the file are as follows.

ZONE - zone-name: Zone for this interface. Must match the name of a zone declared in /etc/shorewall6/zones. You may not list the firewall zone in this
column.; If the interface serves multiple zones that will be defined in the shorewall6-hosts[1](5) file, you should place "-" in this column.; If there are multiple interfaces to the same zone, you must list
them in separate entries.; Example:

#ZONE INTERFACE BROADCAST
loc eth1 loc eth2
INTERFACE - interface[:port]: Name of interface. Each interface may be listed only once in this
file. You may NOT specify the name of a "virtual" interface (e.g., eth0:0) here; see http://www.shorewall.net/FAQ.htm#faq18; You may use wildcards here by specifying a prefix followed by the
plus sign ("+"). For example, if you want to make an entry that
applies to all PPP interfaces, use 'ppp+'; that would match ppp0,
ppp1, ppp2, ...; Care must be exercised when using wildcards where there is another zone that uses a matching specific interface. See
shorewall6-nesting[2](5) for a discussion of this problem.; Shorewall6 allows '+' as an interface name.; There is no need to define the loopback interface (lo) in this
file.; If a port is given, then the interface must have been defined previously with the bridge option. The OPTIONS column must be empty when a port is given.
UNICAST -: Enter '-' in this column. It is here for compatibility between Shorewall6 and Shorewall.
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 should have no embedded white space.; blacklist
Check packets arriving on this interface against the
shorewall6-blacklist[3](5) file.; bridge
Designates the interface as a bridge.; mss=number
Causes forwarded TCP SYN packets entering or leaving on this
interface to have their MSS field set to the specified number.; optional
When optional is specified for an interface, shorewall6 will be silent when:

o a /proc/sys/net/ipv6/conf/ entry for the interface cannot
be modified.

o The first global IPv6 address of the interface cannot be

obtained.
routeback: If specified, indicates that shorewall6 should include rules
that allow traffic arriving on this interface to be routed back out that same interface. This option is also required when you have used a wildcard in the INTERFACE column if you want to
allow traffic between the interfaces that match the wildcard.
sourceroute[={0|1}]: If this option is not specified for an interface, then
source-routed packets will not be accepted from that interface (sets /proc/sys/net/ipv6/conf/interface/accept_source_route to 1). Only set this option if you know what you are doing. This
might represent a security risk and is not usually needed.; Only those interfaces with the sourceroute option will have their setting changes; the value assigned to the setting will
be the value specified (if any) or 1 if no value is given.; Note
This option does not work with a wild-card interface name (e.g., eth0.+) in the INTERFACE column.
tcpflags: Packets arriving on this interface 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.
proxyndp[={0|1}]: Sets /proc/sys/net/ipv6/conf/interface/proxy_ndp.; Note: This option does not work with a wild-card interface name (e.g., eth0.+) in the INTERFACE column.; Only those interfaces with the proxyndp option will have their setting changed; the value assigned to the setting will be the value specified (if any) or 1 if no value is given.

EXAMPLE

Example 1:: Suppose you have eth0 connected to a DSL modem and eth1 connected
to your local network You have a DMZ using eth2.; Your entries for this setup would look like:

#ZONE INTERFACE UNICAST OPTIONS
net eth0 loc eth1 dmz eth2

FILES

/etc/shorewall6/interfaces

NOTES

1. shorewall6-hosts: shorewall6-hosts.html; 2. shorewall6-nesting
shorewall6-nesting.html; 3. shorewall6-blacklist
shorewall6-blacklist.html

docs.sk

comprehensive documentation repository

See also