iptables multiple source IPs in single rule

Solution 1:

To add multiple sources in a single command I would do this:

iptables -t filter -A INPUT -s,, -j ACCEPT

iptables will automatically translate it into multiple rules.

Solution 2:

The original question is from May 2009, but since May 2011 the Linux kernel has had a feature to address this need called ipset.

Here is an example creating an ipset, adding addresses to it, and then using it in a firewall rule:

ipset -N office365 iphash

ipset -A office365
ipset -A office365
ipset -A office365
ipset -A office365
ipset -A office365
ipset -A office365
ipset -A office365
ipset -A office365
ipset -A office365
ipset -A office365

iptables -A OUTPUT -m set --match-set office365 dst -j ACCEPT

See man iptables and man ipset for more info.

Solution 3:

you can use the iprange module in combination with '--src-range' like for e.x.:

-A INPUT -i eth0 -m iprange --src-range -j ACCEPT

Source: iptables 1.4.7 man page

   This matches on a given arbitrary range of IP addresses.

   [!] --src-range from[-to]
          Match source IP in the specified range.

   [!] --dst-range from[-to]
          Match destination IP in the specified range.

(i know this is like a 4 year old question, but just to answer for anyone who seeks this on the net)

Solution 4:

This is only possible if you can aggregate the source IP's you want into a contiguous range. eg

iptables -A INPUT -s -d -p tcp -j ACCEPT

If you cannot find a common netmask that covers the IP's you want, you'll have to write several identical rules to do what you want.

There are several iptables frameworks around which can deal with the low level of writing the iptables rules, allowing you to define your rules at a more symolic level. Shorewall is a common one that ships with most current linux distributions.

Solution 5:

In addition to the comment of Bòss King, you can also simply specify several addresses seperated with a comma:

[!] -s, --source address[/mask][,...]
      Source specification. Address can be either a network name, a hostname, a network IP address (with /mask), or a plain IP address. Hostnames will be resolved once only, before the rule is submitted to the kernel.  Please note  that  specifying
      any  name  to  be resolved with a remote query such as DNS is a really bad idea.  The mask can be either a network mask or a plain number, specifying the number of 1's at the left side of the network mask.  Thus, a mask of 24 is equivalent to  A "!" argument before the address specification inverts the sense of the address. The flag --src is an alias for this option.  Multiple addresses can be specified, but this will expand to multiple rules (when adding with  -A),
      or will cause multiple rules to be deleted (with -D).