Home / ubuntu / Questions / 316990
Accepted
Tarun
Asked: 2013-07-07 00:10:44 +0800 CST

Create table in iptables

  • 772

I want to create a custom table using iptables so that I can add my custom chains in it. But I doesn't see any option to do that. I tried to search for it but didnt found anything. Please Help.

iptables

2 Answers

  1. Best Answer

    I think you are looking for creating a chain, not a table.

       -N, --new-chain chain
          Create a new user-defined chain by the given name.  There must be no target of that name already.

    Example (-t filter is implied):

    iptables -N Services
iptables -A INPUT -j Services
iptables -A Services -m tcp -p tcp --dport 80 -j ACCEPT

    Tables can be selected with the -t option:

    iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

    And if you are using iptables-restore, the above two rules can be combined to:

    *nat
-A POSTROUTING -j MASQUERADE
COMMIT

*filter
:Services -
-A INPUT -j Services
-A Services -m tcp -p tcp --dport 80 -j ACCEPT
COMMIT
    • 19

  2. Creating a table is done at the kernel level; normally there is no need to create a new one unless one is adding to the kernel's TCP/IP capabilities.

    What you likely want to do is create a new chain in one of the existing tables, which is done with the -N flag.

    • 6