Linux 2.4 Packet Filtering HOWTO: Using ipchains and ipfwadm

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## 8. Using ipchains and ipfwadm

There are modules in the netfilter distribution called ipchains.o and ipfwadm.o. Insert one of these in your kernel (NOTE: they are incompatible with ip_tables.o!). Then you can use ipchains or ipfwadm just like the good old days.

This will be supported for some time yet. I think a reasonable formula is 2 * [notice of replacement - initial stable release], beyond the date that a stable release of the replacement is available.

This means that for ipfwadm, the end of support is:

> `

>     2 * [October 1997 (2.1.102 release) - March 1995 (ipfwadm 1.0)]
>             + January 1999 (2.2.0 release)
>         = March 2004.

> `

This means that for ipchains, the end of support is (FIXME: get real dates):

> `

>     2 * [August 1999 (2.3.15 release) - October 1997 (2.2.0 release)]
>             + July 2000 (2.4.0 release?)
>         = March 2004.

> `

So you don't have to worry until 2004.

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