Книга: Linux Network Administrator Guide, Second Edition

Backward Compatability with ipfwadm and ipchains

Backward Compatability with ipfwadm and ipchains

The remarkable flexibility of Linux netfilter is illustrated by its ability to emulate the ipfwadm and ipchains interfaces. Emulation makes transition to the new generation of firewall software a little easier.

The two netfilter kernel modules called ipfwadm.o and ipchains.o provide backward compatibility for ipfwadm and ipchains. You may load only one of these modules at a time, and use one only if the ip_tables.o module is not loaded. When the appropriate module is loaded, netfilter works exactly like the former firewall implementation.

netfilter mimics the ipchains interface with the following commands:

rmmod ip_tables
modprobe ipchains
ipchains

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