Книга: Linux Network Administrator Guide, Second Edition

The ipchains Utility

The ipchains Utility

Just as for the ipfwadm utility, the ipchains utility can be somewhat baffling to use at first. It provides all of the flexibility of ipfwadm with a simplified command syntax, and additionally provides a "chaining" mechanism that allows you to manage multiple rulesets and link them together. We'll cover rule chaining in a separate section near the end of the chapter, because for most situations it is an advanced concept.

The ipchains command appears in most Linux distributions based on the 2.2 kernels. If you want to compile it yourself, you can find the source package from its developer's site at http://www.rustcorp.com/linux/ipchains/. Included in the source package is a wrapper script called ipfwadm-wrapper that mimics the ipfwadm command, but actually invokes the ipchains command. Migration of an existing firewall configuration is much more painless with this addition.

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