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Linux Network Administrator Guide, Second EditionSome of them control rather esoteric features of the IP chains software: -Pb Causes the command to generate two rules. One rule matches the parameters supplied, and the other rule added matches the corresponding parameters in the reverse direction. -Pv Causes ipchains to be verbose in its output. It will supply more information. -Pn Causes ipchains to display IP address and ports as numbers without attempting to resolve them to their corresponding names. -Pl Enables kernel logging of matching datagrams. Any datagram that matches the rule will be logged by the kernel using its printk() function, which is usually handled by the sysklogd program and written to a log file. This is useful for making unusual datagrams visible. -Po[maxsize] Causes the IP chains software to copy any datagrams matching the rule to the userspace "netlink" device. The maxsize argument limits the number of bytes from each datagram that are passed to the netlink device. This option is of most use to software developers, but may be exploited by software packages in the future. -Pm markvalue Causes matching datagrams to be marked with a value ...» |
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