Книга: Linux Network Administrator Guide, Second Edition

Setting Timing Parameters for IP Masquerade

Setting Timing Parameters for IP Masquerade

When each new connection is established, the IP masquerade software creates an association in memory between each of the hosts involved in the connection. You can view these associations at any time by looking at the /proc/net/ip_masquerade file. These associations will timeout after a period of inactivity, though.

You can set the timeout values using the ipfwadm command. The general syntax for this is:

ipfwadm -M -s ‹tcp› ‹tcpfin› ‹udp

and for the ipchains command it is:

ipchains -M -S ‹tcp› ‹tcpfin› ‹udp

The iptables implementation uses much longer default timers and does not allow you to set them.

Each of these values represents a timer used by the IP masquerade software and are in units of seconds. The following table summarizes the timers and their meanings:

Name Description
tcp TCP session timeout. How long a TCP connection may remain idle before the association for it is removed.
tcpfin TCP timeout after FIN. How long an association will remain after a TCP connection has been disconnected.
udp UDP session timeout. How long a UDP connection may remain idle before the association for it is removed. 

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