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Connection tracking

Connection tracking

Provides inspection of packet's "state"
A packet can be tested in a specific context

The term connection could be thought to indicate that it only relates to TOP traffic, because TCP is connection based. However this is not the case, and the connection tracking capability also applies to (connectioniess) UDP traffic. Instead of thinking in terms of connections (because it suggests TCP style

notions of what constitutes a connection, it is more appropriate to think in terms of exchanges of packets, Next filter understands how exchanges are related to the state, or relationship of each packet to a given session.

When connection tracking is not employed, it is usually necessary to open up high ports fairly indiscriminately to provide for return packets. With connection tracking, this approach can be avoided.

Although connection tracking makes the kernel work harder, it can often be faster overall because after a

connection is established, the chain traversal the number of rules tested in a chain before a match for remaining packets in the same connection can be minimized.

USing connection tracking makes for larger memory use. These connections are stored in proc for use by the kernel, thus these connections are stored in RAM. Some of these files are: proc net

 Connection Tracking, continued 

Connection tracking modules . ip conntrack  ftp

ip conntrack tltp ip nat ftp
ip nat tftp (and others)

 etc sySconf ig iĆ©tiables conf ig

ck the FTP There are several modules that can track a connection. For Instance ip conntrack ftp wull tra

 will connection and will automatically open the higher ports that It needs through the firewall. Ip nat ftp modify FTP packets for computers behind a NAT.

The etc sys config ip tables config file can automatically load these modules using the

IP TABLES MODULES variable. This variable takes a space separated list of modules to load. For example

IP TABLES MODULES ip conntrack tftp ip nat ftp

it will load these modules. Other notable variables include mgianeasme SilsltenglL STOP and IP TABLES_SAVE_ON_RESTART.


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