S, -stats Show the in-kernel connection tracking system statistics. F, -flush Flush the whole given table -C, -count Show the table counter. E, -event Display a real-time event log. U, -update Update an entry from the given table. I, -create Create a new entry from the given table. D, -delete Delete an entry from the given table. L -dump List connection tracking or expectation table -G, -get Search for and show a particular (matching) entry in the given table. Only one of themĬan be specified at any given time. OPTIONSThe options recognized by conntrack can be divided into several differentĬOMMANDSThese options specify the particular operation to perform. when conntrackd(8) runs in event reliable mode. when packets that are enqueued via nfqueue, and There are corner cases, where it is valid to see entries in the Under normal operation, it is hard to see entries in any of them. The tables "dying" and "unconfirmed" are basically only useful for debugging These entries are attached to packets that are traversing the stack,īut did not reach the confirmation point at the postrouting hook. unconfirmed: This table shows new entries, that are not yet inserted into the conntrack dying: This table shows the conntrack entries, that have expired and that have beenĭestroyed by the connection tracking system itself, or via the conntrack Mechanism used to "expect" RELATED connections to existing ones.Įxpectations are generally used by "connection tracking helpers" (sometimesĬalled application level gateways ) for more complex protocols such asįTP, SIP or H.323. expect: This is the table of expectations. If you don't use connection trackingĮxemptions (NOTRACK iptables target), this means all connections that go It contains a list of all currently trackedĬonnections through the system. TABLESThe connection tracking subsystem maintains several internal tables: conntrack: This is the default table. show anĮvent message (one line) per newly established connection. In addition, you can also monitor connection tracking events, e.g. Using conntrack, you can dump a list of all (or a filtered selection of)Ĭurrently tracked connections, delete connections from the state table, and Inspect and maintain the connection tracking subsystem of the Linux kernel. Netfilter connection tracking system that is intended to replace the old Command to display conntrack manual in Linux: $ man 8 conntrackĬonntrack - command line interface for netfilter connection tracking SYNOPSIS conntrack -L Ĭonntrack -S DESCRIPTIONThe conntrack utilty provides a full featured userspace interface to the
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