Iptables Tutorial 1.2.2

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UDP matches

This section describes matches that will only work together with UDP packets. These matches are implicitly loaded when you specify the --protocol UDP match and will be available after this specification. Note that UDP packets are not connection oriented, and hence there is no such thing as different flags to set in the packet to give data on what the datagram is supposed to do, such as open or closing a connection, or if they are just simply supposed to send data. UDP packets do not require any kind of acknowledgment either. If they are lost, they are simply lost (Not taking ICMP error messaging etc into account). This means that there are quite a lot less matches to work with on a UDP packet than there is on TCP packets. Note that the state machine will work on all kinds of packets even though UDP or ICMP packets are counted as connectionless protocols. The state machine works pretty much the same on UDP packets as on TCP packets.

Table 10-3. UDP matches


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