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Basic UDP ALG
This ALG performs basic sanity checking on UDP
headers. If it finds errors. it generates the following anomaly events
and system log messages:
- UDP source or destination port 0
- UDP header length check failed
The UDP ALG performs the following steps:
- When it receives the first packet, the ALG creates bidirectional
flows to accept forward and reverse UDP session traffic.
- If the session is idle for more than the maximum allowed
idle time (the default is 30 seconds), the flows are deleted.
- ICMP errors are allowed only if there is a flow that matches
the selector information specified in the ICMP data.
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