2.53. UDP

Home Prev	cOS Stream 4.00.03 Log Reference Guide	Next

Log Categories: UDP,STATELESS,VALIDATE
Log Message: Mismatching UDP IP payload length.
Default Log Severity: Warning
Parameters: len, iplen, flow, pkt, user, userid
Explanation: The length field in the UDP header does not match the payload length specified by the IP header.
Gateway Action: Drop
Action Description: None
Proposed Action: If the packet sender is one of your network devices, investigate why the unit is sending malformed UDP packets. This log event can be disabled by the IPSettings:LayerSizeConsistency setting.

Log Categories: UDP,STATELESS,VALIDATE
Log Message: Bad UDP checksum.
Default Log Severity: Notice
Parameters: chksum, calcchksum, flow, pkt, user, userid
Explanation: The packet's UDP checksum was incorrect. A bad checksum is normally an indication that the packet data has been corrupted, something that will happen spontaneously when transferred over a physical network medium. This is only a concern when it happens in excess; in this case it may be a sign of broken hardware inside the network.
Gateway Action: Allow
Action Description: None
Proposed Action: The settings UDPSettings:UDP4ChecksumVerification and UDPSettings:UDP6ChecksumVerification can be changed to control the gateways behavior for analyzing the checksum of UDP packets.

Log Categories: UDP,STATELESS,VALIDATE
Log Message: Bad UDP checksum.
Default Log Severity: Warning
Parameters: chksum, calcchksum, flow, pkt, user, userid
Explanation: The packet's UDP checksum was incorrect. A bad checksum is normally an indication that the packet data has been corrupted, something that will happen spontaneously when transferred over a physical network medium. This is only a concern when it happens in excess; in this case it may be a sign of broken hardware inside the network.
Gateway Action: Drop
Action Description: None
Proposed Action: The settings UDPSettings:UDP4ChecksumVerification and UDPSettings:UDP6ChecksumVerification can be changed to control the gateways behavior for analyzing the checksum of UDP packets.

Log Categories: UDP,STATELESS,VALIDATE
Log Message: Bad UDP checksum.
Default Log Severity: Warning
Parameters: chksum, calcchksum, pkt
Explanation: The packet's' UDP checksum was found to be incorrect while performing an important operation e.g. updating a flow state. A bad checksum is normally an indication that the packet data has been corrupted, something that will happen spontaneously when transferred over a physical network medium. This is only a concern when it happens in excess; in this case it may be a sign of broken hardware inside the network.
Gateway Action: Allow
Action Description: None
Proposed Action: Some packets are considered important and must be verified to be valid before they are allowed to pass through the system. Thus, UDP checksum verification cannot be disabled for these key packets.

Log Categories: UDP,STATELESS,VALIDATE
Log Message: Bad UDP checksum.
Default Log Severity: Warning
Parameters: chksum, calcchksum, pkt
Explanation: The packet's' UDP checksum was found to be incorrect while performing an important operation e.g. updating a flow state. A bad checksum is normally an indication that the packet data has been corrupted, something that will happen spontaneously when transferred over a physical network medium. This is only a concern when it happens in excess; in this case it may be a sign of broken hardware inside the network.
Gateway Action: Drop
Action Description: None
Proposed Action: Some packets are considered important and must be verified to be valid before they are allowed to pass through the system. Thus, UDP checksum verification cannot be disabled for these key packets.

Log Categories: UDP,STATELESS,VALIDATE
Log Message: Invalid jumbogram UDP header length.
Default Log Severity: Warning
Parameters: len, expectlen, flow, pkt, user, userid
Explanation: The length field in the UDP header must be zero for IPv6 jumbograms.
Gateway Action: Drop
Action Description: None
Proposed Action: If the packet sender is one of your network devices, investigate why the unit is sending malformed UDP packets. This log event can be disabled by the IPSettings:LayerSizeConsistency setting.

Log Categories: UDP,STATELESS,VALIDATE
Log Message: Truncated UDP header.
Default Log Severity: Warning
Parameters: len, minlen, flow, pkt, user, userid
Explanation: The length field in the UDP header was smaller then the minimum allowed length of 8 bytes.
Gateway Action: Drop
Action Description: None
Proposed Action: If the packet sender is one of your network devices, investigate why the unit is sending malformed UDP packets. This log event can be disabled by the IPSettings:LayerSizeConsistency setting.