Diagnostics messages

The following messages are generated by APM upon analyzing diagnostics test results for a network path. They describe issues detected.

Message ID	Message
Excessive latency measured	Advanced Analysis “Excessive latency measured”
Excessive packet rtt	Advanced Analysis “Excessive packet round-trip time (RTT) detected”
High utilization detected	Advanced Analysis “High utilization detected”
Rate-limiting detected	Advanced Analysis “Rate-limiting behavior detected”
Maximum transmission unit	Maximum Transmission Unit
Message 1	ICMP connectivity error messages received
Message 10	Responder agent in use
Message 1001	Capacity constriction <capacity measure> detected between hop <number> and hop <number>
Message 1002	Black hole detected between hop and target
Message 1003	Congestion detected between hop <number> and target
Message 1004	Duplex conflict detected between hop <number> and target
Message 1005	Excessive latency detected at target
Message 1006	Gray-hole detected between hop <number> and target
Message 1007	Excessively long media used for half duplex causing <percent> loss detected between hop <number> and hop <number>
Message 1008	High utilization <percent> detected at target
Message 1009	Intermittent connectivity causing <percent> loss detected between hop <number> and target
Message 1010	IP QoS value alteration started at hop <number>
Message 1011	Limited performance due to use of half duplex or mixture of half- and full-duplex modes detected between hop <number> and target
Message 1012	Limited performance due to misconfigured NIC cards or drivers detected between hop <number> and target
Message 1013	Limited performance may be due to a mid-path device or a slow-path response at target
Message 1014	Limiting mechanism detected between hop <number> and target
Message 1015	Media errors causing <percent> loss detected between hop <number> and target
Message 1016	MTU constriction <measured MTU> detected at hop <number>
Message 1017	Other possible diagnoses present - see <view> details
Message 1018	Packet loss <percent> originating at hop <number>
Message 1019	Path MTU discovery is not supported at target
Message 1020	MOS value of <MOS value> measured to target <address>, due to <percent> loss
Message 1021	Poorly performing link due to half-duplex constriction detected between hop <number> and target
Message 1022	QoS mechanism may be compromised on network path
Message 1023	Routing loop causing <percent> loss detected between hop <number> and target
Message 1024	Small packet congestion detected between hop <number> and target
Message 1025	Specified VoIP call load is excessive for network path
Message 1026	Largest latency in path detected between hop <number> and hop <number>
Message 1027	White hole detected between hop and target
Message 1028	MTU is too large to reliably detect network problems
Message 1029	Limited performance may be due to a slow-path response at target
Message 1030	Packet reordering <percent> detected at target <address>
Message 1031	Limited performance due to VLAN tagging (802.1p QoS) mismatch detected between hop <number> and target
Message 1033	IP QoS value alteration detected at target <address>
Message 1034	Source monitoring point appears to be behind a firewall
Message 11	Excessive latency measured
Message 12	Excessive packet round-trip time (RTT) detected
Message 13	Device does not respond suitably to test packets
Message 14	Traceroute failed to complete
Message 154	Some measurements are unavailable at this hop
Message 16	Inconsistent network path detected”
Message 17	Network path does not properly support PMTU discovery
Message 18	Packet loss detected
Message 19	Insufficient statistics to generate all measurements”
Message 2	ICMP error response messages received
Message 21	ICMP TTL Expired message received”
Message 22	ICMP Fragmentation Needed And DF Set message received
Message 23	Total capacity does not correspond to any known standard
Message 24	CPU-limited response - total capacity depressed
Message 25	Total capacity corresponds to an Ethernet standard
Message 26	Total capacity corresponds to a non-Ethernet standard
Message 27	Inconsistent handling of voice packets detected”
Message 28	High utilization detected
Message 3	ICMP router messages received
Message 30	Measured MTU is too large for reliable packet error detection
Message 31	Sub-optimal MOS indicates presence of user-detectable voice degradation
Message 32	IP QoS value was altered in packets
Message 33	Congestion causing packet loss detected
Message 34	Rate-limiting behavior detected
Message 35	Half/Full-duplex conflict detected
Message 36	Full/Half-duplex conflict detected
Message 37	MTU conflict detected
Message 39	Media errors detected
Message 4	ICMP ECHO REPLY packets received that were not solicited
Message 40	Black-hole hop detected - MTU conflicts possible
Message 41	Gray-hole hop detected - MTU conflicts possible
Message 42	Path MTU constriction point detected
Message 43	Path congestion point detected
Message 44	Root cause of target host condition detected
Message 45	Longest link on network path detected
Message 46	Path capacity constriction point detected
Message 47	Inconsistent behaviors observed at this hop - response does not reflect end-to-end performance
Message 5	Packet reordering detected
Message 51	Routing loop in network path detected
Message 52	ICMP limiting by a device in the network path detected
Message 54	White-hole hop detected - performance degradation due to fragmentation possible
Message 55	Half-duplex collision domain violation detected
Message 56	Sub-optimal performance detected
Message 59	Specified voice call load is excessive for this path
Message 6	Detected MTU is a known standard
Message 60	QoS mechanism may be compromised
Message 61	Poorly performing link impacting time-sensitive traffic detected
Message 62	Small packet congestion detected
Message 63	Limiting detected at target
Message 64	Intermittent connectivity loss detected during testing
Message 7	Detected MTU is nonstandard
Message 8	Detected MTU is a common jumbo frame size
Message 9	IP address for this hop appears more than once in network path
Mixing TCP and legacy	Mixing TCP and Legacy Protocols
The apparent network	The apparent network
Packet reordering	Understanding reordered packets
Why duplex conflicts occur	Why duplex conflicts occur

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