ActiveConnectionCount
The total number of concurrent active TCP connections through the NAT gateway.
A value of zero indicates that there are no active connections through the NAT gateway.
Units: Count
Statistics: The most useful statistic is Max.
BytesInFromDestination
The number of bytes received by the NAT gateway from the destination.
If the value for BytesOutToSource is less than the value for BytesInFromDestination, there might be data loss during NAT gateway processing, or traffic being actively blocked by the NAT gateway.
Units: Bytes
Statistics: The most useful statistic is Sum.
BytesInFromSource
The number of bytes received by the NAT gateway from clients in your VPC.
If the value for BytesOutToDestination is less than the value for BytesInFromSource, there might be data loss during NAT gateway processing.
Units: Bytes
Statistics: The most useful statistic is Sum.
BytesOutToDestination
The number of bytes sent out through the NAT gateway to the destination.
A value greater than zero indicates that there is traffic going to the internet from clients that are behind the NAT gateway. If the value for BytesOutToDestination is less than the value for BytesInFromSource, there might be data loss during NAT gateway processing.
Unit: Bytes
Statistics: The most useful statistic is Sum.
BytesOutToSource
The number of bytes sent through the NAT gateway to the clients in your VPC.
A value greater than zero indicates that there is traffic coming from the internet to clients that are behind the NAT gateway. If the value for BytesOutToSource is less than the value for BytesInFromDestination, there might be data loss during NAT gateway processing, or traffic being actively blocked by the NAT gateway.
Units: Bytes
Statistics: The most useful statistic is Sum.
ConnectionAttemptCount
The number of connection attempts made through the NAT gateway. This includes only the initial SYN. In some cases, ConnectionAttemptCount may be lower than ConnectionEstablishedCount due to SYN retransmission.
If the value for ConnectionEstablishedCount is less than the value for ConnectionAttemptCount, this indicates that clients behind the NAT gateway attempted to establish new connections for which there was no response.
Unit: Count
Statistics: The most useful statistic is Sum.
ConnectionEstablishedCount
The number of connections established through the NAT gateway. This includes SYN and SYN retransmissions.
If the value for ConnectionEstablishedCount is less than the value for ConnectionAttemptCount, this indicates that clients behind the NAT gateway attempted to establish new connections for which there was no response.
Unit: Count
Statistics: The most useful statistic is Sum.
ErrorPortAllocation
The number of times the NAT gateway could not allocate a source port.
A value greater than zero indicates that too many concurrent connections are open through the NAT gateway.
Units: Count
Statistics: The most useful statistic is Sum.
IdleTimeoutCount
The number of connections that transitioned from the active state to the idle state. An active connection transitions to idle if it was not closed gracefully and there was no activity for the last 350 seconds.
A value greater than zero indicates that there are connections that have been moved to an idle state. If the value for IdleTimeoutCount increases, it might indicate that clients behind the NAT gateway are re-using stale connections.
Unit: Count
Statistics: The most useful statistic is Sum.
PacketsDropCount
The number of packets dropped by the NAT gateway.
To calculate the number of dropped packets as a percentage of the overall packet traffic, use this formula: PacketsDropCount/(PacketsInFromSource+PacketsInFromDestination)*100. If this value exceeds 0.01 percent of the total traffic on the NAT gateway, there may be an issue with Amazon VPC service. Use the AWS service health dashboard to identify any issues with the service that may be causing NAT gateways to drop packets.
Units: Count
Statistics: The most useful statistic is Sum.
PacketsInFromDestination
The number of packets received by the NAT gateway from the destination.
If the value for PacketsOutToSource is less than the value for PacketsInFromDestination, there might be data loss during NAT gateway processing, or traffic being actively blocked by the NAT gateway.
Unit: Count
Statistics: The most useful statistic is Sum.
PacketsInFromSource
The number of packets received by the NAT gateway from clients in your VPC.
If the value for PacketsOutToDestination is less than the value for PacketsInFromSource, there might be data loss during NAT gateway processing.
Unit: Count
Statistics: The most useful statistic is Sum.
PacketsOutToDestination
The number of packets sent out through the NAT gateway to the destination.
A value greater than zero indicates that there is traffic going to the internet from clients that are behind the NAT gateway. If the value for PacketsOutToDestination is less than the value for PacketsInFromSource, there might be data loss during NAT gateway processing.
Unit: Count
Statistics: The most useful statistic is Sum.
PacketsOutToSource
The number of packets sent through the NAT gateway to the clients in your VPC.
A value greater than zero indicates that there is traffic coming from the internet to clients that are behind the NAT gateway. If the value for PacketsOutToSource is less than the value for PacketsInFromDestination, there might be data loss during NAT gateway processing, or traffic being actively blocked by the NAT gateway.
Unit: Count
Statistics: The most useful statistic is Sum.
PeakBytesPerSecond
This metric reports the highest 10-second bytes per second average in a given minute.
Units: Count
Statistics: The most useful statistic is Maximum.
PeakPacketsPerSecond
This metric calculates the average packet rate (packets processed per second) every 10 seconds for 60 seconds and then reports the maximum of the six rates (the highest average packet rate).
Units: Count
Statistics: The most useful statistic is Maximum.
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