How to check SNAT port usage of NatGateway with existing IP

Question

Hi exports,

Our team will use NatGateway with public ip as the explicit outbound connectivity method of VMs.

May I ask is there any way to monitor current usage of SNAT Port on NatGateway?

For example, if there is a method to let us know that currently more than 80% of existing SNAT port are occupied, we can add additional IP to the NAT Gateway. Or If we can know currently it is only 1% SNAT port usage, we can decrease the IP to save the cost. Thanks.

Answer 1

Hello

I have not used this myself but there seem to be metrics for it, you can also use AMBA to deploy them. Down below are some links with explanation for them, amba also provides recommended thresholds from Microsoft for alerting on these metrics.

https://learn.microsoft.com/en-us/azure/nat-gateway/nat-metrics#total-snat-connection-count

AMBA

https://azure.github.io/azure-monitor-baseline-alerts/services/Network/natGateways/#snatconnectioncount

Hope this is helpful and remember shared knowledge is the best knowledge 😊

Best Regards,

Timmy Malmgren

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