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SOLUTION: troubleshooting firewall rules with log Analytics

Pre-requisites

In order to apply this solution you have to deploy hub playground only.

Solution

First step is to create a Log Analytics Workspace named playground-workspace in west-europe. In order to analyze firewall logs go to lab-firewall -> Diagnostic Settings -> Add Diagnostic Settings:

  • Name: firewall-diagnostics
  • Logs: Category Group -> All logs
  • Metrics: All Metrics
  • Destination details: Send to Log Analytics Workspace -> playground-workspace
  • SAVE

Prepare routing and firewall rules as described in ping-any-to-any-firewall: when all these steps will be completed each machine will be able to communicate with any other via Firewall.

Test solution

Connect via RDP from spoke-01-vm to spoke-02-vm (10.13.2.4). After that the connection is estabilished, go to lab-firewall -> Logs -> click on Run button in Network Rule Log Data Box.

In the Result pane, the first row should be something like:

Time msg Protocol SourceIP srcport TargetIp target port Action
... ... TCP 10.13.1.4 xxx 10.13.2.4 3389 Allow

Log ingestion from Azure Firewall can require from 60 seconds to 15 minutes, so if nothing is displayed, wait some minute and try again.

now to test the deny logging, change the firewall network policy as follow:

rule name source port protocol destination
all-to-all group-spoke-01
group-spoke-03		 * Any group-spoke-01
group-spoke-02
group-spoke-03

go back to spoke-01-vm and repeat the RDP connection. The connection will be allowed. This is correct because we have denied the traffic that starts from spoke-02 to any other spokes, but because our connection begins from spoke-01 it will be still possible.

Now change the firewall network policy again as follow:

rule name source port protocol destination
all-to-all group-spoke-02
group-spoke-03		 * Any group-spoke-01
group-spoke-02
group-spoke-03

go back to spoke-01-vm and repeat the RDP connection. The connection will be denied. Infact now we have denied all the connections that begin from spoke-01.

Now go to lab-firewall -> Logs -> click on Run button in Network Rule Log Data Box.

In the Result pane, the first row should be something like:

Time msg Protocol SourceIP srcport TargetIp target port Action
... ... TCP 10.13.1.4 xxx 10.13.2.4 3389 Deny