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2023

Troubleshooting failed IP group that causes an AzureFirewall to fail

This is the documentation of a problem I encountered at work today, where updating an IP Group failed and caused the AzureFirewall policy associated with the IP Group to go into a 'Failed' state as well.

In my recent case, this happened in a parent/child policy setup. Traffic was still forwarded correctly by the AzureFirewall.

Update Oct. 2023

This procedure also worked in cases where the parent policy (and one AzFW) failed without any ip group failures.

General procedure:

  • Disconnect child from failed parent policy
  • PUT operation to get the parent policy in 'Succeeded' state
  • (optional, if needed) PUT operation to get the AzFW in 'Succeeded' state
  • If everyhting is in 'Succeeded' state, attach child to parent policy again
  • in lab
  • 5 min read

Azure Policy Guest Configuration for Linux - Part 1

I'm currently checking out Azure Policy Guest Configuration for Linux VMs and will note down my progress made here. The whole process took me a while to understand, also I haven't used DSC before. Learning on the fly!

Objectives

  • Audit that a user is present on the system
  • Audit that a file with specific content is present in a specific path
  • Audit that a service is running
  • Continuous remediation of non-compliant systems
  • in lab
  • 8 min read

Zscaler Tunnels on Azure - Part 2 - Linux IPSec

In my last post, I created a IPSec tunnel to Zscaler using Azure VPN Gateway. Unfortunately, this setup does not work in a Virtual WAN environment, because spoke Vnets can't have Vnet gateways. Using VWAN VPN Gateways would make the VPN tunnel a branch, which is not what we need (I also want to avoid routing Public IPs internally).

Another option would be to use the Linux server to do the DNAT and IPSec tunnel, so this is what we will explore here.

  • in lab
  • 7 min read

Zscaler Tunnels on Azure - Part 1 - VPN Gateway

This post will look at how to build IPSec tunnels to Zscaler on Azure with Azure VPN Gateway. The complete Lab setup including notes is available here as bicep files with additional notes and outputs.

The target setup should provide the options to forward traffic to the Zscaler tunnels in a default route and non-default route environment.