https://live.paloaltonetworks.com/t5/vm-series-in-the-public-cloud/gre-tunnels-to-zscaler-in-public-cloud-vm-firewalls/m-p/1266561#M2490 <P>Hi Team,</P> <P>&nbsp;</P> <P>Has anyone created GRE tunnels to Zscaler or anyother third party from a Palo Alto firewall in Azure or GCP?</P> <P>&nbsp;</P> <P>I tried and didn't work and bit of research seem to suggest that Palo Alto doesn't support GRE behind NAT ( Azure or GCP you can't assign public IP directly to the firewall interface and NAT is done by them)&nbsp;</P> Tue, 20 Oct 2026 20:41:55 GMT Namalw 2026-10-20T20:41:55Z https://live.paloaltonetworks.com/t5/vm-series-in-the-public-cloud/gre-tunnels-to-zscaler-in-public-cloud-vm-firewalls/m-p/1266561#M2490 <P>Hi Team,</P> <P>&nbsp;</P> <P>Has anyone created GRE tunnels to Zscaler or anyother third party from a Palo Alto firewall in Azure or GCP?</P> <P>&nbsp;</P> <P>I tried and didn't work and bit of research seem to suggest that Palo Alto doesn't support GRE behind NAT ( Azure or GCP you can't assign public IP directly to the firewall interface and NAT is done by them)&nbsp;</P> Tue, 20 Oct 2026 20:41:55 GMT https://live.paloaltonetworks.com/t5/vm-series-in-the-public-cloud/gre-tunnels-to-zscaler-in-public-cloud-vm-firewalls/m-p/1266561#M2490 Namalw 2026-10-20T20:41:55Z