Correct IP setting when two firewalls connected to one ISP.

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L4 Transporter

Re: Correct IP setting when two firewalls connected to one ISP.

It's easy to get confused by Palo Alto's various uses of VLAN.

 

A "VLAN" interface is different from a "Layer 3" interface that has 802.1q vlan tags enabled.

 

On a PA device "VLAN" interfaces are used to create a virtual switch using ports on the firewall, and allow them to operate as layer 2 interfaces without routing abilities.  Essentially, it create a bridged interface using all the VLAN interfaces.

 

If you want to enabled tagged (or untagged) 802.1q vlans on interfaces, then configure them as "Layer 3" and create sub-interfaces with the vlan tag set there.

 

Would be nice if PA updated their UI to remove the ambiguous and confusing "VLAN" interface type.  "Bridge" would be more accurate.

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L4 Transporter

Re: Correct IP setting when two firewalls connected to one ISP.

I couldn't agree with you more.  This really confused me the first time I used PAN and the documentation explaining this wasn't great.

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