GlobalProtect DNS server ignores the access routes

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L4 Transporter

GlobalProtect DNS server ignores the access routes

Hey all,

Just another PaloAlto funkiness I found out today...

When you configure a DNS server under the gateway configuration for GlobalProtect a route will automatically be added to route traffic to this DNS-ip through the tunnel: REGARDLESS of what you fill in in the access routes.

Ex: DNS server: 10.0.0.1 and access route: 192.168.0.0/16

When connected with GlobalProtect your Windows route table will be

192.168.0.0/16 -> GlobalProtect tunnel

10.0.0.1 -> GlobalProtect tunnel (although this ip is NOT in the access route range)

Just something to think about when you are maybe running into routing issues like I was.

L7 Applicator

Re: GlobalProtect DNS server ignores the access routes

Thanks for the note.

I guess this make sense since you would need a route to use the DNS server.  So we would be adding a subnet for this route for the clients during the setup process.

But I'm with you, I like to have independent control of where the routes are installed on the network.

Steve Puluka BSEET - IP Architect - DQE Communications (Metro Ethernet/ISP)
ACE PanOS 6; ACE PanOS 7; ASE 3.0; PSE 7.0 Foundations & Associate in Platform; Cyber Security; Data Center
L7 Applicator

Re: GlobalProtect DNS server ignores the access routes

when we add the x.x.x.x/32 access route for the DNS server we also ensure this DNS server will always be reachable for clients, even if they are located in a network that overlaps the access route and possibly have a local resource with an identical IP (/32 has priority over all bigger subnets), or the access routes inadvertently don't cover the DNS' IP

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