How to Configure GRE Tunnels on Zscaler (Step-by-Step)
Task
- Configure GRE tunnels on Zscaler router with NAT.
- Configure Branch vEdges to route all unknown traffic to route using Zscaler Cloud router, this solution should be implemented using service chaining.
Configuration
interface Tunnel1
description BranchA-vEdge01
ip address 192.0.0.1 255.255.255.252
ip nat inside
ip virtual-reassembly in
tunnel source Ethernet0/0
tunnel destination 1.1.1.6
end
!
interface Tunnel2
description BranchB-vEdge01
ip address 192.0.0.5 255.255.255.252
ip nat inside
ip virtual-reassembly in
tunnel source Ethernet0/0
tunnel destination 1.1.1.7
end
Task2:
Configuration –à Templates –à Feature -àAdd Template –à Select vEdge Cloud –à Select VPN Interface GRE –à Give Template name and Description –à Change Default State from Down to UP —à Configure Destination IP –à Source Interface –à IPv4 address of tunnel (keep it Variable) –à Save
Attach this new feature template with your existing Device Template.
Configuration –à Templates –à Device -à Search your template –à Click on 3 dots –à Edit -à click on plus (+) VPN Interface GRE –à Select your feature template –à Update –à Fill your GRE IP information.
Verification:
If everything is ok you should able to see GRE status up up.
