How to Configure GRE Tunnel Zscaler Cloud

Ensuring secure and efficient communication between remote locations is crucial in network environments. One effective way to achieve this is through GRE (Generic Routing Encapsulation) tunnels. 

This article will explore how to configure a GRE tunnel on Zscaler, a leading cloud security provider. Whether preparing for CCNP Security training or looking to enhance your network security and performance, understanding GRE tunnels is essential. 

Join us as we delve into the step-by-step process to set up and configure GRE tunnels on Zscaler to optimize your network infrastructure.

Tasks for How to Configure GRE Tunnels                                                            

● 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.

Configuring GRE Tunnel

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

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Task2 Configure Branch vEdges to route :

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 be able to see GRE status up.

Follow the above steps to configuration of GRE tunnels on Zscaler, if you can implement GRE tunnels with confidence. Enroll in Cisco SCOR training, understanding GRE tunnel configuration is an indispensable part of your skill set. Keep honing your skills with our in-depth guides and tutorials, and stay ahead in the field of network security.