Cisco administration 101: Configure GRE tunnels - TechRepublic

Raise a ticket and provide the static public IP address, which is used as the GRE tunnel or IPsec tunnel source IP address. Zscaler uses the source IP address to identify the customer IP address. The source IP needs to be a static public IP. Zscaler responds with two ZEN IP addresses (Primary and Secondary) to transmit traffic to. Generic Routing Encapsulation (GRE) is used when IP packets need to be sent from one network to another, without being parsed or treated like IP packets by any intervening routers. However, they are not secure, does not provide encryption. With GRE we can configure a virtual tunnel between two endpoints. See below for an example of configuring GRE tunnels, with a network diagram for clarity. When we issue the Interface tunnel command, we create a logical interface on the router and name it appropriately. Please be aware the tunnel numbers do not have to match; for example on R2 it could be Tunnel 101 instead of 100. A Secure Shell (SSH) tunnel consists of an encrypted tunnel created through an SSH protocol connection. Users may set up SSH tunnels to transfer unencrypted traffic over a network through an encrypted channel. For example, Microsoft Windows machines can share files using the Server Message Block (SMB) protocol, a non-encrypted protocol.

How GRE Tunnels Work | VPN Tunnels Part 1 - YouTube

GRE Tunnel Interface States and What Impacts Them - Cisco Aug 08, 2018

Apr 16, 2012 · Now that we have a GRE with IPSec protection our GRE tunnel is secure from the eavesdropping eyes of the internet. This GRE tunnel also provides us a transport mechanism to carry multicast traffic so we can run a routing protocol over this connection providing us with a scalable solution for managing site-to-site VPNs and our routing

Secure GRE Tunnels—Describes how GRE and IPsec complement each other across the network Configure GRE over IPsec Using SDM— Describes how SDM wizards permit easy configuration of GRE over IPsec Generic routing encapsulation (GRE) tunnels have been around for quite some time. Solved: Dear Team, We have requirement to configure GRE TUnnel with Zscaler in Cisco Firepower Is it possible to create GRE Tunnel From Cisco Firepower ? if it is possible can you share any document for this configuration Regards, Harmesh Yadav