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https://community.cisco.com/t5/firewalls/does-the-latest-asa-support-gre-tunnels/td-p/2725782
Solved: I have looked at the CLI Book 1: Cisco ASA Series General Operations CLI Configuration Guide, 9.4 and under interface section they don't have GRE option, but I need to make it sure. Does the ASA supports GRE tunnels? Thank you!
https://www.networkstraining.com/configuring-gre-tunnel-through-a-cisco-asa-firewall/
In this configuration tutorial I will show you how to configure a GRE tunnel between two Cisco IOS routers. One of the routers is located behind a Cisco ASA 5500 Firewall, so I will show you also how to pass GRE traffic through a Cisco ASA as well.
https://community.cisco.com/t5/firewalls/5505-asa-gre/td-p/1854844
ASA is a fundamentally a security appliance. So it doesnt support a lot of general IP routing features like PBR, dual default routes. and wide range of other things. ASA's dont support GRE as you need to create a Tunnel interface in order to run GRE. In fact you cant even create a loopback interface on a ASA.
https://www.cisco.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike-protocols/14381-gre-ipsec-ospf.html
Sep 26, 2008 · Refer to PIX/ASA 7.x and later : VPN/IPsec with OSPF Configuration Example for more information on how to configure for a VPN/IPsec with Open Shortest Path First (OSPF) without a GRE tunnel on Cisco PIX Security Appliance Software Version 7.x or Cisco Adaptive Security Appliance (ASA).
https://learningnetwork.cisco.com/thread/30441
Nov 12, 2018 · GRE over IPSec - Where you configure a GRE tunnel and then encrypt it. IPSec is your transport. You get to allow multicast and other fun things like that. IPSec over GRE - Here is where you configure a GRE tunnel and then put your crypto maps on that tunnel. GRE is your transport, but packets inside it are encrypted.
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