Configuring IPsec and ISAKMP. This chapter describes how to configure Internet Protocol Security (IPsec) and the Internet Security. [email protected] Remote Subnet. Remote Subnet Mask. Pre-shared Key test. NAT Traversal. Enabled. Tab. 2: IPSec. "NAT-T lets IPsec peers establish a connection through a NAT device. It does this by encapsulating IPsec traffic in UDP datagrams, using port , thereby. OKC HOUSTON BETTING LINE
It looks like everything works perfectly when the initiator is the peer from the inside of the PAT device. Let's issue the clear crypto session command and try something different. This time I'm going to initiate the traffic from the site outside of the firewall.
I'm going to have the PC on the This time it will fail as you can see below. View fullsize Let's take a look at the initiator router's debug output: View fullsize It looks like the initiator never makes it past the first Main Mode message.
If you look at the debug output on the responder, there won't be anything showing up at all. View fullsize The reason for this is that you're trying to initiate traffic from a lower security interface to a higher interface. By default, the ASA should be doing it's job and blocking any traffic from the lower security interface. You need two things in order to get the Main Mode messages from the peer on the outside to the peer on the inside: 1. Note: If you're using post Configure routes to the HQ and branch.
Configure the Cisco firewall: Set IP addresses for interfaces and enable access control on the interfaces. Configure the default route from the Cisco firewall to the Internet. Enable the IPSec policy on the interface. Otherwise, the tunnel cannot be established. Set IP addresses for interfaces and assign them to security zones.
In the example, the next-hop IP address is 1. Configure an ACL to define the data flow to be protected. Configure interfaces and assign them to security zones. Configure the IP address of the Cisco firewall interface. ASA config access-list 10 extended permit icmp any any ASA config access-group 10 in interface in ASA config access-group 10 out interface in ASA config access-group 10 in interface out ASA config access-group 10 out interface out Configure a default route from the Cisco firewall to the Internet.
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