How to configure Site to Site VPN on a Cisco ASA

2. Configuring the FortiGate using the IPsec VPN Wizard

Configuring Site to Site IPSec VPN Tunnel Between Cisco Routers
I have seen problems in the past where a different name had been used. Cisco solved this by using these reference numbers. Virtual network details In this first page fill in the name of virtual network and the location of your on premises network. Like I said the transform-sets define which encryption we use in phase 2, or at the IPSec level. Trying to duplicate this setup - but with some different IPs - I get an error when I plugin at step 7, the branch office: Use the conditionals described here to filter out unnecessary debug output: You create this selection using an access-list.

Table of Contents

Cisco ASA Site-to-Site IKEv1 IPsec VPN

We reference these transform-sets later when configuring the crypto map. The defaults reference the encryption that is used. This could be anything you like, though. After that the encryption type and authentication type are specified. We do this with a crypto map. I will first create the configuration items that we would use at the main site and then explain the individual items: After the name comes a reference number.

The reason for this number is that you can only apply one crypto map to each interface. This would be a problem if you had 2 branch offices and only one outside interface! Cisco solved this by using these reference numbers. You use the same crypto map every time on an interface, but you can use different reference numbers per tunnel.

This way you are able to setup multiple tunnels on this single interface. Then on the first line you see the access-list we created referred to. This is where we say, if you see THAT traffic, put it into the tunnel. Second, we define the peer. We reference the NAME of the transform-set defined in the previous step.

When you have your crypto map defined it still won't do anything until it is applied to an interface. Make sure you apply it to the interface closest to the other side of the tunnel, in our case the outside interface: This is Isakmp or phase 1. To get a management layer security association going the ASA's need policies defined. They go top down through these policies until they find one that they agree on. If they don't phase 1 and therefore the complete tunnel, won't come up.

Since both sides need to agree we need to create at least one policy and it needs to be the same on both sides. Let's look at the configuration as it should be on both sides and go through it: The lower the number, the higher it will be in the config, the sooner it will be tried for setting up a tunnel.

Usually you would put the most secure at the top, as it has preference. If it can't agree on that level of security it will go one less secure and so on.

The first line configures the means of authentication of the tunnel. You can use either a pre-shared key or a certificate. Pre-shared keys are the easiest to implement, certificate are easiest to manage in large environments.

I won't go into details of both; I chose pre-shared keys for our tunnel here for ease of explanation. Next we define the encryption and authentication mechanisms. This looks a lot like the transform-set, however that is used for encrypting at IPSec level.

Then we find the command 'group 5', which references to Diffie-Hellmann group 5. The working of Diffie-Hellmann is beyond the scope of this document, but in short it's a secure way to get secure information keys over an insecure connection.

Finally the lifetime of the SA's in seconds. After the lifetime has expired, the keys will be recalculated. The tunnel is not affected. When you are done with configuring enable isakmp on the interface on which the ASA should be able to build a tunnel: In site to site tunnels I would advise using the IP address of the peer as the group-name.

I have seen problems in the past where a different name had been used. In the second, we create something that we referenced earlier: You define it here and reference it in the crypto isakmp policy. Make sure that the key is the same on both ASA's! I would also advise to use a stronger key then the one I use here, as it is basically a password into your network.

You have created your site-to-site tunnel! Now go to a client on either one of the locations and start a ping, remote desktop session or open a web site. The first try might fail, but don't get discouraged. When the first packet arrives at the ASA it will start setting up the tunnel, which can take a few seconds.

Then try again and you should now be able to reach all pc's, printers and servers on both sides of the tunnel. Create new virtual network Page 1: Virtual network details In this first page fill in the name of virtual network and the location of your on premises network.

Once the gateway is created, the gateway IP address will be displayed in the dashboard. Creating Crypto Map Configure crypto map using below configuration, if your ASA already has existing crypto map use the same name with different priority number. ASA configuration is now complete!

My-ASA config show run object-group object-group network azure-networks network-object My-ASA Config Show run crypto crypto ipsec ikev1 transform-set azure-ipsec-proposal-set esp-aes esp-sha-hmac crypto ipsec security-association lifetime seconds crypto ipsec security-association lifetime kilobytes crypto map azure-crypto-map 1 match address azure-vpn-acl crypto map azure-crypto-map 1 set peer Verification on Azure Portal: Verification on Cisco ASA: Agreed Ok, I was wrong - instructions work via this link in your account of course https: Update one with latest Azure Deployment model.

Check out new blog with MS Azure latest deployment model https: Very detailed post thank you. Is VPN a must to use azure? Forward Flow based lookup yields rule: Created by grgibbs on Created by Michal Garcarz on Hello Team, It needs to be simple mistake, i had it working, now it's not working. I authorize user in LDAP which hits authz rule having the following authorization profile: Back to Cisco Routers Section.

Deal with bandwidth spikes Free Download. Network Analyzer Free Download. Web Vulnerability Scanner Free Download. Pre-share - Use Pre-shared key as the authentication method. Expressed in either kilobytes after x-amount of traffic, change the key or seconds. Value set is the default value. R1 config crypto ipsec transform-set TS esp-3des esp-md5-hmac. R2 config crypto isakmp policy 1 R2 config-isakmp encr 3des. R2 config access-list deny ip R1 show crypto session Crypto session current status.

Articles To Read Next:

2. [The situation] --------------------

Like the headquarters office, the business partner is also using a Cisco IOS VPN gateway (a Cisco series with an Integrated Service Adaptor (ISA) or VAM (VAM, VAM2, or VAM2+), a Cisco series router, or a Cisco series router). Choose Configure > Security > VPN > Site-to-Site VPN, and click the radio button next to Create a Site-to-Site VPN. Click Launch the selected task. Choose Step by step wizard in order to proceed with the configuration, and click Next. In the next window, provide the VPN Connection Information in the respective spaces. Configuring Site to Site IPSec VPN Tunnel Between Cisco Routers - out of 5 based on votes Tweet Site-to-Site IPSec VPN Tunnels are used to allow the secure transmission of data, voice and video between two sites (e.g offices or branches)/5().