Set vpn ipsec esp-group west-central proposal 1 encryption aes256 Set firewall group address-group IPSEC address 172.16.1.1 The following commands on the West Office router are the second half of the tunnel between Central and West: configure Set vpn ipsec auto-firewall-nat-exclude enable Set vpn ipsec site-to-site peer 172.16.1.2 authentication pre-shared-secret ”manitowest” Set vpn ipsec site-to-site peer 172.16.1.2 authentication mode pre-shared-secret
Set vpn ipsec site-to-site peer 172.16.1.2 ike-group central-west Set vpn ipsec site-to-site peer 172.16.1.2 tunnel 0 esp-group central-west Set vpn ipsec site-to-site peer 172.16.1.2 description ”West office” Set vpn ipsec ike-group central-west proposal 1 dh-group 2 Set vpn ipsec ike-group central-west proposal 1 hash sha1 Set vpn ipsec ike-group central-west proposal 1 encryption aes256 Set vpn ipsec ike-group central-west key-exchange ikev2 Set vpn ipsec esp-group central-west pfs dh-group2 Set vpn ipsec esp-group central-west lifetime 1800 Set vpn ipsec esp-group central-west mode tunnel Set vpn ipsec esp-group central-west proposal 1 hash sha1 Set vpn ipsec esp-group central-west proposal 1 encryption aes256 Set firewall name WAN LOCAL rule 15 source group address-group IPSEC Set firewall name WAN LOCAL rule 15 action accept Set firewall name WAN LOCAL rule 15 description ”IPSEC Peers” Set firewall group address-group IPSEC address 172.16.1.2 Set firewall group address-group IPSEC description ”IPSEC peer addresses” The following commands on the Central Office router are the first half of the tunnel between Central and West: configure The two blocks of commands can be copy-pasted to routers on a workbench once they've been configured with IP addresses and a basic default configuration. Enable the NAT exclusion feature in the firewall for IPSEC traffic.Create IPSEC proposals to define "interesting" traffic.
Create IPSEC peers pointing to the opposite router.Create ESP groups with secure encryption and hashing protocols.Create firewall IP address groups for easier firewalling.The two sections of configuration commands below will perform the following steps on both routers: The WAN port on all routers is eth0, and the LAN gateway port is eth1 in keeping with the typical Ubiquiti defaults. The Central Office has a LAN on the 192.168.1.0/24 network, and a WAN address of 172.16.1.1/24. This post does not include the additional configuration of the East Office that is pictured in the topology below and covered in the extended IPSEC guide. This network scenario in this post has a West Branch office that needs to be connected to the Central Office. Some vendors have their own "routed IPSEC" implementations but those are specific to their platforms and outside the scope of this post. Traffic that matches the policy is termed " interesting" and sent via the tunnel, not routed like typical network traffic.
Traffic is sent over IPSEC tunnels when it matches Source and Destination addresses in an IPSEC Policy. It's very important to note that IPSEC is not routing. These SAs have a finite lifetime before they expire and new SAs are negotiated. Once both peers have negotiated a secure connection using the protocols and standards in the proposals Security Associations (SAs) are installed. Each of the peers uses combinations of encryption and hashing protocols to secure traffic that are specified in a Proposal. Terminologyĭevices at both sides of the tunnel are called Peers. The implementation itself is a combination of protocols, settings, and encryption standards that have to match on both sides of the tunnel. IPSEC can be used to link two remote locations together over an untrusted medium like the Internet.
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