Connecting to Cisco PIX/ASA Devices with IPsec¶
Using IPsec to create a VPN tunnel between pfSense and a Cisco PIX should work OK. As always with IPsec, be sure that the Phase 1 and Phase 2 settings match up on both sides. If an acceptable transform set and policy are already in place, they may be used.
Example PIX IPsec Configuration¶
|10.1.1.0||Network Behind the PIX|
|192.168.1.0||Network Behind the pfSense Router|
|18.104.22.168||IP of the pfSense router (WAN IP, CARP IP, etc)|
|dyn-map 10||Name of the existing crypto map (if any) and a unique ID for this tunnel. If there is an existing map, use its name, but a different number.|
|PFSVPN||Access list name for this connection.|
|(Pre-Shared Key)||PSK For this tunnel|
access-list PFSVPN permit ip 192.168.1.0 255.255.255.0 10.1.1.0 255.255.255.0 access-list PFSVPN permit ip 10.1.1.0 255.255.255.0 192.168.1.0 255.255.255.0 access-list nonat permit ip 10.1.1.0 255.255.255.0 192.168.1.0 255.255.255.0 nat (inside) 0 access-list nonat sysopt connection permit-ipsec crypto ipsec transform-set 3dessha1 esp-3des esp-sha-hmac crypto ipsec security-association lifetime seconds 86400 kilobytes 50000 crypto map dyn-map 10 ipsec-isakmp crypto map dyn-map 10 match address PFSVPN crypto map dyn-map 10 set pfs group2 crypto map dyn-map 10 set peer 22.214.171.124 crypto map dyn-map 10 set transform-set 3dessha1 crypto map dyn-map 10 set security-association lifetime seconds 86400 kilobytes 4608000 crypto map dyn-map interface outside isakmp enable outside isakmp key (Pre-Shared Key) address 126.96.36.199 netmask 255.255.255.255 no-xauth no-config-mode isakmp identity address isakmp nat-traversal 20 isakmp policy 1 authentication pre-share isakmp policy 1 encryption 3des isakmp policy 1 hash sha isakmp policy 1 group 2 isakmp policy 1 lifetime 86400
Corresponding pfSense IPsec Config¶
In the above example, the pfSense IPsec tunnel should be set as follows:
Remote Gateway: (outside IP of the PIX) Authentication Method: Pre-Shared Key Negotiation Mode: Main My Identifier: My IP Address Pre-Shared Key: (The Pre-Shared Key) Encryption Algorithm: 3DES Hash Algorithm: SHA1 DH Key Group: 2 Lifetime: 86400 NAT Traversal: Disable
It may also be advisable to set Proposal Checking to Obey to avoid some issues with building a tunnel when the other side initiates.
Mode: Tunnel IPv4 Local Network: LAN Subnet Remote Network: 10.1.1.0/24 Protocol: ESP Encryption Algorithm: 3DES (others may also be checked, but be sure to leave 3DES checked) Hash Algorithm: SHA1 PFS Key Group: 2 Lifetime: 86400
Rules must also be added to Firewall > Rules on the IPsec Tab to permit traffic from 10.1.1.0/24 (or specific IPs/Alias) to the LAN Net (or specific IPs/Alias).