VPN lan-to-lan (Cisco and pfSense)

What is a VPN lan-to-lan or also names site-to-site?

A lan-to-lan virtual private network (VPN) is a connection between two or more networks, such as a head office network and a branch office network. Many companies use lan-to-lan VPNs to leverage an internet connection for private traffic as an alternative to using MPLS circuits.

Lan-to-lan VPNs are frequently used by organizations with multiple offices in different locations that need access and use of corporate network. With a lan-to-lan VPN, a company can securely connect its head office network with its remote offices to communicate and share resources with them as a single network.

Configuring Cisco router:

crypto isakmp policy 10
 encr 3des
 authentication pre-share
 group 2
crypto isakmp key A_STRONG_KEY address 1.1.1.1 no-xauth
crypto ipsec transform-set 3DES-SHA esp-3des esp-sha-hmac
access-list 100 permit ip 192.168.100.0 0.0.0.255 10.0.5.0 0.0.0.255
access-list 100 permit ip 10.0.5.0 0.0.0.255 192.168.100.0 0.0.0.255
crypto map PFVPN 15 ipsec-isakmp
 set peer 1.1.1.1
 set transform-set 3DES-SHA
 set pfs group2
 match address 100
interface gigabitethernet0/0
crypto map PFSVPN

Configuring pfSense router:

Remote Gateway: 2.2.2.2 
Authentication Method: Pre-Shared Key 
Negotiation Mode: Main 
My Identifier: My IP Address 
Pre-Shared Key: A_STRONG_KEY 
Encryption Algorithm: 3DES 
Hash Algorithm: SHA1 
DH Key Group: 2 
Lifetime: 28800 
NAT Traversal: Disable
Mode: Tunnel 
Local Network: LAN Subnet 
Remote Network: 10.0.5.0/24 
Protocol: ESP 
Encryption Algorithm: 3DES 
Hash Algorithm: SHA1 
PFS Key Group: 2 
Lifetime: 3600

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