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Reference Manual for the ProSafe Wireless 802.11g Firewall/Print Server Model FWG114P v2
Virtual Private Networking 8-25
201-10301-02, May 2005
VPNC Scenario 2: Gateway-to-Gateway with Certificates
The following is a typical gateway-to-gateway VPN that uses PKIX certificates for authentication.
Figure 8-16: VPN Consortium Scenario 2
Gateway A connects the internal LAN 10.5.6.0/24 to the Internet. Gateway A's LAN interface has
the address 10.5.6.1, and its WAN (Internet) interface has the address 14.15.16.17.
Gateway B connects the internal LAN 172.23.9.0/24 to the Internet. Gateway B's WAN (Internet)
interface has the address 22.23.24.25. Gateway B's LAN interface address, 172.23.9.1, can be used
for testing IPsec but is not needed for configuring Gateway A.
The IKE Phase 1 parameters used in Scenario 2 are:
•Main mode
• TripleDES
• SHA-1
• MODP group 2 (1024 bits)
• Authentication with signatures authenticated by PKIX certificates; both Gateway A and
Gateway B have end-entity certificates that chain to a root authority called "Trusted Root CA."
• SA lifetime of 28800 seconds (eight hours) with no kbytes rekeying
The IKE Phase 2 parameters used in Scenario 2 are:
• TripleDES
• SHA-1
• ESP tunnel mode
• MODP group 2 (1024 bits)
• Perfect forward secrecy for rekeying
• SA lifetime of 3600 seconds (one hour) with no kbytes rekeying
10.5.6.0/24
10.5.6.1
Gateway A
14.15.16.17 22.23.24.25
172.23.9.0/24
Internet
Gateway B
172.23.9.1