Understanding IPsec VPN Routing
SRX Series devices must know how to reach destination networks. This can be done through the use of static routing or dynamic routing. In Security Director, route-based VPNs support OSPF, RIP, and eBGP routing along with static routing. Static routing requires that administrators specify the list of host or network addresses at each site as part of the VPN. For example, in a retail scenario, where thousands of spokes can be part of a VPN, the static routing approach generates a huge configuration at each device. Static routing requires administrator to manually configure each route. Problems occur as the infrastructure changes or when the administrator does not have access to the addresses for the protected network. Keeping routes up-to-date manually creates tremendous overhead.