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Firewall−Based VPN
The very same issues exist here as with routers. One needs to have compatible (preferably the same vendor’s) firewalls at each location. Mobile users or telecommuters must have compatible VPN software. Firewalls are always potential bottlenecks, so asking them to perform VPN encryption can adversely affect all other access to your network. Here again, there is no substitute for traffic analysis. We only recommend this solution for small networks where the traffic through the firewall can easily be handled by the firewall hardware.