Yes, in proxy mode your servers can live anywhere and as long as you can get to the real port you are load balancing, a firewall can be used with this service.
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Ranges to allow through server firewall
Frontend (public) network:Ports to allow:ICMP – ping (for support troubleshooting)All TCP/UDP...
How to install APF (Advanced Policy Firewall)
What is APF (Advanced Policy Firewall)? APF FirewallAPF is a policy based iptables firewall...
How do I enable/disable my Iptables firewall?
To start IP tables on your RedHat server,# service iptables startYou can run the following...
Hardware Firewall configuration
A Hardware Firewall is a network device that is connected upstream from a server. The Firewall...
Configure APF Firewall
A firewall is a very good idea for a server. Though many people think that a firewall is instant...
