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We have currently at work two ISP boxes(routers), i want to setup a firewall to protect an intranet on a local host. The problem is that not every one is using the same router.

Here is my question: how can i do to make all traffic be sent to one location (firewall-loadbalancer) then the loadbalancer switchs automatically between the two routers .

EDIT: The network is a small office network, there's 6 hosts and the intranet runs an one of them. The host must be reachable from outside but a firewall rule must filters the incoming connections. The rest of the network must send traffic to one locations, which forwards it automatically to the two routers.

EDIT2: Here is the current diagram :

Solution: I found that i have either to use a bond interface on the firewall as pberlijn sayed, or routing manually to each router like here linux advanced routing


merged by sysadmin1138 May 17 '11 at 20:14

This question was merged with Loadbalancing between two isp uplinks because it is an exact duplicate of that question.

migrated from May 17 '11 at 19:52

This question came from our site for computer enthusiasts and power users.

possible duplicate of 2 WAN to LAN, What router do I need? – Not Kyle stop stalking me May 17 '11 at 12:33
possible duplicate of Loadbalancing between two isp uplinks – Iain May 17 '11 at 19:55