2 Cisco PIX connected to same ISP connection
Posted on 2012-09-21
I'm trying to create a VPN tunnel to my other site. The PIX 515E Firewall currently in use has a restricted license, so I cannot add another interface to it. I also have VPN client users that connect through this FW. When I had the site-to-site working before, the VPN users were not able to connect since the other tunnel was active.
I purchased another 515E FW, assuming I could bind another ISP address to 1 interface and be on my way. This plan was also assuming I could split the ISP connection with a basic switch and have both firewalls connected at the same time. Of course, it didn't work out this way. When I have both FWs connected at the same time, both external interfaces go up and down every couple seconds.
Is there something I am missing here or is this just not possible? I added a basic diagram so you could see what I am trying to accomplish here.
|-----Switch----ISP Cisco 1841 Router