Connectivity issues after IP changes
June 23, 2009 11:42 AM Subscribe
Our office recently changed ISPs, which meant changing our public IPs. Connectivity issues abound. I'm fairly certain the firewall is at fault, but I'm not sure where to go from here.
posted by lholladay to Computers & Internet (6 answers total) 1 user marked this as a favorite
We changed ISPs. We now have a new /26 subnet. I've updated all internal servers, and the firewall. (Cisco ASA 5510). All internal office PCs are set to use the firewall as their gateway. The firewall then does dynamic NAT on the internal IPs, translating them to a single public IP.
Certain websites we host refuse to load. These sites are hosted at Rackspace. Sometimes I'll get a title, sometimes the progress bar goes a little further, but for the most part, the browser just spins. This doesn't happen with the rest of the internet. Just our hosted sites. I can access the sites just fine from home.
Serendipitously, I set up a wireless router on the network yesterday. It gives out its own DHCP and has its own separate public IP. Computers using this router do not experience connectivity issues to our hosted sites.
This makes me think the Cisco firewall is at fault, or misconfigured. I'm wondering if it has some old routing tables which need to be cleared. I have tried 'clear xlate', 'clear local-host', and 'clear route'. The problem still persists.
Any firewall experts out there see an obvious thing I'm missing?