I have a client using a PIX 515 Firewall with some static entries in my PIX Configuration, similar to the following example:
static (public,outside) 209.145.50.125 173.15.6.2 netmask 255.255.255.255 0 0
These static entries are for web servers. Every couple of months or so, I encounter a situation where one of the web servers with a static entry is not accesible via its public IP address (ex. 209.145.50.125), nor can you ping any other web servers in the DMZ zone (ex. 173.15.6.3)
To resolve this I simply remove the static entry for that particular web server having a problem, and then add it again. This works well, but can anyone explain to me why this is happening and what I can possibly do to prevent this?
Thanks!