Our client needs to setup an incoming filter on port 25 from their ISPs mail cluster.
The router is a vigor 2600 and the mail cluster has muliple IP addresses that sometimes change. As a result, we cannot specify single IP addresses.
For example, we would like to allow:
212.23.3.x and 212.23.6.x
Is this possible on the 2600 or as we suspect will they have to upgrade to a 2820?