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I reread your article after seeing some of the replies.
You want to know who is using x.x.x.5 so you can tell them to use the
newer more secure y.y.y.5, right?
And you want to phase this in so that you can see if you've totally muffed
up the new firewall? Therefore you don't just want to change your DNS
from x.x.x.5 to y.y.y.5?
Well, my answer is that the same technique will help you in several ways.
Find out all the ports currently being served by the existing address.
This will allow your network admin to ensure they are correct on the new
firewall.
The same technique used to determine these ports can also be used to find
out the remote addresses using these ports.
There are two ways to get this information. One way is by using
NETSTAT *CNN
There are a lot of function keys, like change the description of the port
to a number, show the local IP address (in your case x.x.x.5) and so on.
There is another way which the network admin may prefer. Have him use his
favorite query tool (or Run SQL Scripts) and have him use the
"NETSTAT_INFO view" or one of the other views at
https://www.ibm.com/support/knowledgecenter/en/ssw_ibm_i_73/rzajq/rzajqservicestcpip.htm
I think he will like the "NETSTAT_INFO view".
Rob Berendt
midrange.com
