[Responding to two posts]
So - if some dial-up/dynamic PC gets infected, that IP address will likely be assigned to someone else who happens to connect tomorrow? Is your test eliminating any "dial-up/dynamic" IPs, since by definition the infected/spam workstation will change IPs?
But, by definition, those IPs are guaranteed to be dynamic -- and therefore shouldn't be sending E-mail directly, without the assistance of an MTA.
How do you account for businesses using Internet gateways, firewalls, NAT routers etc where one IP address could feasible represent a large number of different workstations?
If a business has infected computers, and the business allows those infected computers to send out viruses through the firewall on the same IP that outgoing legitimate E-mail goes on, they have serious problems. They would need to fix the problems, and request removal of their IP.
> Considering that most administrators will block ANY TCP/IP traffic from/to a > server and only open exactly those 2 or 3 ports that are needed for its > primary function, you can assume that trying to "ping" will not be permitted > - thus preventing install.
Not true -- a good admin will allow ICMP traffic through, *unless* they believe it to be a specific security risk.
As a rule of thumb, when people ask me for assistance regarding troubles reaching a computer and I can't ping it, I tell them that it can't be pinged, and they have to take care of it from there. If you disable a vital networking tool, you need to accept the consequences.
On the other hand, I don't believe an install program should need to use ICMP traffic, and I have passed this information on to the developer of the install program.
-Scott
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