No Forward Close IP address verification

The stack does not check the IP address of the sender of the forward close frame. This means that a running connection can be close by a device that did not open the connection.

[Vol 2 Ed 1.17 3-3.10] "EtherNet/IP targets and CIP routers must verify that the IP address of the sender matches the IP address of the sender that opened the connection. If the IP address does not match, the target or router shall return an error with a General Status code of 0x0F (Privilege Violation)."