Firewall messages are displayed any time an Adtran router drops a packet or a special firewall event occurs. These will pop up in any situations as there are common mis-configurations on user units that can cause malformed packets that our firewall will get rid off. It will obviously also drop packets it feels are malicious.
The first message is an ICMP message of type 8 which is an echo reply. The firewall is simply stating here that it recieved an echo reply from something that it didn't see an echo request from. This is a common message.
The second is a "connection timeout message" which will happen when a session is dropped for some reason or becomes idle for too long. This, since it shows protocol ICMP, could have been a ping that was sent out opening a session, the response never came, and so the firewall shut down the session so that an illegitimate packet could not be matched to it.
The third message is a "connection closed" message. This will have when the firewall closes a session on its own. It can do this for many reasons, being it feels that the session is done, neither side is responding anymore, or something in the session like source and destination IPs don't match.
These are all common messages and I would not be concerned with them unless you are actually having network problems, or the same IPs frequently show up in messages. If they do, you may want to check those devices for possible security breaches.
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