ZyXEL Communications 650 Series - Manual (Page 494)

Prestige 650 Series User’s Guide
H-4 Log Descriptions
Chart H-4 Access Logs
LOG MESSAGE DESCRIPTION
ICMP Destination
Unreachable
The Prestige sent or received an ICMP Destination Unreachable
packet when a packet was dropped because the target port was not
open.
Packet without a NAT
table entry blocked
(Protocol)
The router blocked a packet that did not have a corresponding NAT
table entry.
Out of order TCP
handshake packet
blocked (Protocol)
The router blocked a TCP handshake packet that came out of the
proper order
Unsupported/out-of-
order ICMP (Protocol)
The Prestige generates this log after it drops an ICMP packet due to
one of the following two reasons:
1. The Prestige does not support the ICMP packet's protocol.
2. The ICMP packet is an echo reply for which there was no
corresponding echo request.
Router reply ICMP
packet
The router sent an ICMP response packet. This packet automatically
bypasses the firewall.
Remote access denied The router blocked a remote access attempt.
Chart H-5 TCP Reset Logs
LOG MESSAGE DESCRIPTION
Firewall sent TCP
reset packets
The firewall sent out TCP reset packets.
Chart H-6 ICMP Notes
TYPE CODE DESCRIPTION
0 Echo Reply
0 Echo reply message
3 Destination Unreachable