ZyXEL Communications ZyXEL Prestige 660R, User Manual

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Prestige 660R ADSL 2+ Access Gateway
G-2 Log Descriptions
Access logs may include the following information:
(Protocol) is the protocol of the packet (for example TCP or UDP) that triggered the log.
(Direction) is the direction in which the packet was traveling (for example LAN to WAN or WAN
to LAN)
Chart G-2 Access Logs
LOG MESSAGE DESCRIPTION
ICMP Source Quench The Prestige sent or received an ICMP source quench packet to tell a
host to slow down data transmission.
ICMP Time Exceed The Prestige sent or received an ICMP Time Exceed packet because
a packet with zero Time To Live (TTL) was dropped.
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.
Remote access denied The router blocked a remote access attempt.
Chart G-3 ICMP Notes
TYPE CODE DESCRIPTION
0 Echo Reply
0 Echo reply message
3 Destination Unreachable