ZyXEL Communications NBG420N - Manual (Page 238)

Chapter 21 Logs
NBG420N User’s Guide
238
Table 89 System Error Logs
LOG MESSAGE DESCRIPTION
%s exceeds the max.
number of session per
host! This attempt to create a NAT session exceeds the maximum
number of NAT session table entries allowed to be created per
host.
setNetBIOSFilter: calloc
error The router failed to allocate memory for the NetBIOS filter
settings.
readNetBIOSFilter: calloc
error The router failed to allocate memory for the NetBIOS filter
settings.
WAN connection is down. A WAN connection is down. You cannot access the network
through this interface.
Table 90 Access Control Logs
LOG MESSAGE DESCRIPTION
Firewall default policy: [TCP |
UDP | IGMP | ESP | GRE | OSPF]
Attempted TCP/UDP/IGMP/ESP/GRE/OSPF access
matched the default policy and was blocked or forwarded
according to the default policy’s setting.
Firewall rule [NOT] match:[TCP |
UDP | IGMP | ESP | GRE | OSPF]
, Attempted TCP/UDP/IGMP/ESP/GRE/OSPF access
matched (or did not match) a configured firewall rule
(denoted by its number) and was blocked or forwarded
according to the rule.
Triangle route packet forwarded:
[TCP | UDP | IGMP | ESP | GRE |
OSPF] The firewall allowed a triangle route session to pass
through.
Packet without a NAT table entry
blocked: [TCP | UDP | IGMP | ESP
| GRE | OSPF] The router blocked a packet that didn't have a
corresponding NAT table entry.
Router sent blocked web site
message: TCP The router sent a message to notify a user that the router
blocked access to a web site that the user requested.
Table 91 TCP Reset Logs
LOG MESSAGE DESCRIPTION
Under SYN flood attack,
sent TCP RST The router sent a TCP reset packet when a host was under a SYN
flood attack (the TCP incomplete count is per destination host.)
Exceed TCP MAX
incomplete, sent TCP RST The router sent a TCP reset packet when the number of TCP
incomplete connections exceeded the user configured threshold.
(the TCP incomplete count is per destination host.) Note: Refer to
TCP Maximum Incomplete in the Firewall Attack Alerts screen.
Peer TCP state out of
order, sent TCP RST The router sent a TCP reset packet when a TCP connection state
was out of order.Note: The firewall refers to RFC793 Figure 6 to
check the TCP state.