User's Manual

UTT Technologies Chapter 5 System Status
http://www.uttglobal.com Page 52
 Tx Packets: It displays the number of packets uploaded by the LAN host through
NAT function.
 Tx Broadcast Packets: It displays the number of broadcast and multicast packets
transmitted from the LAN host to the Device.
 Total Sessions: It displays the total number of NAT sessions of the LAN host, which
include those sessions that aren¶t being used now.
¾ Clear: Click it to clear the NAT statistics in the list, which include Overflow, Rx
Packets, Tx Packets, Tx Broadcast Packets and Total Sessions.
¾ Refresh: Click it to view the latest information in the list.
Note
1. The NAT session limit feature can help the Device prevent some types of network
attacks. If a user¶s Total Sessions has reached the maximum value (configured in
the Security > NAT Session Limit page), any further request for creating a new
session will be discarded, and the Overflow will be updated synchronously. In this
case, the administrator can find potential DDoS attacks by viewing the logs in the
Status > System Log page.
2. The most Rx Packets means the corresponding user has downloaded the most
packets from the Internet.
3. The most Tx Packets means the corresponding user has uploaded the most packets
to the Internet.
4. The most Active Sessions means the corresponding user is the most active now.
5. If the Overflow is larger than 100, or the Tx Packets is far larger than the Rx
Packets, this host is suspicious of using port scanner software now.
6. If the Tx Packets is very large, but the Rx Packets is very small or zero, this host is
suspicious of performing a DoS/DDoS attack.