# nterface Screen Counters

The NetScreen device provides screen counters for monitoring general firewall behavior and for viewing the amount of traffic affected by specified policies.

### Viewing the Interface Screen Counters

- Select the interface for the counters you want to view in the Interface drop-down menu.

- Click Refresh whenever you want to update the screen counters with the most recent statistics.

### Interpreting the Interface Screen Counters

The Interface Screen Counters provide the following information:

Bad IP Option Detection: Indicates the number of frames discarded due to malformed or incomplete IP Options.

Block Fragment Traffic: Indicates the number of fragments blocked.

Block Java/Active X Component: Indicates the number of Java or Active X components blocked.

FIN bit with no ACK bit: Indicates the number of packets detected and dropped with an illegal combination of flags.

ICMP Flood Protection: Indicates the number of ICMP packets blocked as part of an ICMP flood.

ICMP Fragment: Indicates the number of ICMP frames with the More Fragments flag set, or with offset indicated in the offset field.

IP Loose Src Route Option: Indicates the number of IP packets detected with the Loose Source Route option enabled.

IP Record Route Option: Indicates the number of frames detected with the Record Route option enabled.

IP Security Option: Indicates the number of frames discarded with the IP Security option set.

IP Spoofing Attack Protection: Indicates the number of IP addresses blocked as part of an IP spoofing attack.

IP Strict Src Route Option: Indicates the number of packets detected with the Strict Source Route option enabled.

IP Stream Option: Indicates the number of packets discarded with the IP Stream identifier set.

IP Sweep Protection: Indicates the number of IP sweep attack packets detected and blocked.

IP Timestamp Option: Indicates the number of IP packets discarded with the Internet Timestamp option set.

Land Attack Protection: Indicates the number of packets blocked as part of a suspected land attack.

Large ICMP Packet: Indicates the number of ICMP frames detected with an IP length greater than 1024.

limit session: Indicates the number of undeliverable packets because the session limit had been reached.

Malicious URL Protection: Indicates the number of suspected malicious URLs blocked.

Ping-of-Death Protection: Indicates the number of suspected and rejected ICMP packets that are oversized or of an irregular size.

Port Scan Protection: Indicates the number of port scans detected and blocked.

Source Route IP Option Filter: Indicates the number of IP source routes filtered.

SYN and FIN bits set: Indicates the number of packets detected with an illegal combination of flags.

SYN Flood Protection: Indicates the number of SYN packets detected as part of a suspected SYN flood.

SYN Fragment Detection: Indicates the number of packet fragments dropped as part of a suspected SYN fragments attack.

SYN-ACK-ACK-Proxy DoS: Indicates the number of blocked packets because of the SYN-ACK-ACK-proxy DoS SCREEN option.

TCP Packet without Flag: Indicates the number of illegal packets dropped with missing or malformed flags field.

Tear-drop Attack Protection: Indicates the number of packets blocked as part of a tear-drop attack.

UDP Flood Protection: Indicates the number of UDP packets dropped as part of a suspected UDP flood.

Unknown Protocol Protection: Indicates the number of packets blocked as part of an unknown protocol.

WinNuke Attack Protection: Indicates the number of packets detected as part of a suspected winnuke attack.

Note: You can also view hardware counters that monitor hardware performance, and flow counters that monitor the number of packets inspected at the flow level. For more information, see Interface Statistics.