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ZyXEL Communications 652 User Manual

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Prestige 652 ADSL Security Router
11-6
Using the Prestige Web Configurator
Figure 11-3 E-mail Log
11.4 Attack Alert
Attack alerts are the first defense against DoS attacks. In the Attack Alert screen, shown later, you may
choose to generate an alert whenever an attack is detected. For DoS attacks, the Prestige uses thresholds to
determine when to drop sessions that do not become fully established. These thresholds apply globally to all
sessions.
You can use the default threshold values, or you can change them to values more suitable to your security
requirements.
11.4.1 Threshold Values
Tune these parameters when something is not working and after you have checked the firewall counters.
These default values should work fine for normal small offices with ADSL bandwidth. Factors influencing
choices for threshold values are:
1.  The maximum number of opened sessions.
Subject:
        Firewall Alert From Prestige
   Date:
        Fri, 07 Apr 2000 10:05:42
   From:
        user@zyxel.com
     To:
        user@zyxel.com
  1|Apr  7 00 |From:192.168.1.1     To:192.168.1.255   |default policy
|forward
   | 09:54:03 |UDP     src port:00520 dest port:00520  |<1,00>          |
  2|Apr  7 00 |From:192.168.1.131   To:192.168.1.255   |default policy
|forward
   | 09:54:17 |UDP     src port:00520 dest port:00520  |<1,00>          |
  3|Apr  7 00 |From:192.168.1.6     To:10.10.10.10 |match           |forward
   | 09:54:19 |UDP     src port:03516 dest port:00053  |<1,01>          |
……………………………..{snip}…………………………………..
……………………………..{snip}…………………………………..
126|Apr  7 00 |From:192.168.1.1     To:192.168.1.255   |match
|forward
   | 10:05:00 |UDP     src port:00520 dest port:00520  |<1,02>          |
127|Apr  7 00 |From:192.168.1.131   To:192.168.1.255   |match
|forward
   | 10:05:17 |UDP     src port:00520 dest port:00520  |<1,02>          |
128|Apr  7 00 |From:192.168.1.1     To:192.168.1.255   |match
|forward
   | 10:05:30 |UDP     src port:00520 dest port:00520  |<1,02>          |
End of Firewall Log
The date format here
is Day-Month-Year.
The date format here
is Month-Day-Year.
The time format is
Hour-Minute-Second.
"End of Log" message
shows that a complete
log has been sent.
You may edit the
subject title