Icmp Vulnerability; Illegal Commands (Netbios And Smtp); Figure 56 Smurf Attack; Table 38 Icmp Commands That Trigger Alerts - ZyXEL Communications Prestige 660H Series User Manual
802.11g wireless adsl2+ 4-port security gateway
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Prestige 660H/HW Series User's Guide
Figure 56 Smurf Attack
12.4.2.1 ICMP Vulnerability
ICMP is an error-reporting protocol that works in concert with IP. The following ICMP types
trigger an alert:
Table 38 ICMP Commands That Trigger Alerts
5
13
14
17
18
12.4.2.2 Illegal Commands (NetBIOS and SMTP)
The only legal NetBIOS commands are the following - all others are illegal.
Table 39 Legal NetBIOS Commands
MESSAGE:
REQUEST:
POSITIVE:
VE:
RETARGET:
KEEPALIVE:
All SMTP commands are illegal except for those displayed in the following tables.
135
REDIRECT
TIMESTAMP_REQUEST
TIMESTAMP_REPLY
ADDRESS_MASK_REQUEST
ADDRESS_MASK_REPLY
Chapter 12 Firewalls
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