ZyXEL P-660HW-T1 v2 User Guide - Page 142
ICMP Vulnerability, 4.2.2, Illegal Commands NetBIOS and SMTP
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P-660HW-T v2 User's Guide Figure 81 Smurf Attack 9.4.2.1 ICMP Vulnerability ICMP is an error-reporting protocol that works in concert with IP. The following ICMP types trigger an alert: Table 49 ICMP Commands That Trigger Alerts 5 REDIRECT 13 TIMESTAMP_REQUEST 14 TIMESTAMP_REPLY 17 ADDRESS_MASK_REQUEST 18 ADDRESS_MASK_REPLY 9.4.2.2 Illegal Commands (NetBIOS and SMTP) The only legal NetBIOS commands are the following - all others are illegal. Table 50 Legal NetBIOS Commands MESSAGE: REQUEST: POSITIVE: VE: RETARGET: KEEPALIVE: All SMTP commands are illegal except for those displayed in the following tables. Table 51 Legal SMTP Commands AUTH DATA QUIT RCPT EHLO RSET ETRN SAML EXPN SEND HELO SOML HELP TURN MAIL VRFY NOOP 142 Chapter 9 Firewalls