ZyXEL P-2602HW-61 User Guide - Page 186
ICMP Vulnerability, 4.2.2, Illegal Commands NetBIOS and SMTP
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P-2602H(W)(L)-DxA Series User's Guide Figure 101 Smurf Attack 13.4.2.1 ICMP Vulnerability ICMP is an error-reporting protocol that works in concert with IP. The following ICMP types trigger an alert: Table 67 ICMP Commands That Trigger Alerts 5 REDIRECT 13 TIMESTAMP_REQUEST 14 TIMESTAMP_REPLY 17 ADDRESS_MASK_REQUEST 18 ADDRESS_MASK_REPLY 13.4.2.2 Illegal Commands (NetBIOS and SMTP) The only legal NetBIOS commands are the following - all others are illegal. Table 68 Legal NetBIOS Commands MESSAGE: REQUEST: POSITIVE: VE: RETARGET: KEEPALIVE: All SMTP commands are illegal except for those displayed in the following tables. Table 69 Legal SMTP Commands AUTH DATA QUIT RCPT EHLO RSET ETRN SAML EXPN SEND HELO SOML HELP TURN MAIL VRFY NOOP 186 Chapter 13 Firewalls
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