Parkervision WR1500 User Manual download pdf (Page 85)

WR1500 4-Port Wireless DSL/Cable Router

11.4.2 Types of DoS Attacks - Continued

ICMP Vulnerability

ICMP is an error-reporting protocol that works in concert with IP. The following ICMP types

trigger an alert:

Illegal Commands (NetBIOS and SMTP)

The only legal NetBIOS commands are the following - all others are illegal.

All SMTP commands are illegal except for those displayed in the following table.

Traceroute

Traceroute is a utility used to determine the path a packet takes between two endpoints.

Sometimes when a packet ﬁ lter ﬁ rewall is conﬁ gured incorrectly an attacker can traceroute the

ﬁ rewall gaining knowledge of the network topology inside the ﬁ rewall.

4. Often, many DoS attacks also employ a technique known as “IP Spooﬁ ng” as part of

their attack. IP Spooﬁ ng may be used to break into systems, to hide the hacker’s identity, or

to magnify the effect of the DoS attack. IP Spooﬁ ng is a technique used to gain unauthorized

access to computers by tricking a router or ﬁ rewall into thinking that the communications are

coming from within the trusted network. To engage in IP spooﬁ ng, a hacker must modify the

packet headers so that it appears that the packets originate from a trusted host and should

be allowed through the router or ﬁ rewall. The WR1500 Wireless Router blocks all IP Spooﬁ ng

attempts.

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Parkervision WR1500 User Manual Page 85