Digi TransPort WR31 User Manual page 705

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Configure security settings

Filtering on ICMP codes

An ip-object can be followed by an optional [icmp] field.

This field allows the script to filter packets based on ICMP codes. ICMP packets are occasionally

employed to debug and diagnose a network and can be extremely useful. However, they form

part of a low-level protocol and are frequently exploited by hackers for attacking networks. For

this reason, most network administrators want to restrict the use of ICMP packets.

The syntax for including ICMP filtering is:

icmp = "icmp-type" icmp-type ["code" decnum]

Can be one of the pre-defined strings listed in the following table or the equivalent decimal

numeric value:

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