Firewall configuration
Digi TransPort User Guide 656
Filter rules
The syntax for a filter rule is:
[action] [in-out] [options] [tos] [proto] [dnslist] [ip-range] [inspect-state]
• When the firewall is active, the script is processed one line at a time as each packet is received
or transmitted.
• Even when a packet matches a filter-rule, processing still continues and all the other filter
rules are checked until the end of the script is reached.
• The action taken on a particular packet is that specified by the last matching rule.
• With the break option, the script processing can be redirected to a new location or to the end
of the script if required.
• The default action that the firewall assigns to a packet is to block. This means if the packet
does not match any of the rules, it is blocked.
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