Filters; Outgoing Traffic Filters - Inter-Tel EncoreCX Manual

EncoreCX
Internet Module Manual

Filters

A filter stack comprising of up to 16 filters can be defined for outgoing and incoming traffic. Each
filter contains fields whose contents are compared to every IP packet passing through the firewall. If
the contents of any field match the corresponding information in an IP packet, the packet is either
blocked or allowed to pass through to the next filter in the stack. The next filter carries out a similar
operation using the criteria defined in its fields and so on.

Outgoing Traffic Filters

·
Select Outgoing Traffic Filters on the Firewall screen. The following screen is displayed.
Each field is programmable as follows:
·
Inc (Include)
A ain this box indicates that a filter is enabled and that the contents of its fields are compared to
every IP packet. If the box is not checked, then the filter is not applied.
·
No (Number)
Each filter is numbered from 1 - 16. This field is not programmable.
·
Act (Action)
This field has a drop-down menu with two items. Selecting
contents match any of the remaining fields in the filter. Selecting r blocks any packet whose
contents match any of the fields in the filter.
·
Prot (Protocol)
This field defines a protocol and has a drop-down menu with four items.
ALL - the filter operates on packets which contain the UDP, TCP or ICMP protocols.
UDP - the filter operates on packets which contain the UDP protocol.
ICMP - the filter operates on packets which contain the ICMP protocol.
TCP - the filter operates on packets which contain the TCP protocol.
·
Source Address
The filter compares the source address of the IP packets with the address specified in this field.
14
a
allows any packet through whose