OmniConnect / ISDN
User’s Manual
Page 50
Part number 613-10787-00
OmniConnect filtering also allows the selective disabling and enabling of certain Internet
applications such as WWW or FTP. Once Internet access is enabled, applications may be
selectively disabled or enabled by selecting or de-selecting the corresponding check boxes.
They are:
Web access (WWW):
By selecting the Allow Web Access (WWW) check box, all
incoming and outgoing Web access messages will be allowed by
the OmniConnect filters. To disable Web Access, de-select Allow
Web Access check box and all the OmniConnect filters will block
all Web access messages.
File transfers (FTP):
Selecting Allow File Transfers check box allows users to perform
file transfer functions over the Internet. De-selecting this option
may block file transfers.
Mail access (SMTP):
Control the mail messages to and from the Internet by selecting or
de-selecting this check box.
File system mounting:
The Network File System (NFS) protocol allows users to share
complete file systems with other computers on Internet. This
feature may be allowed or blocked by controlling this option check
box.
Remote login (telnet):
Internet TCP-IP protocol suite has a remote login protocol, which
allows computers to login into other computers remotely. This
protocol may be blocked or allowed by selecting or de-selecting
this feature.
Appendix C contains a list of commonly used TCP and UDP port numbers and their
applications.
6.3.5.
Advanced filter setup
This screen is used to configure advanced filtering options for the OmniConnect/ISDN access
device. A total of 10 advanced filter sets (numbered from 1 to 10) may be configured.
Selection of one of the ten filters is accomplished by using the pull down menu labeled
Filter
Number
. Once the correct filter number has been selected, the various filter options for that
particular filter number may be configured.
Note:
Filter 1 has been preset to filter NetBIOS requests that may be causing the
OmniConnect access device to dial erroneously. To enable this filter, select the
Filter Enabled check box. See the troubleshooting section for more detail.
The
Filter Direction
indicates the direction in which the filter will be applied. The
OUTGOING direction is for packets flowing from the LAN (10Base-T Ethernet) to WAN
(ISDN) interface. The INCOMING direction is for packets flowing from WAN (ISDN)
interface to the LAN (10Base-T Ethernet). The allowed values are INCOMING, OUTGOING
or BOTH
The
Filter Enabled
box should be checked to enable the filtering for the particular Filter
Number. If the Filter Enabled box is checked, filtering is enabled. Enabling a filter causes
packets matching the filtering criteria to be dropped or forwarded, depending upon the state of
the Forward Enabled check box. If the Filter Enabled box is not checked, all the windows in
this screen with the exception of the Filtern Number are disabled.
The
Forward Enabled
parameter should be checked to enable forwarding. If the Forward
Enabled parameter is checked, then packets matching the filter criteria are forwarded. If the
