ELSA Lancom DSL/10 Office Manual page 93

The LAN port filters are defined in a table with the following layout::
Idx. D-st. D-end S-st.
WIN 0 0
The table fields have the following meaning:
Idx.
K
Unique index. This entry is required to enable the filters to be distinguished. The
index may be four characters long and selected as desired.
D-st., D-end
K
Destination port range that is to be filtered. A range of 0 to 0 means that no
destination port is affected by this filter.
S-st., S-end
K
Source port range that is to be filtered. A range of 0 to 0 means that no source port
is affected by this filter.
Src-address, Src-netmask
K
A subnetwork of the local network for which the filter is valid can be entered here.
A source address of 0.0.0.0 means that the filter is applied to all computers. A
network mask of 0.0.0.0 means that the filter is applied to all networks (which also
means all computers).
Prot
K
Protocol that is to be filtered. Possible entries are TCP, UDP, ICMP and all.
The setting all filters out every packet from the specified source network or to the
destination network.
Type
K
Filter type. The possible values are Always-filt., Connect-filt. and Internet-filt.
– Always filter: The packet is discarded.
– Connect filter: The packet is discarded if there is no connection to the remote
station.
– Internet filter: The packet is discarded if its destination can be accessed only via
the default route.
The default filter is entered in the above table. It suppresses the unwanted and cost-
intensive connections in Windows networks on IP. These networks regularly send items
such as DNS queries to the local network, which are routed to the Internet without this
filter.
Description of the menu options
S-end Source
137 139 255.255.255.255 0.0.0.0
Src-netmask Prot
TCP and
UDP
ELSA LANCOM DSL/10 Office
R37
Type
Always-
filt.