ELSA Lancom DSL/10 Office Manual page 96

R40 Description of the menu options
R1-mask If RIP-1 is set, this option allows you to influence the management of network masks.
Therefore, these settings are required only for subnetting under RIP-1. The different
settings have the following meaning:
Class (default): The network mask used in the RIP packet is derived directly from the
K
IP address class, i.e. the following network masks are used for the network classes:
– Class A: 255.0.0.0
– Class B: 255.255.0.0
– Class C: 255.255.255.0
Address: The network mask is derived from the first bit that is set in the IP address
K
entered. This and all high-order bits within the network mask are set. Thus, for
example, the address 127.128.128.64 yields the IP network mask 255.255.255.192.
Cl+Addr: The network mask is formed from the IP address class and a part attached
K
after the address procedure. Thus, the above-mentioned address and the network
mask 255.255.0.0 yield the IP network mask 255.128.0.0.
This option allows you to display the entries in the current dynamic IP routing table.
Table-RIP
An IP-RIP routing table might, for example, have the following appearance:
IP-address
223.245.254.0
223.245.257.0
Setup/IP-router-module/Masquerading
This menu allows you to enter settings for the masking function. The menu has the
following layout:
/Masquerading
TCP-aging-second(s)
UDP-aging-second(s)
ICMP-aging-second(s)
Service-table
Table-masquerading
The use of inverse masquerading makes 'services' (e.g. a file server) selectively visible in
Service-table
the Internet by entering specified ports in the service table in the IP network, while all
other services and computers remain invisible from the local network (see also
ELSA LANCOM DSL/10 Office
IP netmask
255.255.255.0
255.255.255.0
Settings for IP masquerading
Time in seconds after which a TCP masking becomes invalid
Time in seconds after which a UDP masking becomes invalid
Time in seconds after which an ICMP masking becomes invalid
Static masquerading table
Dynamic masquerading table
Time Distance Router
1 1 192.38.9.100
1 1 192.38.9.200