CR-SEH
Note: If IP Address control has been enabled, the telnet session must be initiated from an IP
Address that is on the Allowed IP Address list.
A telnet window will open up. The first line is the version of the CR-SEH firmware followed by the
prompt:
SEM>
If the CR-SEH is to transmit data to devices not on its subnet, a default router must be specified. To enter
the default routing address use the
route
command.
route add default <xxx.xxx.xxx.xxx> {yyy.yyy.yyy.yyy}
Where x is the IP address of the gateway device and y is the optional netmask number.
To configure a CR-SEH as a master device, use the
bridge
command:
bridge master<CR>
Store the changed configuration parameters in non-volatile memory with the
save
command:
save<CR>
The CR-SEH will report back the time it took to the save the information. Reset the CR-SEH by typing:
reset<CR>
The CR-SEH can also be reset by cycling power. Whenever a reset is executed on the CR-SEH, the telnet
session will be lost. It will take the CR-SEH about 30 seconds to reinitialize after a reset or after cycling
power.
Note: Failure to save and reset will result in the factory defaults being used.
Filtering
The CR-SEH includes provision for filtering of multicast and broadcast packets. In many networks, there
are sufficient multicast and/or broadcast packets to slow the overall performance of the CR-SEH. Based
on the number of broadcast and multicast packets, they can consume a substantial amount of the RF
bandwidth. By turning filtering on, the CR-SEH will ignore these packets and limit transmission to
packets with specific device addresses. In some instances, it is desirable to have the CR-SEH transmit the
multicast and broadcast packets; in such cases, filtering should be disabled. Note that filtering broadcast
packets also filters multicast packets but filtering multicast packets does not filter broadcast packets. To
filter broadcast and multicast packets use the bridge filter command:
bridge filter bcast<CR>
Refer to the section
Bridge Commands
for details of the filter commands.
DHCP
A DHCP server can set the CR-SEH IP address as well as the default route IP address. This is
accomplished by setting the desired default route IP address in the DHCP server using Option 3.
A DHCP server will not overwrite a previously entered default router IP address in the CR-SEH.
If a DHCP server is not used to set the default router IP address, one must be entered using the
route
command. See the previous section for details of the route command. If an IP address has
previously been entered into the CR-SEH but a DHCP server is to be used to assign an IP
address, it will be necessary to set the IP address in the CR-SEH to 0.0.0.0 using the
ip
command.
2000- 2004 Cirronet
Inc
15
M-2411-0013 Rev A
