IP Line administration using OTM 2.2 Page 663 of 910
IP Line Description, Installation and Maintenance
b. Management LAN gateway IP: This IP address is used to route to
the ELAN subnet. If OTM is not connected to the local ELAN subnet,
then it communicates with this node through the Management LAN
gateway. If changes are made to the gateway IP address and these
changes are not coordinated properly, OTM loses communication
with the node:
• When a Management LAN gateway is added to the ELAN
subnet, the gateway must restrict access so that only authorized
traffic is permitted on the ELAN subnet.
• The router must disable the BootP relay agent for the ELAN
network interface.
• The router must block all broadcast and multicast traffic from the
ELAN subnet and enable only proper access; that is, only
authorized traffic and users can come through the Management
LAN gateway. OTM is one of these users.
c. Management LAN subnet mask: When changing these subnet
masks, consider the possibility of conflict between the ELAN and
TLAN network interface IP addresses. Consult with the IP
administrator before making any changes to network interfaces. See
“Codecs” on page 287.
When changing the Management LAN (ELAN) network interface, the
change must be coordinated with the IP address on the Call Server
(Active ELNK) subnet. Changes must also be coordinated with the
following:
• Management LAN gateway, and other IP devices on the ELAN
subnet (for example, OTM if it is local)
• any other devices on the ELAN subnet and the customer’s
enterprise network that could need to communicate with IP Line
• devices that are looking to receive SNMP traps
d. Voice LAN subnet mask: Coordinate with Voice LAN gateway
(router). When changing the Voice LAN (TLAN) network interface
subnet mask, the change must be coordinated with changing the
subnet mask of the Voice LAN (TLAN) gateway (router) network
interface.
6Click Apply.
7Select the Configuration tab.