AT&T Syn248 SB35020, Installation And Configuration Manual

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Syn248 Installation and Configuration Guide Back to Contents
Appendixes 104
Appendix B: IP Addresses and Connectivity
An IP address is an individual numeric identification assigned to devices on a computer
network. At least one Syn248 device needs a network-assigned IP address on the subnet
shared with any computers that will allow access to the WebUI. Valid IP addresses on the
same subnet allow devices on the network to identify each other and enable
communication.
This IP address may be assigned from a Dynamic Host Configuration Protocol (DHCP)
server, or set statically to the same subnet, and will be separate from the self-assigned
169.254.xxx.xxx link-local address that the Syn248 devices use to communicate with
each other. When setting up the IP address on a Syn248 device, this network IP address
used for WebUI connectivity is the only address you can change.
The network IP addresses can be assigned in two ways:
1. The Syn248 device can request a network server to automatically assign an IP
address. This IP address is a dynamic assignment; the address is on lease from the
server. The lease is renewed as long as the device remains connected and there is
no change to the network. However, if the device is disconnected, or if there is a
network or AC power interruption, the lease may not be renewed (that is, the IP
address expires) and a new IP address may be assigned.
Most LANs use servers to automatically assign IP addresses. Syn248 defaults to
assuming that this automatic assignment will occur.
2. The Syn248 system administrator can manually assign a static system IP address. This
IP address does not change, even when there are network or AC power interruptions.
Some installations will require manual static IP assignment. You can assign a static
IP address for a Gateway using the device front panel interface. See
“Gateway
Configuration” on page 74 . You can assign a static IP address for a Deskset from the
Deskset IP Settings menu. See “IP Settings” on page 80 .
Some servers have default settings that limit the number of network IP
addresses assigned to devices on the network. You should log in to your server
to confirm that the IP range is sufficient to accommodate at least one of the
Syn248 devices that you are adding as at least one Syn248 device needs an
assigned IP address to enable WebUI configuration activities. Consult the IT
department if you need help checking the server.