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| Configuration: |
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| Advanced TCP/IP |
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LAN Configuration fields and buttons (continued) |
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Field or Button | Description |
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Enable DHCP Server | If selected, the DHCP server on the voice gateway assigns IP addresses to the computers | |
| and other hosts on your network, if they have DHCP enabled (see “Configuring TCP/IP” on | |
| page 52). By default, the voice gateway DHCP server is enabled. | |
| If there is another DHCP server running on your network (on another router), you must | |
| disable one of the DHCP servers. | |
Enable ISP | If Enable DHCP Server is selected, selecting this option causes the systems on the VT2142 | |
DNS,SNTP | LAN to use the domain name system (DNS) on the WAN side. Each system on the LAN is | |
| provided with: | |
| • | IP address 192.168.15.x |
| • | Gateway: 192.168.15.1 |
| If Enable IPS DNS,SNTP is selected, the ISP may also transmit other data to the computers | |
| on the VT2142 LAN, including, but not limited to, the time, log, cookie, print, NTP, and WINS | |
| servers. | |
Start IP | Sets the first IP address assigned by the DHCP server, in | |
| greater than the IP address value of the voice gateway. For example, if the IP address of the | |
| voice gateway is 192.168.15.1 (default), the starting IP address must be 192.168.15.2 (or | |
| higher). | |
End IP | Sets the final IP address assigned by the DHCP server, in | |
| exceed the subnet limit of 254. For example, the default is 192.168.15.254. If the DHCP | |
| server runs out of DHCP addresses, users cannot access network resources. If this happens, | |
| increase the End IP (to the limit of 254) or reduce the Lease Time. | |
| If you change Start IP or End IP, be sure they are in the range for specified by the Subnet IP | |
| Address and Netmask. For example, if the voice gateway IP address is 192.168.15.1 (the | |
| default) and you set Start IP and End IP to 192.168.0.2 and 192.168.0.100, respectively, | |
| computers with DHCP enabled cannot communicate with the voice gateway. | |
Lease Time | Sets the time, in seconds, that a network computer remains connected to the voice gateway | |
| using its current assigned IP address. At the end of this time, the DHCP server renews the | |
| lease or assigns the computer a new IP address. The default is 3600 seconds (1 hour). The | |
| maximum is 999999 seconds (about 278 hours). | |
Enable DHCP Relay | If selected, the voice gateway forwards requests and responses between the computers on | |
| your network (the DHCP clients) and the DHCP server you chose to use for your network. | |
Relay IP | If you select Enable DHCP Relay, type the IP address of the DHCP server in | |
| format. | |
Server and Relay Off | If selected, you must carefully configure the IP address, Subnet Mask, and DNS settings of | |
| every host on your network. Do not assign the same IP address to more than one host. Your | |
| voice gateway must be on the same subnet as the other hosts. | |
VT2142 Voice Gateway User Guide | 21 |