Enterasys Networks CSX7000 User Manual download pdf (Page 469)

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Central Site Remote Access Switch 469

ERIFYING

YSTEM

PTIONS

D Channel Callback

VERIFICATION OF IP ADDRESS POOL

As IP addresses are obtained from DHCP servers, they are placed into the system’s IP Address

Pool. To verify the presence of these DHCP-obtained IP addresses, perform the following:

1. Examine the address pool. Type:

ip addrpool

2. Look for addresses with an origin of DHCP. This verifies that IP addresses were obtained from

a DHCP server, and the Proxy Client is working correctly.

3. If no “DHCP-obtained” addresses are present in the IP Address Pool, try the following:

a. Check the DHCP-related configuration for WAN and WAN (Direct Host) IP network

interfaces which should have IP addresses obtained from DHCP servers for them. Use

CFGEDIT, or use the

ipnetif

command from Manage Mode. Correct if necessary.

b. Make sure that the LAN port to reach the DHCP server on for the interface is correct.

c. If the DHCP server is on a directly-connected LAN, you should be able to

ping

successfully from the CyberSWITCH. If you cannot, check the LAN port IP configuration;

make sure the DHCP server is operational.

d. If the DHCP server is not on the directly-connected LAN, a DHCP Relay Agent must be. A

relay agent is required in order to successfully forward DHCP packets to a DHCP server

on a different sub-network.

e. Assuming that a DHCP Relay Agent is present on the directly-connected LAN, you can

attempt to

ping

the DHCP server. This may require the addition of IP static routes on both

the CyberSWITCH and the DHCP server. These static routes are required for smooth

operation of the DHCP protocol.

f. If the DHCP server is not on a directly-connected LAN, another test may be performed. If

at all feasible, place a DHCP client workstation on the same LAN with the server. See if this

DHCP client can obtain an IP address from the DHCP server.

D CHANNEL CALLBACK

1. On the CyberSWITCH:

a. Make sure you are using the Connection Services Manager (CSM) for device

authentication.

b. Make sure you have enabled D Channel callback.

2. Define the calling devices on CSM. For each calling device configured through CSM, make sure

you:

a. Configure the device as an ISDN connection (under the device’s Telephone tab).

b. Configure the telephone number to be used to call back to the calling device (under the

device’s Telephone tab).

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Enterasys Networks CSX7000 User Manual Page 469

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