Configuring PPP callback in the C-DCC implementation
You can configure the router as a PPP callback client or server with C-DCC.
Configuration guidelines
If the network address used by a callback client is dynamically assigned, the server cannot use the dialer route command to associate the callback dial string with the network address for the client. Use the authorization-attribute callback-number command instead to associate the dial string with the client username for callback.
To leave enough time for a server to call back, set the interval for DCC to make the next call attempt on the client at least 10 seconds longer than that of the server. Hewlett Packard Enterprise recommends that you set the interval on the server to 5 seconds (the default) and that on the client to 15 seconds.
Configuring a PPP callback client in the C-DCC implementation
As a callback client, your router can place calls to the remote end (which can be a router or Windows NT server with the PPP callback server function), and receive return calls from the remote end.
To configure PPP callback client in the C-DCC implementation:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter dialer interface (physical or dialer interface) view. | interface interface-type interface-number | N/A |
3. Enable PPP encapsulation. | link-protocol ppp | N/A |
4. Configure authentication parameters. | See "Configuring PPP and MP." | N/A |
5. Enable PPP callback client. | ppp callback client | By default, PPP callback client is disabled. |
6. Configure the dial string for a Windows NT Server to call back. | ppp callback ntstring dial-number | Optional. By default, no dial string is configured for a Windows NT Server to call back. Configure this command if a Windows NT Server requires PPP callback clients to send callback numbers. |
7. Set the interval for DCC to make the next call attempt. | dialer timer enable seconds | Optional. Hewlett Packard Enterprise recommends that you use 15 seconds. |
Configuring a PPP callback server in the C-DCC implementation
As a callback server, your router can place return calls according to network addresses configured with the dialer route command (PPP authentication must be configured in this case), or according to the PPP callback numbers. You must select either approach with the dialer callback-center command.
Configure callback client usernames with the dialer route command, so the callback server can authenticate whether a callback client is valid when receiving a call from it.
To configure a PPP callback server in the C-DCC implementation:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter dialer interface (physical or dialer interface) view. | interface interface-type interface-number | N/A |
3. Enable PPP callback server. | ppp callback server | By default, PP callback server is disabled. |
4. Configure the PPP callback reference. | dialer callback-center [ user | dial-number ] * | N/A |
5. Configure a callback client username. | dialer route protocol next-hop-address [ mask network-mask-length ] user hostname [ broadcast ] [ dial-number [ autodial | interface interface-type interface-number ] * ] | N/A |
6. Exit to system view. | quit | N/A |
7. Configure either command depending on the keyword configured with the dialer callback-center command. |
| Use either method. |