When configuring TransPort routers, you may need to change a parameter on an active PPP interface (ADSL or Cellular). However, after making the change, you may notice that the parameter change appears to have made no difference. This is because PPP configuration parameters are read as the PPP interface is activated (transitioned from DOWN to UP) and a number of parameters are negotiated with the service provider during activation.
After making changes to PPP interfaces, it is required that the interface is de-activated and re-activated.
This can be done via the GUI by browsing to:
Management - Network Status > Interfaces > Advanced > PPP > PPP x
Where x is the PPP interface number, by default this is:
WR21, WR41, WR44 = PPP 1 (Cellular)
DR64 = PPP 1 (ADSL), PPP 2 (ISDN), PPP 3 (Cellular), PPP 4 (PSTN)
When viewing the network status page for the PPP interface, you will see:
The interface uptime
IP address information
2 buttons at the top of the page to drop and raise the PPP interface
By default, all PPP interfaces are configured as 'Always on', this means that if the PPP interface is de-activated for any reason, the PPP interface will automatically re-activate.
To de-activate and re-activate the PPP interface after making configuration changes, simply click the 'Drop link' button on this page, the PPP interface will de-activate and automatically re-activate.
Or, to do the same via the CLI (Serial, telnet or SSH), the command to use is:
ppp x deact_rq
Where x is replaced with the interface number (if unsure see defaults detailed above).
For example, to bounce PPP 1:
ppp 1 deact_rq
Note: It is mainly the negotiated PPP parameters that will require the PPP interface to be bounced after making changes. Non-negotiated changes, such as enabling or disabling top talkers and enabling or disabling the firewall on the PPP interface will have immediate effect and do not require the PPP interface to be bounced.
Mar 22, 2019