Configuring Protocol Settings for a WAN Interface

If you specified a PPPoE, PPTP, or L2TP for IP assignment when configuring the WAN interface, the Edit Interface dialog displays the Protocol view.

The Internet Service Provider (ISP) provisions the fields (for example, SonicWall IP Address, Subnet Mask, and Gateway Address) in the Settings Acquired via section of the Protocol view. These fields show actual values after you connect the appliance to the ISP.

Additionally, specifying PPPoE causes SonicOS to set the Interface MTU option in the Advanced view to 1492 and provides additional settings in the Protocol view.

To configure additional settings for PPPoE

1. In the Edit Interface dialog, click Protocol.
2. Enable the following options in the PPPoE Client Settings section:
   • Inactivity Disconnect (minutes): Enter the number of minutes (the default is 10) after which SonicOS terminates the connection when it detects that packets are not being sent. This option is not selected by default.
   • Strictly use LCP echo packets for server keep-alive: Select this to have SonicOS terminate the connection if it detects that the PPoE server has not sent a ppp LCP echo request packet within a minute. Select this option only if your PPPoE server supports the send LCP echo function. This option is not selected by default.
   • Reconnect the PPPOE client if the server does not send traffic for __ minutes: Enter the number of minutes (the default is 5) after which SonicOS terminates the PPPoE server's connection, and then reconnects, if the server does not send any packets (including the LCP echo request). This option is selected by default.

   • If your PPPoE connectivity is not stable, you can amend the Ncp Retrans Time. SonicWall suggests changing this figure to 2000, but you could have better results making it 1999.