Configuring the IPCP Netmask Option for Each PPP Interface

You can optionally enable the IPCP netmask option (option 0x90) on a per-PPP interface basis explicitly, either in a profile or on a static interface. By default, the IPCP option 0x90 is disabled on the interface. The IPCP netmask option is a nonstandard option that enables a peer to request the netmask associated with the assigned IP address. The netmask can be specified via RADIUS attribute 9, Framed-Ip-Netmask. If the netmask is 255.255.255.255, the option is not negotiated. You can enable the IPCP netmask option from the Interface Configuration Mode, Subinterface Configuration mode, and Profile Configuration Mode.

To enable the IPCP netmask option for each PPP interface:

• (Optional) From the SubInterface Configuration mode, enable the IPCP lockout option:
  host1(config-subif)#ppp ipcp netmask

  Use the no version to disable the IPCP netmask option on the interface.