The IPINIP_CONFIG_INFO structure MAY<31> be used to specify configuration information for an IP in an IP tunnel.

 typedef struct _IPINIP_CONFIG_INFO {
   DWORD dwRemoteAddress;
   DWORD dwLocalAddress;
   BYTE byTtl;
 } IPINIP_CONFIG_INFO,
  *PIPINIP_CONFIG_INFO;

dwRemoteAddress: The destination address of the IP in the IP packet.

dwLocalAddress: The source address of the IP in the IP packet.

byTtl: The TTL field for the IP in the IP packet.

When this structure is used, the InfoType of RTR_TOC_ENTRY (section 2.2.1.2.4) MUST be 0xFFFF000C to specify IP in IP configuration information.