72                           Ipv4Mask networkMask, 

    72                           Ipv4Mask networkMask, 

    73                           uint32_t interface);

    73                           uint32_t interface);

    74   void SetDefaultRoute (Ipv4Address nextHop, 

    74   void SetDefaultRoute (Ipv4Address nextHop, 

    75                         uint32_t interface);

    75                         uint32_t interface);

    76   uint32_t GetNRoutes (void);

    76   uint32_t GetNRoutes (void);

    77   Ipv4Route *GetRoute (uint32_t i);

    78   Ipv4Route *GetRoute (uint32_t i);

    78   void RemoveRoute (uint32_t i);

    79   void RemoveRoute (uint32_t i);

    79 

    80 

    80   void AddMulticastRoute (Ipv4Address origin,

    81   void AddMulticastRoute (Ipv4Address origin,

    81                           Ipv4Address group,

    82                           Ipv4Address group,