_ (PACKET_TOO_BIG_SENT, "packet too big response sent") \
_ (TTL_EXPIRE_SENT, "hop limit exceeded response sent") \
_ (PARAM_PROBLEM_SENT, "parameter problem response sent") \
_ (PACKET_TOO_BIG_SENT, "packet too big response sent") \
_ (TTL_EXPIRE_SENT, "hop limit exceeded response sent") \
_ (PARAM_PROBLEM_SENT, "parameter problem response sent") \