_ (DEST_UNREACH_SENT, "destination unreachable response sent") \
_ (PACKET_TOO_BIG_SENT, "packet too big response sent") \
_ (TTL_EXPIRE_SENT, "hop limit exceeded response sent") \
- _ (PARAM_PROBLEM_SENT, "parameter Pproblem response sent") \
+ _ (PARAM_PROBLEM_SENT, "parameter problem response sent") \
_ (DROP, "error message dropped")