how to create dblink between oracle 10G and mysql

I want to create dblink between oracle 10G and mysql

I create it in ECC6.0 using DBCO transaction tcode,which database type can choose?Microsoft sql server?Because there have no mysql item.

I choosed MSS  so that I can test it, but it failed,there is an error that 'ORA-12569:TNS:packet checksun failure'.

I configured the oracle tnsnames.ora file like this:

     CW.WORLD =

           (DESCRIPTION =

                (ADDRESS_LIST =

                      (ADDRESS =

                              (COMMUNITY = SAP,WORLD)

                              (PROTOCOL = TCP)

                              (HOST = XX.XX.XX.XX)

                              (PORT = XXXX)

                       )

               )

               (CONNECT_DATA =

                    (SID = XXX )

               )

               (HS = ok )

          )

When I tnsping CW,it will fail,like this " TNS-12569:TNS:packet checksum failure"

How can I do.