Help Please For Create Database Link

I have 2 databases in the same machine.

Database 1 : db1 (ORACLE_SID)
 with an user u1

Database 2 : db2 (ORACLE_SID)
with an user u2

I would like to use u2's objects in db2  when I'm connecting u1 in db1.

So, I create a database link by connecting with u1 with the following command :

    CREATE DATABASE LINK u_link CONNECT TO U2 IDENTIFIED TIGER     USING 'T:175.123.25.1:db2';

Then, in SQLPLUS, I type the following command :

    select * from u2.EMP_at_u_link;

And I have an error "ORA 06401 : NETCMN: invalid driver designator"

Can anyone help me please ?

Thank.

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