sqlplus on linux not connecting when provided with IP port

I am running Oracle Database 11g R2 on Oracle Linux 5.

I am able to connect to my SID from sqlplus if i use the command

sqlplus system/password@orcl

but when i provide the IP port

sqlplus system/password@//10.0.2.15:1521/orcl

i am unable to connect to my local database and i get the following error

ERROR:

ORA-12154: TNS:could not resolve the connect identifier specified

I am able to connect to my database remotely from sql developer so my JDBC driver is able to connect to the database from a remote machine.

My listner.ora looks like this ->

LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 10.0.2.15)(PORT = 1521)) ) ) )

10.0.2.15 is the IP because i am running the linux server on Virtualbox as NAT with port forwarding.

I am sure there is a simple fix but i am afraid i dont have too much knowledge about database.

Thanks, Ben.