Slow network between 2 VMS

[nick2016]

Virtualbox one VM to other VM networking is slow. just to connect using sql it takes 1 min approx. Can any one advise... thanks
=>VM1
SQL> set time on
06:52:35 SQL> conn apps/apps
Connected.
06:53:18 SQL>

[applmgr@apps appl]$ uname -r
2.6.32-400.37.11.el5uek

[applmgr@apps appl]$ uname -a
Linux apps.localdomain 2.6.32-400.37.11.el5uek #1 SMP Thu Aug 13 12:08:13 PDT 2015 x86_64 x86_64 x86_64 GNU/Linux

=>VM2 ( Oracle database installed)

Host :Windows 7 64bit, 24GB RAM

[nick2016]

Found Solution myself after spending around a week....

1. upgraded linux kernel .. No Luck

2. played around network adapters of host & guest .. No Luck

3. Removed DNS(internet) from guest VMs.... Solved.

Now, sqlplus takes 1sec to connect. (down from 2 minutes).

Thanks