This is easy. find my.cnf file (location depends on your OS ). open it and make following entry:
bind-address = 172.20.17.30
Now you can access mysql server from anywhere using following command:
mysql -u username -h 172.20.17.30 -p(ur_password)
If it doesn't work check the following:
Port 3306 is open in Windows Firewall (in case of windows) or iptables (in case of linux)
Are you able to ping 172.20.17.30 from remote PC?