1. Hamachi is the solution.

2. I need to create a gateway at the office so then i can access all the devices in the office. This is better choice rather to use mesh or hub-and-spoke.

3. I’m using Centos Linux as the gateway

4. This is how i’m install hamachi on the Centos :

yum install redhat-lsb

wget https://secure.logmein.com/labs/logmein-hamachi-2.1.0.136-1.i486.rpm

rpm -ivh logmein-hamachi-2.1.0.136-1.i486.rpm

/etc/init.d/logmein-hamachi start

hamachi login

hamachi attach your-email@email.com

hamachi set-nick “you-gw-name”  <— optional

5. Logon to https://secure.logmein.com/central/Central.aspx

6. On the left menu – go to Networks –> My Networks – At the top of page you will see join pending request as image below :

7. Accept the request

8. Now we create the Network by click on Add Network

9. Fill in network name, network description and select Network type : Gateway

10. Fill in the option for network request, network password, and subscription.

11. Select the gateway – This is where you select the linux gateway you setup just now.

12. Then select the clients/members to join on this network

13. Next you need to setup DHCPD server on your gateway.

14. On ifconfig -a you will see new interfaces such as ham-br0, ham0 and ham1. Your current IP address on eth0 will be on ham-br0. Thus you need to setup DHCPD on ham-br0

15. I’ll not show, how to setup DHCPD.

16. Forwarding the packets :

vi /etc/sysctl.conf

set to :

net.ipv4.conf.default.forwarding=1

then restart the network

17. Enable IP masquerading

iptables -t nat -A POSTROUTING -o ham-br0 -j MASQUERADE

service iptables save

service iptables restart

chkconfig iptables on

18. Launch hamachi on the client, then it should working now 🙂