Communication of four routers

A software company owns four branches and Internet connection is available at every branch what will be required to build a Virtual Private Network between them and how it will be done.

Questions by Muhammad Ali

Showing Answers 1 - 9 of 9 Answers

The solution is a setting up VLAN at all the four branches which would have all the computers with same requirements on different physical segments.

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  • Sep 4th, 2010

First you have to purchase 4 routers for each branch. then four static ip address through internet service provider & set the ip addresses as per given below

1.  for 1st branch router wan address is (provided by service privider)
     & ip range for internal lan is use a or b c class range. eg. (

2.  for 2nd branch router wan address is   & ip range for internal lan is 
     use a or b c class range. eg(

3.  for 3rd branch router wan address is   & ip range for internal lan is 
     use a or b c class range. eg(

4.  for 4th branch router wan address is   & ip range for internal lan is 
     use a or b c class range. eg(

when one branch communicate to the ip that is not local then request go to router & router transfer the request to the another router where is the destination ip is match.

this is your solution.


  • Apr 5th, 2013

To configure VPN at four locations, the need for hardware is dependent on requirements. once hardware is selected, static ips may not be needed if three of the four locations are talking back only to headquarters, though any business grade ISP should offer static ips. you also have to determine the type of VPN and the access that is to be granted.

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Getachew Aynalem

  • Nov 21st, 2013

You need to create a GRE tunnel, which would enable you to use routing protocols for your VPNs. That way you can have a redundant tunnel via multiple path. Regular IP-sec tunnel does not help you.

Kartik Bhadeshiya

  • Jun 7th, 2014

if you want full vpn connection bw four router....than it can be done by mGRE tunnel and NHRP (DMVPN).  make one branch as a hub and other client. need to purchase four ip add from isp. can also use routing protocol to advertise you private network for vpn. 

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  • Nov 15th, 2014

You use DMVPN HQ: HUB and all  other branches Arena spokes. Eigrp is the used routing protocol for example for all private networks inside the hub and all spokes

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Muthukannan Palaniappan

  • Jun 7th, 2015

With the help of gateway we can interconnect those four routers and we can make a communication between those four routers.

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  • Nov 9th, 2017

Create a site to site tunnel from the HQ to each branch. Will have to have to configure tunnel on each remote site with match pre-shared keys, encryption, etc.

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  • Nov 28th, 2017

Firstly well be requiring static IPs from ISP for each of the routers from individual branches, then build a GRE tunnel and can use Ipsec:Crypto for encryption purposes. thus building a secured tunnel i.e. Private communication over public infrastructure.

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