IP configuration for an office network

Hello,

We are creating a network for our office and was just wondering which private ip class address range most businesses use (10.0.0.0-, 172.16.0.0-, 192.168.0.0-).

We will be having employees VPN to the server and most of them have their own networks utilizing the 192.168.0.0 addressing scheme.  We want to avoid any conflicts so can we set the default gateway to say 172.18.1.1 if we wanted?

Thanks,
Mike
jumptohighAsked:
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pony10usConnect With a Mentor Commented:
There should not be any conflict as they should be issued an internal address once connected through the VPN.

A common strategy is to use a specific range/network for the users connecting through the VPN.

For example:

Internal network traffic would be 10.0.0.1/24
VPN network traffic would be 10.0.1.1/24

You could use a network mask of 255.255.254.0 to allow for networks 10.0.0.0 through 10.0.1.255
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David KrollCommented:
Use whatever you want.  10.0.1.x seems like a pretty universal business internal IP range.
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helpfinderIT ConsultantCommented:
basically it does not matter which of that provate networks you will choose. if you are affraid your employees home networks will be the same, so possible conflicts are there, then use some non usual like 192.168.12.0/24
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jumptohighAuthor Commented:
Thanks,

If I chose something in the 172 range, what do I put in as the subnet mask?

Mike
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Tony GiangrecoCommented:
To try and eliminate any future conflicts, choose an ip scheme that your employees are not using.

If they all check their IP's at home and report back, you would then have a safe list of schemes to eliminate.
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PerarduaadastraCommented:
This gives a helpful overview of private IP addressing:

http://en.wikipedia.org/wiki/Private_IP_address

From a practical viewpoint, it makes sense to use very different private IP address ranges when setting up the LAN and VPNs as configuration errors are more easily avoided, and more easily spotted if they occur.
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helpfinderIT ConsultantCommented:
if you want 172 range than use e.g. 172.29.1.0 with mask 255.255.255.0 what gives you IP range 172.29.1.1 - 172.29.1.254 if it is OK for your network capacity and hopefully your IP range won´t overlap some of the employee at home
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
avoid using 192.168.x.x as it is non-routable.  This becomes an issue if you decide to have a second office and host your vpn at one office only.  Same for communicating if you will have a WAN.
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