TCP / IP Networking Configuration
Posted on 2011-05-10
Wanting to check my sanity before I go ahead and change the internal IP scheme for a new customer site from the existing 10.0.0.x class A mask to something completely different. Reasoning behind the change is about 5 different companies are coming together to put together a bid for a job and the various companies have various IT requirements. For the vast majority of the computers, they all work perfectly, but there are 3 French laptops that need VPN access to be able to receive their emails and when they are connected to the 10.0.0.x LAN and VPN - they can't get their emails.
Having spent some time working out what the problem was - initially thought it was an IP conflict of ranges - it turns out to be an IP conflict of ranges!
So - the task here is to work out a Safe internal network IP scheme that I can use to keep the world happy.
So, the IP ranges in use are as follows:
LAN currently configured as 10.0.0.x Class A
3 French Laptops using VPN connecting to 192.168.6.x IP Range with Class C Subnet Mask using DNS server of 10.27.200.98 & 10.27.200.99 (currently working happily)
1 French Laptops using VPN connecting to 192.168.188.x IP Range with Subnet Mask of 255.255.255.252 using DNS server of 10.23.251.171 & 10.102.16.30 (not able to VPN and get mail)
1 French Laptops using VPN connecting to 192.168.190.x IP Range with Subnet Mask of 255.255.255.252 using DNS server of 10.23.251.171 & 10.102.16.30 (not able to VPN and get mail)
3 French Laptops using VPN connecting to 192.168.0.x IP Range with Subnet Mask of 255.255.255.252 using DNS server of 10.23.251.171 & 10.102.16.30 (not able to VPN and get mail)
Remote Office IP internal IP range is 172.17.80.x Class C Subnet Mask
1. Local connectivity to LAN to access IP based printers and a server to save / store documents on and access the internet.
2. VPN requirements for the French laptop users to be able to connect to their remote networks, use their email and also still print, save documents locally to the server and surf the web.
3. Gateway to Gateway VPN to be setup to another office located in the same country and access to that server for the relevant members of staff.
So - what would the 'best' internal IP Range / Subnet Mask be to cater for the above requirements and keep everything working and everyone happy?
Hope that's all clear and everything covered.
I need to go back this Friday PM to change the internal network IP range, so looking for good Experts with IP skills way better than mine!