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Public IP Address Issue

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7 replies

by tobrahs

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I just started with a new company last week. My company has 3 locations, all with DSL connections direct to the internet. The DSL router has an IP address of 200.200....., all the workstations have static IPs in the 200s as well. I will be rolling out a Win2K server in the next few weeks utilizing DHCP. Should the addresses be changed to something along the lines of 192.168.....?

7 replies

by cg it

If your using DHCP, then you won't be configuring client IP addresses. So changing them is moot. {In installing DHCP on W2K server, the Wizard(s) are going to ask what range of private IP addresses you want (and will assign them in the LAT}. A default the Wizard uses for DHCP setup in W2K is 10.10.XXX.XXX or 172.XXX.XXX.XXX or 192.168.XXX.XXX. [note: in a dual NIC setup on W2K server, the public IP address for the NIC can not be listed in the LAT]

by cg it

clarification: The public WAN NIC IP address can not be listed in the LAT for connectivity between the WAN and LAN in a dual NIC setup on W2K.

by tobrahs

Perhaps my question was not clear. I have heard there may be an issue with IP addresses of 200.200.XXX.XXX being public IP addresses. What I am after is should the server IP address be changed from 200.200.XXX.XXX to 192.168.XXX.XXX or does it make a difference.

by tobrahs

Is there an issue with having an IP address of 200.200.XXX.XXX on my server?

by timwalsh

Much really depends on the size of the block of public IP addresses that has been assigned to you by your ISP/DSL vendor.

If all your your workstations have IP addresses in the 200.200.x.x subnet, I would suspect that you have been assigned thatsubnet (or a portion of it) by your ISP/DSL vendor. Barring any documentation left behind by your predecessor, your ISP/DSL vendor would be the first place to check.

Assuming these IP addresses do "belong" to you, you need only use this same address range in DHCP. You would NEED to change your internal IP address range ONLY if you discover that you don't "own" the IP range you are using.

Hope this helps.

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