Best Practice to keep Public & Private IP Address

Hi,

What are the best practices to configure Public & Private IP Address on the
same network card with different gateways and dns addresses or if we put two
network cards, what would be the best way for the public and private IP to
co-exist without any problem.
I had problem sometime back when I had two network cards with differnt IPs
(one public and one private). the public ip was hosting a website and the
private ip was for local LAN. sometimes i couldn't access internet but when i
used to disable the private ip network card, everything used to work well,
the same happened vice versa.
another problem was that the event log showed that there is a duplicate name
on the network.
Thanks in advance.
Best Regards,
Inside matrix.

 

If you have a single LAN attached to the Internet you could try not to set
the default gateway in the internal NIC's TCP/IP configuration, so to use
only the public NIC's gateway.

It's quite strange, try to read this KB article:
http://support.microsoft.com/kb/198644/en-us. Anyway you probably don't need
to register the public connection's IP in DNS so you could disable it in the
DNS tab in TCP/IP advanced properties of your public network interface.

Remember that if this multihomed machine is a Domain Controller you have to
make additional configurations to have it work correctly. Internet is full of
articles related to this topic (multihomed domain controller), see also:
http://support.microsoft.com/kb/272294/en-us

Hope it helps.

Regards,

Carlo

 

LAN with internet access requires public IP - internal network access
utilizes private IP. no internet access - no public IP required.