Re: 2 DNS, one machine

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Hello Bruce,
I think you need two DNS *ADDRESSES*, not two DNS *SERVERS*. I have a DNS server set up on my internal network, but my ISP would get very irritable with me if I attempted to put a DNS server on the external interface. :-)
If you are setting up a home network, and the linux server won't be your firewall (it can't, if it doesn't have two network ports), then I'd recommend going to the local Walmart or Best Buy and grabbing a $30 hardware firewall/router. Hook up your cable modem or DSL to the external port, then hook up your linux server and other computers to the internal ports. Default config on most hardware firewalls is Ok. Not perfect, but Ok. Usually they are set up as stafefull firewalls, so they don't allow ANY incoming traffic unless a computer on the inside has requested it. Most are also set up to provide DHCP addresses to any computers on the internal network.
Once this is hooked up, both your computers are protected by the firewall, they can both reach the internet, and they can talk to each other. Most people use 192.168.0.x or 192.168.1.x for the internal network.
Alternatively, if you have multiple network ports, you can set up a separate DNS server for every local subnet, reserving one port for the internet connection of course, then set up a NAT (network address translation) firewall with iptables. :-)


At 06:49 PM 11/28/2004, you wrote:

Is it possible (pratical) to run 2 domain name servers on one linux box (with one processor)?

I'm installing FC2 to be a server for small home network but I would like to connect to the internet occasionally for updates and such and I need to assign an IP address now while installing. RFC 1597 suggests two DNS as a solution for this situation.

Do I only need to use one of the addresses assigned for private networks in RFC 1597? It wasn't clear to me when I read the spec if these addresses are reserved globally for private networks or if DNSs connected to the internet always need an assigned IP address.


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