Computers| Computers |
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08-15-2005, 08:13 AM
| #2 (permalink) |
| Super Techie Join Date: Oct 2003
Posts: 439
|  Usually this is used for servers. In my home network I tried this once and set it up with the first NIC card being used for the external IP address, getting its IP from DHCP. The second NIC is static, and is the card that goes out to your switch, and from there on to the rest of your network. I suppose there're many different configurations you can use but usually it's something similiar to that. The server can do many things with the connection in between. With this setup you can run a proxy, or a firewall, or even anti virus.
__________________ \"I have many layer-eight problems in my life, including myself.\" |
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08-15-2005, 09:47 AM
| #3 (permalink) |
| Ultra Techie Join Date: Nov 2003
Posts: 558
| That's how I've seen it used. Where I used to work, they had their webserver and mailserver setup that way. The public IP's that the world saw were on one NIC, and we could login remotely on the private IP.
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08-15-2005, 09:57 AM
| #4 (permalink) |
| Newb Techie Join Date: Aug 2005
Posts: 10
| Thanks for the response, but please excuse me for being naive. Wouldn't it be possible to connect to the Internet (let's say) with a modem or so, and then have just one NIC installed and connected to the switch (local LAN). All users will then connect via the PC connected to the net? We can install a firewall on the PC connected to the Internet so that we protect the network from being breached. Won't that save cost and extra hardware NIC? |
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08-15-2005, 11:20 AM
| #5 (permalink) |
| Super Techie Join Date: Oct 2003
Posts: 439
| No see you have to understand the network design of this. The modem has to be either connected to a router or to a computer that has a DHCP server on it. If it isn't, then the other computers on the network won't get an IP. Now let's say you have a small business, maybe twenty computers on one network. Of course you could just get a router and maybe add a switch onto that, but that narrows your options. Instead of a router we connect the modem to a server with two NIC's. The server can host anything you want on it. DHCP of course, DNS, an internal fileserver, etc. Also on the server you could install a firewall, one in which you can control completely. You could even install anti virus (but I think you get the idea of the possibilites having a server leads to). If on the other hand you just had a router, sure some have their own firewall but they're not near as good. Also you can't block active x controls, spam or put a proxy over the entire network. Instead you'd have to change each individual computer. Having a server allows you to control your entire network, securely and safely. It's the first thing the internet connects to, making sure that there's no way for a client pc to bypass your security or vice versa.
__________________ \"I have many layer-eight problems in my life, including myself.\" |
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08-15-2005, 02:12 PM
| #6 (permalink) |
| Ultra Techie Join Date: Oct 2003
Posts: 544
| put simply two network cards will allow you to connect to two networks simeltaneously. as Obtruse_Man4 says you can take advantage of this in several ways, one being to chuck a computer in the middle connected to two networks (the internet and your network) effectively acting as a router, so everything from the internet has to pass through this to your network. i have two networks at home, having two NIC's means i can connect to both whilst on the same computer. |
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