Crack

Ok, here goes...

I have DSL, that comes in through a DLS modem. It is going into a 5 port switch, then out to two computers that connect fine. I run a line from that switch into a router, setup with DHCP that I want to connect 2 more computers to. That router hands out IP addresses to the 2 new computers, and takes it's own IP address from the DSL modem. I can only get one of the two new computers to connect at a time. It seems like when one of the two new computers gets it's IP address from the router (set up to give out 192.168.0.65-253) it does not connect to the internet, but when I have the router acting like a hub, the the computers connect through it to the Modem, they connect to the internet just fine. Is there a setting in the Linksys Etherfast/DSL router that I need to set to make the router talk to the modem, and have the connection shared out to the computers? If ya need any more specifics, let me know.

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bendsley

Are the IP addresses that your computers are pulling directly from the DSL modem world routable or invalid IPs?

Also, why are you not wanting all of your computers behind the router? I guess by this, your DSL modem is NATing?

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Crack

I am under the impression that both comuters cannot share the same (good) IP address that the DSL modem provided, so that's why I went with the router for the 2 new computers, to provide connection sharing for only them.

The next thing I tried is; I have a hub, so I connected the DSL line to my computer alone, and set up the network so that it works, and it works fine, i'm connected right now, but when I try to use my second on-board nic to provide internet connection sharing to the second computer, it doesn't work, plus my internet connection on this computer goes down as well, as soon as I plug my second nic into the hub... WTF is up with that!

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skaven

Whoah. Sounds like you've got your network all confused. Most cable/DSL providers give you 1-2 IP addresses straight through the modem. If you've got a router, I HIGHLY recommend that you use it to firewall off your other computers. Here's how you should wire it up:

[DSL]--[DSL modem]--[WAN port on router | LAN port(s) on router]--[your computers/hub/switches]

Not a very good graphic, but hopefully you get the idea. The router, by definition, is designed to "bridge" two networks. In this case, you want to bridge your home network to the DSL network, so you plug your DSL into the WAN port, and your home network into the LAN port(s). By doing that, all the computers on your LAN should get IP addresses from the DHCP server in the router (192.168.x.x), and the router will use NAT to let your systems online. As an added bonus for this configuration, this "hides" your LAN from the rest of the internet, effectively firewalling yourself without the need for funky security software. Also, any traffic coming from your LAN to the Internet appears to come from one computer (from the ISP's standpoint), so if your DSL contract has some kind of "per-system" pricing, you can cut it down to one "system" and run as many computers as you like. The ISP will be none the wiser.

Hope this helps.

zero2

I think you have the setup wrong, skaven's idea sounds right.

DSL modem connects to Router, Router connects to Switch, Computers connect to Switch.

The other way of setting it up is by getting rid of switch, so it would look like this:
DSL modem connects to Router, and Computers connect to Router. Providing that the router has enough ports.

Bamrak

I agree, your switch is overcomplicating the network with unneeded segments. Your router should have at least two ports, so I would drop the switch and run the router between the pcs and the dsl modem.

Cryptic

depending on number of ports, just skip all that crap because obviously it's not working and go DSL modem to router and then computer to router.

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Crack

But I need the switch to connect the two computers downstairs (a busniess) to the DSL modem, but I also want to connect the two computers upstairs (home) to the existing DSL... Maybe it cannot be done..

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Lasereth

What's the problem? I guess we're missing the point of your problem. Couldn't you simply connect the phone line to the DSL modem, the modem to the router, the router to the switch, and all four computers to the switch? This would eliminate any networking problems you have since DHCP would be taking care of everything.

Is there a physical problem? Like cable running or something?

-Lasereth

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Crack

yes, cable running is one problem, but not a major one... I just don't understand why one computer will work upstairs, but I try to connect 2 computers via ICS, and Both lose connectivity..

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guthmund

I am confused right out of my socks.

I don't know why the ICS connection quit like that. Of course, I don't really understand how the thing was hooked up. Where was the hub, you mentioned? What was plugged into that? How many "real" IP addresses do you get from your service provider?

Sometimes it's better not to ask the questions that confuse, but rather find the solution that works. Pretty Confucian, wouldn't you say?

How about sometimes you have to destroy the village to save the village?

Here's what I suggest.

The router and the switch need to change places. I'd try that first. Put the router downstairs? next to the DSL modem and put the switch upstairs? on the home PCs.

Maybe you'll get lucky and everything will be 5x5 indicating all is well. If all the connection lights (on the router,switch and PCs) are all on then okay. Just configure the PCs and everything should work fine. If certain connection lights aren't coming on then you could then just pull that individual cable. If no connection lights come. No harm, no foul. It had to be done. Start from scratch, pull all the cables and salvage what you can.

It's my understanding and with concern for your particular situation that the router needs to be as close to the router as possible. Meaning they should be physically connected with nothing in between.

Maybe, my brain's just fried for the night and a new day will bring new understanding....or something.

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Silvanio

Read what guthmond has to say. My suggestion lies in there.

It sounds like you're getting youself a little hung up on how the computers are laid out physically. Just connect DSL > Router > Internal Network (4 computers and a switch configured any way you want)

deapfreeze

I am going to have to agree with Lasereth. connect the phone line to the DSL modem, the modem to the router, the router to the switch, and all four computers to the switch? This would eliminate any networking problems you have since DHCP would be taking care of everything.

Run the cable and everything should work fine.

soopafreek

and piggybacking on to what everyone's suggested (which i agree with), try making sure you "ipconfig /release" on the computers that just aren't able to connect.... maybe they're stuck with DHCP assigned IP's that are already spoken for?

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bal8664

I dont see the need for the switch or hub at all, assuming theres 4 ports on the router, which most have. At my house i have a dsl conenction and 4 pc's conencted to it, this is how i do it. Modem -> Router -> 4 pc's. Each PC has a local IP like 192.168.0.2, router gets the ISP's IP, and best of all, XP uses this setup as default so absolutly no configuration is needed, just plug and play.

hrdwareguy

Although others have reccommend you change your configuration, you should not need to. Your computers should run fine in the confiuration you have them. In the router, there should be a section where you can put in the default gateway and the DNS server info. Make sure this information is correct. If you don't have the default gateway set up, the 2 new computers won't know where to go to access the internet.

Go to one of the old computers that is connected directly to the switch, from a DOS prmopt type winipcfg (Windows 9x/me, you will need to click the more info button) or ipconfig /all (windows nt, 2000, xp). Write down the default gateway and the DNS Servers. Go to one of the computers that is not working and run the appropriate ipconfig utility. Check the default gateway and DNS servers to see if they are the same. If not you will need to set this up in the router. If they are, let us know and we can go from there.

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7w17ch

could you also give a little more information such as the type/model # of router you are using and the same for the switch?

I must concur with the majority of the posters that you should re-order your network. coming from the dsl, you should have the router as the first device. not only so that you can benifit from the DHCP, but so that you can place everything behind the firewall i hope is also on your router.

on a side note if you are savvy enough i reccomend you do not use a "out of the box" router, but to build one and run a linux distro of your choosing as a firewall. bbi agent is a very lightweight distro with a web client. going somewhat larger are both clarkconnect and smoothwall. as for myself i am using fedora core 2 (i know i need to upgrade) with a homebrew firewall. if you have any questions on how to build a router, ask me, I am very willing to help.