Networking challenge:

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Networking challenge:

Postby DJ_Izumi » Mon Jan 05, 2004 2:26 pm

I have a problem, well, not so much a problem, just a desire to get more speed.

I am on a cable modem with a PC, no hub or router between the modem and my PC. However, I have a SECOND cable modem, and a second LAN card.

How can I go about connecting both modems to operate in tandum, thusly doubleing my internet speed? >:)
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Postby ErMaC » Mon Jan 05, 2004 2:41 pm

Umm, do you have two completely different cable lines coming into your house, and two cable modem subscriptions? Otherwise you're SOL.
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Postby DJ_Izumi » Mon Jan 05, 2004 2:44 pm

Two different cable modems connected to the same line. (Splitter)

Don't worry, the way the system works in my city is that any number of modems can connect to the same line (So long as the signal remains strong enough. Split the signal enough, it just gets to weak.).

Both modems are subscribed to the service. (Actually, one I got by accident. A year ago, I asked for disconnection, they didn't disconnect me, they didn't reclaim the modem, they just stopped billing me. So I kept using it. :) )

I can get both modems to work simultaniously connected to my computer, but they're operating idependantly. I have to tell my PC which of the LAN connections to use for the internet. I want to get them bridged and working in tandum. :/
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Postby mckeed » Mon Jan 05, 2004 3:23 pm

You need a router, something along these lines:

http://www.guru3d.com/article/network/103/01/

Becuase of the way the IP protocol works, you need a router between you and these connections. Trying to do this from one machine isn't going to work. To do so you would have to really hack the IP protocol.
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Postby madmag9999 » Mon Jan 05, 2004 7:36 pm

hmm im pretty sure if u try to put 2 lan cards in your comp and use both at the same time one will take total control over the otherone. so i dont think u can do it with 2 lan cards. maybe this router thing will work i didnt read the review or anything becouse its 15pages and im lazy but ill ask my friend who is a networker if this can be done and get back to u.
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Postby DJ_Izumi » Mon Jan 05, 2004 7:39 pm

I don't need a router, as long as there's a LAN connection for each one.

I have had both modems connected to the box at once, but WinXP is unable to operate them in tandum, I basicly have to pick which of the two connections it utalizes.

I think if I was using Win2K Server, or Win2K3 I'd be able to overcome this issue easily...
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Postby madmag9999 » Mon Jan 05, 2004 7:42 pm

i tried connecting my 2 comps with 3 lan cards. and i have win2k so i had the modem going in one card and then the other card would be going into the one card in the other comp. but the comp with the 2 lan cards only used one of them. so like i said befor i think its imposible to do it that way but maybe im wrong
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Postby mckeed » Mon Jan 05, 2004 7:48 pm

nope....routing and remote access won't let you do what you want in 2k. I don't know about 2k3. The routing in windows generally isn't very robust. You lose all sorts of abilitities to forward ranges of ports and whatnot. You might not be able to play many games that require a large rannge of ports to be open. I know i did. I did it for awhile in server2k and i know that doesn't work. There is no real good way of doing that in windows at least. The router is designed to do those sorts of things. Plus a server operating system would be real clunky to do any sort of normal computing on.
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Postby klinky » Mon Jan 05, 2004 9:17 pm

You're looking for a multlink/bonded/aggregated ethernet/LAN solution. A cheaper router most likely will not give you this ability. The only *cheap* solution I can think of involves ethernet bonding in linux:

http://www.beowulf.org/software/bonding.html


Keep in mind though, even if you got it working you would not get the maximum bandwidth on a single connection. It's alot like having two CPUs in that, say you could be downloading two files @ 150KB/sec, but you could not get a single file @ 300KB/sec. Because each network interface has their own IP address and the protocol will only send back to a single card. Though you could possibly use a download accelerator to split up a single file, into many connections. Though alot of web admins wouldn't like this. Also p2p programs would probably benefit. The only problem is there isn't enough bandwidth on most of those to swamp a single cable line, much less two lines.

Lotsa hassle, cheap way, setup ifenslave, then ipchains on a linux computer and use it as a NAT device...



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Postby mckeed » Mon Jan 05, 2004 9:22 pm

Which is why i posted a link to a router which would do aggregating of connections :)
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Postby DJ_Izumi » Mon Jan 05, 2004 9:22 pm

Yeah, but certian software can benifit fully from multiple processers, it just has to give each CPU specfic tasks. Like how TMPGEnc will use multiple threads to spread the task around.

SHouldn't there be a solution that would have the modems assigned different chunks data to download?
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Postby mckeed » Mon Jan 05, 2004 9:27 pm

There isn't really a large demand for what you are asking to do, at least not in a consumer market. Even in a professional market, you buy a router when you want to do something like that. This kind of function would be rather cpu intensive to preform based on my knowledge of the IP protocol. Also you have to remember. The computer doesn't see a modem unless its usb. It sees an IP address. The IP protocol isn't really set up to do these kinds of things. You need at least one intermediate between you and the connection for this to work based on how packet switching and how the IP header is composed.
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Postby klinky » Mon Jan 05, 2004 9:33 pm

mckeed wrote:Which is why i posted a link to a router which would do aggregating of connections :)



I dumb, I didn't see your pretty linky...


And yes, like I said you could get a download accelerator... They basically use the HTTP resume feature to start downloading @ multiple points in a file, over multiple connections. This could work, though how well your load-balancing works will come into play. Becuase it might stuff both connections onto one NIC. You'd most likely have to open a bunch and hope that some of them split over to the other NIC.

Also keep in mind that places, such as our very own AnimeMusicVideos.ORG do not like DAs since they hog up HTTP connections/resources on the server. So they block use of them. Which basically means you're stuck using a single connection. Though you might be able to download two videos from the ORG @ the same time, going max speed over each line.

Most P2P software has multi-source downloading. Which uses multiple connections. But most people on p2p networks are limited to 16KB/32KB/64KB upload rates. Also there are long queues on many networks. So even if you had 100 connections going but each was only going 1.2KB/sec. You're not gaining anything really.

It does come down to load-balancing to, because it can be hit and miss. So it might overload one card but the other card won't get used... So.. yeah...

Is it worth it for you to spend $250 on ? Or fiddle with linux. Which actually after reading that page I linked to over again, that might not even work for what you want. So X_X! Bah...
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Postby jbone » Mon Jan 05, 2004 10:54 pm

Izumi, you've missed a major point:

You won't get any extra bandwidth by plugging a second modem into the line.

One modem = 100% available bandwidth

2 modems = 50% available bandwidth each

50% + 50% = 100%
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Postby Alex_Dragon » Tue Jan 06, 2004 12:16 am

jbone wrote:One modem = 100% available bandwidth

2 modems = 50% available bandwidth each

50% + 50% = 100%


Ding! Ding! Ding! We have a winner! He's right you yourself said the signal gets weaker per splitter for the modems.Hence the signal being the same strength if two were connected.
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