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I have a problem. I need to plug two RJ45 into 1 PC with 1 RJ45 plug so my question is. Is this possible to make form 2 cables one?

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closed as not a real question by Canadian Luke, Nifle, 8088, wizlog, Tog Mar 1 '13 at 19:36

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

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How many ports does your computer have? This question reads like an XY problem. –  Dave Rook Mar 1 '13 at 12:47
    
just one is working –  Bartosz Mar 1 '13 at 12:55
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And are you ok to explain why you want this? Some times it's easier to answer when we know the problem instead of working on a solution (hence my link to the XY problem (which is not meant to be read as rude :) ) –  Dave Rook Mar 1 '13 at 12:59
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Remember, the speed is limited by the other side of the box, so if ISP provide 2mb and you get 2mb, then it won't get faster. If you're having a slow connection then that is a separate question (And the actual question)! –  Dave Rook Mar 1 '13 at 13:23
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The simple solution would be to assign the mac address to a router. –  Ramhound Mar 1 '13 at 13:25
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2 Answers 2

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2 cables wired together and plugged into the same jack would garble any message coming into the ethernet port, like 2 people talking to you, 1 in each ear. A solution might be to buy an ethernet hub, connect the PC to it, and connect both cables into the hub. Then, the hub could control the messages coming in from both cables. Hubs are inexpensive will serve the purpose you want.

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You can't "convert" or "merge" two Ethernet cables into one, but you can combine them using something called link aggregation:

Link aggregation is a computer networking term to describe various methods of combining (aggregating) multiple network connections in parallel to increase throughput beyond what a single connection could sustain

For link aggregation to work you definitely need two Ethernet connectors. Since you only have one you can use a ExpressCard/PCMCIA Ethernet adapter if your computer includes such an extension slot.

If you manage to get two Ethernet connectors working you can configure link aggregation like this:

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