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[In0va3]

I'm currently using a D-Link DIR 655 A3 FW 1.34
Connected with an 100 ft Cat 6 Ethernet cable

The problem is, both my router and the network adapter are gigabyte Ethernet. But why is my computer showing it's running at 100 Mbps and not 1 Gbps?

I've connected at 1 Gbps before with a shorter Cat 5e cable but it just isn't showing 1 Gbps now.

[JimMonz]

Check your NIC adapter properties
(Device Manager/Network Adpater/Properties/Advanced Tab)

1. Check to see if "Speed" is set to Auto or 100 Mbps. Set to Auto.
2. Update driver from NIC's website (not windows update).

I hope this helps.

[smlunatick]

Longer cables can "degrade" and get slower speeds.

[In0va3]

Check your NIC adapter properties
(Device Manager/Network Adpater/Properties/Advanced Tab)

1. Check to see if "Speed" is set to Auto or 100 Mbps. Set to Auto.
2. Update driver from NIC's website (not windows update).

I hope this helps.

I installed the manufacturer's drivers but they're still the same.

[JimMonz]

What about the Device Manager settings?
Mine was defaulted at a lower level.

[In0va3]

Mine is on auto and when I set it to 1000 Mbps full duplex, the adapter just disables but then turns back on at Auto.

[shaith]

If it worked with the shorter cable, have you tried another long cable (and by long how long are you trying to run?)?

The fact that it works with a short cable kinda indicates one of two things:

1) Your long cable is too long or picking up interference
2) Your long cable is bad

[In0va3]

If it worked with the shorter cable, have you tried another long cable (and by long how long are you trying to run?)?

The fact that it works with a short cable kinda indicates one of two things:

1) Your long cable is too long or picking up interference
2) Your long cable is bad

The long cable is 100 ft and I already nailed it onto the wall and I don't have another long cable. I'm thinking it's because the cable is too long..

[shaith]

Might be the way you nailed the cable to the wall, might be that your cable isn't at least Cat-5 spec.  1000Base-T connections differ from 10 and 100base in that all four pairs are used.  Many cheap cables are wired using 2 pairs instead of all four or the secondary pairs are wired incorrectly resulting in negotiation failure. 

The max length for a 1000Base-T cable is 100 meters - your 100 foot cable is only 1/3 of that distance (roughly), so you're well within acceptable cable length maximums. 

If you nailed through the shielding you're shorting the cable.  If you weren't careful when you nailed, you might not realize that one of the nails is piercing the shroud.  Or, as stated before - you may simply have a bad cable.

[EddieZ]

So remember the credo: Always check and test before you nail....

[dirkpitt]

The long cable is 100 ft and I already nailed it onto the wall and I don't have another long cable. I'm thinking it's because the cable is too long..

Is this a store bought or custom cable?

If custom, you can still add new ends without tossing the whole cable because it is vital to ensure that the twisted pairs are connected properly:  How to wire Ethernet Cables. 

Of course it is always advisable to use store-bought brand name cables for such a long run! 

[In0va3]

This is where I bought it:

http://www.newegg.com/Product/Product.aspx?Item=N82E16812189041

I bought it cause it's cheap, guess there's a trade-off for it's price?

Also, I tried the cable before I nailed it and it was still 100Mbps.

[rekd0514]

Here is and even cheaper source for great quality cables.

http://www.monoprice.com/products/subdepartment.asp?c_id=102&cp_id=10232

[shaith]

Umm...if you tried it before you nailed it and it was 100mbps, why'd you nail it up there? 

[ryan200]

do you need all 100 feet? make the cable shorter.

you might be able to get a gigabit switch and 2 - 50 foot cables if length is your problem, but you don't know for sure till you try.

but i think i had a cable that kept going back to 100mbit and i cut off the end that was kinked and now its back to 1gb, it might just be a bad cable.

you may not need cat 6 you might be able to get away with cat 5e.

your also not supposed to run your wire over power wires or flourscent lights good luck doing that with a 100ft cable.