what's the best in lan connection

[Matos]

how can i improve it?

there is any programs that can help me to have a better lan?

i red that fragment threshould and RTS improve lan connection. what is the recommended value?

[golfnut]

A better LAN or a better WLAN?

We need more information about why you think you need to improve the network. Is it running slow? Is the connection dropping? Is the coverage bad?

Greg

[Matos]

it's WLAN... and it's running low...

[golfnut]

Again, you haven't provided enough information. Define specifically what running slow means. You could have a fragmented disk drive that could make your computer run slow.

What test are you running that tells you it's running slow? What happens when you plug your computer into the network? What other wireless is in the area and on what channles? What's the layout of your network? Have you upgraded the firmware in your equipment? Is your WLAN secure? How many people are on the network? Do you have Spyware and Virus protection and when's the last time you scanned your computer? Etc. Etc. Etc.

Without details, I personally can't help you. If details are too difficult to provide, perhaps you should have your local computer company take a look at your network.

Greg

[Matos]

at my 1srt post i asked what was the best value for the fragment and it's not about hard drives... it's a network with a router with phisical coonection with a 1srt Pc and another Pc with USB. about the channels, i tried several and got one but it's hard to choose because almost every channel has interference. there is others wireless in the area. what do you mean with layout? Spyware and anti-virus going running and scanning and nothing... didn't upgrade the firmeware. how do i upgrade it?

the problem is the WLAN. it's so slow when transferring a file to another PC...

[golfnut]

Much better information and the problem is a lot clearer. I wasn't trying to be difficult, but it's probably not a good idea to make configuration changes until we know why we need to change them.

So you have a PC that's hardwired to your router. You have another PC with a wireless USB adapter. There's a lot of interference in the area and file transfers are slow.

The distance that the USB adapter is away from your wireless router, omni directional antennas, and interference will obviously slow down the file transfer and I really don't think changing any setting will make this work faster.

I have a suggestion that would be faster but I need to know how far the PC is from the wireless router. Is there a bathroom or kitchen between them or is it on another floor of the house.

Greg

[Matos]

the distance between the PC is not very. is about 15 meters, 20 most, i don't have many things on the way i think. there is a bookshelf with many things and too devices that if turned on can make many interference, can help moving those devices to another place or is the same?

there is only a very small division of 7 meters between my bedroom and the office

[M/Q]

I would like to humbly ask several more questions. What is the actual make and model of the wireless equipment? What are the operating systems of the computers involved. Are there any firewall or security suite applications? Are the two computers on the same workgroup?

You still are being very limiting by not describing everything that is going on? It is not good to make us ask questions or guess as to what is going on. It wastes a lot of time.

Is the problem only occuring when you are transferring from computer to computer? How about when accessing the Internet? 15 to 20 meters can be a problem, it just depends what the signal strength is? Have you tried the file transfer when the computer is closer to the router? What is the signal strength reading on the wireless applications? Better yet get the program NetStumbler and let us know what it advertises as the signal strength.

One last concern is that you mentioned many other wireless networks in the area. What is the channel of the strongest one? You can determine that with NetStumbler if you want. Knowing that channel, try using a channel that is as far away as possible.

As to your first two questions, in some cases fragmentation and controlling RtS and CtS are helpful when there is a great deal of RF interference. This first link describes how to go about checking if you are getting a great deal of collisions and what to try to fix it.

http://www.wi-fiplanet.com/tutorials/article.php/1468331

RTS stands for “Request to Send”. This parameter controls what size data packet the low level RF protocol issues to an RTS packet. The default is 2346.

There are several trade-offs to consider setting this parameter.

Using a small value causes RTS packets to be sent more often, consuming more of the available bandwidth, therefore reducing the apparent throughput of the network packet.

However, the more RTS packets that are sent, the quicker the system can recover from interference or collisions -- as would be the case in a heavily loaded network, or a wireless network with much electromagnetic interference.

Here is another good link about the RtS Threshold.

http://www.wi-fiplanet.com/tutorials/article.php/1445641

Just as a side note you would be well served to check out the tutorials and articles on this forum for information like this.

[Matos]

the answers :

the wireless system is this : router D-Link G604T and a USB D-Link DWL-G122
operating system and firewalls and anti-spyware : Win XP and yes i have firewall ( isn't the windows firewall ) and a spy ware ( scanned with both things and no problems ).

about transferring PC-PC, i red some of yours tutorials and saw that an half of the actual speed of the device is the real speed so i have a 54 Mb and when i use internet or lan, the speed goes down to 24 Mb or less.

the signal strength is too a problem. tryed with the PC's closer, no i didn't.
using netstumbler i get a strength signal between 80 and 90.

right now i don't have any wireless closeby that i can see but yesterday i saw one and
it was on channel and 11 and my was too and now i'am in channel 7.

this channels, they are just good to avoid interference of another wireless or devices?

i gonna test my network based with those tutorials and thanks 4 the response.

[M/Q]

The reason we asked about the firewall and antispyware applications is that they maybe affecting the throughput. You may want to try and disable those. Then test to see if there is any improvement.

As for transfer speed you are correct. It is even worse than that as it appears that you are not getting good signal strength. When you refer to the 80-90 is that the SNR number or Signal+? If it is the Signal+ then you really need to help that improve.

With the USB device you have, there are several things you can do to improve the SNR. I would suggest trying these to get that number better. First step would be to get a USB cable if you do not already and try moving the USB adapter around to see if that improves the SNR. Second look at this link and try some of the antenna projects that they mention. They work very well and I use them all of the time.

http://www.usbwifi.orcon.net.nz/

As for channel selection if you find a strong remote source on channel 11, mover your system to channel 1 or at least 6. That way you are far enough removed to avoid interference.

[Matos]

about the anti virus, it's the same. about the signal and making an antenna, i just didn't saw clear shots of the connection with tools, how and where i connect those tools like a plier?

[M/Q]

I may not understand correctly, but the pliers is just used to help you attach the USB device to the strainer or whatever device you are using as the reflector.

[Matos]

that i understood, but is "how" i connect the USB with the pilers that i didn't understood.

i use 2 pilers, one connecting to the USB and another to the strainer and in the middle i use a wire to connect both pillers ? or i can connect the USB with the strainer without tools in the middle, with both USB and strainer attach?

[golfnut]

Using RTS/CTS on a single node WLAN is pointless and the overhead would further slow the file transfer.

As mentioned earlier, it's useless to make config changes unless there's a clear reason to do so. Guessing at what might be the problem is a waste of time.

Also mentioned earlier, a severely fragmented hard drive will affect the speed of file transfers regardless of the medium.

USB 1.1 ver 2.0 can affect file transfers.

There are too many variables and the story seems to keep changing.

I'm done with this post...

Greg