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Goraz
RealPoor Guru
Joined: 11 Oct 2002
Posts: 3736
Location: Philadelphia
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 Posted: 03/31/05 - 10:34 Post subject: Anyone knowledgeable about Routers / Networking?
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Something was wrong with my 3rd port on my router... whenever I plugged in my ethernet cable, I'd get blinking lights. anyway, I went to linksys site and hit up the knowledge base on how to to fix... I went through these steps and surprisingly, it worked.
| Quote: | When the “Local Area Connection Status” window loads, click the Properties button.
When the “Local Area Connection Properties” window opens, click on the Configure button, then click on the Advanced Tab.
When the “Advanced” area loads click on the Connection Type option under “Properties”. (This may also appear as “Media Type”, “Connection Speed”, “Link Speed”, please try to find the closest match for your system.)
Change option in the “Value” area from “Auto” or “Auto Sense” to the 10Base-t, 10 half duplex mode, 10 no duplex. This may also vary, depending upon the make and model of the Network Adapter.
Click OK after you made the change then click Close.
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Now to my question.... what exactly does this do?
| Quote: | | Change option in the “Value” area from “Auto” or “Auto Sense” to the 10Base-t, 10 half duplex mode, 10 no duplex |
I ask this because my connection seems alot faster, both in browsing and less packet loss between my computer and router... I also have an older firmware version because I play counterstrike and the newest version boots me after 30 seconds on CS.
thanks.
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Callaren
RealPoor Sensei
Joined: 03 Dec 2003
Posts: 1598
Location: South Jersey
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Posted: 03/31/05 - 12:53 Post subject:
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Using Windows XP Pro help:
duplex-
A system capable of transmitting information in both directions over a communications channel.
half-duplex-
A system capable of transmitting information in only one direction at a time over a communications channel.
full-duplex-
A system capable of simultaneously transmitting information in both directions over a communications channel.
Helped?
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Goraz
RealPoor Guru
Joined: 11 Oct 2002
Posts: 3736
Location: Philadelphia
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Posted: 03/31/05 - 13:37 Post subject:
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Yes I understand now what they mean... my next question is though does half duplex result in a faster transmit rate? since information is only being sent one day, less packets are being lost. I'm wondering because I applied my network to half duplex.
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sinrakin
RealPoor Master of Posts
Joined: 11 Oct 2002
Posts: 7044
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Posted: 03/31/05 - 14:10 Post subject:
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Back in the day, ethernet was a shared medium - you had a single ethernet cable (coax) with all the computers connected to it. They couldn't all talk at once because they'd interfere with each other, so you had to use half duplex mode, which meant only one guy could talk at once, and they listened for each other to stop talking.
Then they invented ethernet switches (which became routers when they added in IP functionality as well as just ethernet), and twisted pair ethernet which has a pair of wires for each direction. As long as each port acts like it's own little private 2-station ethernet with the switch on one side and your device on the other you can run in full duplex mode, which means the switch can send data to you while you're sending data to it with no interference. That kind of requires the switch to have internal buffering though, or else if stations on two of the ports are sending to the switch simultaneously, those packets would collide with each other on the single uplink going to your ISP, so you'd have to run in half duplex - there's no collision on the wire going from the switch to you, but there could be collisions on the wire going up to the ISP.
If the switch buffers packets (routers amost always do) then you don't have to worry about that - it just sends a packet on the uplink when it's free and everyone can run in full duplex.
It's not obvious whether they're telling you that you need to force it to half duplex mode, or if they're just saying it can't auto sense the mode and you need to force it to either half or full, just not auto-detect. Half is always safest; it just means that you can't be receiving data at the same time you're transmitting.
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lotek
RealPoor Sensei
Joined: 12 Oct 2002
Posts: 1598
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Posted: 03/31/05 - 14:17 Post subject:
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I still have some coax ethernet cards
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Aviger
RealPoor Sensei
Joined: 11 Oct 2002
Posts: 1509
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Posted: 03/31/05 - 19:27 Post subject:
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It probably means in short terms your router sux, and in full duplex mode (or autosense) you got tons of collisions.
With half duplex you only send / or receive so no more collisions, giving you the "impression" of a faster line.
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gotissues68
RealPoor Sensei
Joined: 21 Aug 2003
Posts: 1866
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Posted: 04/01/05 - 01:50 Post subject:
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As others have said you've removed the opportunity for collisions to occur. Since there's only 1 way transmission occuring on the physical media there isn't a need to retransmit packets that have been lost due to collisions.
When packets are traversing a link if they collide with another packet the collision is detected by either a switch, router or NIC the packet is dropped. The application which requested the packet during the reassembly process realizes that packet 12 of 44 is missing and requests a re-transmit of that packet. If you have lots of retransmissions due to packet loss because of collisions the link is going to appear slow.
Without reading the spec sheet it almost sounds like the router is only capable of 10 Base connectivity. While its not common nowadays with auto-sensing you could connect a 10 base piece of gear to 100 base and of course as it presents as collisions if it works at all... I'd suggest getting a new router capable of 100 base. Now you won't notice the internet itself going faster if you do that, most broadband applications don't run with that much bandwidth *yet* but if you have any sort of LAN you'll enjoy a nice speed improvement..
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