Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[pblink]

I'm pretty baffled by this - I just shelled out some good dough for a DIR655, but when I put it on my network, all the LAN traffic (previously 10/100) started running like garbage, even though I'm running gig connections off the thing...

I did some digging and it sounds like the local LAN ports are all running half duplex!?  Why on earth would you sell a premium router and forget to add that bit of information on the box someplace and bury that information away?  That's a pretty big deal... I ended up throwing my old WRT54G linksys running 10/100 and immediately my xbox media center stuff started being happy again, netflix would stream, etc... 

Is there another model that has full duplex ports?  My god, I wasn't expecting a brand new device with such high praise on throughput to be an absolute nightmare on the LAN...even my non technical wife was like "whats wrong with the internet" and that's from just bouncing around facebook for a few minutes!

Pete

[Techgee]

I thought the same thing at one time due to comments elsewhere that DIR-655 was half duplex.  Turns out it's not true.   

I tested both WAN and LAN ports on my DIR-655 with Intel's NIC PROSet utility - all ports were connected at 1Gb, FULL duplex.

See here for another thread on the same topic.  According to lizzi555, all hardware versions (A1 to A4) of the DIR-655 are full duplex switches at gigabit.

When I first got my DIR-655, there were a couple default settings I disabled immediately since some people have problems with them.  "Enable DNS Relay" (Network setup page) was one of them.   There's probably some setting your LAN/WAN/ISP layout doesn't like.

[lotacus]

I have done extensive tests on the wired ports and came to the conclusion that they do in fact operate at half duplex regardless of settings. Even forcing the network adapter to full duplex yields half duplex speeds.

[pblink]

I found something sort of odd... I was ready to dropkick this thing back to microcenter but what ended up fixing things was using a crossover cable between one of my gig switches that it was uplinked to.  Evidently my old old linksys could handle things properly, but the dlink couldn't autosense an uplink to another switch or something.  When i put a crossover connector in, magically I got fantastic throughput between my xbox system and my vista machine running media center, and all the streaming tests flatlined as high as they could go on the xbox's graph test.  Again, not sure why I needed to get fancy with the cabling, as i've used this sort of config with a linksys uplinked to Belkin and also the Linksys uplinked to a high end procurve, but the dlink to procurve wasn't happy...

So, I think i'm set...although it's not a great feeling knowing your new gear requires this much effort to get tuned to work properly..

[Techgee]

I have done extensive tests on the wired ports and came to the conclusion that they do in fact operate at half duplex regardless of settings. Even forcing the network adapter to full duplex yields half duplex speeds.

Did your throughput tests use network tools that remove disk I/O from the equation - tools like Qcheck and IPerf/JPerf?  Things other than the Switch can affect throughput (Tools used and test configuration, NICs, network cables, PCs, etc.)