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WRT54G and Gigabit LAN

Discussion in 'Cisco/Linksys Wireless Routers' started by jgkurz, Dec 2, 2007.

  1. jgkurz

    jgkurz LI Guru Member

    Hi Folks,

    I have a WRT54G v4 with DD-WRT v23 SP2. I have been very happy with the router. My WAN and LAN work flawlessly. I recently upgraded my internal LAN to gigabit NIC's and installed a Linksys EG008W 1000mb switch with an uplink from the WRT54G for WAN connection. All PC's receive DHCP IP addresses from the WRT54G and are connected via Cat5e cables. All LAN PC links show connected at 1Gb speed.

    My intention was to get gigabit transfer speed between the internal LAN PC's. I thought that even though each PC was getting DHCP from the WRT54G 100Mb router that the LAN transfer speed would be at 1Gb through the new Linksys gigabit switch. What's happening is the transfer speed is identical whether I have the Gigabit capable PC's connected to the WRT54G at 100Mb or through the EG008W switch at 1Gb.

    Is my WRT54G keeping the LAN transfer speed to 100Mb even though the LAN is linked at 1Gb using the gigabit switch?

    Is there anything I can do to maintain internet access though the WRT54G and still have gigabit speeds on my internal LAN?

    Thank you,
  2. albiemanmike

    albiemanmike Network Guru Member

    Not sure why you are having issues with Gigabit across the LAN. I have one of my clients setup with all HP Proserve Gigabit switches which connect to Sonicwall 10/100 routers and all LAN transfers are at 1 gb. You should have all of the LAN workstations connected directly to the gig switch and the gig switch connected to one of the lan ports of the 54G. this should enable you to get 1 gb. speed across your lan without issue.
  3. HennieM

    HennieM Network Guru Member

    You should get Gb speed PC--1000MbpsSwitch---PC
    Remember though, that Gb speed is usually only about 2x (or less) 100Mb speed.

    Also, are you sure there are no other bottlenecks in your transfer, such as slow disks, not a lot of RAM, etc. in the PCs?

    FYI, I have also found, I think on Win200x SP3, that the Gb drivers for some NICs are actually slower than their 100Mb counterparts.

    You can perhaps test by, after 2 Gb PCs have IPs, plugging out the WRT from the Gb switch, and then testing the xfer speed.
    Alternatively, set static IPs on the 2 PCs, plug out the WRT, and power cycle the PCs and the Gb switch, and then test xfer speed. (This way the WRT cannot have any influence).
  4. frenchy2k1

    frenchy2k1 LI Guru Member

    or even try with a cross over cable from PC to PC.
    Gb network need to have fast host machine to work. Some OS also have problems with it. For example, Win Vista will limit your network speed if you are playing any media file (to 100Mbps speed. They may have patched it now, though...). You may also need to play with each network card setting, including jumbo frames.
  5. jgkurz

    jgkurz LI Guru Member

    Thanks everyone for your replies. I've tried everything except a cross-over cable. I even went to cat-6 cabling and my transfer speeds have never exceeded 18,000Kb/sec. All links show full 1Gb. I've even installed a couple programs that check transfer speed by adjusting the block sizes of the files being transfered. I never expected speeds close to a true 1Gb but I definitely thought I'd get an improvement over the previous 100Mb network. I was hoping for at least 50,000Kb/sec. I have a feeling my transfer speeds may by limited by the CPU and memory on one or both ends of the transfer. So far I haven't tried a transfer between two robust systems, just laptops and slower desktops.

    I'd enjoy hearing about other people who have 1Gb home network and the speeds they achieve.
  6. teststrips

    teststrips LI Guru Member

  7. frenchy2k1

    frenchy2k1 LI Guru Member

    18kb/s? This is NOT normal.
    even 50kb/s is unheard of.
    I get a 1Mb/s on a wireless 54G and I would get several Mb/s on a 100Mbps line.
    You DO have a problem somewhere in your setup and a huge one.
    How do you measure the traffic between your computers?
  8. jgkurz

    jgkurz LI Guru Member

    Hi Folks. I need to apologize. My email above was missing several zero's when I stated my current throughput. I have edited my post #5 to show the accurate kb/sec. :redface:

    I changed the Windows settings recommended at http://www.enterpriseitplanet.com/ne...le.php/3497796 but so far I get the same results. MTU is at 1500 on all systems. Here's a screen capture of a 44MB zip file I transfered from my laptop to my desktop. Again, I have verified that all links are at 1Gb. This transfer speed is what I get no matter what PC's on my LAN do the transfers. :frown: I got this transfer speed with my 100Mb network as well.


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