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Force WAN to 100MB Full Duplex

Discussion in 'Tomato Firmware' started by PGalati, May 24, 2013.

  1. PGalati

    PGalati Network Guru Member

    Is it possible to force the WAN port to only use 100MB/Full? Using Shibby 109 ND VPN on a WRT54GL and the ethernet port state is indicating a 100/half connection. I am not sure if the fibre to ethernet handoff can be set by the ISP to 100/Full. If I plug a Mac into the edge port, the port does work on 100MB/Full and 100MB/half, but the router is not connecting at 100/Full. This is limiting the bandwidth available to the router. I would prefer not to put a switch in between the edge port and the router.

  2. RMerlin

    RMerlin Network Guru Member

    Tried replacing the Ethernet cable between the router and the modem?
  3. unoriginal

    unoriginal Serious Server Member

    I think you will find that disabling the Ports State feature on Basic->Network will stop the WAN/eth0 connection from degrading to half duplex. On my Buffalo WHR-HP-G54 I was dropping down to 10M/Half Duplex every few hours.

    You can check the state of the port using mii-tool in the extras bundle. You upload it to the router (I use scp, and put it on /jffs) and run mii-tool eth0 to get the state of the WAN port. mii-tool -r eth0 forces renegotiation.
  4. PGalati

    PGalati Network Guru Member

    I thought I did remember seeing it somewhere, but in the Advanced Miscellaneous screen there is a drop down to attempt to force the WAN port to a specific speed. It does not appear to work on a WRT54Gv4. Permanently auto I am afraid.
  5. Monk E. Boy

    Monk E. Boy Network Guru Member

    It might be configurable via nvram commands, but I've never done it with a WRT54 series. Is the WAN port capable of 100/Full? That might be your limiting factor.

    A WRT54G isn't going to be capable of pushing 100Mb through the router though, at least under Tomato.
  6. PGalati

    PGalati Network Guru Member

    Yes, the WRT54G is capable of 100/Full. The issue is that the port that the WRT's WAN port plugs into is advertising 100/half even though it could do 100/Full. I could not find a way to tell the ISP's edge port to force 100/Full. So the WRT goes 100/half which limits it to about 8Mb. I did put a switch in between the ISP's edge port and the WRT and both then reached 100/Full, which did bring a solid 30Mb which is the limit with Tomato and the WRT54G.
  7. Monk E. Boy

    Monk E. Boy Network Guru Member

    Normally if you force a port to be a particular speed & duplex you need to have both ends of the connection configured. In the case of a PC and a switch that means the port on the switch and the port on the PC should both be manually configured.

    I really hate ISP equipment, and they're getting worse about letting knowledgeable customers in. You may be able to call your ISP and have them remote into their equipment and set it for you. Brighthouse demands people do it that way (though kind install techs will take pity on you and give you the current name/password, but the password changes every so often, and even THAT username/password doesn't give full access).
    koitsu likes this.
  8. RMerlin

    RMerlin Network Guru Member

    Over here, Bell Canada (DSL) provides you with a modem/router from which they removed half of the features, including... bridged mode :( Fortunately, you can just use your own modem if it's ADSL or ADSL2+. Their newer services however uses VDSL2, and you are stuck with their modem.

    Videotron (cable, what I have): they remotely disable the whole web interface in the modem. Not so bad since it's a plain cablemodem, with no routing capability. However being able to view your line stats was one thing that was nice, but is no longer possible once the modem gets provisioned by them :(

    And we aren't even mentioning the dubious quality of most of ISP-provided equipment... Those 2wire modem/routers Bell provides for ADSL2+ are total junk.
  9. Monk E. Boy

    Monk E. Boy Network Guru Member

    What is it about former Bell companies and their affinity for 2wire? Bell Canada and AT&T love 2wire...
  10. RMerlin

    RMerlin Network Guru Member

    They probably just both happen to go for the cheapest junk they can find? :)

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