Looking for ADSL modem that doesn't hang

Discussion in 'Other Linksys Equipment' started by MrVideo, Jan 24, 2007.

  1. MrVideo

    MrVideo LI Guru Member

    I'm potentially looking at a Linksys ADSL modem to replace the piece of crap ActionTEC that my ISP provided with the DSL upgrade.

    Here is the problem: I run a web server and all of the traffic will ultimately result in the modem refusing to accept new incoming connections or allow outgoing connections from within the LAN. Even pings to the router are left unanswered. Attempting to web page in to the router fails as well. But the modem isn't completely dead. Any currently active connections are not lost, nor do they lose any speed. I verified that from work today, in that the telnet connect that I established with my Linux server in the morning was running without a hitch all day. Late in the day I did a ping to the router and nothing. I knew something was wrong when my mailbox wasn't getting any new e-mail.

    The only cure is to power cycle the damn thing and it needs to happen about twice a day: right before I go to work and around the time I get home from work.

    Needless to say, this crap makes accessing my web site a little tough.

    Is there an ADSL modem out there that won't fall over with lots of network traffic? Even if it is a modem with third-party software/firmware to fix this very type of problem?

    What I would really prefer is an ADSL modem that had no router/NAT facilities at all, i.e., a modem that just bridges between the ISP's DSL and my computer, where the Linux box contains the static IP assigned by the ISP, just like the old 768/640 simple modem that was replaced. My Linux server does all of the firewalling and NAT functions for the internal LAN (two network cards in the server). But that was all taken away with the higher speed (4672/832) with this thing that can't handle the business account load.

    From what I can determine, those simple days are long gone. But if my current Linux box (500 MHz/128 MB, soon to be replaced with a faster box) can handle the network load, a simple ADSL modem sure a hell should.

    Any pointers as to what to replace this ActionTEC with will be greatly appreciated.
  2. MrVideo

    MrVideo LI Guru Member

    Additional query.

    The ADSL modems have the ability to be placed into transparent bridged mode. But, with the ActionTEC that didn't appear to work. I have a static IP. Can that be made to work with my Linux box?
  3. mstombs

    mstombs Network Guru Member

    Well I was hoping that the 'opensource' Linksys ADSL2MUE would be hackable to do this, but its beyond me, and it seems that Linksys haven't released buildable source-code so cunning 3rd parties can fix it for them.

    In the UK I have seen that Netgear now have a fairly cheap plain simple ADSL2+ Ethernet modem, specifically marketted as without NAT and firewalls, and with half bridge modes if that's what you want. A number of other modem/routers can be configured in this mode - but as it disables 80% of the firmware functionality - how much attention does this bit get?


    I haven't seen any reviews - but Netgear at least have correctly identified a market need!

    This also happens to be opensource (Broadcom chipset) but I bet the Linux hackers will be more interested in adding back the routing functionality that has been left out!
  4. MrVideo

    MrVideo LI Guru Member

    Thanks for the info. That modem isn't available in North America, yet the modem info is on the Netgear web site.

    I looked at the manual and it appears not to support what I need. Hard to tell for sure from the manual. From what I can determine, no one appears to support a static IP configured modem. Once you go into bridge mode, with the full modem/router units, you have to do PPPoE/PPPoA. I believe that is what kept me from using the transparent bridging mode. When put into that mode, the computer is expected to do the PPPoE/PPPoA handshaking. While I can get the Linux box to do that, that is not how the DSLAM is set up to communicate my static IP. I think that is done via the RFC1483 encapsulation. No idea what that is.

    It appears that this modem doesn't support static IP bridging either.

    I'm a-lookin'
  5. mstombs

    mstombs Network Guru Member

    I don't know much about DSL technology, but one thing I have learnt recently is that only the modem can do PPPOA, you cannot full bridge it and let the computer do it - as you can with PPPOE.

    I have seen reference to ISPs that give out a block of say 5 static IPs using ADSL. You can given one to the modem, 4 to connected machines and connect other's by NAT routing. But the instructions are generally ISP/modem specific.
  6. rizsher

    rizsher Network Guru Member

    Another UK Modem vendor is ADSLNation.com. They're so UK specific that you probably won't be able to find their modem anywhere besides the UK, not even Europe. But, the X-Modem does exactly what you're looking for. Transparent IP bridging, takes the public IP from the ISP and passes it to any interface connected to the modem.... WAN of a router, Network card in a pc. Another modem that I've used in the past is the Zoom X3. It has a half bridge option that does a similar job.
  7. ka9yhd

    ka9yhd LI Guru Member

    I just replaced my 6 year old Effcient networks Speedstream 5260 ADSL modem with a Zoom ADSL 2/2+ Bridge Modem model #5615-02-00F.
    I was having random disconnects with the Speedstream modem. The Linksys router, WRT54GL, could not get an IP address. When I contacted my ISP, one of their techs got back to me on a forum and posted this.

    And another tech suggested try replacing the modem which should improve the margins.

    When I replaced the ADSL modem the margins went up.

    I found the Zoom ADSL + bridge modem at Amazon.com
  8. MrVideo

    MrVideo LI Guru Member

    This looks very promising indeed. Thank you for the tip. The user manual even discusses Linux :)

    The VCI/VPI I can get from my current modem (35/0). I can then plug those into this modem.

    Thanks again.
  9. SideshowBob

    SideshowBob Network Guru Member

    I like to say that the Linksys AM200 / AM300 can work also in Half-Bridge mode and it works just fine!

    It doesn't lockup ;-)
  10. hjf288

    hjf288 LI Guru Member

    Those are some high margins?

    DSL Connection

    Uptime: 20 days, 11:18:13
    Data Transferred (Sent/Received) [GB/GB]: 4.07 / 120.62
    Output Power (Up/Down) [dBm]: 13.0 / 18.5
    Line Attenuation (Up/Down) [dB]: 8.5 / 19.5
    SN Margin (Up/Down) [dB]: 3.0 / 3.5
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