Linksys RT31P2 - phone & 360 connects but no internet

By detrunks
Aug 21, 2007
  1. Hello all,

    I'm having intermittent problems with my router.
    My set up is: 360 connected to router; vonage phone connected to router, access point connected to router through which I access internet via PC. The router is connected to cable modem.

    For some reason, sometimes I will be able to connect to internet but not to Xbox Live, and sometimes I'll get Live but lose my internet. I've been running the same system for about a year with no problems up until the last 2 weeks. Whenever one of them goes down, I CANNOT access the router's set up page. (So, for example, I can access the internet, but not the router page)

    When everything works, I can access the router set up page.

    Can anyone give me some advice please?

    Thnkas in advance
  2. majorblenks

    majorblenks TS Rookie Posts: 29


    I've very recently been having similar problems where by my internet for some reason wont pick up - after a while itll bother to look for an IP address and sometimes fail. I've got a BThome Hub to where everything (including the wireless 360) connects to. I've not checked the XBox since this problem though - ill see if that is affected by my hardware change.

    I've only got these problems since i added my old DVD-Rom drive. Have you added any new hardware or made any configuration changes recently prior to your problem - it may be a conflict somewhere...
  3. detrunks

    detrunks TS Enthusiast Topic Starter Posts: 153

    no - there's been no harware changes in the last 2 weeks, when the problems started
  4. majorblenks

    majorblenks TS Rookie Posts: 29

    ive still got this no connect problem after doing a system restore - so like you, my has for no reason decided to break itself! :(
  5. jobeard

    jobeard TS Ambassador Posts: 9,145   +597

    If you can't access the router, your system is loosing its IP settings OR
    the router is changing its address.
    this is inconsistent with the routing that is necessary to make
    both of them work.
    The data flows from your system, thru the router to the internet. If you can
    browse the internet, the access to the router must be available.

    when it is working, use ipconfig /all to find the default gateway address.
    write it down.

    when it fails, using ping $gateway to see if you're still connected.

    I would update the router firmware, access point and your your WiFi adaptor
    in the PC.
  6. AlbertLionheart

    AlbertLionheart TechSpot Chancellor Posts: 2,026

    In UK some of the ISPs will mess with the max transmissable unbits (MTUs) - check this in the router set up and if it is set to default or 1400, change it to 1360 and see if this works.
  7. jobeard

    jobeard TS Ambassador Posts: 9,145   +597

    MTU default is usually 1500, but I set mine to 1496 to avoid specific fragmentation issues.
    Most link-level implementations will adjust the packet size to that of the smallest
    mtu in the chain anyway.

    In addition, a frequent firewall rule is to toss all fragmented packets to disable
    security issues during packet reassembly. I know mine is set that way.
  8. majorblenks

    majorblenks TS Rookie Posts: 29

    Sorry for jumping in on your post detrunk!

    Ill set up a new one if you guys will indulge
  9. AlbertLionheart

    AlbertLionheart TechSpot Chancellor Posts: 2,026

    The TalkTalk default is I think 1500, British Telecom who control most of the exchanges as 1476. The last one I fixed I as able to access remotely so set it at 1360 and the fix was instant. I left it at that on the basis that I was not going to go on fixing it!
  10. detrunks

    detrunks TS Enthusiast Topic Starter Posts: 153

    thx for the help guys - the fault was something to do with the router's settings which I had to solve via a hard reset. I didn't actually get to the bottom of it, but the hard reset did work.
  11. jobeard

    jobeard TS Ambassador Posts: 9,145   +597

    great! --- please tell us the fix!
  12. detrunks

    detrunks TS Enthusiast Topic Starter Posts: 153

    As I said - I didn't get to the bottom of it. I simply did a hard reset of the router and the access point as well as re-installing the wireless card. It's still a mystery to me why I could access the router set-up page sometimes and not other times. Even more of a mystery as to why I could still access the internet during the off periods. I can only guess that the router's address kept changing, for some reason.
  13. jobeard

    jobeard TS Ambassador Posts: 9,145   +597

    This could be the result of the Release/Renew cycle from the ISP --
    which is why you want all your devices to use DHCP.
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