Musings from Munkimatt

A flow of whatever tickles my fancy

Xbox Live, Belkin Router and MTU issue

I’m wondering if any of you clever sorts have an idea on how to fix the issue below.

I’m having a few issues with my broadband and as a result I’ve switched from my router provided by my supplier Plusnet (a Thompson model) and onto a Belkin F5D8635-4 v1 as part of the process of eliminating the cause of the fault. My problem is that when I use the Belkin router I can no longer connect to Xbox Live.

When it attempts to connnect I’m informed there’s an error and to do a network test. That test then tells me that my MTU is too low and Xbox LIve has a minimum MTU of (off the top of my head) 1364. The problem is that when I go to the router settings and look at the MTU it’s set at (again, off the top of my head) 1432.

I spent last night moving the MTU up and down, from the minimum up to 1500 and found that at no point could I connect to Xbox Live. I plugged my Plusnet router back up and it connected to Xbox Live no problems.

I’ve searched around on the internet to no avail, looked for a new router firmware (couldn’t find one), I’ve placed the Xbox in the DMZ, I’ve forwarded ports, I’ve prayed to Zeus, nothing has worked. Any ideas folks? My evenings don’t seem complete unless I’m being verbally abused by someone who’s doing their GCSEs.


December 17, 2009 - Posted by | Uncategorized | , , , , , , ,


  1. Hi Matt,

    Sorry to hear you’re having problems. What makes you think it’s the router that’s at fault? Would it help if we sent you out a replacement?

    Not sure about the MTU issues although it is something I’ve seen reported before and seems to be all over Google.

    Have you tried contacting Belkin support about a more up to date firmware revision. Looking at some of the Google results suggests that some people have been given pre-release firmware in the past?

    Plusnet Customer Support

    Comment by Bob Pullen | December 18, 2009 | Reply

    • Hi Bob, didn’t expect a reply from you guys here, very impressed!

      To be honest I’m only pointing the finger of suspicion at the router because last month (?) I had the same issue and you guys thought it was the router and sent out a replacement. I’ll be honest, I didn’t spend that much time online to really notice if it was working or not, but when I did go online (2 weeks after getting the new one) my speeds were horrific again.

      Plugging up this Belkin one seems to keep me at a steady high speed, but the downside is/was that I couldn’t get on Xbox Live.

      I’ve just knocked off UPnP, the Xbox is in the DMZ and it logged in to Xbox Live for the first time, so I’ll try some online gaming later on and report back.

      My e-mail is on the front page Bob, if you want to contact me off here please feel free to do so.


      Comment by munkimatt | December 18, 2009 | Reply

      • Let me know how you get on and I’ll be in touch next week if you’re still having problems.


        Comment by Bob Pullen | December 18, 2009

  2. Scrap that, just seen this and it seems all’s well again –

    Comment by Bob Pullen | December 18, 2009 | Reply

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