I've been struggling to find the cause of a serious network slowdown at home for a fair few days now. Lots of red herrings, thinking I'd found the cause, and even a few calls to Virgin Media, but I think I've found the cause, and it's Ubuntu!
For the last week or so I've been experiencing pings of around 1500ms - 2200ms. I thought this might have been modem or router related, so I rebooted both and the problem does indeed disappear. However it comes back within 5-10 minutes.
I then tried running a different router, swapping out the DD-WRT flashed DIR-615 for my Cisco 2651XM from my CCNP lab. The problem came back again within 5-10 minutes.
I've called Virgin and had them check if my UBR was reporting any problems, and no. The modem is sometimes kicking up an over power threshold, but only by 1% or so. They are replacing that this week, but it's not the modem I'm 100% sure of that.
I never assumed it was my Macbook running Ubuntu, as I've tried pinging from a myriad of other machines around the house and the result was the same, however it only dawned on me today that the constant throughout the whole problem what that the Macbook was connected to the WiFi!
The second I disconnect the macbook, the connection comes back to its typical sub 20ms ping, plug it back in and a few minutes later we are back at 1500+
I've rebooted the Macbook into both OS X and Win7 and neither cause the issue, so it MUST be ubuntu, but my question is why? and how do I troubleshoot this?
I'm no Linux expert by a long shot, but I've run wireshark sniffing on the LAN from another box and can't see anything amiss, so I'm thinking it must be the TCP stack on Ubuntu itself (or some other software on ubuntu)?
Any help appreciated!
For the last week or so I've been experiencing pings of around 1500ms - 2200ms. I thought this might have been modem or router related, so I rebooted both and the problem does indeed disappear. However it comes back within 5-10 minutes.
I then tried running a different router, swapping out the DD-WRT flashed DIR-615 for my Cisco 2651XM from my CCNP lab. The problem came back again within 5-10 minutes.
I've called Virgin and had them check if my UBR was reporting any problems, and no. The modem is sometimes kicking up an over power threshold, but only by 1% or so. They are replacing that this week, but it's not the modem I'm 100% sure of that.
I never assumed it was my Macbook running Ubuntu, as I've tried pinging from a myriad of other machines around the house and the result was the same, however it only dawned on me today that the constant throughout the whole problem what that the Macbook was connected to the WiFi!
The second I disconnect the macbook, the connection comes back to its typical sub 20ms ping, plug it back in and a few minutes later we are back at 1500+
I've rebooted the Macbook into both OS X and Win7 and neither cause the issue, so it MUST be ubuntu, but my question is why? and how do I troubleshoot this?
I'm no Linux expert by a long shot, but I've run wireshark sniffing on the LAN from another box and can't see anything amiss, so I'm thinking it must be the TCP stack on Ubuntu itself (or some other software on ubuntu)?
Any help appreciated!
....lol