I use to only think this problem was happening to me, since my ISP is going out of business and someone else is taking over their customers so I was reluctant to do anything, I still can't contact Tech support because of this, however since reading this it might be something deeper.
I've been testing this more the past few days, got some friends on BT Wholesale ADSL to test it from around the country. They're all in the 20ms to 30ms range.
I've reset the router, changed IP, used different OSes, logged in as the BT test user and tested against the one site you have access to - all at a variety of times.
I've pinged and traced the route to my ADSL gateway from my own hosts, from my VPS (8ms) from inside the JANET network (14ms); I know some of the test locations are closer to the core but everything seems to get a faster, better response from my gateway except me and it never use to be like that.
I've noticed also, random disconnects. Nothing too frequent but when they happen it can be anywhere from a couple of minutes to a few hours until I'm back up.
Again if anyone from Thurso or Inverness would like to test and post results I'd welcome them.
Code:
--------------------------
Me to my VPS, Windows host
--------------------------
Tracing route to <my site> <My servers IP>
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms discworld.house.local [192.168.1.1]
2 58 ms 56 ms 58 ms 78-33-35-106.static.enta.net [78.33.35.106]
3 59 ms 57 ms 58 ms gi8-20.212.mpd01.lon02.atlas.cogentco.com [149.6.148.105]
4 58 ms 56 ms 57 ms te4-2.mpd02.lon01.atlas.cogentco.com [130.117.1.17]
5 66 ms 65 ms 63 ms te2-1.ccr01.man01.atlas.cogentco.com [130.117.3.166]
6 62 ms 61 ms 63 ms 149.6.11.38
7 65 ms 63 ms 64 ms bl1-1.bytemark.co.uk [89.16.188.33]
8 74 ms 63 ms 64 ms <My hostname> <My servers IP>
Trace complete.
------------------------
Me to my VPS, Linux host
------------------------
<My username>@vimes(~)$:sudo traceroute -T <My site>
traceroute to <My site> (<My servers IP>), 30 hops max, 60 byte packets
1 discworld.house.local (192.168.1.1) 00.769 ms 01.111 ms 01.495 ms
2 78-33-35-106.static.enta.net (78.33.35.106) 59.238 ms 60.527 ms 63.648 ms
3 gi8-20.212.mpd01.lon02.atlas.cogentco.com (149.6.148.105) 67.077 ms 69.772 ms 62.426 ms
4 te4-2.mpd02.lon01.atlas.cogentco.com (130.117.1.17) 55.834 ms 57.778 ms 60.988 ms
5 te2-1.ccr01.man01.atlas.cogentco.com (130.117.3.166) 60.348 ms 63.307 ms 65.414 ms
6 149.6.11.38 (149.6.11.38) 69.580 ms 64.418 ms 66.343 ms
7 bl1-1.bytemark.co.uk (89.16.188.33) 68.289 ms 64.290 ms 67.909 ms
8 <My hostname> <My servers IP> 74.208 ms 62.143 ms 63.342 ms
-------------------------
My VPS to my ADSL gateway
-------------------------
<My username>@cameron(~)$:sudo traceroute -T 78.33.35.106
traceroute to 78.33.35.106 (78.33.35.106), 30 hops max, 40 byte packets
1 openmoko.truebox.co.uk (89.16.175.1) 0.577 ms 0.530 ms 0.524 ms
2 vlan858.cr01.man.bytemark.co.uk (89.16.188.2) 1.032 ms 1.032 ms 1.026 ms
3 gi2-25.man.core.enta.net (212.121.34.72) 7.817 ms 8.064 ms 8.073 ms
4 te5-2.telehouse-north0.core.enta.net (87.127.236.109) 7.753 ms 7.775 ms 8.011 ms
5 te4-4.telehouse-north.core.enta.net (87.127.246.121) 8.023 ms 8.024 ms 8.020 ms
6 te5-3.telehouse-east2.core.enta.net (87.127.236.37) 7.982 ms 7.853 ms 7.824 ms
7 te4-4.telehouse-east.core.enta.net (87.127.236.97) 7.786 ms 7.718 ms 7.863 ms
8 78-33-35-106.static.enta.net (78.33.35.106) 9.113 ms 8.896 ms 8.959 ms
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