To reply to myself. I swapped the router for a spare ADSL router and found that all the sites that had not been accessible were now accessible. As it wasn't an ASDL2+ router my connection speed fell by more than 50%, but at leas it confirmed it wasn't an issue with any of my PCs or my ISP.
I factory reset my old router and reconnected it to my ISP - with minimal configuration - and it still had issues. I can't flash the router as it's not an off-the-shelf model but an old ISP "tweaked" version that will not accept the latest OEM standard firmware. In the end I bought a new ADSL2+ router, configured it to my ISP and all is now well, I've got proper connectivity and it's even marginally faster than the original ADSL2+ router. On Sun, 13 Jul 2014 at 11:32:47AM +0100, Dr Adam John Trickett wrote: > Hi, > > A few weeks ago when there was the big DNS issue I started to have problems > accessing certain sites, twitter being one of them. After a few days I > assumed > it would get better but even now I'm getting odd results from any computer on > my home network using my local DNS. > > Some sites work fine but some such as twitter, or Map My Ride are unusable. > > I've flushed all the caches in the browser and even tried different DNS > servers > - bypassing my own, and even restarted my ADSL connection but I can't see > what > the problem is. > > All the sites I try come up okay for the base page but struggle when it comes > to the sub components, such as images, javascript and CSS which is often on a > fancy CDN server at couldfront etc. > > It's like there are some duff DNS entries cached somewhere, but I don't know > where they would be to purge them. > > -- > Adam Trickett > Overton, HANTS, UK > > I've found that people who are great at something are > not so much convinced of their own greatness as > mystified at why everyone else seems so incompetent. > -- Paul Graham, "Great Hackers" 2004 > > > -- > Please post to: Hampshire@mailman.lug.org.uk > Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire > LUG URL: http://www.hantslug.org.uk > -------------------------------------------------------------- -- Adam Trickett Overton, HANTS, UK Windows has detected: "unknown device", and is installing drivers for it. -- Microsoft Windows -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --------------------------------------------------------------