So far I know of two PTCL Broadband customers facing this issue, one of which is me. If more of you are affected out there do share what you’re seeing about this issue.
So recently – for about two weeks or so – if you browse to certain blogs on the web you dont see the latest content but content that’s really old… sometimes one or two months old.
This isnt a browser issue because clearing browser caches does nothing…. I follow engadget.com and techcrunch e.g…. both of these will do well over 20 posts in any average day. So I’ll see the posts for one day, and the next day the page will be showing posts from Jan 5th, or Feb 20th, or Feb 16th, or last Sunday etc… I notice that (1) its always those specific dates… there’s this engadget story from CES about some iPod video goggles that I’ve seen "featured" on the front page atleast a dozen times now (its from Feb 16th)…. also (2) when this is happening the page loads up in a snap lightning fast, and that the internet was slowing down slightly just before it.
Yesterday, and even today, this same issue perplexed me at greenwhite.org – we updated the blog styles and replaced many of the old images with new ones… yet even though the webserver doesnt physically have that file anymore my browser shows the new theme for a while and then magically starts showing the old "greener" theme…. hmm maybe it misses the old paki theme too.
My working theory (and excuse me if half a dozen blogs already talked about this… I’m out of touch a bit) is that PTCL is using some edge-caching mechanism at their exchanges to offset disruption in normal internet behavior. Islamabad customers in particular have been noticing a lot of connection drops over the past few months and perhaps this cache kicks in whenever some backhaul connection goes out.
But whats worse, its a pretty poor cache if its only caching things approx once in 7 days… that doesnt really work for blogs.
So is there a secret cache directing traffic or not? So far its just conspiracy theories but if you know anything more about this do let us all know.