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The datacenter in which the dedicated server hosting POV-Ray recently changed. As we
have our own class C (/24) subnet, this (in theory) should not have affected us
(outside of a few hours of downtime as the machine was physically transported) as no
IP addresses needed to change: our host only had to alter the appropriate BGP
announcement to indicate the new route to/from our network.
However it has since come to our attention that many parts of the internet are unable
to access resources on our server. Sites such as wiki.povray.org and www.irtc.org
continue to work as they are cached by Cloudflare, and Cloudflare can still talk to
our server. The problem lies in the fact that whilst we are receiving the incoming
traffic sent our way, outgoing traffic that needs to pass through Comcast is
black-holed only four hops from our server. This means anyone who is behind Comcast
addresses are unable to access anything on our server.
We have used our class C network for more than a quarter of a century with no real
issues; this is the first time we've been black-holed by a major transit point in the
US and we have no explanation for it. A request has been lodged with the Comcast NOC
to fix this but as of the time of writing it remains in place.
We're posting this message right now primarily to raise awareness amongst those who
are not affected but are in communication with those who are (via means outside this
site) to let them know why they can't connect, since of course affected users aren't
able to read this message right now.
Additionally once the issue is resolved, this will serve as an explanation as to why
we were "down" for so long.
regards,
-- Chris
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On 2026-03-14 14:44 (-4), Chris Cason wrote:
>
> We're posting this message right now primarily to raise awareness
> amongst those who are not affected but are in communication with those
> who are (via means outside this site) to let them know why they can't
> connect, since of course affected users aren't able to read this message
> right now.
I have relayed your message to two POV-Ray-related Facebook groups.
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