Re: Ask EU: web hosts again
- From: john wright <john@xxxxxxxxxxxxxxx>
- Date: Sun, 06 Jun 2010 15:52:42 +0100
On 06/06/2010 15:04, the Omrud wrote:
On 06/06/2010 13:21, J. P. Gilliver (John) wrote:
The DNS - domain name server/service - is the machinery that turns
gloucestershire-arts-and-crafts.webs.com into 22.214.171.124; most ISPs
keep a list, which is kept up-to-date by talking to other DNSs, and so
on. If the entry (for gloucestershire-arts-and-crafts.webs.com) in a
DNS's table points to something that isn't responding, users can't see
it until the table gets corrected (they can see the site if they type in
126.96.36.199 instead of gloucestershire-arts-and-crafts.webs.com, but
that's not a lot of help to you).
Actually, no they don't: perhaps otherrats who understand these things
better than I do might be able to explain, as it might be germane. I got
the 188.8.131.52 address by pinging
gloucestershire-arts-and-crafts.webs.com (either using Turnpike's ping
function or opening a command prompt and just typing
into it); both ping methods give no response, whereas pinging
www.bbc.co.uk tells me that that is 184.108.40.206 and that does respond
(They're called pings by analogy with the sonar sound and submarines.
Some sites don't respond to pings, but do to web page requests, so the
lack of response to pings doesn't necessarily mean anything's wrong.)
The relevant rfc's state that they must respond to pings, but many
services disable ping at the firewall, to avoid certain types of attack.
The rules were written in a simpler time when everybody on the Net was a
In my last job, I had a nice little ping application from tucows or somewhere. Having used it one day, not long after the head of our IT section came up and told me that it was the sort of thing crackers used to break into networks and things. Ergo don't do it again...
Use your imagination Marvin!
Life's bad enough as it is - why invent any more of it.
- Prev by Date: Re: Ask EU: web hosts again
- Next by Date: Re: Ask EU: web hosts again
- Previous by thread: Re: Ask EU: web hosts again
- Next by thread: Re: Ask EU: web hosts again