On 20/10/12 09:12, Tim wrote:
Bob Goodwin:
I was afraid that's what it meant and that explains some of the odd
results I've been seeing when changing my dns settings. It also means
that I am not getting the services I paid Opendns for which raises a
question of ethics. Should Opendns have known that a particular ISP
operates this way? Wildblue/Viasat is a major ISP!
I can't see any DNS service being able to keep track of the hundreds, or
thousands, of ISPs around, to know what they're up to. Sure, if they're
informed of known ISPs, they could forewarn customers about problems.
But that would depend on some automatic system being created, and they'd
have separately ask what ISP you use, or presume what your ISP is based
on your email address (which don't have to be related).
A bit of googling reveals that this change apparently came about
with our move to the higher speed Viasat Exede service in March of
this year and I've only just discovered it. Opendns worked until
then and I gather from one item I read that they weren't aware of
this either, are now though I imagine.
I'd enquire of your ISP if there's a way around their proxying. Perhaps
they have per-user preferences, some ISPs do (different network settings
for certain classes of users, or users have a control panel to adjust
some features, for themselves).
I found the following at
http://www.wildblueworld.com/forum/showthread.php?t=6148&highlight=opendns
If you don't use the WB DNS then your downloads will be far slower
and your bandwidth usage much higher, in fact as much as three times
higher. Using a different DNS bypasses Exede's AcceleNet technology.
Quote:
ViaSat’s solution to the space-based delay was to invest in a fast,
efficient ground network system. On a typical network, when a
computer requests a website, it gets an inventory of Web-based
objects to call up and assemble. If the computer is wired to the
Web, that assembly happens so quickly that the user doesn’t notice.
But if the computer is linked to the Web via satellite broadband,
every object request has to go through the half-second
call-and-response routine. A page like CNN.com can have hundreds of
objects, and the computer has to call each one individually.
ViaSat, however, does most of the back-and-forth work for the
subscriber’s computer in advance. When an Exede subscriber accesses
a website, ViaSat’s ground network preassembles it and beams it up
in a tight package, reducing lag time to the half-second minimum.
The company calls this system AcceleNet. Not only does it speed a
subscriber’s Web experience, it conserves bandwidth on the satellite
by sending the Web page in a single shot.
You can't change the DNS settings on the modem but you can change
them in the router or in your operating system.
Which leaves wondering if there's a Linux solution available for my
non-VPN system?
The only other way I could see of circumventing this, by yourself, would
be if you had an external DNS server that could be queried on
non-standard ports. Your ISP is, probably, only proxying requests over
the usual DNS server ports.
Yes, it's a major pain when you have a limited choice of ISPs. We're
lucky to have choices where I am. But for a long time, it was often a
choice of ludicrously expensive ISPs (that weren't always that good),
versus various little ISPs (which were often over sold - too many
customers, not enough incoming lines or bandwidth). Now, we tend to
have quite a few reasonable ones to choose from.
I suppose I should ask why you want to use alternative DNS servers. Are
your ISP's not good enough/censoring/filtering?
At the time we had fair but not great speeds and I was casting about
for anything that claimed to improve things and opendns offered
additional protection against malware. I really had no complaint
with the provided dns ...
I started running my own DNS servers due to having two or three ISPs, in
a row, with awfully slow DNS servers. One of them, which is the main
backbone for the whole country, couldn't even get their own DNS records
to stay working for their own news server. I always had to put its IP
in my hosts file.
So it looks like my ISP is what it is and I probably can't change
things without degrading the service I have now which is quite good
when it works. Their are minor glitches that I have not been able to
assign the blame for, it occasionally requires re-booting either the
Viasat "modem" or my router, or both amidst a lot of confusion with
my daughter trying to do something important to her on her Mac
downstairs.
If nothing else this has been a learning experience.
Thanks,
Bob
--
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box9
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