Cable Forum - 100M DNS issue?

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- - 100M : DNS issue? (https://www.cableforum.uk/board/showthread.php?t=33698097)

Quote:

Originally Posted by qasdfdsaq (Post 35710968)

I think the difference it makes (in speed) increases the further you get away from London. VM's advantage is having local DNS caches around the country in each part of their network - external providers such as Google or OpenDNS don't. Hence if you're in South-East England, you're looking at maybe 3-5ms to VM's nearest DNS servers or 5-10ms to everyone else's in London. In Scotland you're looking more like 3-5ms to VM's nearest DNS servers or 15-20ms to London.

You say that, but both OpenDNS and Google's DNS seem consistently faster than Virgin's for me - and I'm in the bloody north west!

http://i.imgur.com/4STxRLl.png

Of course I know pinging isn't the same as actually doing a lookup, but various DNS benching tools I've tried tend to give similar results to what I see there. ~10ms here and there probably isn't going to kill me or anything, but the stability can't be sniffed at.

Quote:

Originally Posted by qasdfdsaq (Post 35710968)

As for outages, can't say I notice them much, but admittedly during the years I was with VM I usually had Google DNS set anyway mainly because it was just easier to remember when entering network settings by hand!

I hear that! Though for some reason, OpenDNS's IP's seem permanently ingrained in my head. I've been using them since long before Google DNS was a thing, though. When I was at Virgin, I always got customers to ping an IP address, usually Virgin's DNS, to rule out DNS issues right away. If I was in doubt, pinging 208.67.222.222 was another good way to check for a DNS fault.

Now that I sort of manage Active Directory at work (Thankfully not Virgin), I've since learned that DNS is nearly always the cause of issues for everything. If in doubt, it's probably a DNS fault.

I do wonder if anyone will ever score the equivalent IPV6 address... 8.8.8.8 was a steal for Google.

Quote:

Originally Posted by Kushan (Post 35711017)

Y...... but various DNS benching tools I've tried tend to give similar results to what I see there. ~10ms here and there probably isn't going to kill me or anything, but the stability can't be sniffed at.....

SamKnows DNS sampling via Brighton brig15 and my BN3 node recorded DNS failures(or lag/prolonged response times) starting on 24June.
https://www.cableforum.co.uk/images/...2014/07/38.png

Usually these tend to average around 13ms.
Namebench tests indicated VM secondary DNS hit 1036ms average with 98% deviation from 6ms to 5000ms+ maximum at one point.

Quote:

Originally Posted by horseman (Post 35711067)

SamKnows DNS sampling via Brighton brig15 and my BN3 node recorded DNS failures(or lag/prolonged response times) starting on 24June.
https://www.dropbox.com/s/6ffpuvwz2k...2005.54.47.png

Usually these tend to average around 13ms.
Namebench tests indicated VM secondary DNS hit 1036ms average with 98% deviation from 6ms to 5000ms+ maximum at one point.

Jesus, that's some frightening latency.

Quote:

Originally Posted by qasdfdsaq (Post 35711034)

I do wonder if anyone will ever score the equivalent IPV6 address... 8.8.8.8 was a steal for Google.

I believe Level 3 actually own the address, Google just leases it from them.

Facebook's is the best IPv6 address I've seen so far and even that's nothing amazing:

2a03:2880:2110:df07:face:b00c:0:1

As all publicly routable IPv6 addresses need to start with 2 (as far as I understand), I guess the nearest equivalent to 8.8.8.8 would have to be something like 2222::2222 or something else symmetrical like 2345::5432.

Well I'd love to lease it... Just so I can do DNS poisoning attacks against everyone who uses Google DNS >_>

Yeah face:b00c:0:1 isn't particularly impressive, pretty much anyone can arbitrarily allocate anything they want inside their own /32. :dead:beef:0:0

If you got ahold of 8.8.8.8 you could probably rickroll a good third of the internet, if not more.

Getting rickrolled would be the least of their worries.

Virgin DNS fubared again, could it be a DDOS attack? Seems weird two biggest isps have this issue

Especially as it has been going on since Friday. It must be very frustrating for the customers involved. Hopefully it will give VM pause for thought and maybe make them reconsider allowing customer dns entries on the shub (and maybe that is the point of the ddos :))

Lol, i love that they take a jab at the shub. You can fix the problem by specifying your own dns servers such as google but the shub wont let you do it :)

More DNS problems here in Leeds today!
11.00 @10.5Ms 12.00 @ 360Ms then 13.00 @ 11.5Ms.
Seems to be o'k now running 11.0Ms.

Had issues here last night in Bristol BS34 . Changed my ipad DNS TO 8.8.8.8,no issues

ps,
I was using the DNS 8.8.8.8,but still was experiencing issues??

Then you have a different issue.