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Posted by danny burstein on November 27, 2007, 12:18 pm
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>>Interestingly Cox used to suffer from frequent DNS failuers but over the
>>past year or so that's gotten much better.
>>
> Many ISPs have overloaded DNS servers. I run my own caching
>recursive lookup server on my firewall at home. Easier that way.
Just wondering about that issue, and I may be showing
my complete ignorance here....
In the Good Old Day if you looked up a web page there
was one DNS query for that specific URL, and typically
the relevant info was cached by your own system for a bit
so when you went to the next page in that file, you already
had the IP address.
Nowadays, though, each web page may include a dozen
advertisements or other add-ons. And they'll be
changing minute by minute.
Would this be be a noticable increase in DNS load?
Thanks
--
_____________________________________________________
Knowledge may be power, but communications is the key
dannyb@panix.com
[to foil spammers, my address has been double rot-13 encoded]
***** Moderator's Note *****
Since most ads are served by a separate IP address, the answer to your
question is "Yes, it does increase DNS traffic by a _lot_".
It also allows Doubleclick and similar advertising providers to track
your internet usage across different sites: each URL for an ad
includes a code that identifies the site and page you're viewing, and
the Doubleclick servers use the information to build a profile of your
surfing habits and thus target ads to you based on what you've looked
at in the past.
Since putting these ads on your browser depends on a lot of DNS
lookups, there's a simple solution: break the DNS lookup for
advertisements, so they never appear on your screen! Once you do that,
you'll get both better privacy and a great boost in speed.
Your computer actually checks three places for DNS info:
1. The HOSTS file on your computer is checked _first_. This is
a legacy from the days of ARPANET, before DNS was deployed:
each domain name had to have a matching IP address stored
on each computer, and it's still in use.
2. The DNS cache is checked next.
3. If _both_ checks fail, your machine will perform a DNS
querry to match the URL to an IP address.
Ergo, you need only "poison" your HOSTS file to prevent your browser
from attempting to retrieve ads. Your computer will look at the HOSTS
file, find a dummy entry, and then attempt to retrieve the ad from an
invalid IP address, usually the "Loopback" address, which points back
to your own machine.
There are several sources for ready-to-use HOSTS files which contain
poisoned entries for most major advertising servers, but I'll refrain
from mentioning them here. Google is your friend: they're not hard to
find.
Bill Horne
Temporary Moderator
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Posted by Joseph Bender on November 29, 2007, 1:07 am
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says...
>
[SNIP]
>
>Nowadays, though, each web page may include a dozen
>advertisements or other add-ons. And they'll be
>changing minute by minute.
>
>Would this be be a noticable increase in DNS load?
>
Yes.
>***** Moderator's Note *****
>
[SNIP]
>
>Ergo, you need only "poison" your HOSTS file to prevent your browser
>from attempting to retrieve ads. Your computer will look at the HOSTS
>file, find a dummy entry, and then attempt to retrieve the ad from an
>invalid IP address, usually the "Loopback" address, which points back
>to your own machine.
>
The better way to do this is to use Firefox, install Adblock Plus,
and select from any number of preconfigured blocklists. While HOSTS
poisoning works, it can lead to stalling browsers and broken page layout,
while an intelligent adblocker will preserve this.
--
Joseph C. Bender
jay cee bender residing on bendorius period com
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Posted by T on November 29, 2007, 4:21 pm
If you were Registered and logged in, you could reply and use other advanced thread options
> says...
> >
> [SNIP]
> >
> >Nowadays, though, each web page may include a dozen
> >advertisements or other add-ons. And they'll be
> >changing minute by minute.
> >
> >Would this be be a noticable increase in DNS load?
> >
> Yes.
>
>
> >***** Moderator's Note *****
> >
> [SNIP]
> >
> >Ergo, you need only "poison" your HOSTS file to prevent your browser
> >from attempting to retrieve ads. Your computer will look at the HOSTS
> >file, find a dummy entry, and then attempt to retrieve the ad from an
> >invalid IP address, usually the "Loopback" address, which points back
> >to your own machine.
> >
> The better way to do this is to use Firefox, install Adblock Plus,
> and select from any number of preconfigured blocklists. While HOSTS
> poisoning works, it can lead to stalling browsers and broken page layout,
> while an intelligent adblocker will preserve this.
>
>
>
I'll second Firefox and AdBlock Plus. Another good one is FlashBlock
although that recently fouled me up when trying to view blip.tv videos.
I finally whitelists blip in FlashBock and now everything works fine.
One thing that would be interesting to discover is why all of a sudden
Vonage's Account Activity site doesn't work with Firefox, but works fine
with IE.
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Posted by Koos van den Hout on November 30, 2007, 10:29 am
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> > Many ISPs have overloaded DNS servers. I run my own caching
> >recursive lookup server on my firewall at home. Easier that way.
> In the Good Old Day if you looked up a web page there
> was one DNS query for that specific URL,
Just for the hostname part, to be pedantic about it ;)
> and typically
> the relevant info was cached by your own system for a bit
Depending on operating system, local resolver and browser.
> so when you went to the next page in that file, you already
> had the IP address.
Most probably.
> Nowadays, though, each web page may include a dozen
> advertisements or other add-ons. And they'll be
> changing minute by minute.
Yes, lots of adservers use DNS tricks in order to be able to make rapid
changes which defeats the caches at your ISP, in your OS and in your
browser (although not all use the timetolive data correctly). With
added DNS tricks and redirects so you will get stuff from a server in
the same part of the world or from a content-delivery network when you
are visiting a big and popular site.
> Would this be be a noticable increase in DNS load?
Yes! A lot. The other increase is from anti-spam measures: a lot of
anti-spam measures use information distributed via DNS which means quite a
number of lookups are done to deliver an e-mail. Although this won't affect
the resolver that you use for your home (unless you run your own
mailserver) but it will affect the resolver for the mailserver of the ISP.
Koos van den Hout
--
Koos van den Hout, PGP keyid DSS/1024 0xF0D7C263 via keyservers
koos@kzdoos.xs4all.nl or RSA/1024 0xCA845CB5 -?)
Fax +31-30-2817051 Visit the site about books with reviews /\
http://idefix.net/~koos/ http://www.virtualbookcase.com/ _\_V
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