[Ubuntu-SG] [Slugnet] DNS on Ubuntu question

desire at gmail.com desire at gmail.com
Mon Sep 6 16:33:11 BST 2010

On Mon, Sep 6, 2010 at 8:00 PM, Jeffrey 'jf' Lim <jfs.world at gmail.com>wrote:

> On Mon, Sep 6, 2010 at 4:51 PM,  <desire at gmail.com> wrote:
> > Anyway, I've also considered switching to other DNS servers, eg. opendns,
> > google public dns, pacific internet or singnet dns, etc.  Conclusion was
> > that switching would make overall browsing slower, as content
> distribution
> > networks based on anycast dns would serve content via non-optimum network
> > paths (eg, via servers in hong kong or the US instead of servers within
> > starhub's velocity program in singapore).
> how many of those would you typically come across, I wonder? Another
> option (heheh) would be to in this case keep the local dnses, but
> implement a caching resolver locally for the speed.

Do you use amazon? facebook? smugmug? slashdot?

Let's take slashdot as an example. There are 6 unique hostnames contacted
for the attached request. 5 (a.fsdn.com, ad.doubleclick.net,
b.scorecardresearch.com, pagead2.googlesyndication.com,
www.google-analytics.com) of them use anycast-based CDNs. Only
slashdot.orgitself is not using a CDN.

The 5 based on CDNs are < 25ms away from me.  I made 17 requests to them. If
I used opendns, they would be >200ms away.  469.3 KB of the traffic is
served by CDNs.  113.3 KB of the traffic is not.

The good news is that google public dns now has servers somewhere in
singapore as well (i think they were only in the us during initial launch).
 So, I could use them and should probably still enjoy good speeds, although
there may be some cases where the results might still not be optimal.
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