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

[Jeffrey 'jf' Lim]

On Mon, Sep 6, 2010 at 11:33 PM,  <desire at gmail.com> wrote:
> 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?

:) for the most part, hardly, actually.


> 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.org
> itself is not using a CDN.

I'm not so sure akamai uses anycast (a.fdsn.com, ad.doubleclick.net,
... and I didnt bother to check the rest). They resolve to your
nearest ip address (rather than anycast) - but these are all different
ip addresses.


> 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.
>
>

-jf


--
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."
    --Richard Stallman

"It's so hard to write a graphics driver that open-sourcing it would not help."
    -- Andrew Fear, Software Product Manager, NVIDIA Corporation
http://kerneltrap.org/node/7228