[RndTbl] Learning a little about /etc/hosts
Sean Walberg
sean at ertw.com
Sat Aug 7 13:19:54 CDT 2010
I don't know the answer to your question, but it seems easy enough to find
out:
(Windows XP SP3)
C:\>ping foo.hhjjhhjjhh.com
Ping request could not find host foo.hhjjhhjjhh.com. Please check the name
and try again.
C:\>echo 127.0.0.1 *.hhjjhhjjhh.com > c:\windows\system32\drivers\etc\hosts
C:\>ping foo.hhjjhhjjhh.com
Ping request could not find host foo.hhjjhhjjhh.com. Please check the name
and try again.
C:\>echo 127.0.0.1 foo.hhjjhhjjhh.com >>
c:\windows\system32\drivers\etc\hosts
C:\>ping foo.hhjjhhjjhh.com
Pinging foo.hhjjhhjjhh.com [127.0.0.1] with 32 bytes of data:
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
...
I'll leave it as an exercise to you to test the same on Linux.
BTW, why are you blocking Amazon S3?
Sean
On Sat, Aug 7, 2010 at 1:04 PM, Mike Pfaiffer <high.res.mike at gmail.com>wrote:
> At the lab the teacher advocates using the Windows equivalent of the
> /etc/hosts file to prevent access to certain sites from classroom
> computers. He and I have been having an ongoing chat about this for a
> few months. I've been reading up on the way the file is used to redirect
> requests to a different address (eg. 127.0.0.1). Is there a difference
> in the way Windows parses the file compared to Linux?
>
> One reason for the above question is I was thinking it might be
> useful
> to redirect requests to advertising sites to 127.0.0.1 to speed up
> access on days when things seem to crawl. One article I read on Digg
> suggested a lot of the wait time for web pages was due to slow and
> misconfigured ad servers. I found one site which has example files which
> are updated so often. I tried one and I got almost nothing when surfing
> the web. Using the file as a pattern I created a smaller version which
> works well with the chromium browser but fails to display text in firefox.
>
> These are the lines I've added. Yes I know there are duplicates.
>
> 127.0.0.1 media.fastclick.com media.fastclick.net
> 127.0.0.1 *.tribalfusion.com a.tribalfusion.com
> 127.0.0.1 cdn.optmd.com
> 127.0.0.1 ad.doubleclick.com ad.doubleclick.net *doubleclick.net
> googleads.g.doubleclick.net
> 127.0.0.1 as.casalemedia.com
> 127.0.0.1 ads.adsonar.com
> 127.0.0.1 seeker.dice.com
> 127.0.0.1 townhall.com
> 127.0.0.1 s3.amazonaws.com
> 127.0.0.1 pixel.quantserv.com
> 127.0.0.1 st.blogads.com
> 127.0.0.1 *.rackspacecloud.com
> 127.0.0.1 js.adsonar.com
> 127.0.0.1 ads.pointroll.com
>
> Would the "*" in the domain name cause problems? Like I said, I used
> the Windows file as an example.
>
> Later
> Mike
>
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--
Sean Walberg <sean at ertw.com> http://ertw.com/
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