Thanks Jeremy! That is useful information. I hope you have time to
read/answer a couple of things I am inserting below:
On 1/18/07, Jeremy C. Reed <
reed@reedmedia.net> wrote:
>
> On Thu, 18 Jan 2007, Dazed_75 wrote:
>
> ...
> > It would appear that on hplaptop, the name resolution used by ping,
> > tracepath, and traceroute is NOT being done through a DNS call. Any
> clues
> > would be appreciated.
>
> ping and traceroute use gethostbyname to do the name lookup. While dig
> and nslookup use DNS directly.
Should I have known or been able to learn this easily in some fashion? I
had assumed there was a difference but had no clue where to look to find the
difference.
When using gethostbyname, it uses nsswitch.conf, host.conf or other
> chooser to select which sources for DNS lookups to use and what order to
> use.
I thought of nsswitch but it was close to the end of the meeting and had no
time to read the man page. I will do so. Actually I remembered it affected
lookup sequence from my job back in the 80-90's but not how or how to use
it.
Commonly your local file /etc/hosts is used first and then normal DNS
> lookups is used if needed. Your normal DNS lookups are controlled by
> /etc/resolv.conf.
>
> So start by looking at /etc/hosts and then /etc/resolv.conf.
We did check /etc/hosts and cleaned it up and later rebooted. I was not
sure if the file might be cached or how to force a re-read so the reboot was
to ensure that. I did not think to check /etc/resolv.conf since we were
able to surf the net. But now I think on it maybe we were bypassing dnsmasq
on the router and going directly to the ISP dns servers. I will ask the
owner to check this. I would have thought though that /etc/resolv.conf
would have been updated as a result of the DHCP request when the system was
rebooted. Am I wrong there?
Jeremy C. Reed
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