[SATLUG] Linux Client DNS Hostname Lookup Problem (reverse dns)

Robert Pearson e2eiod at gmail.com
Wed Jun 18 11:19:35 CDT 2008

On Wed, Jun 18, 2008 at 10:01 AM, jaret <jaret at aberlorn.com> wrote:
> Good try but resolv.conf looks good... however the network admin thinks the
> problem is my laptop has ip6 protocols rather than ip4, which is what the
> windows-based DNS is on. Does that sound about right?  If it does, are there
> any commands I could run to add support fairly easily?
> In Ubuntu, my Network Settings, Tab Hosts, had these entries for ip6 (and
> none for ip4)
> ::1   ip6-localhost ip6-loopback
> fe00::0  ip6-localnet
> ff02::0  ip6-mcastprefix
> ff02::1  ip6-allnodes
> ff02::2   ip6-allrouters
> ff02::3  ip6-allhosts

I found this site while Googliing for "ubuntu 8.04 ipv6" ---

There are 3-4 fixes required to turn off ipv6 completely.
For most people the first 3 work. For some of us the 4th fix is required. YMMV
The 4th fix is under "Instructions for Ubuntu 7.10 (Gutsy Gibbon)" in
the URL above.
It adds the line "install ipv6 /bin/true" to /etc/modprobe.d

This may not be your problem. These fixes are primarily for slow Web browsing.
Failure to resolve host names can be caused by other things.

> FIRESTORM_v1 wrote:
>> cat /etc/resolv.conf
>> and see if that matches your home network's DNS or the network's DNS
>> where your laptop is plugged in.  As a temporary fix, edit the file
>> and add your DNS servers for whatever network you're plugged into at
>> the moment.
>> Normally this file is rewritten according to your dhcp lease (i think
>> Ubuntu uses dhclient?) but in some cases I have found that I need to
>> rewrite it to be able to resolve.
>> Hope that helps!
>> On Wed, Jun 18, 2008 at 9:11 AM, jaret <jaret at aberlorn.com> wrote:
>>> Hi gang... My laptop has a Debian variant (Ubuntu 8.04) and its ethernet
>>> card is working properly. In my home network everything works great. But
>>> on-site at one of my clients everything works great except that I cannot
>>> connect to the internet using a hostname but I can connect using an IP
>>> Address. Any ideas on getting the hostname lookup to work?  When testing
>>> in
>>> Mozilla Firefox I used as my ip "" which points to a
>>> "Yahoo" info page.  I have a 2nd laptop here w/ windows on it and all
>>> works
>>> correctly. I compared linux networking info (using "ifconfig and route
>>> -nee") and matched that against WinXP (using "ipconfig /all").
>>> Thanks for any insight.
>>> ~Jaret
>>> --

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