Re: [gentoo-user] Something went wrong with DNS, plz help!

[Grand Duet <grand.duet@gmail.com>]

2014-07-26 22:43 GMT+03:00 Peter Humphrey <peter@prh.myzen.co.uk>:
> On Saturday 26 July 2014 22:16:53 Grand Duet wrote:
>> 2014-07-26 21:19 GMT+03:00 Alan McKinnon <alan.mckinnon@gmail.com>:
>> > On 26/07/2014 18:16, Grand Duet wrote:
>> >> 2014-07-26 19:02 GMT+03:00 Alan McKinnon <alan.mckinnon@gmail.com>:
>> >>> On 26/07/2014 17:23, Grand Duet wrote:
>> >>>> The first reboot after recent update of the system have
>> >>>> shown that I cannot open any webpage in Firefox.
>> >>>>
>> >>>> More exactly, Firefox or my system cannot any more resolve
>> >>>> URL to IP address (sorry if I use wrong terms).
>> >>>>
>> >>>> Thus,
>> >>>>
>> >>>>    host gmail.com <http://gmail.com>
>> >>>>
>> >>>> gives:
>> >>>>    ;; connection timed out no servers could be reached
>> >>>>
>> >>>> Nevertheless
>> >>>>
>> >>>>     dig @8.8.8.8 <http://8.8.8.8> gmail.com <http://gmail.com>
>> >>>>
>> >>>> reports the corresponding IP adresses.
>> >>>>
>> >>>> I have not changed any my network settings and my
>> >>>> /etc/conf.d/net file still contains list of my DNS servers
>> >>>> that contains server 8.8.8.8 as well but somehow it is
>> >>>> not enough any more. :(
>> >>>>
>> >>>> During my last system update, I suddenly found that
>> >>>> I had to update about 150 packages, what was a little
>> >>>> bit strange as I update my system at least once a week.
>> >>>>
>> >>>> I have attributed that to the remnants of gnome2 (now I am using
>> >>>> fxce4) that I have not cleaned completely and that is now going
>> >>>> to update. So, I deviated a bit from my usual system update routine
>> >>>> trying to fix that. Nevertheless, as to my view, during my system
>> >>>> update
>> >>>> I did nothing to distroy the DNS lookup.
>> >>>>
>> >>>> Luckily, I save my system update logs and now can attach
>> >>>> the last one to this e-mail.
>> >>>>
>> >>>> Please, help me to recover my internet access,
>> >>>> as I still have to do a lot of real work till Monday
>> >>>> and have not enough time to investigate this problem
>> >>>> alone and without a proper internet access. :(
>> >>>
>> >>> what is the contents of /etc/resolve.conf?
>> >>>
>> >>    # Generated by net-scripts for interface lo
>> >>    domain mynetwork
>
> That isn't right. It should say it's for interface eth0. At first I thought
> eth0 wasn't being brought up, but then you quoted replies from dig,
> so it must be.

After the last reboot I magically have got the right /etc/resolv.conf
with DNS servers IPs.

Even more strange is that it happened *without* my intervention:
just a few reboots (one was no enough!).

This, by the way, reminds me MS Windows very much.

I am afraid that you will not believe me, but I really did not changed
any configuration and have not (re)emerged anything after the previous
reboot. Why it did not worked then and does work now?

It is really very strange!

>> >> That is all.
>> >>
>> >> I tried to add here lines like:
>> >>   nameserver 8.8.8.8
>> >>
>> >> but found out that this file is rewritten on every reboot.
>> >>
>> >> My net try was to create /etc/resolv.conf.tail file
>> >> and put that line there but that did not help either.
>> >
>> > Then the problem is obvious - you have no nameserver entries as you
>> > don't create any. The computer can't make them up by magic...
>>
>> But it did it just before the last update: it created DNS entries in
>> /etc/resolv.conf
>> from my /etc/conf.d/net file on every reboot. And now it "cannot do this
>> magic"?
>> > You need to create static nameserver entries because you use a static
>> > (i.e. no dhcp) configuration. Add them to /etc/resolvconf.conf
>>
>> It does not help as /etc/resolv.conf is overwritten on every reboot.
>>
>> > If it still gets removed across restarts
>>
>> Yes, it does.
>
> Do you still have netifrc installed? Maybe it got lost in all that updating
> work. Try emerging it again anyway.

As I have already written, DNS resolution now magically works
again and without any intervention from my side: just a few
reboots (one was no enough!).

So, no need to re-emerge netifrc now.

> Do your 90-network-rules look like mine?
>
> $ cat /lib/udev/rules.d/90-network.rules
> # do not edit this file, it will be overwritten on update
>
> # /etc/udev/rules/90-network.rules:  triggering network init-scripts
>
> # Activate our network if we can
> SUBSYSTEM=="net", ACTION=="add",    RUN+="net.sh %k start"
> SUBSYSTEM=="net", ACTION=="remove", RUN+="net.sh %k stop"

My file is exactly the same, and it was changed on May 10, 2014 last time.
So, it could not be the cause.

> I'm clutching at straws here, and I hear others doing the same  ;-(

Everything is very, very strange.