[sf-lug] resolver problem

Alex Kleider akleider at sonic.net
Wed Apr 6 09:22:05 PDT 2016

On 2016-04-06 12:01, Michael Paoli wrote:
> I don't think we're seeing an IPv6 issue, in this specific case.
> And why do I say that?:
> $ dig +short github.com. A github.com. AAAA
> $
> Chromium works, but Firefox doesn't?  That sounds odd.
> And in both cases, with full URLs?  E.g. starting with:
> http://
> or:
> https://
> and having a / after the hostname (and optional port) portion?
> That sounds a bit odd to me, if that's the case.  Some difference in
> cache with them (have you cleared cache, and still same results?),
> or proxy settings, or possible (partial?) application/system 
> compromise?
> Or some plugin/addon in browser that's causing issues?
> What if one boots off of known good clean ISO image on DVD/CD/USB?
> Do the same problems still persist and in same manner?

I shutdown, removed the hard drive and booted from the ubuntu CD:
everything works as expected-
I assume it is safe to say that what ever the problem is, it's to do 
something wrong on my hard drive- presumable some configuration 
not a hardware issue.

Interestingly enough, ping6 does NOT work.
ubuntu at ubuntu:~$ ping github.com
PING github.com ( 56(84) bytes of data.
64 bytes from github.com ( icmp_seq=1 ttl=52 time=88.3 
64 bytes from github.com ( icmp_seq=2 ttl=52 time=89.2 
64 bytes from github.com ( icmp_seq=3 ttl=52 time=88.3 
--- github.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 88.321/88.631/89.249/0.555 ms
ubuntu at ubuntu:~$ ping6 github.com
unknown host
ubuntu at ubuntu:~$

Before doing the above, I checked firefox vs chromium again
and the exact same urls complete with he protocol part at the beginning
were resolved by the latter, not by the former.

How does one clear cache?


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