[aklug] Oddity in network connection related to DNS

[bryanm at gci.net]

General techniques:
check logs
turn on verbose reporting
inspect network traffic

as a start.

--
Bryan Medsker
bryan at gnomon.xyz 

----- Original Message -----
From: "Christopher Howard" 
To:"AKLUG at aklug.org" 
Cc:
Sent:Tue, 12 Sep 2017 11:05:18 -0800
Subject:Re: [aklug] Oddity in network connection related to DNS

 Hmm, I cleared the browser cache and now have no browse either...
This
 smells of some kind of firewall problem not allowing the dns to get
 through.

 On Tue, 2017-09-12 at 11:01 -0800, Christopher Howard wrote:
 > Hi list, I'm testing an Sat Int system before sending to field, and
 > I'm
 > running into something strange. My main test systems are a Debian
 > Jessie notebook, and then a Debian Squeeze laptop I pull out to
 > confirm
 > a problem is not just related to one system only. So, for the most
 > part
 > everything looks fine with this connection:
 > 
 > The Good
 > - Getting the right IP address from DHCP server on modem
 > - Getting the right default gw from DHCP on modem
 > - getting correct DNS server from DHCP on modem (checked
 > /etc/resolv.conf)
 > - I have no trouble browsing any site on the Internet through
Firefox
 > (I don't use a proxy)
 > - I can ping any IP address I want from the command line
 > - Firewall is wide-open (for testing purposes)
 > 
 > The Bad:
 > - If I try to do anything else on the command line involving a DNS
 > name
 > (google.com, etc.) the command fails, acting like it cannot query
 > DNS.
 > So, for example, I cannot "wget google.com" (unable to resovle host
 > address...) and I cannot ping google.com, and I can not even "dig
 > @8.8.8.8 google.com" (same for other Web sites).
 > 
 > I don't have this problem on any of our other connections, so I'm
 > nervous something is wrong with the configuration of my modem. Does
 > anybody have any suggestions as to what might be going on, or how
to
 > narrow it down?
 > 
 -- 
 Christopher Howard
 Computer Assistant
 Alaska Satellite Internet
 3239 La Ree Way
 Fairbanks, Alaska 99709
 1-888-396-5623
 https://alaskasatelliteinternet.com
 personal web site: https://qlfiles.net
 https://emailselfdefense.fsf.org/en/


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