From: Doug@hyperspace.vogon.gov   
      
   Carlos E. R. wrote:   
   > On 24/07/2021 12.44, Andrew wrote:   
   >> One of my computers is refusing to update, zypper says it cannot resolve   
   >> download.opensuse.org.  The problem was first seen around 14 hours ago   
   >> and an update had succeeded 48 hours before that.   
   >> It is the only system I have which uses Network Manager, it is also ipv4   
   >> only (hardware reasons) although in that respect it is not the only one.   
   >>   Other xxx.opensuse.org sites *are* accessible to it.   
   >>   
   >> I will have more time to attack this problem tomorrow, this query is   
   >> just on the off-chance that someone else has seen this.   
   >> My suspicion was name-resolution on the router - I set up DNS over TLS   
   >> (DoT) recently with the primary server being dns.quad9.net - but things   
   >> still worked for 48 hours after I made that change.   
   >>   
   >> OpenSUSE 15.3 Leap, fully patched.   
   >   
   > Sometimes it is not download.opensuse.org which doesn't resolve, but the   
   > mirror that you get redirected to. It is not easy to find out.   
   >   
   > Another typical problem would be trying to use https instead of http.   
   >   
   >   
   > You will have to diagnose. Start with:   
   >   
   > host -v download.opensuse.org   
   >   
   > in the problem computer.   
   >   
      
   Host download.opensuse.org not found: 2(SERVFAIL)   
   Received 39 bytes from (an-ipv6-address)#53 in 0 ms   
      
   This particular system is hooked up seamlessly via a cable to a WLAN   
   device which then goes to the router, all this being invisible to the   
   PC.  That WLAN forwarder only knows ipv4.   
   It looks as though the problem could be the router returning an ipv6   
   address, even though the PC "knows" that it should only be using ipv4.   
   Other addresses work.   
      
   It's late here.  Tomorrow.   
      
   Thanks though   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)