Experimental Physics and
Industrial Control System

Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov> · Fri, 24 Mar 2023 09:59:48 -0700

On 3/24/23 09:15, Andrew Johnson via Tech-talk wrote:

Hi Torsten,

On 3/24/23 10:07 AM, Torsten Bögershausen wrote:

I stumbled accross the same problem today.

I had over 100 emails in my inbox from our Jenkins CI-system about failing jobs because of this...

Why do you have 20 IP addresses ?

Shouldn't there simply be a hostname ?

That may be due to an architecture change on their side. In the past the github.com DNS entry had multiple IP addresses and the actual SSH server you talked to was picked at random from that list. Now it looks like there is only one IP address, and it's in a different range than the older addresses that appear in my known_hosts files. I'm deleting all of those other entries.

The view for me:

$ dig +noall +answer github.com
github.com.             31      IN      A       192.30.255.113> $ dig +noall +answer -x 192.30.255.113
113.255.30.192.in-addr.arpa. 3419 IN    PTR     lb-192-30-255-113-sea.github.com.

I guess "lb-" abbreviates Load Balance.

It looks like my known_hosts file was hashed at some point, which complicates
cleaning out all of these IP entries in one go.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System