Re: [HTCondor-users] dual-stack set up: moving away from IPv4 preferences

["Fischer, Max (SCC)" <max.fischer@xxxxxxx>]

Hi Thomas,

We did the switch from IPv4-only to IPv6-only a while ago and I can really recommend to take baby-steps to test the waters. PREFER_IPV4 = false on a few machines is a good way to get started while having a safety net; things will fall back to IPv4 gracefully most of the time - that is, if your network setup isnât entirely borked and daemons just wait ages for timeouts.

Still, I recommend an extra baby-step in-between: use condor_ping with disabled IPv4 (works nicely via environment variables) to check that the daemons can communicate via IPv6.

Cheers,
  Max

> On 19. Feb 2024, at 17:20, Thomas Hartmann <thomas.hartmann@xxxxxxx> wrote:
> 
> Hi all,
> 
> not a critical issue more out of curiosity, but I just noticed, that due to the default
>  PREFER_IPV4 = true
> the daemons all still prefer IPv4 on our dual-stack clusters.
> 
> Now, with preparing a cluster revamp in progress, I am curious if there are any points in embracing IPv6 and switch PREFER_IPV4 to false...?
> 
> Cheers,
>  Thomas
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