Use STUN Server to Get External IP

[MateusAmin]

If you use a stun server to get the external IP external-dns will work in any internet connected network. Even if the external IP is changing (home/small business networks). Even if it is behind a NAT (home/small business networks). The work required is straight forward not considering the context of the current code base.

Hit a STUN server and get your public IP address. Here is a Golang API with a STUN client. Looks like ~20 lines of code.

Here are some public stun servers:

• stun.l.google.com
• stun1.l.google.com
• stun2.l.google.com
• stun3.l.google.com
• stun4.l.google.com

Config:
Could it always use stun? Even if just to validate. Ah, but people might be using it for internal DNS. hmmmmmmm, maybe need a flag. Maybe External/Internal. If the stun serve is down or not configured fallback to "external IP" in k8s. But have the public stun list configure by default in external.

This seems like perfect solution for my at home setup. Please let me know if there is already tooling for this in k8s. Right now I set most of this up router side outside the cluster.

[rjhenry]

+1 for this - would be incredibly handy to have for some on-prem clusters where load-balancers hand out internal IP addresses.

[D-o-c]

+1 for this in my home setup :) would be wonderful 😍😍

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/lifecycle stale

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/lifecycle rotten

[rjhenry]

/remove-lifecycle rotten

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/lifecycle stale

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/lifecycle rotten

[MateusAmin]

/remove-lifecycle rotten

[MateusAmin]

This automated solution would remove the need for this manual assignment feature:

#588

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/lifecycle stale

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/lifecycle rotten

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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/close not-planned

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[MateusAmin]

/remove-lifecycle rotten

[MateusAmin]

/reopen

[k8s-ci-robot]

@MateusAmin: Reopened this issue.

In response to this:

/reopen

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