How to certbot standalone bind to specific IP in multihome system?

[baneff]

Hello. How to certbot standalone bind to specific IP in multihome system? Thank you.

[Osiris]

I don't have experience with binding the standalone plugin to a certain IP address, but there is a single line of documentation about that:

https://certbot.eff.org/docs/using.html#standalone

Use --<challenge-type>-address to explicitly tell Certbot which interface (and protocol) to bind.

Unfortunately, that's the only thing about binding to something in the whole documentation. No examples, nothing. And the option itself says "address" and the explanation behind it says "interface". Soooo, I guess you'll have to experiment a little bit..

Ah, I found some more at User Guide — Certbot 2.7.0.dev0 documentation

testing:
The following flags are meant for testing and integration purposes only.

(…)

--http-01-address HTTP01_ADDRESS
The address the server listens to during http-01
challenge. (default: )

I have no idea why this is in the testing section of the command line help section and not at standalone..? I didn't search for it in testing for obvious reasons.

So it seems if you run certbot --help standalone it does show the option, but the using.html documentation does not show it at that location, probably because it only shows the option once?