Tuesday, June 05, 2018

Send public IP / Alias / Reported in Round Robin manner

Hi.

Some days ago I received a second public IP address ("B") for my VPS /
OpenBSD system. In order for this ip to be available I added it as an
alias to my first public IP "A" as described in [1].

I am also running an OpenVPN server on this machine.

When I check for the public ip [2] the original IP "A" is constantly
reported.

When I check from a connected VPN client the public IP is returned in
a "Round Robin" manner, switching between "A" and "B" for each check.

As I understand this problem is likely related to my pf.conf.
Before I go into that I'm wondering how this "round robin" behavior is
even possible in the first place.

Thank you for your feedback and comments.

B.W.

---
[1] "Setting up aliases on an interface"
https://www.openbsd.org/faq/faq6.html
[2] for example with `curl ipinfo.io/ip`

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