# Register multiples wifi networks on OpenBSD

* Author: Solène
* Date: 05 August 2021
* Tags: openbsd
NIL=> https://bsd.network/@solenepercent/106704700824214413 Comment on Mastodon

# Introduction

This is a short text to introduce you about an OpenBSD feature arrived in 2018 and that may not be known by everyone.  Wifi interfaces can have a list of network and their associated passphrase to automatically connect when network is known.

=> https://undeadly.org/cgi?action=article;sid=20180512130811 phessler@ hackathon report including wifi join feature

# How to configure

The relevant configuration information is in the ifconfig man page, look for "WIRELESS DEVICES" and check the "join" keyword.

=> https://man.openbsd.org/ifconfig.8#join OpenBSD ifconfig man page anchored on the join keyword
=> https://www.openbsd.org/faq/faq6.html#Wireless OpenBSD FAQ about wireless LAN

Basically, in your /etc/hostname.if file (if being replaced by the interface name like iwm0, athn0 etc...), list every access point you know and their according password.

```configuration sample
join android_hotspot wpakey t00345Y4Y0U
join my-home wpakey goodbyekitty
join friends1 wpakey ilikeb33r5
join favorite-bar-hotspot
```

This will make the wifi interface to try to connect to the first declared network in the file if multiples access points are available.  You can temporarily remove a hotspot from the list using "ifconfig iwm0 -join android_hotspot" if you don't want to connect to it.