Subj : Re: Static IPs on Debian 9 (Stretch)
To   : Vk3jed
From : Dan Clough
Date : Sun May 26 2019 08:22 am

-=> Vk3jed wrote to All <=-

 Vk> I have a Debian 9 netbook here.  Because I have an unusual setup
 Vk> here, I need to use manual IP address configuration.  I used the
 Vk> default network manager to setup the static IPv4 and IPv6
 Vk> addresses on the wifi interface.  When I start the system, all
 Vk> works fine, and the correct IPs and routing information as I
 Vk> setup via the GUI are in place.

 Vk> However, when there's a network upset (most probably due to the
 Vk> router rebooting, or some other wifi disturbance), the static IPs
 Vk> are gone and are replaced by a DHCP assigned IPv4 address.  This
 Vk> causes a number of issues, breaking connectivity with the BBS
 Vk> that is running on the system.

 Vk> In the good old days, I'd have done a total manual configuration,
 Vk> and this would have stuck, but I decided to use the tools
 Vk> provided for 2 reasons:

 Vk> 1.  To work with the new ways of doing things, rather than
 Vk> figting the system.

 Vk> 2.  To simplify the configuration of the wifi (i.e. not having to
 Vk> mess around with wpa-supplicant directly).

 Vk> Anyone seen this behaviour?  And better still, anyone have a
 Vk> solution?

I'm not a Debian expert, but I do use a couple of Raspberry Pi's 
running Raspbian (which is basically Debian Stretch).  What has 
always worked fine for me is to edit /etc/dhcpcd.conf and just add 
the following block on to the end of the file:

interface wlan0
static ip_address=192.168.1.99/24
static routers=192.168.1.1
static domain_name_servers=192.168.1.1

That's it.  Obviously adjust IP's and maybe the interface name to 
suit.

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