dhcpcd-discuss

Hi Feroslav

On 11/05/2020 18:32, Feroslav wrote:
> Hello guys, in first, thanks a lot for great linux component which met most RFC's :)

Thanks :)

> Im looking for solution where have "dhcpcd" which is started as systemd daemon, 
> with "-p -q -b wlan0" args, client is always online and there is no event which 
> may stop or restart dhcpcd. Also, client is mostly used for IPv4ll (IPv4 
> Link-local addressing, dhcpcd is optional but not mandatory, wlan0 
> wpa_supplicant is always online.
>
> But im facing with little problem, im need to keep IPv4 address on interface(and 
> on dhcpcd) when wlan0 link states are changes with "ip link set wlan0 down" -> 
> -> "ip link set wlan0 up", but during this update, dhcpcd will lost IPv4LL 
> address and dhcpcd will generate new one.
>
> |e.g. stages: 1) boot process, dhcpcd will generate 169.254.8.37 as link-local 
> ip address on wlan0 interface 2) $: ifconfig -> wlan0:addr 169.254.8.37 3) $: ip 
> link set wlan0 down 4) $: sleep 20 5) $: ip link set wlan0 up 6) $: ifconfig -> 
> wlan0: 169.254.37.137 |
>
> --persistent, --reconfigure does not help to solve situation. Any ideas how i 
> can keep dhcpcd/wlan0 interface ipaddress when down&up?

dhcpcd should retain the address, but I think I tested that on NetBSD and not Linux.

I'll try and replicate this once I can fire up a Linux VM and get back to you 
shortly.

Roy