Multiple static IPs for different wi-fi connections on Linux. Is it possible?

Networking
21

yes, and maybe even remove the static content from dhcpcd.conf.

you could run a cronjob that looks what address it has been assigned and then let the script re-assign depending on the current network.

but why would you want to do something using an additional script that the system could do by design?

22

Yes, I was referring to the ability to custom configure your DHCP server on Android. Can you do that without a rooted phone and custom app? That was what I meant, I'd be curious to learn if you can do such granular configuration without a custom app/rooted phone.

This is great, this seems like exactly what MetalizeYourBrain actually needs.

The fact that there are two different subnets involved does not matter at all, since I see you are slightly confused about that.

The part that your missing in your Interfaces configuration file is this:

iface home inet static
address 192.168.0.X
gateway 192.168.0.X
netmask 255.255.255.0

iface phone inet static
address 192.168.1.X
gateway 192.168.1.X
netmask 255.255.255.0

Try putting that in with the correct fourth octet and see if it works.

23

I followed the guide but it didn't work. The RP as been put on the network with an arbitrary IP.

24

have you also removed the dhcpcd.conf 's wlan0 part ?
(add your config alternatively)

25

Sure! Else I would've had a conflict I guess.

26

I am somewhat confused. So what IP does your raspberry get now. what AP is it connected to, and what does your config say

27

The RP is now connected to the home wifi and instead of the 192.168.0.15 I said it to take is on 192.168.0.13.

Interfaces

# interfaces(5) file used by ifup(8) and ifdown(8)

# Please note that this file is written to be used with dhcpcd
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'

# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

auto lo
iface lo inet loopback

iface eth0 inet manual

allow-hotplug wlan0
iface wlan0 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

allow-hotplug wlan1
iface wlan1 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

iface home inet static
address 192.168.0.15
gateway 192.168.0.1
netmask 255.255.255.0

iface phone inet static
address 192.168.43.15
gateway 192.168.43.1
netmask 255.255.255.0

DHCPCD

# A sample configuration for dhcpcd.
# See dhcpcd.conf(5) for details.

# Allow users of this group to interact with dhcpcd via the control socket.
#controlgroup wheel

# Inform the DHCP server of our hostname for DDNS.
hostname

# Use the hardware address of the interface for the Client ID.
clientid
# or
# Use the same DUID + IAID as set in DHCPv6 for DHCPv4 ClientID as per RFC4361.
#duid

# Persist interface configuration when dhcpcd exits.
persistent

# Rapid commit support.
# Safe to enable by default because it requires the equivalent option set
# on the server to actually work.
option rapid_commit

# A list of options to request from the DHCP server.
option domain_name_servers, domain_name, domain_search, host_name
option classless_static_routes
# Most distributions have NTP support.
option ntp_servers
# Respect the network MTU.
# Some interface drivers reset when changing the MTU so disabled by default.
#option interface_mtu

# A ServerID is required by RFC2131.
require dhcp_server_identifier

# Generate Stable Private IPv6 Addresses instead of hardware based ones
slaac private

# A hook script is provided to lookup the hostname if not set by the DHCP
# server, but it should not be run by default.
nohook lookup-hostname

interface eth0
static ip_address=192.168.0.16/24
static routers=192.168.0.1
static domain_name_servers=192.168.0.1

I left the ethernet static IP settings because I thought it has nothing to do with wi-fi so I should not have any problem with that setting being there.

P.S. someone having the same problem and didn't manage to solve.

28

I see you have 2 wlan interfaces, still should work.
insted of wpa-conf the answer has wpa-roam to point to the wpa_supplicant.conf
are there any other configs in /etc/network/interfaces.d ?

also this kinda bugs me a little:

# Persist interface configuration when dhcpcd exits.
persistent

i hope you did restart after changing configs (or maybe only ifdown ~ ifup )

29

I did a restart and don't ask me why I have two wlans because I don't know and has been like that since the first I've booted into this installation of Raspbian. No additional settings, I just copied you the entire readout.
I can't do ifdown and ifup because I'm through SSH so I went for a reboot.