mjhjmtu

I'm following this guide: Setting up a Raspberry Pi as an access point in a standalone network (NAT) to create an access point. The only difference is that I'm using another wifi connection where the ethernet connection would be, so I just changed eth0 by wlan1 in the entire tutorial, because wlan1 is my USB dongle which is connect to my router.

However, there's nothing being said about the /etc/network/interfaces file. Here's mine:

auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
#wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

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

I can see the SSID and connect to it, but it keeps obtaining IP address forever. I think it has something to do with /etc/network/interfaces. Take a look at my ifconfig:

pi@raspberrypi:~ $ ifconfig 
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
 inet 127.0.0.1 netmask 255.0.0.0
 inet6 ::1 prefixlen 128 scopeid 0x10<host>
 loop txqueuelen 1000 (Local Loopback)
 RX packets 4 bytes 156 (156.0 B)
 RX errors 0 dropped 0 overruns 0 frame 0
 TX packets 4 bytes 156 (156.0 B)
 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
 inet 192.168.25.6 netmask 255.255.255.0 broadcast 192.168.25.255
 inet6 fe80::ba27:ebff:feaa:1f8 prefixlen 64 scopeid 0x20<link>
 ether b8:27:eb:aa:01:f8 txqueuelen 1000 (Ethernet)
 RX packets 42 bytes 5757 (5.6 KiB)
 RX errors 0 dropped 0 overruns 0 frame 0
 TX packets 37 bytes 5838 (5.7 KiB)
 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

wlan1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
 inet 192.168.25.6 netmask 255.255.255.0 broadcast 192.168.25.255
 inet6 2804:7f0:e181:b678:2e0:4dff:fe06:4f8 prefixlen 64 scopeid 0x0<global>
 inet6 fe80::2e0:4dff:fe06:4f8 prefixlen 64 scopeid 0x20<link>
 ether 00:e0:4d:06:04:f8 txqueuelen 1000 (Ethernet)
 RX packets 86 bytes 11978 (11.6 KiB)
 RX errors 0 dropped 0 overruns 0 frame 0
 TX packets 86 bytes 15855 (15.4 KiB)
 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

How can wlan0 have IP 192.168.25.6? This is the IP given by the router in which wlan1 connects.

How should I edit wlan0 configurations? I've been trying lots of static configurations but when I do anything different that what's on screen, the onboard wifi interface vanishes and then the USB dongle takes the place of wlan0.

Also, is there a way to guarantee that the usb dongle will always get wlan1 and the onboard wifi wlan0? It seems arbitrary.

UPDATE

● dhcpcd.service - dhcpcd on all interfaces
 Loaded: loaded (/lib/systemd/system/dhcpcd.service; enabled; vendor preset: enabled)
 Drop-In: /etc/systemd/system/dhcpcd.service.d
 └─wait.conf
 Active: failed (Result: exit-code) since Sun 2018-08-05 04:54:32 UTC; 7s ago
 Process: 853 ExecStart=/usr/lib/dhcpcd5/dhcpcd -q -w (code=exited, status=6)

Aug 05 04:54:32 raspberrypi systemd[1]: Starting dhcpcd on all interfaces...
Aug 05 04:54:32 raspberrypi dhcpcd[853]: Not running dhcpcd because /etc/network/interfaces
Aug 05 04:54:32 raspberrypi dhcpcd[853]: defines some interfaces that will use a
Aug 05 04:54:32 raspberrypi dhcpcd[853]: DHCP client or static address
Aug 05 04:54:32 raspberrypi systemd[1]: dhcpcd.service: Control process exited, code=exited status=6
Aug 05 04:54:32 raspberrypi systemd[1]: Failed to start dhcpcd on all interfaces.
Aug 05 04:54:32 raspberrypi systemd[1]: dhcpcd.service: Unit entered failed state.
Aug 05 04:54:32 raspberrypi systemd[1]: dhcpcd.service: Failed with result 'exit-code'.

If wlan0 is going to be the access point (AP), then you shouldn't attempt to use it as a client (station, STA). But this is what

auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
#wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

says: "Please use wlan0 as in client-mode, and get an IP address for it using DHCP". Instead, you want something like

auto wlan0
iface wlan0 inet static
address 10.0.0.1
netmask 255.255.255.0
broadcast 10.0.0.255

Replace 10.0.0.* and netmask with the IP range you want to have for your AP.