two default routes on pi zero W

[dave r]

Hi Chris, wondering if you might be able to help...

cluster hat:  v2.3

controller:  RPi B 3+

clients: all four are Pi Zero W v1.1

software: 2018-06-27-controller (not the NAT version)

I use a wpa_supplicant.conf on the Pi Zero W.

When I boot a Pi Zero W, it ends up with two default routes:

pi@p1:~ $ route

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

default         172.19.181.254  0.0.0.0         UG    202    0        0 usb0

default         10.0.1.1        0.0.0.0         UG    303    0        0 wlan0

10.0.1.0        0.0.0.0         255.255.255.0   U     303    0        0 wlan0

172.19.181.0    0.0.0.0         255.255.255.0   U     202    0        0 usb0

If I delete the default route via 172.19.181.254/usb0, then I can reach the internet ok.

But after reboot this route re-appears and I'm no longer able to reach internet.

I think my question is...

How do I stop the default route from being re-instated during reboots?

Thanks again.

Dave.

[Chris Burton]

Hi, 

I think my question is...

How do I stop the default route from being re-instated during reboots?

Probably a better thing to do is to keep the two default routes but give the default route on wlan0 a higher priority (lower metric).

To do that put this in your /etc/dhcpcd.conf file and restart the Pi Zero(s) it should then prefer to send traffic out over wlan0 and fallback to usb0 if wlan0 isn't up.

interface wlan0
metric 100

Chris.

[dave r]

That worked.  Thank you Chris.