/etc/network/interfaces with multiple network interfaces

[Rainer Dorsch <ml@bokomoko.de>]

Hi,

I have a system with two network interfaces, connecting to two subnets. 

For some reason the default route is going through eth0.3, I would want to 
have it through eth0.7.

Is the default route determined by the order in /etc/network/interface of the 
interfaces or is there another algorithm behind?

rd@master:~$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

auto eno1
allow-hotplug eno1
#iface eno1 inet dhcp
iface eno1 inet6 auto
  accept_ra 0

# cam
auto eno1.3
allow-hotplug eno1.3
iface eno1.3 inet dhcp
iface eno1.3 inet6 auto
  accept_ra 0

# data
auto eno1.7
allow-hotplug eno1.7
iface eno1.7 inet dhcp
iface eno1.7 inet6 auto
  accept_ra 0
rd@master:~$ ip a show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP 
group default qlen 1000
    link/ether 18:66:da:20:6f:2d brd ff:ff:ff:ff:ff:ff
    inet6 fe80::1a66:daff:fe20:6f2d/64 scope link 
       valid_lft forever preferred_lft forever
3: eno1.3@eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state 
UP group default qlen 1000
    link/ether 18:66:da:20:6f:2d brd ff:ff:ff:ff:ff:ff
    inet 192.168.3.2/24 brd 192.168.3.255 scope global eno1.3
       valid_lft forever preferred_lft forever
    inet6 fe80::1a66:daff:fe20:6f2d/64 scope link 
       valid_lft forever preferred_lft forever
4: eno1.7@eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state 
UP group default qlen 1000
    link/ether 18:66:da:20:6f:2d brd ff:ff:ff:ff:ff:ff
    inet 192.168.7.2/24 brd 192.168.7.255 scope global eno1.7
       valid_lft forever preferred_lft forever
    inet6 fe80::1a66:daff:fe20:6f2d/64 scope link 
       valid_lft forever preferred_lft forever
rd@master:~$ ip r
default via 192.168.3.1 dev eno1.3 
192.168.3.0/24 dev eno1.3 proto kernel scope link src 192.168.3.2 
192.168.7.0/24 dev eno1.7 proto kernel scope link src 192.168.7.2 
rd@master:~$ 


Thanks
Rainer
-- 
Rainer Dorsch
http://bokomoko.de/