multiple interface with dhcp result into wrong metric and gateway
I have 2 network interfaces, both are using DHCP, eth0 is for internet, and eth1 is for lan only.
From the wiki: https://wiki.alpinelinux.org/wiki/Multi\_ISP
The DHCP client will automatically add a metric value to the default
gateway. It will pick 200 + interface index. Therefore we don’t need to
worry about that for DHCP.
But, ifconfig shows metric are both 1, so every time I reboot my system,
I have no internet.
The system will pick up the latest up interface as the default
gateway.
It is randomly unexpectable.
localhost:~# cat /etc/network/interfaces
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
auto eth1
iface eth1 inet dhcp
localhost:~# netstat -nre
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.0.2.1 0.0.0.0 UG 202 0 0 eth0
10.0.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
192.168.56.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
localhost:~# ifconfig
eth0 Link encap:Ethernet HWaddr 08:00:27:7B:1A:80
inet addr:10.0.2.4 Bcast:0.0.0.0 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe7b:1a80/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2 errors:0 dropped:0 overruns:0 frame:0
TX packets:14 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1180 (1.1 KiB) TX bytes:1612 (1.5 KiB)
eth1 Link encap:Ethernet HWaddr 08:00:27:19:32:A2
inet addr:192.168.56.150 Bcast:0.0.0.0 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe19:32a2/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:203 errors:0 dropped:0 overruns:0 frame:0
TX packets:133 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:22257 (21.7 KiB) TX bytes:30775 (30.0 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:40 errors:0 dropped:0 overruns:0 frame:0
TX packets:40 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:2880 (2.8 KiB) TX bytes:2880 (2.8 KiB)
(from redmine: issue id 8668, created on 2018-03-19)