MTU is not displayed correctly

[niusmallnan]

RancherOS Version: v1.1.1

Where are you running RancherOS? GCE/AWS

Boot a new VM on GCE, and check the interfaces info:

rancher@ros-test-4 ~]$ ip a
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: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 42:01:0a:f0:00:08 brd ff:ff:ff:ff:ff:ff
    inet 10.240.0.8/32 brd 10.240.0.8 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::4001:aff:fef0:8/64 scope link
       valid_lft forever preferred_lft forever

For eth0, Its MTU is determined by DHCP(should be 1460), check the ip route:

default via 10.240.0.1 dev eth0 src 10.240.0.3 metric 202  mtu 1460
10.240.0.1 dev eth0 proto kernel scope link src 10.240.0.3 metric 202  mtu 1460
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown
172.18.0.0/16 dev docker-sys proto kernel scope link src 172.18.42.2 linkdown

MTU is not displayed correctly.

link #2027

[kingsd041]

Tested with rancheros v1.2.0-rc2 in AWS/GCE,
For eth0, MTU is 1460