[SFS] Ubuntu server with 2 IP addresses

[Corey]

Hopefully this message will get to everybody, I think I sent it to the
right address . . . if not would somebody forward it to the brain
trust for me?

Thanks in advance for any advice and or sarcasm offered ;-)

I have an issue with an Ubuntu server that I just upgraded from 14.04
to 16.04 using the do-release-upgrade command. I know it is not ideal,
but this was preferred over a clean install. Everything seemed to go
well, but now eth0 has 2 IP addresses, 1 dynamic (I don't need or
want) and 1 static, which is the actual one that I want. They are both
working fine and I can SSH to the server on either address. How can I
turn off the 1 dynamic address?

Here is my interfaces file:

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
        address 10.0.1.211
        netmask 255.255.255.0
        network 10.0.1.0
        broadcast 10.0.1.255
        gateway 10.0.1.254
        dns-nameservers 10.0.1.2 10.0.1.22

Here is the result of "ip a", notice it shows both addresses, but
"ifconfig" that follows it only shows the dynamic one:

srv:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
group default
    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 mq state UP
group default qlen 1000
    link/ether 00:50:56:85:7a:60 brd ff:ff:ff:ff:ff:ff
    inet 10.0.1.64/24 brd 10.0.1.255 scope global dynamic eth0
       valid_lft 258240sec preferred_lft 258240sec
    inet 10.0.1.211/24 brd 10.0.1.255 scope global secondary eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:fe85:7a60/64 scope link
       valid_lft forever preferred_lft forever


srv:~$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:50:56:85:7a:60
          inet addr:10.0.1.64  Bcast:10.0.1.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:fe85:7a60/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4454 errors:0 dropped:0 overruns:0 frame:0
          TX packets:348 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:415570 (415.5 KB)  TX bytes:63700 (63.7 KB)

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:333 errors:0 dropped:0 overruns:0 frame:0
          TX packets:333 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:55712 (55.7 KB)  TX bytes:55712 (55.7 KB)