How Is This Possible?

Buadhai

macrumors regular
Original poster
Jan 15, 2018
126
48
Korat, Thailand
The Network control panel tells me that this machine has a self assigned IP address and will not be able to connect to the Internet. However, I'm logged on to it via Chrome Remote Desktop. So, obviously it can connect to the Internet. It is WiFi only; no Ethernet cable. And, there's this:

selfassigned.jpg
 

reukiodo

macrumors regular
Nov 22, 2013
242
100
Earth
Self-assigned doesn't mean not routable. Your client mac (whatever you are remotely accessing from) could be able to discover that mac over ethernet using bonjour, which IIRC, uses lower level ARP packets to discover hosts, and does not require IP to be set up correctly. Once the ARP is discovered, it is relatively simple for the client OS to map the non-routable IP to the actual hardware MAC address of the serving Mac, allowing IP connections to establish.
 

Buadhai

macrumors regular
Original poster
Jan 15, 2018
126
48
Korat, Thailand
Sorry, for not making myself clearer. The IP address 172.16.0.56 is a private IP address that was assigned by the DHCP server on my AirPort Extreme. I've never seen such an address called a "self-assigned IP address". And, the language "will not be able to connect to the Internet" is somewhat baffling since the machine is obviously connected to the Internet.

I am able to connect to the machine, which is behind a double NAT, via a reverse SSH tunnel:

Code:
MrMuscle:~ mnewman$ ssh -p [nnnnn] mnewman@localhost
Last login: Mon Jul  8 05:51:02 2019 from 172.16.0.56
So, why does the OS say that this is a self-assigned IP address when it was assigned by a DHCP server and why does the OS say that the machine will not be able to connect to the Internet?
 

Buadhai

macrumors regular
Original poster
Jan 15, 2018
126
48
Korat, Thailand
Try removing then recreating the wifi interface.
I tried turning WiFi off and on and that changed nothing.

My wife's MBA is connected to the same network with the IP address of 172.16.0.55. All it says is that WiFi is connected. Nothing about a self-assigned IP address or being unable to connect to the Internet.

I reset the SMC on my MBA, but the odd message is still there.
 

556fmjoe

macrumors 68000
Apr 19, 2014
1,609
911
That message should only appear if you have an APIPA address. Maybe your initial DHCP query failed and you got an APIPA address, but then it tried again and succeeded without clearing the message, probably due to a bug somewhere. Just guessing here.
 

satcomer

macrumors 603
Feb 19, 2008
6,301
931
The Finger Lakes Region
I tried turning WiFi off and on and that changed nothing.

My wife's MBA is connected to the same network with the IP address of 172.16.0.55. All it says is that WiFi is connected. Nothing about a self-assigned IP address or being unable to connect to the Internet.

I reset the SMC on my MBA, but the odd message is still there.
Then Reset NVRAM or PRAM on your Mac! See if that helps!