I was getting strange IP Adress from my (2nd) router ad figure it out it was I change the ethernet port. Why I was getting strange IP?


I have two Routers, the 2nd a tp-link with dd-wrt. I configure it with the same SSID and other options to have one big wifi network. It worked well. But from one moment to another I was not getting internet.

At first I though I was being hacked. Then I found https://superuser.com/a/1145468/273358 And it turn out my ethernet cable was connected on a different port. Switched it, solve it.

EDIT: the strange IPs were: It was usually for the 2nd router and for my laptop.

But then I got

inet netmask 0xffff0000 broadcast 

And I made a ping:

PING ( 56 data bytes
64 bytes from icmp_seq=0 ttl=255 time=0.108 ms
64 bytes from icmp_seq=0 ttl=255 time=92.558 ms

And arp:

$ arp -a
? ( at x:x:xx:xx:xx:e9 on en7 permanent [ethernet]
? ( at x:xx:xx:xx:6f on en7 [ethernet]
? ( at x:xx:xx:xx:xx:fb on en7 ifscope permanent [ethernet]

But I want to know what happened.

asked on Super User Dec 27, 2017 by hugomosh • edited Dec 27, 2017 by hugomosh

1 Answer


What happened was that you were plugged into the wrong port and there was no DHCP server available on the network, and so your device used a self-assigned link-local IP address as defined in RFC3927.

answered on Super User Dec 27, 2017 by Mike Scott

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