Solved - Re: Figuring out a headless server's zeroconf addr

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Kind of.

No zeroconf.  For some reason.  But at least ipv6 local-scope.

Used wireshark to capture dhcp probes to get MAC address.

Converted MAC address into IPv6 local scope address.

ssh ipv6%interface

and I am in!

Now to later do this later to the actual box rather than between two notebooks. But it should work the same!

On 07/21/2014 12:34 PM, Robert Moskowitz wrote:

On 07/21/2014 11:25 AM, Tim wrote:
On Mon, 2014-07-21 at 10:55 -0400, Robert Moskowitz wrote:
I have a headless system that I cannot connect to.  So I was thinking
to put a direct connection to it and my notebook.  Both ethernets
would use the zeroconf (169.254.0.0/16) addresses.  I could then use
fping
  fping -g 169.254.0.0/16
  And SHOULD be able to get its address, and then SSH into the box.
I was under the impression that zeroconf did some rudimentary name
resolution, and you ought to be able to connect to hostname.local
(replacing "hostname" with the actual hostname).

It'd be a bit dopey if a zero-configuration scheme required you to
configure things...

I am doing a little testing, and zeroconf does not seem to be working. I am seeing the link up light on my ethernet port. I am seeing a local-scope v6 address, but no v4 address:

p6p1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::ea9a:8fff:fe8d:7b56  prefixlen 64  scopeid 0x20<link>
        ether e8:9a:8f:8d:7b:56  txqueuelen 1000  (Ethernet)
        RX packets 7  bytes 2130 (2.0 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 46  bytes 4948 (4.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Note that it is receiving packets from the other system. It also has a local-scope ipv6 addr, but no zeroconf addr (both systems are Fedora 20).

So how do I start zeroconf? Of course on the other system, I can't do that...

So given ipv6 local-scope, how do I learn the other system's addr. Trying to figure out fping6. How do I restrict it to the desired interface?


Any other thoughts?  I can't get to the box to recable it and reboot
it (as that is the only way I can figure out for it to readdress eth0)
until this evening.
Only that:  Are you on the same network?  169.254 connections can't be
expected to be reachable outside of their own net.

Crossover cable.  Is that enough of a 'same network'?  :)

And I have considerable routing and addressing knowledge. Besides being one of the authors of rfc 1918, and worked on CIDR, here at IETF I contribute to ipv6ops and ipv6man.



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