Wireless network sharing: how on Ubuntu 13.04?

[scruss]

I used to be able to share my Mac's wireless connection from the ethernet port to my Raspberry Pi. Now I have a new Linux (Ubuntu 13.04) laptop, and I can't get very far. If I set up the wired connection with IPv4 ‘Shared with other computers’, the wireless seems to go off on my laptop when I plug the Raspberry Pi into the ether net port.

Any suggestions, please?

[sprinkmeier]

the wireless seems to go off is a bit vague.

what is the output of

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$ ip route

and

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$ ifconfig 

on the PC and RasPi before and after you plug in the RasPi?

[scruss]

the wireless seems to go off is a bit vague.

It used to disconnect completely. Anyway, it doesn't do it any more.

What you have to do is Edit Connections… → select Ethernet: Wired Connection 1 (or whatever it's called), Edit… → IPv4 Settings → Method: Shared to other computers. Your Raspberry Pi will be lurking somewhere in the 10.42.0.* range, and can be found with nmap:

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sudo nmap -sn 10.42.0.0/24

Starting Nmap 6.00 ( http://nmap.org ) at 2013-05-19 09:20 EDT
Nmap scan report for 10.42.0.1
Host is up.
Nmap scan report for 10.42.0.47
Host is up (0.00049s latency).
MAC Address: B8:27:EB:F3:CD:A4 (Raspberry Pi Foundation)
Nmap done: 256 IP addresses (2 hosts up) scanned in 2.59 seconds

So my Raspberry Pi is at 10.42.0.47. You don't strictly need to use sudo with nmap, but if you do it will report the MAC address and the vendor — which is a dead giveaway.

(thanks to John Martin on the GTALUG mailing list for helping with this.)