internet connection sharing assigned IP Setting the internet connection sharing is straighforward from the OSX preferences. So I set the sharing via the ethernet cable so that when I ifconfig, I see some new entry bridge100 that is has 192.168.2.1 IP . 
Then I connected my pi via the ethernet. Now, I try to find the IP that is assigned to the PI but when I ping the subnet 192.168.2.*, I get nothing else but 192.168.2.1. However, I notice that the ethernet cable is using en5 interface but with no IP. Do I need to set a static IP to en5 ?

lo0: flags=8049&lt;UP,LOOPBACK,RUNNING,MULTICAST&gt; mtu 16384
    options=3&lt;RXCSUM,TXCSUM&gt;
    inet6 ::1 prefixlen 128 
    inet 127.0.0.1 netmask 0xff000000 
    inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 
    nd6 options=1&lt;PERFORMNUD&gt;
gif0: flags=8010&lt;POINTOPOINT,MULTICAST&gt; mtu 1280
stf0: flags=0&lt;&gt; mtu 1280
en0: flags=8863&lt;UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST&gt; mtu 1500
    ether a4:5e:60:d9:e4:51 
    inet6 fe80::a65e:60ff:fed9:e451%en0 prefixlen 64 scopeid 0x4 
    inet 192.168.43.14 netmask 0xffffff00 broadcast 192.168.43.255
    nd6 options=1&lt;PERFORMNUD&gt;
    media: autoselect
    status: active
en1: flags=8963&lt;UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST&gt; mtu 1500
    options=60&lt;TSO4,TSO6&gt;
    ether 6a:00:00:1f:0c:50 
    media: autoselect &lt;full-duplex&gt;
    status: inactive
en2: flags=8963&lt;UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST&gt; mtu 1500
    options=60&lt;TSO4,TSO6&gt;
    ether 6a:00:00:1f:0c:51 
    media: autoselect &lt;full-duplex&gt;
    status: inactive
bridge0: flags=8863&lt;UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST&gt; mtu 1500
    options=63&lt;RXCSUM,TXCSUM,TSO4,TSO6&gt;
    ether a6:5e:60:9d:1f:00 
    Configuration:
        id 0:0:0:0:0:0 priority 0 hellotime 0 fwddelay 0
        maxage 0 holdcnt 0 proto stp maxaddr 100 timeout 1200
        root id 0:0:0:0:0:0 priority 0 ifcost 0 port 0
        ipfilter disabled flags 0x2
    member: en1 flags=3&lt;LEARNING,DISCOVER&gt;
            ifmaxaddr 0 port 5 priority 0 path cost 0
    member: en2 flags=3&lt;LEARNING,DISCOVER&gt;
            ifmaxaddr 0 port 6 priority 0 path cost 0
    nd6 options=1&lt;PERFORMNUD&gt;
    media: &lt;unknown type&gt;
    status: inactive
p2p0: flags=8843&lt;UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST&gt; mtu 2304
    ether 06:5e:60:d9:e4:51 
    media: autoselect
    status: inactive
awdl0: flags=8943&lt;UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST&gt; mtu 1452
    ether d6:8c:e1:bd:55:69 
    inet6 fe80::d48c:e1ff:febd:5569%awdl0 prefixlen 64 scopeid 0x9 
    nd6 options=1&lt;PERFORMNUD&gt;
    media: autoselect
    status: active
en5: flags=8963&lt;UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST&gt; mtu 1500
    options=4&lt;VLAN_MTU&gt;
    ether 20:c9:d0:2a:ee:68 
    nd6 options=1&lt;PERFORMNUD&gt;
    media: autoselect (100baseTX &lt;full-duplex,flow-control&gt;)
    status: active
bridge100: flags=8863&lt;UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST&gt; mtu 1500
    options=3&lt;RXCSUM,TXCSUM&gt;
    ether a6:5e:60:9d:1f:64 
    inet 192.168.2.1 netmask 0xffffff00 broadcast 192.168.2.255
    inet6 fe80::a45e:60ff:fe9d:1f64%bridge100 prefixlen 64 scopeid 0xb 
    Configuration:
        id 0:0:0:0:0:0 priority 0 hellotime 0 fwddelay 0
        maxage 0 holdcnt 0 proto stp maxaddr 100 timeout 1200
        root id 0:0:0:0:0:0 priority 0 ifcost 0 port 0
        ipfilter disabled flags 0x2
    member: en5 flags=3&lt;LEARNING,DISCOVER&gt;
            ifmaxaddr 0 port 10 priority 0 path cost 0
    nd6 options=1&lt;PERFORMNUD&gt;
    media: autoselect
    status: active
Have you tried to display Internet-to-Ethernet address using the arp utility ? arp -a will display the connected devices to your network via ethernet. 

It will show something like this :
(192.168.100.104) at xx:xx:xx:xx:xx:xx on en0 ifscope [ethernet]