Internet sharing w/ OS X ...sorta interesting

in Genius Bar edited January 2014
Ok here is the setup - I have two machines - one hub - one cable modem.

Both machines are 10.2 and I have the cable modem plugged into the uplink of the hub - and both machines plugged into the hub - One of my machines(iMac) gets an ip from my ISP and then I turned on internet sharing and then my Powermac(2nd machine) gets an ip from the iMac - Everything works - There isnt anything I haven't been able to do yet however I am a little worried about security - am I broadcasting all my traffic onto my cable node? Could someone snag an IP off my box? I would be really interested to hear what you guys have to say.


  • Reply 1 of 2
    gargoylegargoyle Posts: 660member
    Only the machine that gets the IP from the cable modem is "viewable" from the internet. In the last 3 years, I have never had a firewall, so I am prolly not the best to comment on security.

    You can use the netstat command to view what ports your computer is listening on.
  • Reply 2 of 2
    dobbydobby Posts: 796member

    Originally posted by PeePeeSee

    am I broadcasting all my traffic onto my cable node?

    Yes but only as all network traffic is broadcast, as in a unicast, multicast, broadcast are all broadcasts.

    I assume you mean broadcast your traffic to your CMTS (Cable Modem Termination System) but DOCSIS doesn't let you snoop for traffice quite that easily.

    You do need security on a cable modem but as your not using a MS OS you don't really have to worry about the zillions of security issues.

    OS X has all services turned of by default so your machine is not going to be hacked that easily.

    You could always activate the built in firewall (for what its worth).

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