Airport Extreme Base: Block ICMP

Discussion in 'Mac Peripherals' started by groundstrike, Mar 29, 2008.

  1. macrumors newbie

    Joined:
    Nov 9, 2006
    #1
    Alot of home router have the option to block ICMP traffic from the WAN. I can't seem to find this with the Airport Extreme Base Station. Using Gibson Research Corporation's Shields Up! I get the following messages:

    Solicited TCP Packets: RECEIVED (FAILED) — As detailed in the port report below, one or more of your system's ports actively responded to our deliberate attempts to establish a connection.​

    Ping Reply: RECEIVED (FAILED) — Your system REPLIED to our Ping (ICMP Echo) requests, making it visible on the Internet.​

    All other ports scanned came back with:

    Closed - Your computer has responded that this port exists but is currently closed to connections.​

    or

    Stealth - There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!​

    I'm no network guru, but shouldn't all port scan attempts come back as stealth? Shouldn't the router not respond to Pings on the WAN side?
     
  2. macrumors 68030

    kbmb

    Joined:
    Mar 13, 2007
    Location:
    NH
    #2
    I'm just learning that no Apple router gives the option to stealth the ports on the WAN side, or to block ICMP requests.

    Seems odd to me that Apple doesn't do this as just about every router has been doing this for ages!

    Do people not see this as an issue?

    -Kevin
     
  3. macrumors 6502

    Joined:
    Mar 10, 2007
    #3
    Apple seems more interested in enabling services via e.g. Wide Area Bonjour, than they are in making your connection invisible. One doesn't necessarily need to be invisible to be secure, you know.
     
  4. macrumors G4

    Joined:
    Jan 5, 2006
    Location:
    Redondo Beach, California
    #4
    If you don't want your router to answer pings maybe port forwarding would help. Forward the ping to some IP address that does not exist on your network. This is a guess. I give it a 50% chance
     
  5. macrumors regular

    Joined:
    Feb 14, 2008
    Location:
    Austin, TX, USA
    #5
    Blocking all ICMP can cause problems, as well. When I lived in the dorms at my college, if you blocked all ICMP packets, the resnet system would actually disable your port if you blocked them (since from its point of view, nobody was using it!)

    What's funny is that they recommended you use Symantec's firewall product on Windows, which would detect the 'are you still there?' checks as portscans and highly recommend you block them. I had to help quite a few people in whitelisting it.
     
  6. macrumors newbie

    Joined:
    Apr 27, 2008
    #6
    Dropping ping responses does not make your connection invisible. See, for example, the explanation given here.
     
  7. macrumors member

    Joined:
    May 21, 2009
    #7
    Nice
     

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