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  1. #1
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    Attack 'Originated on Local Network'?

    Occasionally Norton Firewall tells me it has blocked an attack. I ask for more details, and it tells me, "The IP address...belongs to a computer on your local network, therefore there is no public network or domain information." What does this mean? (BTW the previous message was, "A computer...sent information that is characteristic of the 'Welchia_ICMP_Scan' attack.")

  2. #2
    Plutonium Lounger
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    Re: Attack 'Originated on Local Network'?

    Do you have more than one PC connected to a router or hub? If so then it is likely that one of them has a virus - not the one where the message appears but one of the others.

    StuartR

  3. #3
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    Re: Attack 'Originated on Local Network'?

    I forgot to point out that I have a standalone PC and it is not on a router. If I actually had a network, this sort of message would be perfectly understandable.

  4. #4
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    Re: Attack 'Originated on Local Network'?

    Is the IP address your PC? Does this happen during normal usage? Or at boot time?

    Joe
    Joe

  5. #5
    Super Moderator jscher2000's Avatar
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    Re: Attack 'Originated on Local Network'?

    Your computer is part of a network defined by your ISP. If you have Windows 2000 or XP, you can check your settings using a command window (if you have Windows 98 or ME, you can use Start>Run>winipcfg instead):

    Start > Run... > cmd

    ipconfig/all

    This should list the following clues:

    IP Address: (something "public" like 66.99.1.100)
    Subnet mask: (something like 255.255.0.0)

    A subnet mask defines the range of IP addresses that are on "your" network. In the above example, that's 66.99.0.1 to 66.99.254.254, or approximately 64,500 other addresses, each of which can provide a public access point for any number of computers. Welcome to the neighborhood!

    If possible, you should tell Norton Personal Firewall that you are the only one on your local network, or that there is no local network and everything other than your computer is the Internet, and not to be trusted. As I've never used NPF, I'm not sure how you do that.

  6. #6
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    Re: Attack 'Originated on Local Network'?

    If you connect to the internet by cable or DSL then yes you are on a "local network".

    Now running HP Pavilion a6528p, with Win7 64 Bit OS.

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