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Old 07-24-2009, 04:47 PM   #1
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Unexplained download

On my new Gentoo installation I have noticed unexplained download, that wasn't initialize from my part. After using ntop I gain two IP addresses responsible for this. One, which according to whois belong to IANA, is sending some data and second is recieving this data. I am not sure about the purpose of this. It happens every day and download about 100MB. In my home network, I have just two PCs with private addresses and and one rooter. Can anybody explain me purpose of this download? Is it security problem or not?

Sorry for bad english.

Last edited by soptik; 07-24-2009 at 05:09 PM.
Old 07-25-2009, 12:16 AM   #2
Registered: Sep 2007
Location: Las Vegas, NV
Distribution: Fedora / CentOS
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This is multicast traffic you're seeing on your external network(ISP). It's nothing to worry about.

To be extra safe, you should ingress and egress filtering setup so that your firewall blocks outbound traffic to non-routable IP addresses (such as 10.0.0./8) and incress filtering to block inbound traffic from non-routable ip addresses.


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