[wellylug] Broadcast flood?

Sam Cannell sam at plaz.net.nz
Thu Feb 26 16:38:45 NZDT 2004


Nope .. All that DNS traffic is in fact being caused by the scan
running.

Most traffic monitoring tools, by default, attempt to lookup the reverse
of all IP addresses.  If you look at all the requests to
rachel.paradise.net.nz, you'll see it's attempting to resolve the PTR
record for the previous IP address in the dump.

For a more accurate traffic list, try something like:

tcpdump -ni eth1

Where eth1 is your internet interface.

The -n tells tcpdump not to attempt to resolve ip addresses to
hostnames.

On Thu, Feb 26, 2004 at 04:31:07PM +1300, Michael Dittmer wrote:
> rachel.paradise.net.nz is one of the 2 DNS servers that Paradise have.
> 
> My guess would be that something on your machine is doing DNS lookups just
> by a brief look at the log.
> 
> Regards
> 
> Michael
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