Re: Port scanning

[Subba Rao <subba9 () home com>]

On  0, Erek Adams <erek () theadamsfamily net> wrote:
> On Mon, 17 Sep 2001, Subba Rao wrote:
>
> [...snip...]
>
> > Now, I dial to the Internet using another system and run a portscan on the
> > Snort box. All I am seeing is some ICMP "Echo Reply" logged into the "alerts"
> > file. There is nothing logged into "portscan.log" while the ipchains is logging
> > each port connect attempt into syslog.
>
> [...snip...]
>
> Actually, a little research gives this answer:
>
> http://snort.sourcefire.com/docs/faq.html#4.3
>
> :)  Guess I was right!

Thanks for the pointer. I thought Snort uses libpcap for capturing the packets.
On my system (with iptables), I do log all the Internet traffic using 'tcpdump'.
Obviously 'tcpdump' is capturing packets before iptables see them.

-- 

Subba Rao
subba9 () home com                     http://members.home.net/subba9/
OpenPGP/GPG public key ID CCB7344E

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