mailing list archives
Re: Network Variables
From: waldo kitty <wkitty42 () windstream net>
Date: Thu, 02 May 2013 15:00:04 -0400
On 5/2/2013 13:23, Seth Dunn wrote:
So now my question comes, since you were wondering about the rule I was
This is my rule::
not net 10.10.0.0/24 and dst host 10.75.45.1&& dst port 80 or not net
10.30.0.0/24 and dst host 10.75.45.1&& dst port 80
ok, i'm going to try to break this down and interpret your wants one section at
By my understanding, and my desire to see happen is this.
Traffic from the network 10.10.0.0/24 going to http at 10.75.45.1 should
(net 10.10.0.0/24 and (host 10.75.45.1 and port 80))
Also, traffic from the network 10.30.0.0/24 going to http at 10.75.45.1
should be ignored.
(net 10.30.0.0/24 and (host 10.75.45.1 and port 80))
All other traffic is still monitored.
the above should qualify your two wants... now, let's streamline them a bit to
make it more legible...
first, let's combine the two source networks into one statement...
net (10.10.0.0/24 or 10.30.0.0/24)
now the destination host and destination port...
host 10.75.45.1 and port 80
then combine those two lines...
net (10.10.0.0/24 or 10.30.0.0/24) and host 10.75.45.1 and port 80
and lastly negate the whole thing by enclosing it in parens with 'not' on the
not (net (10.10.0.0/24 or 10.30.0.0/24) and host 10.75.45.1 and port 80)
plug that line into your bpf with the double quotes or whatever you need to wrap
around it and see what happens ;)
FWIW: this was minimally tested on my network via tcpdump and manually checking
the pcap with wireshark...
1. using 'src net' and 'dst host' plus 'dst port' resulted in only the traffic
/to/ the server being ignored but all the traffic from the server was seen...
2. removing the 'src' and 'dst' designators denotes all traffic in both
directions that fits the mask (if i can use that term to describe this object)...
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