[Snort-users] -b binary capture
erek at ...577...
Fri Sep 28 10:12:02 EDT 2001
On Fri, 28 Sep 2001, Greg Sarsons wrote:
> I see that snort by default with binary dump captures 1514. Well this
> is just to much for my little 30 Gig hard drive on a busy school
> network. I'm going to do some analysis with snort after but will also
> be using tcptrace, ipfw and a few others.
> If I grab 10%, say 150 vice 1514, will I really be limiting what I can
> do after? Doesn't tcpdump by default grab 68.
You limit youself because if you don't get the full packet payload. That can
be the difference between a false postive and an actual attack.
And yes, tcpdump does grab 68. Just headers, no payload.
> The traffic bw from what I know on the network has peaked at about
> 20Mb/sec but the average seems to be 11Mb/sec. If I plug into another
> smaller subnet the traffic bw could drop even more.
Sounds about average for what you are describing.
> Again this has got to fit on a 30Gig drive. The more days that I can
> capture the better for the statistics. Filling the hard drive in only
> one day doesn't really give a nice look.
Ug... I'm assuming you're using IDE?
> Any recommendations?
Other that drop a $100 and get another drive? :-) You might consider
dumping the data off to another box for post processing every so often.
You're in kinda a tough spot... Sorry I can't be of more help.
More information about the Snort-users