Re: Snort read a incremental file

[Paul Li <paul () scybersecurity com>]

Looking for a way that Snort monitors multiple servers but don't want to
install sensors on these servers. So try to use tcpdump sniffing  the
network on these servers and send the data to a central server where Snort
is deployed. First thought is to write file(I.e. as Felix advice using
named pipe) but realize it works for monitoring one server, but may not
multiple servers.... is there a possible way do that? How about set up a
virtual network interfac on the snort server and let tcpdump write data
from those targeting servers to that remote virtual interface on the snort
server?

Thanks,
Paul

On Monday, January 30, 2017, Joel Esler (jesler) <jesler () cisco com> wrote:

> Is there a particular reason that you are doing it this way, or can you
> just read directly from the network interface?
>
> *--*
> *Joel Esler *| *Talos:* Manager | jesler () cisco com
> <javascript:_e(%7B%7D,'cvml','jesler () cisco com');>
>
>
>
>
>
>
> On Jan 30, 2017, at 10:42 AM, Paul Li <paul () scybersecurity com
> <javascript:_e(%7B%7D,'cvml','paul () scybersecurity com');>> wrote:
>
> Thanks Felix. That works well for my issue. Much appreciated.
>
> A follow up question: if I have a multiple pipes like this one, would
> there be any order how snort reads them?
>
> Thanks,
> Paul
>
> On Saturday, January 28, 2017, Felix Erlacher <felix.erlacher () uibk ac at
> <javascript:_e(%7B%7D,'cvml','felix.erlacher () uibk ac at');>> wrote:
>
> > Hi Paul,
> >
> > On a decent OS you can write pcap data to a named pipe and make snort
> > read form that named pipe. That might be a solution in your case.
> >
> > Example on Debian:
> > #mkfifo mypipe
> > than make your program write data to that file, and with snort simply
> > #snort -c snort.conf -r ./mypipe
> >
> > greets
> >
> > felix
> >
> > On 28/01/17 14:52, Paul Li wrote:
> > > I've got a pcap file that keep adding new network data. I know Snort can
> > > read a file, but is there a way Snort can read the continuously added
> > > data to the file?
> > >
> > > Thanks,
> > > Paul
> > >
> > >
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> > --
> > Felix Erlacher
> > ccs-labs.org/~erlacher
> >
> > Key-ID:4EAC0959
> >
> >
> >
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