[Snort-users] Remote syslogging with multiple interfaces

John Hally JHally at ...5637...
Tue Aug 9 16:25:48 EDT 2005

The traffic will only go out the 'sniff' interface if you have an ip address
assigned to it (don't need to) and it's the first address in the routing
table (netstat -rn) or that interface is addressed with the same network as
the syslog server (ie 192.168.40.x)

My advice is to just start the sniff interface without an ip address:

/sbin/ifconfig eth1 up promisc

If syslog is still not picking up the entries, this is not the problem.  Is
syslog configured to accept other hosts?  I don't think it is by default
(redhat anyway)


-----Original Message-----
From: snort-users-admin at lists.sourceforge.net
[mailto:snort-users-admin at lists.sourceforge.net] On Behalf Of Kevin Ponds
Sent: Monday, August 08, 2005 2:51 PM
To: snort-users at lists.sourceforge.net
Subject: [Snort-users] Remote syslogging with multiple interfaces

Hi all,

I have two interfaces on my sensors - a dedicated sniffing interface
and a dedicated management interface.  The sniffing interfaces cannot
talk on the network.

I'd like to send syslog events to a remote management machine. 
However, snort is running on the sniff interface (eth1), and I believe
it's trying to send the syslog stuff out that interface.  This doesn't
work.   Is there any way to get snort to sniff on one interface and
send syslog events on another?

I'm using:

output alert_syslog: host=, LOG_AUTH LOG_ALERT

in snort.conf rather than using -s on the command line ( -s wouldn't
allow me to run snort since the interface didn't have an IP).

I would imagine that this would just work without having to mess
around with interfaces, but I am not seeing any events on my
management box or out of tcpdump -i eth1 on the snort sensor.



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