On Sat, Jan 31, 2009 at 7:59 PM, seth vidal <skvidal(a)fedoraproject.org> wrote:
On Sat, 2009-01-31 at 21:30 -0600, Mike McGrath wrote:
> On Sat, 31 Jan 2009, Frank Chiulli wrote:
>
> > So I've implemented the CSI (Security Policy) as previously posted by Mike
> >
(
http://infrastructure.fedoraproject.org/csi/security-policy/en-US/html-si...)
> >
> > Now I'm seeing the following messages in /var/log/messages:
> > Jan 31 19:09:21 localhost kernel: FW-REJECT IN=eth0 OUT=
> > MAC=ff:ff:ff:ff:ff:ff:00:16:01:41:10:5b:08:00 SRC=192.168.2.248
> > DST=192.168.2.255 LEN=78 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP
> > SPT=137 DPT=137 LEN=58
> >
> > Jan 31 19:09:21 localhost kernel: FW-REJECT IN=eth0 OUT=
> > MAC=ff:ff:ff:ff:ff:ff:00:0e:3b:02:0e:b7:08:00 SRC=192.168.2.250
> > DST=192.168.2.255 LEN=229 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP
> > SPT=138 DPT=138 LEN=209
> >
> >
> > 192.168.2.248 is a NAS device
> > 192.168.2.250 is a Hawking print server
> >
> > I'm not an iptables expert. Usually I just leave it alone. Can
> > someone help me write one or more rules to eliminate the messages?
> >
>
> I suspect that before you were blocking these messages but didn't notice.
> You'll see the "DPT=137" and "DPT=138". Those are both ports
that the
> various IP's are trying to hit on your machine. If you check out those
> ports in /etc/services
>
> In this case those devices seem to be using netbios. If you want to get
> rid of them you can just remove the:
>
> -A INPUT -j LOG --log-prefix "FW-REJECT "
>
> Or setup netbios, or block the ports explicitly or allow it and let them
> drop naturally.
Those are windows/samba/cifs ports. if you've got samba running and/or a
windows (or now-adays even a mac) running on the same network you'll
probably find your culprit.
-sv
I'm not running samba. If I put the following rule before the LOG
rule, will the packets be dropped and the messages stopped?
-A INPUT -p udp -s 192.168.0.0/24 -d 192.168.0.0/24 -m multiport
--ports 137,138 -j DROP
Frank