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Re: CSI (Security Policy) Help



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-singel/)
> >
> > 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



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