Re: Questions after 1.9.1 install

[Erek Adams <erek () snort org>]

On Fri, 14 Mar 2003, John Sage wrote:

> Hello all. Long time no post..

Yeah, what's up with that?  You slacker!  ;-)

> Finally put 1.9.1 on after rebuilding my firewall to get into the
> 2.4.18 Linux kernel series, and have I got questions :-/
>
>
> First of all, the tcpdump logfile is timestamped in UNIX time:
>
> 901956 Mar 12 20:31 snort.log.1047528578

Normal.  Been that way since 1.8.6/7, IIRC.

> Second, this rule is firing:
>
> alert tcp $EXTERNAL_NET 1025:4320 -> $HOME_NET any (msg:"TCP inbound \
> from range 1025-4320";)
>
> but this one isn't:
>
> alert tcp $EXTERNAL_NET any -> $HOME_NET 445 (msg:"TCP inbound to 445 \
> Win2k SMB";)
>
> even though I would think that the RTN list would check a specific
> port before a port list..
>
> Here's the alert itself:
>
> [**] [1:0:0] TCP inbound from range 1025-4320 [**]
> [Priority: 0]
> 03/13/03-20:24:48.401161 209.181.67.217:3195 -> 12.82.133.46:445
> <snip>

Ok, may be a silly question, but which rule is first?  1.9.x still uses
FIFO to order the rules in the RTN list.  Swap the order for grins?

> And thirdly, I'm getting mass these sorts of things:
>
> [**] [117:1:1] (spp_portscan2) Portscan detected from 12.82.133.46:
> 6 targets 6 ports in 5 seconds [**]
> 03/13/03-20:09:52.818983 12.82.133.46:1034 -> 198.133.199.110:53
>
> which is my caching-only nameserver talking outbound to..
>
> ..a nameserver...
>
> [toot@tweedle /tmp]# host 198.133.199.110
> 110.199.133.198.in-addr.arpa domain name pointer arrowroot.arin.net.

Yep, portscan2 is a noisy lil bugger.  Either use preprocessor
portscan2-ignorehosts: 12.82.133.46 or use s BPF filter to drop that
traffic.

        src host 12.82.133.46 and dst host 198.133.199.110 and dst port 53

Should do the trick.

Cheers!

-----
Erek Adams

   "When things get weird, the weird turn pro."   H.S. Thompson


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