zotob - blocking tcp/445

Mon Aug 15 21:29:25 UTC 2005

On Mon, 15 Aug 2005, surfer at mauigateway.com wrote:

>
>
> NetBIOS was never meant to be a WAN protocol, so no problem
> in blocking it.

rule #1: do not be the Internet's Firewall
rule #2: see rule #1

a leaf network can make any decisions they want on traffic filtering,
large ISP's should probably not do this as there are invariably people out
there that will want SNMP/ICMP/NetBIOS/SQL-NameService to work over their
WAN link(S).  I recall some 'fun' with this issue on:

1) slammer worm (ms has a developers thingy that REQUIRES 1434 to work
over the internet)
2) welchia/nachi - how can I ping monitor my remote sites?

ymmv.

>
> For example:  grc.com/su-techzone1.htm
>
> scott
>
> ----- Original Message Follows -----
> From: Gadi Evron <ge at linuxbox.org>
> To: nanog list <nanog at merit.edu>
> Subject: zotob - blocking tcp/445
> Date: Mon, 15 Aug 2005 21:51:43 +0200
> > I heard from several different big ISP's that to stop the
> > spread of the  worm they now block tcp/445. I suppose it
> > works.
> >
> >     Gadi.
>