What is this?

[Simeon Johnston <simeonuj () eetc com>]

We have been getting this in our snort logs for some time now and I am
wondering exactly what it is.  I searched for it on security focus and
they say is that it is part of some ddos packages.  It has been going to
our firewall and to another machine in our DMZ.  These are the only
machines that were hit.  Is there any danger from this?  Is there a way
to tell what port it is on?  Is this a snort configuration problem?  Any
known vulnerabilities?
I am running RedHat 6.2 on the firewall w/ IPChains.

IDS193/ddos-stacheldraht server-spoof: (sender hear) -> (receiver here)