Blocking Virus ICMP flood

[User Ernie]

[ Charset ISO-8859-1 unsupported, converting... ]
> > From: User Ernie [mailto:ernie at spooky.eis.net.au]
> > 
> > Does anyone know if ipfw can do someting similar to:
> > 
> >  deny icmp any any echo tos min-delay
> > 
> > Which is the Cisco command I use to try and limit the flood 
> > style icmp traffic from the
> > recent Internet viruses.
> > 
> > - Ernie.
> 
> ipfw add deny icmp from any to any icmptypes 0,8  iptos lowdelay
> 
I tried that but it gives me the following error:

ipfw: unknown or out of order argument `iptos''


Does it depend on FreeBSD version? I am running 4.8-STABLE

- Ernie.