Re: error in messages: sent an invalid ICMP error to a broadcast

I have also been getting copious messages of this kind.  I have a 6.1 box 
acting as a NAT/firewall behind a cable modem.  I would be interested in 
any suggestions on the probable cause....
At 10:23 AM 8/18/2003 -0400, [email protected] wrote:
>Getting this repeating message in the messages log. Any ideas what could be
>causing it.
>
>Aug 18 10:05:35 btsdea01 kernel: 172.19.5.103 sent an invalid ICMP error to
>a broadcast.
>Aug 18 10:05:35 btsdea01 kernel: 172.19.5.104 sent an invalid ICMP error to
>a broadcast.
>Aug 18 10:10:32 btsdea01 kernel: 172.19.5.104 sent an invalid ICMP error to
>a broadcast.
>Aug 18 10:10:32 btsdea01 kernel: 172.19.5.103 sent an invalid ICMP error to
>a broadcast.
>Aug 18 10:15:08 btsdea01 kernel: 172.19.5.104 sent an invalid ICMP error to
>a broadcast.
>Aug 18 10:15:08 btsdea01 kernel: 172.19.5.103 sent an invalid ICMP error to
>a broadcast.
>Aug 18 10:15:32 btsdea01 kernel: 172.19.5.103 sent an invalid ICMP error to
>a broadcast.
>Aug 18 10:15:32 btsdea01 kernel: 172.19.5.104 sent an invalid ICMP error to
>a broadcast.
>
>Pat Spatola
>Unix Administrator
>Berkley Technology Services
>302-439-2006
>[email protected]
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John Ketchum
Qualcomm Inc.
9 Damonmill Square Suite 2A
Concord, MA 01742