I have been receiving a weird error message in my logs for some time now:

        Apr  1 08:18:38 pri=3 flt_type=default flt_action=block
msg="Rejecting unsupported NAT request" proto=icmp src=10.2.210.250
srcport=3 dst=192.168.128.10 dstport=3 interface=fxp1 flags=0xd

Which is unusual in itself as the src is my Cisco Catalyst 4006 and the dst
is a private address that I have no routes for.  I can only assume that my
4006 is sending it to the GnatBox because my default route points to the
GnatBox.  The part I don't understand is the "Rejecting unsupported NAT
request".  The only service my 4006 should be running that would hit the
internet by itself is NTP, which works fine.

Anyone else running into anything like this?  I reported it to Support about
3 weeks ago and they indicated they would look into it, but I never heard
back.

Bob Reasoner
Harris County Public Health & Environmental Services

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