Had the same issue at EG.

All the local users of Iowa Telcom are on the same subnet.  Your Sonicwall
is receiving web traffic on your ICN port and the Sonicwall is seeing all
of the Iowa Telcom users as local addresses trying to access through the
wrong port.  This is a classic IP Spoof and you can create NO rules to
circumvent it.

Solution, put a NAT device between your Iowa Telcom router/modem and your
sonicwall.

Make sure to restart the Sonicwall after making the change so that it can
make the correct adjustments also.

That was my fix.



Lance Lennon
District Technology Director
Eagle Grove Community School District



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