Sonicwall 4100 wrong NAT

Hello Group,

I discovered a problem on a Sonicwall 4100 and NAT.
On the external Address is the sonicwall connected, 2 hosts are behind the
firewall.
Host A sends a icmp echo request to an external IP, the reply comes as
expected.
If I now start an icmp echo request from host B to the same external IP,
the expected reply comes and the reply which is usually for host A comes
also to host B. On the Sonicwall itlsef I sniffed via the included packet
trace and it seems all to be correct.
But the second reply on host B has the sequence number of the echo request
it was sent by host A, by this time host A doesn't get any icmp reply
packets.
Does anyone have similar problems?
BTW: I have a open ticket at sonisupport since a week with no solution...

regards
.

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