I'm having an issues opening up multiple connections to the same
destination on the WAN site of the firewall.
For example my internal address is 10.10.0.1 my external NATed address
is 192.168.5.13 and my destination is 192.168.5.15.
I start a ping on 10.10.0.10 to 192.168.5.15 and it is successful,
I then start a ping on 10.10.0.12 to 192.168.5.15 and it fails,
However after a short time the ping will fail from 10.10.0.10 and be
successful from 10.10.0.12, and short time after that the ping will fail
from 10.10.0.12 and be successful form 10.10.0.10. This carries on and
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