DHU when pinging from the outside into inside (NAT Dynamic Overload)

[mwahyuf94]

Hi, i want to ask someething. I have created a simple topology on NAT dynamic overload. I pinged from the inside nat (blue circle area) where the pc pinged to the outer area to the server and it worked. However, when the outside server wants to ping the inside PC, it experiences DHU. The outside server will successfully ping back to the PC from the inside pinging to the outside server as well so both can ping each other.

[MHM Cisco World]

DHU <<- what you meaning of this 
MHM

[balaji.bandi]

The outside server will successfully ping back to the PC from the inside pinging to the outside server as well so both can ping each other.

When you have NAT overloaded from inside to outside (that does not mean outside to inside also)

You need to have port-forward outside to inside.

you can have example Nat allow outside to inside :

ip nat inside source static x.x.x.x y.y.y.y  ( x.x.x.x - outside Public IP y.y.y.y inside PC IP)