I can ping any other ip even though internet is working fine but when i tried to ping External public interface ip from internal its not rechable.
there is a internal to internet policy allowing ping and any other application.
Did you add an interface management profile to the external interface?
Yes, I added an interface management profile to the externral interface. if i removed the profile do you think it will reslove the issue?
Are you trying to ping that interface from 'inside' the network or from a true external source such as a website that performs test pings?
I would then make sure you have a u-turn NAT configured.
Cisco calls it a hairpin.
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