Redirect traffic from one ip to another?

Question

iptables

Greetings!
There is a gateway on which you need to redirect all traffic (any port and protocol) from one IP to another.
For example, redirect everything from 192.168.0.101 to 192.168.0.100 and back:
I write:

iptables -t nat -A PREROUTING -d 192.168.0.101 -j DNAT --to-destination 192.168.0.100
iptables -t nat -A POSTROUTING -d  192.168.0.100 -j SNAT --to-source 192.168.0.101

ip_forward is enabled.

Anyway, the ping on 101 does not pass (on 100 passes).
Can you please tell me what is wrong and what needs to be added/removed?

Answer 1

Are these hosts accessed from the outside via a gray IP?