Port forwarding Nighthawk m2

> [...] I tried to redirect three ports to this server but in vain [...]

   Not a very detailed description of your "a server", your
port-forwarding rules, how you tried to access your "a server" (or from
where), or the actual error message which you got when the attempt
failed.

> [...] I saw in the summary that this router has a IPV4 like 10.64....
> [...]

   "the summary"?  That's the IP[v4] address of its WAN/Internet
interface?

   Plug that address into the form at: https://whois.arin.net/ , and see
if it's a public address or a private address.  (There's no need to hide
any of a private address.)

> [...] but I cannot change this in the settings [...]

   Your ISP determines it.

> [...] and I think it's the problem.

   I agree.  For the usual problems with port forwarding, see:

      https://community.netgear.com/t5/x/x/m-p/1859106

   Concentrate on "1".

      https://en.wikipedia.org/wiki/Carrier-grade_NAT

   You can't reach your router at a private address from the outside
world.

> [...] The DMZ mode does not correct the problem too [...]

   Specifying a DMZ server dos not change the router's WAN/Internet IP
address.

> [...] I have install the latest Firmwire today for information.

   As always, an actual version number would be more useful than your
opinion of what's "latest" today.  But you have an ISP problem, not a
router firmware problem.

> Model: MR2100|Mobiler Router Nighthawk M2

   A more appropriate forum:

      https://community.netgear.com/t5/x/bd-p/aircard