Classic DMVPN on IPSec. The force instead of UDP/4500 ESP?

Hi, we have classic DMVPN pattern with central router and rays, all IOS routers.

One of the remote sites a ISP evil, that filters GRE and ESP (I think they filter all except tcp, udp and icmp).

Is it possible to force speaks rather to use udp/4500 ESP?

All about suggestions? The mission satellite IP is dynamic and changes over time.

The router should already have NAT - T enabled by default, but if it is disabled, then you can configure the following:

Crypto ipsec nat transparency

Tags: Cisco Security

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