disable_xfrm

file: /proc/sys/net/ipv4/conf/interface/disable_xfrm
variable: net.ipv4.conf.interface.disable_xfrm
Official reference

Disable IPSEC encryption on this interface, whatever the policy

Nb: per interface setting (where “interface” is the name of your network interface); “all” is a special interface: changes the settings for all interfaces.

source