default or selected kernelversion does not have config value CONFIG_IP_NF_PPTP.
Result is shown for kernelversion 5.4.123
PPTP protocol support
modulename: ip_conntrack_pptp.ko
configname: CONFIG_IP_NF_PPTP
Linux Kernel Configuration
└─>Networking
└─>Networking options
└─>Network packet filtering (replaces ipchains)
└─>IP: Netfilter Configuration
└─>PPTP protocol support
In linux kernel since version 2.6.14 (release Date: 2005-10-27)
This module adds support for PPTP (Point to Point Tunnelling
Protocol, RFC2637) connection tracking and NAT.
If you are running PPTP sessions over a stateful firewall or NAT
box, you may want to enable this feature.
Please note that not all PPTP modes of operation are supported yet.
For more info, read top of the file
net/ipv4/netfilter/ip_conntrack_pptp.c
If you want to compile it as a module, say M here and read Documentation/modules.txt. If unsure, say `N'.
Protocol, RFC2637) connection tracking and NAT.
If you are running PPTP sessions over a stateful firewall or NAT
box, you may want to enable this feature.
Please note that not all PPTP modes of operation are supported yet.
For more info, read top of the file
net/ipv4/netfilter/ip_conntrack_pptp.c
If you want to compile it as a module, say M here and read Documentation/modules.txt. If unsure, say `N'.