/usr/share/dpdk/examples/ipsec-secgw/ is in dpdk-doc 17.11.1-6.
This file is owned by root:root, with mode 0o755.
..
/usr/share/dpdk/examples/ipsec-secgw/Makefile
/usr/share/dpdk/examples/ipsec-secgw/ep0.cfg
/usr/share/dpdk/examples/ipsec-secgw/ep1.cfg
/usr/share/dpdk/examples/ipsec-secgw/esp.c
/usr/share/dpdk/examples/ipsec-secgw/esp.h
/usr/share/dpdk/examples/ipsec-secgw/ipip.h
/usr/share/dpdk/examples/ipsec-secgw/ipsec-secgw.c
/usr/share/dpdk/examples/ipsec-secgw/ipsec.c
/usr/share/dpdk/examples/ipsec-secgw/ipsec.h
/usr/share/dpdk/examples/ipsec-secgw/parser.c
/usr/share/dpdk/examples/ipsec-secgw/parser.h
/usr/share/dpdk/examples/ipsec-secgw/rt.c
/usr/share/dpdk/examples/ipsec-secgw/sa.c
/usr/share/dpdk/examples/ipsec-secgw/sp4.c
/usr/share/dpdk/examples/ipsec-secgw/sp6.c