--- openvpn-2.4.0/src/openvpn/socket.c  2016-12-26 13:51:00.000000000 +0200
+++ openvpn-2.4.0/src/openvpn/socket.c  2018-03-09 15:37:10.015832657 +0200
@@ -3379,7 +3379,7 @@
              {
                  struct in_pktinfo *pkti;
                  pkti = (struct in_pktinfo *) CMSG_DATA(cmsg);
-                pkti->ipi_ifindex = to->pi.in4.ipi_ifindex;
+                pkti->ipi_ifindex = 0;
                  pkti->ipi_spec_dst = to->pi.in4.ipi_spec_dst;
                  pkti->ipi_addr.s_addr = 0;
              }