Index: services
===================================================================
RCS file: /cvs/src/etc/services,v
retrieving revision 1.96
diff -u -p -r1.96 services
--- services	27 Jan 2019 20:35:06 -0000	1.96
+++ services	22 Oct 2019 04:45:43 -0000
@@ -332,6 +332,20 @@ spamd-cfg	8026/tcp			# spamd(8) configur
 dhcpd-sync	8067/udp			# dhcpd(8) synchronisation
 hunt		26740/udp			# hunt(6)
 #
+# GRE Protocol Types
+#
+keepalive	0/gre				# 0x0000: IP tunnel keepalive
+ipv4		2048/gre			# 0x0800: IPv4
+nhrp		8193/gre			# 0x2001: Next Hop Resolution Protocol
+erspan3		8939/gre			# 0x22eb: ERSPAN III
+transether	25944/gre	ethernet	# 0x6558: Trans Ether Bridging
+ipv6		34525/gre			# 0x86dd: IPv6
+wccp		34878/gre			# 0x883e: Web Content Cache Protocol
+mpls		34887/gre			# 0x8847: MPLS
+#mpls		34888/gre			# 0x8848: MPLS Multicast
+erspan		35006/gre	erspan2		# 0x88be: ERSPAN I/II
+control		47082/gre			# 0xb7ea: RFC 8157
+#
 # Appletalk
 #
 rtmp		1/ddp				# Routing Table Maintenance Protocol