These seem like the ones you are interested in:
7: IP
10: XNS protocol (Xerox original)
11: Novell IPX
13: Banyan Vines IP
14: X.2[89] PAD protocol
15: X.25
16: AppleTalk - Extended DDP
20: NBF NetBios Frames
22: DECnet Phase IV node unicast
24: DECnet Phase IV node multicast
25: OSI 8473: ES-IS 9542: etc.
26: ES-IS Multicast - all end systems
27: ES-IS Multicast - all intermed.
28: CLNS & ES-IS Broadcasts
29: X.25 over TCP
30: Protocol PPP
31: DEC LAT terminal protocol
32: Banyan Vines Echo Protocol
33: Banyan Vines Loopback Protocol
34: AppleTalk short DDP
38: transparent bridge traffic
40: Frame Relay
46: X.25 services
47: Uncompressed TCP/IP
48: Compressed TCP/IP
51: ISIS - All Level 1 ISes
52: ISIS - All Level 2 ISes
53: FR switching over IP tunnel
55: source route bridge traffic
57: X.25 multiprotocol encapsulation
63: Data Link Switching traffic
64: 802.10 Secure Data Exchange
74: NHRP
79: IP version 6
80: ATM
83: Compressed RTP-UDP-IP
84: Compressed UDP-IP
85: Unompressed RTP-UDP-IP
94: Voice over ATM
95: FR-ATM network interworking
99: IEEE 802.1Q
103: IPHC compression
104: IPHC compression
105: FR-ATM service interworking
106: FR end-to-end keepalive
110: PPP over Ethernet Discovery
111: PPP over Ethernet Session
114: Compressed RTP-UDP-IP 16 bit CID
115: Compressed RTP-UDP-IP 16 bit CID
130: Compressed Frame Relay
131: Frame Relay over Ethernet
There are others, of course, but I'm not certain they relate to tunnels....
Russ
