Possible enumeration values:

NameValueDescription
IP

0

IPv6HopByHopOptions

0

Icmp

1

Igmp

2

Ggp

3

IPv4

4

Tcp

6

Pup

12

Udp

17

Idp

22

IPv6

41

IPv6RoutingHeader

43

IPv6FragmentHeader

44

IPSecEncapsulatingSecurityPayload

50

IPSecAuthenticationHeader

51

IcmpV6

58

IPv6NoNextHeader

59

IPv6DestinationOptions

60

ND

77

Raw

255

Unspecified

0

Ipx

1000

Spx

1256

SpxII

1257

Unknown

-1