IP Protocol Number for Access-List
When we use extended access-list in the Cisco router (version 12.4(15)T1), there is no enough IP protocol number to map to real protocol. For example, there is no IP Protocol Number for OSPFv3 (89) and IPV6IP (41) Tunnel.
R5(config-ext-nacl)#permit ?
<0-255> An IP protocol number
ahp Authentication Header Protocol
eigrp Cisco’s EIGRP routing protocol
esp Encapsulation Security Payload
gre Cisco’s GRE tunneling
icmp Internet Control Message Protocol
igmp Internet Gateway Message Protocol
ip Any Internet Protocol
ipinip IP in IP tunneling
nos KA9Q NOS compatible IP over IP tunneling
ospf OSPF routing protocol
pcp Payload Compression Protocol
pim Protocol Independent Multicast
tcp Transmission Control Protocol
udp User Datagram Protocol
The IANA has a link to summary all possible IP Protocol Number. Put in here for me to reference in the future.
http://www.iana.org/assignments/protocol-numbers/
