D-5
Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide
OL-6392-01
Appendix D Addresses, Protocols, and Ports Reference
Protocols and Applications
Protocols and Applications
This section provides information about the protocols and applications with which you may need to work
when configuring the FWSM. It includes the following topics:
Possible literal values are ahp, eigrp, esp, gre, icmp, igmp, igrp, ip, ipinip, ipsec, nos, ospf, pcp, snp,
tcp, and udp. You can also specify any protocol by number. The esp and ah protocols only work in
conjunction with Private Link.
Note The FWSM does not pass multicast packets. Many routing protocols use multicast packets for data
transfer. If you need to send routing protocols across the FWSM, configure the routers with the Cisco
IOS software neighbor command. We consider it inherently dangerous to send routing protocols across
the FWSM. If the routes on the unprotected interface are corrupted, the routes transmitted to the
protected side of the firewall will pollute routers there as well.
Table D-2 lists the numeric values for the protocol literals.
Protocol numbers can be viewed online at the IANA website:
http://www.iana.org/assignments/protocol-numbers
Table D-2 Protocol Literal Values
Literal Value Description
ah 51 Authentication Header for IPv6, RFC 1826
eigrp 88 Enhanced Interior Gateway Routing Protocol
esp 50 Encapsulated Security Payload for IPv6, RFC 1827
gre 47 generic routing encapsulation
icmp 1 Internet Control Message Protocol, RFC 792
igmp 2 Internet Group Management Protocol, RFC 1112
igrp 9 Interior Gateway Routing Protocol
ip 0 Internet Protocol
ipinip 4 IP-in-IP encapsulation
nos 94 Network Operating System (Novell’s NetWare)
ospf 89 Open Shortest Path First routing protocol, RFC 1247
pcp 108 Payload Compression Protocol
snp 109 Sitara Networks Protocol
tcp 6 Transmission Control Protocol, RFC 793
udp 17 User Datagram Protocol, RFC 768
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