NARP, OSPF, TRIP, Mobile IP, Van Jacobson, XOT

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NBMA Address Resolution Protocol - allows a source terminal (a host or router), wishing to communicate over a Non-Broadcast, Multi-Access (NBMA) link layer network, to find out the NBMA addresses of a destination terminal if the destination terminal is connected to the same NBMA network as the source.

8	16	32
Version	Hop Count	Checksum
Type	Code	Unused
Destination IP address
Source IP address
NBNA Length	NBMA address (variable length)
Structure of the NARP header in 32 bit lines.

SCSP

Stream Control Transmission Protocol - is designed to serve distributed server entities that are bound to a Server Group (SG) through some means and need to synchronize the contents (or a portion thereof) of their caches, which contain information about the state of clients being served.

0								1								2														3
0	1	2	3	4	5	6	7	8	9	0	1	2	3	4	5	6	7	8	9	0	1	2	3	4	5	6	7	8	9	0	1
Version								Type code								Packet size
Checksum																Start of extensions
Structure of the SCSP header.

NHRP

Next Hop Resolution Protocol - allows a source station (a host or router), wishing to communicate over a Non-Broadcast, Multi-Access (NBMA) subnetwork, to determine the internetworking layer addresses and NBMA addresses of suitable NBMA next hops toward a destination station.

8	16	24	32
ar$afn		ar$pro.type
ar$pro.snap
ar$pro.snap	ar$hopcnt	ar$pkstz
ar$chksum		ar$extoff
ar$op.version	ar$op.type	ar$shtl	ar$sstl
Structure of the NHRP header in 32 bit lines.

OSPF

Open Shortest Path First - is an interior gateway protocol which is used for routing within a group of routers. It uses link-state technology in which routers send each other information about the direct connections and links which they have to other routers.

8	16	32
Version No.	Packet Type	Packet length
Router ID
Area ID
Checksum		AU type
Authentication
Structure of the OSPF header in 32 bit lines.

TRIP

Telephony Routing over IP - is to advertise the reachability of telephony destinations, attributes associated with the destinations, as well as the attributes of the path towards those destinations.

	0										1										2
	0	1	2	3	4	5	6	7	8	9	0	1	2	3	4	5	6	7	8	9	0	1	2	3
0	Length																Type
Structure of the TRIP header.

Mobile IP

Mobile IP - enables nodes to move from one IP subnet to another. Each mobile node is always identified by its home address, regardless of its current point of attachment to the Internet. While situated away from its home, a mobile node is also associated with a care-of address, which provides information about its current point of attachment to the Internet.

8	9	10	11	12	13	14	15	16	Octet
Type	S	B	D	M	G	V	T	Rsv	2
Lifetime									4
Home address									8
Home agent									12
Care of address									16
Identification									20
Extensions ....									....
Structure of the Mobile IP request header.

The format of the Mobile IP registration reply message:

8	16	32
Type	Code	Lifetime
Home address 8 Octets
Home agent 12 Octets
Identification 20 Octets :
Extensions .....
Structure of the Mobile IP reply header.

RUDP

Reliable UDP - is designed to allow characteristics of each connection to be individually configured so that a number of protocols with different transport requirement can be implemented simultaneously not on the same platform. It is layered on the UDP/IP protocols and provides reliable in-order delivery (up to a maximum number of retransmissions) for virtual connections.

8								16
SYN	ACK	EAK	RST	NUL	CHK	TCS	0	Header Length
Sequence number								Acknowledgement number
Checksum
Structure of the RUDP header in 16 bit lines.

TALI

Transport Adapter Layer Interface - provides TCAP, ISUP, and MTP messaging over TCP / IP and is used to support reliable communication between the SS7 Signaling Network and applications residing within the IP network.

16	32
SYNC
OpCode
Length	Service message data
Structure of the TALI in 32 bit lines.

Van Jacobson

Compressed TCP - improves the TCP / IP performance over low speed (300 to 19,200 bps) serial links.

8
	C	I	P	S	A	W	U
Connection number (C)
TCP checksum
Urgent pointer (U)
D Window (W)
D Ack (A)
D Sequence (S)
D IP ID (I)
data
Compressed TCP Structure.

XOT

Cisco Systems X.25 over TCP.

16	32
Version	Length
Structure of the XOT header in 32 bit lines.

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