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There is IP the internet protocol it only uses IP address and provides a packet carrier for several other protocols....<br />
of which ICMP (1), TCP(6), UDP(17) &nbsp;are the best known. Others are: IGMP(2), ESP(50), GRE(47), L2TP (115) , IPV6 (41)....<br />
Check /etc/protocols &nbsp;and RFC's for those protocols on details.
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There is IP the internet protocol it only uses IP address and provides a packet carrier for several other protocols....
of which ICMP (1), TCP(6), UDP(17)  are the best known. Others are: IGMP(2), ESP(50), GRE(47), L2TP (115) , IPV6 (41)....
Check /etc/protocols  and RFC's for those protocols on details.

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Relation between icmp and tcp,udp?
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i want to know about the Relation between icmp and tcp,udp?

Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functionality of the operating system. The best known frameworks are the TCP/IP model and the OSI model. Systems typically do not use a single protocol to handle a transmission. Instead they use a set of cooperating protocols, sometimes called a protocol family or protocol suite.[9] Some of the best known protocol suites include: IPX/SPX, X.25, AX.25, AppleTalk and TCP/IP. Other protocols indirectly related to networking include the hypertext transfer protocol (HTTP) and its related technologies, Dynamic Host Configuration Protocol (DHCP), Domain Name Server (DNS) and other Internet protocols.