module08-icmp

module08-icmp - 1 Internet Control Message Protocol (ICMP)...

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Unformatted text preview: 1 Internet Control Message Protocol (ICMP) Relates to Lab 2: A short module on the Internet Control Message Protocol (ICMP). 2 The IP (Internet Protocol) relies on several other protocols to perform necessary control and routing functions: Control functions (ICMP) Multicast signaling (IGMP) Setting up routing tables (RIP, OSPF, BGP, PIM, ) Control Routing ICMP IGMP RIP OSPF BGP PIM Overview 3 Overview The Internet Control Message Protocol (ICMP) is a helper protocol that supports IP with facility for Error reporting Simple queries ICMP messages are encapsulated as IP datagrams: IP header ICMP message IP payload 4 ICMP message format additional information or 0x00000000 type code checksum bit # 15 23 24 8 31 7 16 4 byte header: Type (1 byte): type of ICMP message Code (1 byte): subtype of ICMP message Checksum (2 bytes): similar to IP header checksum. Checksum is calculated over entire ICMP message If there is no additional data, there are 4 bytes set to zero....
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module08-icmp - 1 Internet Control Message Protocol (ICMP)...

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