ICMP_DHCP - ICMP+DHCP ICMP:InternetControlMessageProtocol

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ICMP +DHCP
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Network Layer 4-2 ICMP: Internet Control Message Protocol communicate network-level  information error reporting: unreachable  host, network, port, protocol echo request/reply (used by  ping) network-layer “above” IP: ICMP msgs carried in IP  datagrams ICMP message:  type, code plus  first 8 bytes of IP datagram  causing error Type Code description 0 0 echo reply (ping) 3 0 dest. network unreachable 3 1 dest host unreachable 3 2 dest protocol unreachable 3 3 dest port unreachable 3 6 dest network unknown 3 7 dest host unknown 4 0 source quench (congestion control - not used) 8 0 echo request (ping) 9 0 route advertisement 10 0 router discovery 11 0 TTL expired 12 0 bad IP header
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Network Layer 4-3 Traceroute and ICMP Source sends series of UDP  segments to dest First has TTL =1 Second has TTL=2, etc. Unlikely port number
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ICMP_DHCP - ICMP+DHCP ICMP:InternetControlMessageProtocol

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