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tcpdump_dhclient

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Nov 21st, 2020
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  1. sudo tcpdump -i enp37s0 -vv |grep -i bootp -a20
  2. tcpdump: listening on enp37s0, link-type EN10MB (Ethernet), capture size 262144 bytes
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  9. 00:17:22.938507 IP (tos 0x0, ttl 64, id 0, offset 0, flags [none], proto UDP (17), length 314)
  10. 0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request from 98:9d:5d:bc:c9:c2 (oui Unknown), length 286, xid 0x6ea2fee1, secs 56009, Flags [none] (0x0000)
  11. Client-Ethernet-Address 98:9d:5d:bc:c9:c2 (oui Unknown)
  12. Vendor-rfc1048 Extensions
  13. Magic Cookie 0x63825363
  14. DHCP-Message Option 53, length 1: Discover
  15. Client-ID Option 61, length 7: ether 98:9d:5d:bc:c9:c2
  16. Requested-IP Option 50, length 4: 192.168.0.10
  17. MSZ Option 57, length 2: 576
  18. Parameter-Request Option 55, length 7:
  19. Subnet-Mask, Default-Gateway, Domain-Name-Server, Hostname
  20. Domain-Name, BR, NTP
  21. Vendor-Class Option 60, length 12: "udhcp 1.19.3"
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