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TCPdump DHCP packets

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Apr 22nd, 2013
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  1. # tcpdump -i vl20-ovsbr0 -vvv
  2.  
  3. 12:02:13.590778 IP (tos 0x10, ttl 16, id 0, offset 0, flags [none], proto UDP (17), length 328)
  4. 0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request from 52:54:00:45:8c:6a (oui Unknown), length 300, xid 0x7cc8ffba, Flags [none] (0x0000)
  5. Client-Ethernet-Address 52:54:00:45:8c:6a (oui Unknown)
  6. Vendor-rfc1048 Extensions
  7. Magic Cookie 0x63825363
  8. DHCP-Message Option 53, length 1: Discover
  9. END Option 255, length 0
  10. PAD Option 0, length 0, occurs 56
  11.  
  12. 12:02:13.591118 IP (tos 0x0, ttl 64, id 36371, offset 0, flags [none], proto UDP (17), length 328)
  13. 192.168.20.254.bootps > 192.168.20.121.bootpc: [bad udp cksum 0xac0d -> 0xfe20!] BOOTP/DHCP, Reply, length 300, xid 0x7cc8ffba, Flags [none] (0x0000)
  14. Your-IP 192.168.20.121
  15. Server-IP 192.168.20.254
  16. Client-Ethernet-Address 52:54:00:45:8c:6a (oui Unknown)
  17. Vendor-rfc1048 Extensions
  18. Magic Cookie 0x63825363
  19. DHCP-Message Option 53, length 1: Offer
  20. Server-ID Option 54, length 4: 192.168.20.254
  21. Lease-Time Option 51, length 4: 14400
  22. RN Option 58, length 4: 7200
  23. RB Option 59, length 4: 12600
  24. Subnet-Mask Option 1, length 4: 255.255.255.0
  25. BR Option 28, length 4: 192.168.20.255
  26. Default-Gateway Option 3, length 4: 192.168.20.254
  27. Domain-Name-Server Option 6, length 4: 192.168.20.254
  28. END Option 255, length 0
  29. PAD Option 0, length 0, occurs 8
  30.  
  31. 12:02:13.595910 IP (tos 0x10, ttl 16, id 0, offset 0, flags [none], proto UDP (17), length 576)
  32. 0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request from 52:54:00:45:8c:6a (oui Unknown), length 548, xid 0x7dc8ffba, Flags [none] (0x0000)
  33. Client-Ethernet-Address 52:54:00:45:8c:6a (oui Unknown)
  34. Vendor-rfc1048 Extensions
  35. Magic Cookie 0x63825363
  36. DHCP-Message Option 53, length 1: Discover
  37. MSZ Option 57, length 2: 548
  38. Parameter-Request Option 55, length 12:
  39. Subnet-Mask, Default-Gateway, Domain-Name-Server, Domain-Name
  40. BR, Hostname, LOG, LPR-Server
  41. NTP, XFS, XDM, MTU
  42. Hostname Option 12, length 8: "Knoppix^@"
  43. Lease-Time Option 51, length 4: 43200
  44. END Option 255, length 0
  45. PAD Option 0, length 0, occurs 270
  46.  
  47. 12:02:13.596062 IP (tos 0x0, ttl 64, id 36372, offset 0, flags [none], proto UDP (17), length 328)
  48. 192.168.20.254.bootps > 192.168.20.121.bootpc: [bad udp cksum 0xac0d -> 0xfd20!] BOOTP/DHCP, Reply, length 300, xid 0x7dc8ffba, Flags [none] (0x0000)
  49. Your-IP 192.168.20.121
  50. Server-IP 192.168.20.254
  51. Client-Ethernet-Address 52:54:00:45:8c:6a (oui Unknown)
  52. Vendor-rfc1048 Extensions
  53. Magic Cookie 0x63825363
  54. DHCP-Message Option 53, length 1: Offer
  55. Server-ID Option 54, length 4: 192.168.20.254
  56. Lease-Time Option 51, length 4: 14400
  57. RN Option 58, length 4: 7200
  58. RB Option 59, length 4: 12600
  59. Subnet-Mask Option 1, length 4: 255.255.255.0
  60. BR Option 28, length 4: 192.168.20.255
  61. Default-Gateway Option 3, length 4: 192.168.20.254
  62. Domain-Name-Server Option 6, length 4: 192.168.20.254
  63. END Option 255, length 0
  64. PAD Option 0, length 0, occurs 8
  65.  
  66. 12:02:13.605764 IP (tos 0x10, ttl 16, id 0, offset 0, flags [none], proto UDP (17), length 576)
  67. 0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request from 52:54:00:45:8c:6a (oui Unknown), length 548, xid 0x7ec8ffba, Flags [none] (0x0000)
  68. Client-Ethernet-Address 52:54:00:45:8c:6a (oui Unknown)
  69. Vendor-rfc1048 Extensions
  70. Magic Cookie 0x63825363
  71. DHCP-Message Option 53, length 1: Request
  72. MSZ Option 57, length 2: 548
  73. Parameter-Request Option 55, length 12:
  74. Subnet-Mask, Default-Gateway, Domain-Name-Server, Domain-Name
  75. BR, Hostname, LOG, LPR-Server
  76. NTP, XFS, XDM, MTU
  77. Hostname Option 12, length 8: "Knoppix^@"
  78. Lease-Time Option 51, length 4: 43200
  79. Server-ID Option 54, length 4: 192.168.20.254
  80. Requested-IP Option 50, length 4: 192.168.20.121
  81. END Option 255, length 0
  82. PAD Option 0, length 0, occurs 258
  83.  
  84. 12:02:13.676251 IP (tos 0x0, ttl 64, id 36373, offset 0, flags [none], proto UDP (17), length 330)
  85. 192.168.20.254.bootps > 192.168.20.121.bootpc: [bad udp cksum 0xac0f -> 0xa86d!] BOOTP/DHCP, Reply, length 302, xid 0x7ec8ffba, Flags [none] (0x0000)
  86. Your-IP 192.168.20.121
  87. Server-IP 192.168.20.254
  88. Client-Ethernet-Address 52:54:00:45:8c:6a (oui Unknown)
  89. Vendor-rfc1048 Extensions
  90. Magic Cookie 0x63825363
  91. DHCP-Message Option 53, length 1: ACK
  92. Server-ID Option 54, length 4: 192.168.20.254
  93. Lease-Time Option 51, length 4: 14400
  94. RN Option 58, length 4: 7200
  95. RB Option 59, length 4: 12600
  96. Subnet-Mask Option 1, length 4: 255.255.255.0
  97. BR Option 28, length 4: 192.168.20.255
  98. Default-Gateway Option 3, length 4: 192.168.20.254
  99. Domain-Name-Server Option 6, length 4: 192.168.20.254
  100. Hostname Option 12, length 8: "Knoppix^@"
  101. END Option 255, length 0
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