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    DHCP - need help reading logs

    DHCP and DNS
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    • P
      PM_13 last edited by

      Hi,

      I am setting up an Ubuntu machine for my TV and have assigned its MAC a static IP address of 192.168.10.36. But at the time of installation the machine is not able to get connected to the network. Attached is the log of packets captured on port 67-68 for this MAC and to me it seems like pfSense is providing the right IP (192.168.10.36) and the problem is likely on the Ubuntu machine.

      But would like a second opinion from those who knows how to read these logs better than me and will appreciate any pointers.
      Thanks.

      08:38:33.955066 00:13:3b:2f:d4:2a > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 326: (tos 0xc0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 312)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 00:13:3b:2f:d4:2a, length 284, xid 0x2946f119, secs 2, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Discover
	    Client-ID Option 61, length 7: ether 00:13:3b:2f:d4:2a
	    Parameter-Request Option 55, length 17: 
	      Subnet-Mask, Time-Zone, Domain-Name-Server, Hostname
	      Domain-Name, MTU, BR, Classless-Static-Route
	      Default-Gateway, Static-Route, YD, YS
	      NTP, Option 119, Classless-Static-Route-Microsoft, Option 252
	      RP
	    MSZ Option 57, length 2: 576
	    Hostname Option 12, length 6: "ubuntu"
08:38:33.955272 40:62:31:0b:30:c2 > 00:13:3b:2f:d4:2a, ethertype IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    192.168.10.1.67 > 192.168.10.36.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0x2946f119, secs 2, Flags [none] (0x0000)
	  Your-IP 192.168.10.36
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Offer
	    Server-ID Option 54, length 4: 192.168.10.1
	    Lease-Time Option 51, length 4: 7200
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    Domain-Name-Server Option 6, length 4: 192.168.10.1
	    Hostname Option 12, length 8: "tvubuntu"
	    Domain-Name Option 15, length 11: "localdomain"
	    Default-Gateway Option 3, length 4: 192.168.10.1
08:38:33.955592 00:13:3b:2f:d4:2a > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 338: (tos 0xc0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 324)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 00:13:3b:2f:d4:2a, length 296, xid 0x2946f119, secs 2, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Request
	    Client-ID Option 61, length 7: ether 00:13:3b:2f:d4:2a
	    Parameter-Request Option 55, length 17: 
	      Subnet-Mask, Time-Zone, Domain-Name-Server, Hostname
	      Domain-Name, MTU, BR, Classless-Static-Route
	      Default-Gateway, Static-Route, YD, YS
	      NTP, Option 119, Classless-Static-Route-Microsoft, Option 252
	      RP
	    MSZ Option 57, length 2: 576
	    Requested-IP Option 50, length 4: 192.168.10.36
	    Server-ID Option 54, length 4: 192.168.10.1
	    Hostname Option 12, length 6: "ubuntu"
08:38:33.955879 40:62:31:0b:30:c2 > 00:13:3b:2f:d4:2a, ethertype IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    192.168.10.1.67 > 192.168.10.36.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0x2946f119, secs 2, Flags [none] (0x0000)
	  Your-IP 192.168.10.36
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: ACK
	    Server-ID Option 54, length 4: 192.168.10.1
	    Lease-Time Option 51, length 4: 7200
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    Domain-Name-Server Option 6, length 4: 192.168.10.1
	    Hostname Option 12, length 8: "tvubuntu"
	    Domain-Name Option 15, length 11: "localdomain"
	    Default-Gateway Option 3, length 4: 192.168.10.1
08:38:33.956136 00:13:3b:2f:d4:2a > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 326: (tos 0xc0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 312)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 00:13:3b:2f:d4:2a, length 284, xid 0x6cc0562b, secs 1, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Discover
	    Client-ID Option 61, length 7: ether 00:13:3b:2f:d4:2a
	    Parameter-Request Option 55, length 17: 
	      Subnet-Mask, Time-Zone, Domain-Name-Server, Hostname
	      Domain-Name, MTU, BR, Classless-Static-Route
	      Default-Gateway, Static-Route, YD, YS
	      NTP, Option 119, Classless-Static-Route-Microsoft, Option 252
	      RP
	    MSZ Option 57, length 2: 576
	    Hostname Option 12, length 6: "ubuntu"
08:38:33.956280 40:62:31:0b:30:c2 > 00:13:3b:2f:d4:2a, ethertype IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    192.168.10.1.67 > 192.168.10.36.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0x6cc0562b, secs 1, Flags [none] (0x0000)
	  Your-IP 192.168.10.36
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Offer
	    Server-ID Option 54, length 4: 192.168.10.1
	    Lease-Time Option 51, length 4: 7200
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    Domain-Name-Server Option 6, length 4: 192.168.10.1
	    Hostname Option 12, length 8: "tvubuntu"
	    Domain-Name Option 15, length 11: "localdomain"
	    Default-Gateway Option 3, length 4: 192.168.10.1
08:38:33.956562 00:13:3b:2f:d4:2a > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 338: (tos 0xc0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 324)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 00:13:3b:2f:d4:2a, length 296, xid 0x6cc0562b, secs 1, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Request
	    Client-ID Option 61, length 7: ether 00:13:3b:2f:d4:2a
	    Parameter-Request Option 55, length 17: 
	      Subnet-Mask, Time-Zone, Domain-Name-Server, Hostname
	      Domain-Name, MTU, BR, Classless-Static-Route
	      Default-Gateway, Static-Route, YD, YS
	      NTP, Option 119, Classless-Static-Route-Microsoft, Option 252
	      RP
	    MSZ Option 57, length 2: 576
	    Requested-IP Option 50, length 4: 192.168.10.36
	    Server-ID Option 54, length 4: 192.168.10.1
	    Hostname Option 12, length 6: "ubuntu"
08:38:33.956815 40:62:31:0b:30:c2 > 00:13:3b:2f:d4:2a, ethertype IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    192.168.10.1.67 > 192.168.10.36.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0x6cc0562b, secs 1, Flags [none] (0x0000)
	  Your-IP 192.168.10.36
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: ACK
	    Server-ID Option 54, length 4: 192.168.10.1
	    Lease-Time Option 51, length 4: 7200
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    Domain-Name-Server Option 6, length 4: 192.168.10.1
	    Hostname Option 12, length 8: "tvubuntu"
	    Domain-Name Option 15, length 11: "localdomain"
	    Default-Gateway Option 3, length 4: 192.168.10.1
08:38:35.957032 00:13:3b:2f:d4:2a > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 326: (tos 0xc0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 312)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 00:13:3b:2f:d4:2a, length 284, xid 0x3cd6ad16, secs 1, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Discover
	    Client-ID Option 61, length 7: ether 00:13:3b:2f:d4:2a
	    Parameter-Request Option 55, length 17: 
	      Subnet-Mask, Time-Zone, Domain-Name-Server, Hostname
	      Domain-Name, MTU, BR, Classless-Static-Route
	      Default-Gateway, Static-Route, YD, YS
	      NTP, Option 119, Classless-Static-Route-Microsoft, Option 252
	      RP
	    MSZ Option 57, length 2: 576
	    Hostname Option 12, length 6: "ubuntu"
08:38:35.957317 40:62:31:0b:30:c2 > 00:13:3b:2f:d4:2a, ethertype IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    192.168.10.1.67 > 192.168.10.36.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0x3cd6ad16, secs 1, Flags [none] (0x0000)
	  Your-IP 192.168.10.36
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Offer
	    Server-ID Option 54, length 4: 192.168.10.1
	    Lease-Time Option 51, length 4: 7200
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    Domain-Name-Server Option 6, length 4: 192.168.10.1
	    Hostname Option 12, length 8: "tvubuntu"
	    Domain-Name Option 15, length 11: "localdomain"
	    Default-Gateway Option 3, length 4: 192.168.10.1
08:38:35.957623 00:13:3b:2f:d4:2a > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 338: (tos 0xc0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 324)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 00:13:3b:2f:d4:2a, length 296, xid 0x3cd6ad16, secs 1, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Request
	    Client-ID Option 61, length 7: ether 00:13:3b:2f:d4:2a
	    Parameter-Request Option 55, length 17: 
	      Subnet-Mask, Time-Zone, Domain-Name-Server, Hostname
	      Domain-Name, MTU, BR, Classless-Static-Route
	      Default-Gateway, Static-Route, YD, YS
	      NTP, Option 119, Classless-Static-Route-Microsoft, Option 252
	      RP
	    MSZ Option 57, length 2: 576
	    Requested-IP Option 50, length 4: 192.168.10.36
	    Server-ID Option 54, length 4: 192.168.10.1
	    Hostname Option 12, length 6: "ubuntu"
08:38:35.957897 40:62:31:0b:30:c2 > 00:13:3b:2f:d4:2a, ethertype IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    192.168.10.1.67 > 192.168.10.36.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0x3cd6ad16, secs 1, Flags [none] (0x0000)
	  Your-IP 192.168.10.36
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: ACK
	    Server-ID Option 54, length 4: 192.168.10.1
	    Lease-Time Option 51, length 4: 7200
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    Domain-Name-Server Option 6, length 4: 192.168.10.1
	    Hostname Option 12, length 8: "tvubuntu"
	    Domain-Name Option 15, length 11: "localdomain"
	    Default-Gateway Option 3, length 4: 192.168.10.1
08:38:39.958136 00:13:3b:2f:d4:2a > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 326: (tos 0xc0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 312)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 00:13:3b:2f:d4:2a, length 284, xid 0x36ee320c, secs 1, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Discover
	    Client-ID Option 61, length 7: ether 00:13:3b:2f:d4:2a
	    Parameter-Request Option 55, length 17: 
	      Subnet-Mask, Time-Zone, Domain-Name-Server, Hostname
	      Domain-Name, MTU, BR, Classless-Static-Route
	      Default-Gateway, Static-Route, YD, YS
	      NTP, Option 119, Classless-Static-Route-Microsoft, Option 252
	      RP
	    MSZ Option 57, length 2: 576
	    Hostname Option 12, length 6: "ubuntu"
08:38:39.958339 40:62:31:0b:30:c2 > 00:13:3b:2f:d4:2a, ethertype IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    192.168.10.1.67 > 192.168.10.36.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0x36ee320c, secs 1, Flags [none] (0x0000)
	  Your-IP 192.168.10.36
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Offer
	    Server-ID Option 54, length 4: 192.168.10.1
	    Lease-Time Option 51, length 4: 7200
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    Domain-Name-Server Option 6, length 4: 192.168.10.1
	    Hostname Option 12, length 8: "tvubuntu"
	    Domain-Name Option 15, length 11: "localdomain"
	    Default-Gateway Option 3, length 4: 192.168.10.1
08:38:39.958677 00:13:3b:2f:d4:2a > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 338: (tos 0xc0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 324)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 00:13:3b:2f:d4:2a, length 296, xid 0x36ee320c, secs 1, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Request
	    Client-ID Option 61, length 7: ether 00:13:3b:2f:d4:2a
	    Parameter-Request Option 55, length 17: 
	      Subnet-Mask, Time-Zone, Domain-Name-Server, Hostname
	      Domain-Name, MTU, BR, Classless-Static-Route
	      Default-Gateway, Static-Route, YD, YS
	      NTP, Option 119, Classless-Static-Route-Microsoft, Option 252
	      RP
	    MSZ Option 57, length 2: 576
	    Requested-IP Option 50, length 4: 192.168.10.36
	    Server-ID Option 54, length 4: 192.168.10.1
	    Hostname Option 12, length 6: "ubuntu"
08:38:39.958979 40:62:31:0b:30:c2 > 00:13:3b:2f:d4:2a, ethertype IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    192.168.10.1.67 > 192.168.10.36.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0x36ee320c, secs 1, Flags [none] (0x0000)
	  Your-IP 192.168.10.36
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: ACK
	    Server-ID Option 54, length 4: 192.168.10.1
	    Lease-Time Option 51, length 4: 7200
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    Domain-Name-Server Option 6, length 4: 192.168.10.1
	    Hostname Option 12, length 8: "tvubuntu"
	    Domain-Name Option 15, length 11: "localdomain"
	    Default-Gateway Option 3, length 4: 192.168.10.1
08:38:47.959173 00:13:3b:2f:d4:2a > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 326: (tos 0xc0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 312)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 00:13:3b:2f:d4:2a, length 284, xid 0xc85cedba, secs 1, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Discover
	    Client-ID Option 61, length 7: ether 00:13:3b:2f:d4:2a
	    Parameter-Request Option 55, length 17: 
	      Subnet-Mask, Time-Zone, Domain-Name-Server, Hostname
	      Domain-Name, MTU, BR, Classless-Static-Route
	      Default-Gateway, Static-Route, YD, YS
	      NTP, Option 119, Classless-Static-Route-Microsoft, Option 252
	      RP
	    MSZ Option 57, length 2: 576
	    Hostname Option 12, length 6: "ubuntu"
08:38:47.959377 40:62:31:0b:30:c2 > 00:13:3b:2f:d4:2a, ethertype IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    192.168.10.1.67 > 192.168.10.36.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0xc85cedba, secs 1, Flags [none] (0x0000)
	  Your-IP 192.168.10.36
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Offer
	    Server-ID Option 54, length 4: 192.168.10.1
	    Lease-Time Option 51, length 4: 7200
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    Domain-Name-Server Option 6, length 4: 192.168.10.1
	    Hostname Option 12, length 8: "tvubuntu"
	    Domain-Name Option 15, length 11: "localdomain"
	    Default-Gateway Option 3, length 4: 192.168.10.1
08:38:47.959614 00:13:3b:2f:d4:2a > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 338: (tos 0xc0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 324)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 00:13:3b:2f:d4:2a, length 296, xid 0xc85cedba, secs 1, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Request
	    Client-ID Option 61, length 7: ether 00:13:3b:2f:d4:2a
	    Parameter-Request Option 55, length 17: 
	      Subnet-Mask, Time-Zone, Domain-Name-Server, Hostname
	      Domain-Name, MTU, BR, Classless-Static-Route
	      Default-Gateway, Static-Route, YD, YS
	      NTP, Option 119, Classless-Static-Route-Microsoft, Option 252
	      RP
	    MSZ Option 57, length 2: 576
	    Requested-IP Option 50, length 4: 192.168.10.36
	    Server-ID Option 54, length 4: 192.168.10.1
	    Hostname Option 12, length 6: "ubuntu"
08:38:47.959896 40:62:31:0b:30:c2 > 00:13:3b:2f:d4:2a, ethertype IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    192.168.10.1.67 > 192.168.10.36.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0xc85cedba, secs 1, Flags [none] (0x0000)
	  Your-IP 192.168.10.36
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: ACK
	    Server-ID Option 54, length 4: 192.168.10.1
	    Lease-Time Option 51, length 4: 7200
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    Domain-Name-Server Option 6, length 4: 192.168.10.1
	    Hostname Option 12, length 8: "tvubuntu"
	    Domain-Name Option 15, length 11: "localdomain"
	    Default-Gateway Option 3, length 4: 192.168.10.1
08:39:03.959990 00:13:3b:2f:d4:2a > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 326: (tos 0xc0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 312)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 00:13:3b:2f:d4:2a, length 284, xid 0x98e599ee, secs 1, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Discover
	    Client-ID Option 61, length 7: ether 00:13:3b:2f:d4:2a
	    Parameter-Request Option 55, length 17: 
	      Subnet-Mask, Time-Zone, Domain-Name-Server, Hostname
	      Domain-Name, MTU, BR, Classless-Static-Route
	      Default-Gateway, Static-Route, YD, YS
	      NTP, Option 119, Classless-Static-Route-Microsoft, Option 252
	      RP
	    MSZ Option 57, length 2: 576
	    Hostname Option 12, length 6: "ubuntu"
08:39:03.960192 40:62:31:0b:30:c2 > 00:13:3b:2f:d4:2a, ethertype IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    192.168.10.1.67 > 192.168.10.36.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0x98e599ee, secs 1, Flags [none] (0x0000)
	  Your-IP 192.168.10.36
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Offer
	    Server-ID Option 54, length 4: 192.168.10.1
	    Lease-Time Option 51, length 4: 7200
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    Domain-Name-Server Option 6, length 4: 192.168.10.1
	    Hostname Option 12, length 8: "tvubuntu"
	    Domain-Name Option 15, length 11: "localdomain"
	    Default-Gateway Option 3, length 4: 192.168.10.1
08:39:03.960509 00:13:3b:2f:d4:2a > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 338: (tos 0xc0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 324)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 00:13:3b:2f:d4:2a, length 296, xid 0x98e599ee, secs 1, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Request
	    Client-ID Option 61, length 7: ether 00:13:3b:2f:d4:2a
	    Parameter-Request Option 55, length 17: 
	      Subnet-Mask, Time-Zone, Domain-Name-Server, Hostname
	      Domain-Name, MTU, BR, Classless-Static-Route
	      Default-Gateway, Static-Route, YD, YS
	      NTP, Option 119, Classless-Static-Route-Microsoft, Option 252
	      RP
	    MSZ Option 57, length 2: 576
	    Requested-IP Option 50, length 4: 192.168.10.36
	    Server-ID Option 54, length 4: 192.168.10.1
	    Hostname Option 12, length 6: "ubuntu"
08:39:03.960789 40:62:31:0b:30:c2 > 00:13:3b:2f:d4:2a, ethertype IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    192.168.10.1.67 > 192.168.10.36.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0x98e599ee, secs 1, Flags [none] (0x0000)
	  Your-IP 192.168.10.36
	  Client-Ethernet-Address 00:13:3b:2f:d4:2a
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: ACK
	    Server-ID Option 54, length 4: 192.168.10.1
	    Lease-Time Option 51, length 4: 7200
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    Domain-Name-Server Option 6, length 4: 192.168.10.1
	    Hostname Option 12, length 8: "tvubuntu"
	    Domain-Name Option 15, length 11: "localdomain"
	    Default-Gateway Option 3, length 4: 192.168.10.1
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        viragomann @PM_13 last edited by

        @PM_13 said in DHCP - need help reading logs:

        to me it seems like pfSense is providing the right IP (192.168.10.36) and the problem is likely on the Ubuntu machine.

        Agree.
        The client also sends its request with the correct IP to the server:

        Requested-IP Option 50, length 4: 192.168.10.36

        So he already accepts the DHCP offer.
        The server responses with an acknowledge, so the DHCP session should be finalized, but the client sends a new Discover after that.

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          PM_13 @viragomann last edited by

          @viragomann Thanks for the confirmation. Since this is a static IP I worked around by assigning it manually on the Ubuntu box which seems to be working for now!😇

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