[root@node002 ~]# tcpdump -vv -i br0 udp
tcpdump: listening on br0, link-type EN10MB (Ethernet), capture size 65535 bytes
17:39:24.212593 IP (tos 0x0, ttl 64, id 1, offset 0, flags [none], proto UDP (17), length 415)
    0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request from 00:00:00:00:00:0d (oui Ethernet), length 387, xid 0xd, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:00:00:00:00:0d (oui Ethernet)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    GUID Option 97, length 17: 0.79.3.176.155.232.52.187.243.166.194.22.137.243.21.110.242
	    Client-ID Option 61, length 7: ether 00:00:00:00:00:0d
	    T175 Option 175, length 45: 177.5.1.16.236.129.57.19.1.1.23.1.1.21.1.1.24.1.1.35.1.1.34.1.1.25.1.1.33.1.1.16.1.2.18.1.1.17.1.1.235.3.0.9.7
	    DHCP-Message Option 53, length 1: Discover
	    MSZ Option 57, length 2: 1472
	    ARCH Option 93, length 2: 0
	    NDI Option 94, length 3: 1.2.1
	    Vendor-Class Option 60, length 32: "PXEClient:Arch:00000:UNDI:002001"
	    CLASS Option 77, length 4: "gPXE"
	    Parameter-Request Option 55, length 13: 
	      Subnet-Mask, Default-Gateway, Domain-Name-Server, LOG
	      Hostname, Domain-Name, RP, Vendor-Option
	      Vendor-Class, TFTP, BF, Option 175
	      Option 203
17:39:24.212659 IP (tos 0x0, ttl 64, id 1, offset 0, flags [none], proto UDP (17), length 415)
    0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request from 00:00:00:00:00:0d (oui Ethernet), length 387, xid 0xd, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:00:00:00:00:0d (oui Ethernet)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    GUID Option 97, length 17: 0.79.3.176.155.232.52.187.243.166.194.22.137.243.21.110.242
	    Client-ID Option 61, length 7: ether 00:00:00:00:00:0d
	    T175 Option 175, length 45: 177.5.1.16.236.129.57.19.1.1.23.1.1.21.1.1.24.1.1.35.1.1.34.1.1.25.1.1.33.1.1.16.1.2.18.1.1.17.1.1.235.3.0.9.7
	    DHCP-Message Option 53, length 1: Discover
	    MSZ Option 57, length 2: 1472
	    ARCH Option 93, length 2: 0
	    NDI Option 94, length 3: 1.2.1
	    Vendor-Class Option 60, length 32: "PXEClient:Arch:00000:UNDI:002001"
	    CLASS Option 77, length 4: "gPXE"
	    Parameter-Request Option 55, length 13: 
	      Subnet-Mask, Default-Gateway, Domain-Name-Server, LOG
	      Hostname, Domain-Name, RP, Vendor-Option
	      Vendor-Class, TFTP, BF, Option 175
	      Option 203
17:39:24.212913 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 388)
    master.cm.cluster.bootps > 255.255.255.255.bootpc: [udp sum ok] BOOTP/DHCP, Reply, length 360, xid 0xd, Flags [none] (0x0000)
	  Your-IP vm001.cm.cluster
	  Server-IP master.cm.cluster
	  Client-Ethernet-Address 00:00:00:00:00:0d (oui Ethernet)
	  file "cm-images/default-image/boot/pxelinux.0"
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Offer
	    Server-ID Option 54, length 4: master.cm.cluster
	    Lease-Time Option 51, length 4: 86400
	    Subnet-Mask Option 1, length 4: 255.255.0.0
	    Default-Gateway Option 3, length 4: master.cm.cluster
	    Domain-Name-Server Option 6, length 4: master.cm.cluster
	    Hostname Option 12, length 17: "vm001.internalnet"
	    Domain-Name Option 15, length 65: "eth.cluster brightcomputing.com ib.cluster ilo.cluster cm.cluster"
17:39:25.178728 IP (tos 0x0, ttl 64, id 2, offset 0, flags [none], proto UDP (17), length 415)
    0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request from 00:00:00:00:00:0d (oui Ethernet), length 387, xid 0xd, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:00:00:00:00:0d (oui Ethernet)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    GUID Option 97, length 17: 0.79.3.176.155.232.52.187.243.166.194.22.137.243.21.110.242
	    Client-ID Option 61, length 7: ether 00:00:00:00:00:0d
	    T175 Option 175, length 45: 177.5.1.16.236.129.57.19.1.1.23.1.1.21.1.1.24.1.1.35.1.1.34.1.1.25.1.1.33.1.1.16.1.2.18.1.1.17.1.1.235.3.0.9.7
	    DHCP-Message Option 53, length 1: Discover
	    MSZ Option 57, length 2: 1472
	    ARCH Option 93, length 2: 0
	    NDI Option 94, length 3: 1.2.1
	    Vendor-Class Option 60, length 32: "PXEClient:Arch:00000:UNDI:002001"
	    CLASS Option 77, length 4: "gPXE"
	    Parameter-Request Option 55, length 13: 
	      Subnet-Mask, Default-Gateway, Domain-Name-Server, LOG
	      Hostname, Domain-Name, RP, Vendor-Option
	      Vendor-Class, TFTP, BF, Option 175
	      Option 203
17:39:25.178784 IP (tos 0x0, ttl 64, id 2, offset 0, flags [none], proto UDP (17), length 415)
    0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request from 00:00:00:00:00:0d (oui Ethernet), length 387, xid 0xd, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:00:00:00:00:0d (oui Ethernet)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    GUID Option 97, length 17: 0.79.3.176.155.232.52.187.243.166.194.22.137.243.21.110.242
	    Client-ID Option 61, length 7: ether 00:00:00:00:00:0d
	    T175 Option 175, length 45: 177.5.1.16.236.129.57.19.1.1.23.1.1.21.1.1.24.1.1.35.1.1.34.1.1.25.1.1.33.1.1.16.1.2.18.1.1.17.1.1.235.3.0.9.7
	    DHCP-Message Option 53, length 1: Discover
	    MSZ Option 57, length 2: 1472
	    ARCH Option 93, length 2: 0
	    NDI Option 94, length 3: 1.2.1
	    Vendor-Class Option 60, length 32: "PXEClient:Arch:00000:UNDI:002001"
	    CLASS Option 77, length 4: "gPXE"
	    Parameter-Request Option 55, length 13: 
	      Subnet-Mask, Default-Gateway, Domain-Name-Server, LOG
	      Hostname, Domain-Name, RP, Vendor-Option
	      Vendor-Class, TFTP, BF, Option 175
	      Option 203
17:39:25.179009 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 388)
    master.cm.cluster.bootps > 255.255.255.255.bootpc: [udp sum ok] BOOTP/DHCP, Reply, length 360, xid 0xd, Flags [none] (0x0000)
	  Your-IP vm001.cm.cluster
	  Server-IP master.cm.cluster
	  Client-Ethernet-Address 00:00:00:00:00:0d (oui Ethernet)
	  file "cm-images/default-image/boot/pxelinux.0"
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Offer
	    Server-ID Option 54, length 4: master.cm.cluster
	    Lease-Time Option 51, length 4: 86400
	    Subnet-Mask Option 1, length 4: 255.255.0.0
	    Default-Gateway Option 3, length 4: master.cm.cluster
	    Domain-Name-Server Option 6, length 4: master.cm.cluster
	    Hostname Option 12, length 17: "vm001.internalnet"
	    Domain-Name Option 15, length 65: "eth.cluster brightcomputing.com ib.cluster ilo.cluster cm.cluster"
17:39:27.156065 IP (tos 0x0, ttl 64, id 3, offset 0, flags [none], proto UDP (17), length 427)
    0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request from 00:00:00:00:00:0d (oui Ethernet), length 399, xid 0xd, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:00:00:00:00:0d (oui Ethernet)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    Requested-IP Option 50, length 4: vm001.cm.cluster
	    Server-ID Option 54, length 4: master.cm.cluster
	    GUID Option 97, length 17: 0.79.3.176.155.232.52.187.243.166.194.22.137.243.21.110.242
	    Client-ID Option 61, length 7: ether 00:00:00:00:00:0d
	    T175 Option 175, length 45: 177.5.1.16.236.129.57.19.1.1.23.1.1.21.1.1.24.1.1.35.1.1.34.1.1.25.1.1.33.1.1.16.1.2.18.1.1.17.1.1.235.3.0.9.7
	    DHCP-Message Option 53, length 1: Request
	    MSZ Option 57, length 2: 1472
	    ARCH Option 93, length 2: 0
	    NDI Option 94, length 3: 1.2.1
	    Vendor-Class Option 60, length 32: "PXEClient:Arch:00000:UNDI:002001"
	    CLASS Option 77, length 4: "gPXE"
	    Parameter-Request Option 55, length 13: 
	      Subnet-Mask, Default-Gateway, Domain-Name-Server, LOG
	      Hostname, Domain-Name, RP, Vendor-Option
	      Vendor-Class, TFTP, BF, Option 175
	      Option 203
17:39:27.156121 IP (tos 0x0, ttl 64, id 3, offset 0, flags [none], proto UDP (17), length 427)
    0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request from 00:00:00:00:00:0d (oui Ethernet), length 399, xid 0xd, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:00:00:00:00:0d (oui Ethernet)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    Requested-IP Option 50, length 4: vm001.cm.cluster
	    Server-ID Option 54, length 4: master.cm.cluster
	    GUID Option 97, length 17: 0.79.3.176.155.232.52.187.243.166.194.22.137.243.21.110.242
	    Client-ID Option 61, length 7: ether 00:00:00:00:00:0d
	    T175 Option 175, length 45: 177.5.1.16.236.129.57.19.1.1.23.1.1.21.1.1.24.1.1.35.1.1.34.1.1.25.1.1.33.1.1.16.1.2.18.1.1.17.1.1.235.3.0.9.7
	    DHCP-Message Option 53, length 1: Request
	    MSZ Option 57, length 2: 1472
	    ARCH Option 93, length 2: 0
	    NDI Option 94, length 3: 1.2.1
	    Vendor-Class Option 60, length 32: "PXEClient:Arch:00000:UNDI:002001"
	    CLASS Option 77, length 4: "gPXE"
	    Parameter-Request Option 55, length 13: 
	      Subnet-Mask, Default-Gateway, Domain-Name-Server, LOG
	      Hostname, Domain-Name, RP, Vendor-Option
	      Vendor-Class, TFTP, BF, Option 175
	      Option 203
17:39:27.156373 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 388)
    master.cm.cluster.bootps > 255.255.255.255.bootpc: [udp sum ok] BOOTP/DHCP, Reply, length 360, xid 0xd, Flags [none] (0x0000)
	  Your-IP vm001.cm.cluster
	  Server-IP master.cm.cluster
	  Client-Ethernet-Address 00:00:00:00:00:0d (oui Ethernet)
	  file "cm-images/default-image/boot/pxelinux.0"
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: ACK
	    Server-ID Option 54, length 4: master.cm.cluster
	    Lease-Time Option 51, length 4: 86400
	    Subnet-Mask Option 1, length 4: 255.255.0.0
	    Default-Gateway Option 3, length 4: master.cm.cluster
	    Domain-Name-Server Option 6, length 4: master.cm.cluster
	    Hostname Option 12, length 17: "vm001.internalnet"
	    Domain-Name Option 15, length 65: "eth.cluster brightcomputing.com ib.cluster ilo.cluster cm.cluster"