----- Forwarded Message -----
From: "Andrew Holway" <a.holway@xxxxxxxxxxxx>
To: "Alex Jia" <ajia@xxxxxxxxxx>
Cc: kvm@xxxxxxxxxxxxxxx
Sent: Friday, August 17, 2012 4:24:33 PM
Subject: Re: [libvirt-users] vm pxe fail
Hello,
On Aug 17, 2012, at 4:34 AM, Alex Jia wrote:
> Hi Andrew,
> I can't confirm a root reason based on your information, perhaps you may
> try to find a reason by yourself via the following docs:
>
> http://wiki.libvirt.org/page/PXE_boot_%28or_dhcp%29_on_guest_failed (Troubleshooting)
> http://docs.fedoraproject.org/en-US/Fedora/13/html/Virtualization_Guide/sect-Virtualization-Virtualized_guest_installation_overview-Installing_guests_with_PXE.html (User Guide)
Everything seems quite normal.
>
> If can't, please provide your version of kvm, libvirt, tftp, etc, and run 'virsh net-dumpxml br0' to dump your
> network bridge XML configuration, and run 'cat pxelinux.cfg' to show your pxelinux configuration, thanks.
default is my pxelinux configuration but I'm not sure is this is what your after.
dhcp is a protocol decode of the DHCP traffic. You see that the VM is sending each request twice which is a bit odd.
[root@node002 ~]# yum list | grep qemu
gpxe-roms-qemu.noarch 0.9.7-6.9.el6 @base
qemu-img.x86_64 2:0.12.1.2-2.295.el6_3.1 @updates
qemu-kvm.x86_64 2:0.12.1.2-2.295.el6_3.1 @updates
qemu-guest-agent.x86_64 2:0.12.1.2-2.295.el6_3.1 updates
qemu-kvm-tools.x86_64 2:0.12.1.2-2.295.el6_3.1 updates
br0 is created by brctl. There is not XML config as far as I am aware.
[root@node002 ~]# ifconfig br0
br0 Link encap:Ethernet HWaddr 00:9C:02:24:1A:E0
inet addr:10.141.80.2 Bcast:10.141.255.255 Mask:255.255.0.0
inet6 addr: fe80::29c:2ff:fe24:1ae0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:185129 errors:0 dropped:0 overruns:0 frame:0
TX packets:2094 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:8820359 (8.4 MiB) TX bytes:123842 (120.9 KiB)
[root@node002 ~]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:02:C9:36:21:A1
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
[root@node002 ~]# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.009c02241ae0 no eth1
vnet0
virbr0 8000.525400a6d5aa yes virbr0-nic
>
> --
> Regards,
> Alex
>
>
> ----- Original Message -----
> From: "Andrew Holway" <a.holway@xxxxxxxxxxxx>
> To: kvm@xxxxxxxxxxxxxxx
> Sent: Thursday, August 16, 2012 8:25:35 PM
> Subject: [libvirt-users] vm pxe fail
>
> Hallo
>
> I have a kvm vm that I am attempting to boot from pxe. The dhcp works perfectly and I can see the VM in the pxe server arp. but the tftp just times out. I don't see any tftp traffic on either the physical host or on the pie server. I am using a bridged interface. I have tried using several virtual nic drivers, several different mac addresses and several different ips. on the physical host I can get the pxelinux.0 file from the pxe server via tftp and can clearly see that traffic with tcpdump.
>
> Ive tried using various virtual interfaces.
>
> I can pxe boot my physical hosts with no problems.
>
> I can tftp fine from the physical host and see the traffic with ethdump
>
> Here is the terminal output from the VM: https://dl.dropbox.com/u/98200887/Screen%20Shot%202012-08-15%20at%206.41.12%20PM.png
>
> Thanks,
>
> Andrew
>
> [root@node002 ~]# yum list | grep qemu
> gpxe-roms-qemu.noarch 0.9.7-6.9.el6 @base
> qemu-img.x86_64 2:0.12.1.2-2.295.el6_3.1 @updates
> qemu-kvm.x86_64 2:0.12.1.2-2.295.el6_3.1 @updates
> qemu-guest-agent.x86_64 2:0.12.1.2-2.295.el6_3.1 updates
> qemu-kvm-tools.x86_64 2:0.12.1.2-2.295.el6_3.1 updates
>
> [root@node002 ~]# ethtool eth0
> Settings for eth0:
> Supported ports: [ TP ]
> Supported link modes: 10000baseT/Full
> Supports auto-negotiation: No
> Advertised link modes: 10000baseT/Full
> Advertised pause frame use: No
> Advertised auto-negotiation: No
> Speed: Unknown!
> Duplex: Unknown! (255)
> Port: Twisted Pair
> PHYAD: 0
> Transceiver: internal
> Auto-negotiation: off
> MDI-X: Unknown
> Supports Wake-on: g
> Wake-on: g
> Current message level: 0x00000014 (20)
> Link detected: no
>
> [root@node002 ~]# brctl show
> bridge name bridge id STP enabled interfaces
> br0 8000.009c02241ae0 no eth1
> vnet0
> virbr0 8000.525400a6d5aa yes virbr0-nic
>
> [root@node002 ~]# ethtool vnet0
> Settings for vnet0:
> Supported ports: [ ]
> Supported link modes:
> Supports auto-negotiation: No
> Advertised link modes: Not reported
> Advertised pause frame use: No
> Advertised auto-negotiation: No
> Speed: 10Mb/s
> Duplex: Full
> Port: Twisted Pair
> PHYAD: 0
> Transceiver: internal
> Auto-negotiation: off
> MDI-X: Unknown
> Current message level: 0xffffffa1 (-95)
> Link detected: yes
>
> <domain type='kvm'>
> <name>vm004</name>
> <uuid>4f03b09b-e834-bbf3-a6c2-1689f3156ef2</uuid>
> <memory unit='KiB'>2097152</memory>
> <currentMemory unit='KiB'>2097152</currentMemory>
> <vcpu placement='static'>2</vcpu>
> <os>
> <type arch='x86_64' machine='rhel6.3.0'>hvm</type>
> <boot dev='hd'/>
> </os>
> <features>
> <acpi/>
> <apic/>
> <pae/>
> </features>
> <clock offset='utc'/>
> <on_poweroff>destroy</on_poweroff>
> <on_reboot>restart</on_reboot>
> <on_crash>restart</on_crash>
> <devices>
> <emulator>/usr/libexec/qemu-kvm</emulator>
> <disk type='file' device='disk'>
> <driver name='qemu' type='raw' cache='none'/>
> <source file='/cm/shared/vm/vm004.img'/>
> <target dev='hda' bus='ide'/>
> <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> </disk>
> <disk type='block' device='cdrom'>
> <driver name='qemu' type='raw'/>
> <target dev='hdc' bus='ide'/>
> <readonly/>
> <address type='drive' controller='0' bus='1' target='0' unit='0'/>
> </disk>
> <controller type='usb' index='0'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
> </controller>
> <controller type='ide' index='0'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
> </controller>
> <interface type='bridge'>
> <mac address='00:00:00:00:00:0d'/>
> <source bridge='br0'/>
> <model type='rtl8139'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
> </interface>
> <serial type='pty'>
> <target port='0'/>
> </serial>
> <console type='pty'>
> <target type='serial' port='0'/>
> </console>
> <input type='mouse' bus='ps2'/>
> <graphics type='vnc' port='-1' autoport='yes'/>
> <video>
> <model type='cirrus' vram='9216' heads='1'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
> </video>
> <memballoon model='virtio'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
> </memballoon>
> </devices>
> </domain>
>
>
>
> _______________________________________________
> libvirt-users mailing list
> libvirt-users@xxxxxxxxxx
> https://www.redhat.com/mailman/listinfo/libvirt-users
# This is the Cluster Manager PXE configuration file.
#
# Note that every boot option should specify 'IPAPPEND 3', otherwise the
# ramdisk will fail.
#
# An optional kernel parameter 'INSTALLMODE' can be used to force a certain
# installmode.
#
# The CMDaemon will generate additional kernel parameters (if configured)
# and insert them between the CMDS rdblacklist=nouveau CMDE markers.
#
# There is also a possibility to try and boot the next device in the BIOS
# boot order. It can be specified as:
#
# LABEL disk
# localboot 0
# MENU LABEL ^BOOT - Boot next device in BIOS boot order.
#
# End of documentation, configuration follows:
LABEL linux
KERNEL vmlinuz
IPAPPEND 3
APPEND initrd=initrd CMDS rdblacklist=nouveau CMDE
MENU LABEL ^AUTO - Normal node boot
MENU DEFAULT
LABEL full
KERNEL vmlinuz
IPAPPEND 3
APPEND initrd=initrd CMDS rdblacklist=nouveau CMDE INSTALLMODE=FULL CANCELBURN=1
MENU LABEL ^FULL - Force FULL install (cancels burn)
MENU HIDE
LABEL main
KERNEL vmlinuz
IPAPPEND 3
APPEND initrd=initrd CMDS rdblacklist=nouveau CMDE INSTALLMODE=MAIN CANCELBURN=1
MENU LABEL MA^IN - Drop to maintenance shell
LABEL newburn
KERNEL vmlinuz
IPAPPEND 3
APPEND initrd=initrd CMDS rdblacklist=nouveau CMDE NEWBURN=1
MENU LABEL NEW^BURN - Force a new burn
MENU HIDE
LABEL manburn
KERNEL vmlinuz
IPAPPEND 3
APPEND initrd=initrd CMDS rdblacklist=nouveau CMDE NEWBURN=1 BURNMENUPAUSE=1
MENU LABEL ^MANBURN - Force a new burn (no menu timeout)
MENU HIDE
LABEL cancelburn
KERNEL vmlinuz
IPAPPEND 3
APPEND initrd=initrd CMDS rdblacklist=nouveau CMDE CANCELBURN=1
MENU LABEL ^CANCELBURN - Cancel the current burn
MENU HIDE
LABEL RESCUE
KERNEL kernel.rescue
MENU LABEL ^RESCUE - Start rescue environment
APPEND vga=normal initrd=rescue.rootfs.cgz root=/dev/ram0 rw nokeymap
LABEL localdrive
MENU LABEL ^DRIVE - Boot from first hard drive
KERNEL chain.c32
APPEND hd0
LABEL MEMTEST
KERNEL memtest
MENU LABEL MEM^TEST - Start Memtest86
LABEL MEMPLUS
KERNEL memtestplus
MENU LABEL MEM^PLUS - Start Memtest86+
INCLUDE bios/menu.conf
INCLUDE mpxe/minstall.conf
DEFAULT menu.c32
PROMPT 0
TIMEOUT 50
MENU TITLE Cluster Manager PXE Environment
MENU BACKGROUND bootlogo.png
MENU COLOR sel 7;37;40 #ff94cc31 #ff303030 all
MENU COLOR hotsel 1;7;37;40 #ff94cc31 #ff303030 all
MENU COLOR unsel 37;44 #ff78af00 #00000000 std
MENU COLOR hotkey 1;37;44 #ff94cc31 #00000000 std
MENU COLOR border 30;44 #ff78af00 #00000000 std
MENU COLOR title 1;36;44 #ff78af00 #00000000 std
MENU COLOR tabmsg 31;40 #ff78af00 #00000000 std
[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"
