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Stephen Liu

2008-Sep-19 05:34 UTC

[Xen-users] About MAC address

Hi folks,


Debian Etch
Xen


On cloning disk.img I suppose it also copies the MAC address of the
original image to the new image resulting in "ping hostname" unable to
find the new hostname.


Following is my test;

# dd if=/vserver/domains/xen5.satimis.com/disk.img
of=/vserver/domains/xen6.satimis.com/disk.img bs=4k

# dd if=/vserver/domains/xen5.satimis.com/swap.img
of=/vserver/domains/xen6.satimis.com/swap.img bs=4k


# xm list --long xen5.satimis.com
(domain
    (domid 3)
    (on_crash restart)
    (uuid e1074e82-9bbc-8fcd-2e74-e6ab66a3017d)
    (bootloader_args )
    (vcpus 1)
    (name xen5.satimis.com)
    (on_poweroff destroy)
    (on_reboot restart)
    (bootloader )
    (maxmem 32)
    (memory 32)
    (shadow_memory 0)
    (cpu_weight 256)
    (cpu_cap 0)
    (features )
    (on_xend_start ignore)
    (on_xend_stop ignore)
    (start_time 1221791564.86)
    (cpu_time 3.132796221)
    (online_vcpus 1)
    (image
        (linux
            (kernel /boot/vmlinuz-2.6.18-xen)
            (args ''root=/dev/hda1 ro '')
            (rtc_timeoffset 0)
            (notes
                (HV_START_LOW 4227858432)
                (FEATURES
                   
''writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel''
                )
                (VIRT_BASE 3221225472)
                (GUEST_VERSION 2.6)
                (PADDR_OFFSET 3221225472)
                (GUEST_OS linux)
                (HYPERCALL_PAGE 3222278144)
                (LOADER generic)
                (SUSPEND_CANCEL 1)
                (PAE_MODE no)
                (ENTRY 3222274048)
                (XEN_VERSION xen-3.0)
            )
        )
    )
    (status 2)
    (state -b----)
    (store_mfn 899538)
    (console_mfn 899537)
    (device
        (vif
            (uuid 18904eab-6d22-da74-79f0-c86198a01e4a)
            (script vif-bridge)
            (ip 192.168.0.115)
            (mac 00:16:3e:32:ab:e7)
            (type netfront)
            (backend 0)
        )
    )
    (device
        (vbd
            (uname file:/vserver/domains/xen5.satimis.com/disk.img)
            (uuid 505962e1-ddc4-7987-e731-eeda038c8ba1)
            (mode w)
            (dev hda1:disk)
            (backend 0)
            (bootable 1)
        )
    )
    (device
        (vbd
            (uname file:/vserver/domains/xen5.satimis.com/swap.img)
            (uuid c7e5ed00-fa70-3683-d66f-fba6feff5a69)
            (mode w)
            (dev hda2:disk)
            (backend 0)
            (bootable 0)
        )
    )
    (device
        (console
            (protocol vt100)
            (location 2)
            (uuid ca9ca5fb-9cee-6571-d064-83e2d8ddd894)
        )
    )
)
* end *



# xm list --long xen6.satimis.com
(domain
    (domid 2)
    (on_crash restart)
    (uuid 07a8b42b-acfd-ec79-ce19-83f843564db1)
    (bootloader_args )
    (vcpus 1)
    (name xen6.satimis.com)
    (on_poweroff destroy)
    (on_reboot restart)
    (bootloader )
    (maxmem 32)
    (memory 32)
    (shadow_memory 0)
    (cpu_weight 256)
    (cpu_cap 0)
    (features )
    (on_xend_start ignore)
    (on_xend_stop ignore)
    (start_time 1221791309.54)
    (cpu_time 3.313863599)
    (online_vcpus 1)
    (image
        (linux
            (kernel /boot/vmlinuz-2.6.18-xen)
            (args ''root=/dev/hda1 ro '')
            (rtc_timeoffset 0)
            (notes
                (HV_START_LOW 4227858432)
                (FEATURES
                   
''writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel''
                )
                (VIRT_BASE 3221225472)
                (GUEST_VERSION 2.6)
                (PADDR_OFFSET 3221225472)
                (GUEST_OS linux)
                (HYPERCALL_PAGE 3222278144)
                (LOADER generic)
                (SUSPEND_CANCEL 1)
                (PAE_MODE no)
                (ENTRY 3222274048)
                (XEN_VERSION xen-3.0)
            )
        )
    )
    (status 2)
    (state -b----)
    (store_mfn 888274)
    (console_mfn 888273)
    (device
        (vif
            (uuid bbc3e77d-e001-90f2-73f6-1d2a042c6e2b)
            (script vif-bridge)
            (ip 192.168.0.116)
            (mac 00:16:3e:0a:c0:fb)
            (type netfront)
            (backend 0)
        )
    )
    (device
        (vbd
            (uname file:/vserver/domains/xen6.satimis.com/disk.img)
            (uuid 8ea4ccb1-212e-8fea-0b17-dc056ae7f75d)
            (mode w)
            (dev hda1:disk)
            (backend 0)
            (bootable 1)
        )
    )
    (device
        (vbd
            (uname file:/vserver/domains/xen6.satimis.com/swap.img)
            (uuid 182adee0-bc90-69f2-a7e5-19fc3656e1ac)
            (mode w)
            (dev hda2:disk)
            (backend 0)
            (bootable 0)
        )
    )
    (device
        (console
            (protocol vt100)
            (location 2)
            (uuid dca93d80-8087-ed35-587d-dded9e45684f)
        )
    )
)
* end *


MAC Address

xen5.satimis.com :-
(mac 00:16:3e:32:ab:e7)


xen6.satimis.com
(mac 00:16:3e:0a:c0:fb)


# nano /etc/network/interfaces
making following change

iface eth0 inet static
 address 192.168.0.116 = mac 00:16:3e:0a:c0:fb
 gateway 192.168.0.1
 netmask 255.255.255.0


Remark:-

Also tried;
 address 192.168.0.116 = MAC of mac 00:16:3e:0a:c0:fb
 address 192.168.0.116 = 00:16:3e:0a:c0:fb
 address 192.168.0.116 = MAC of 00:16:3e:0a:c0:fb


None of them worked.


# /etc/init.d/networking restart
Reconfiguring network interfaces...=: Host name lookup failure
ifconfig: `--help'' gives usage information.
Failed to bring up eth0.
done.


# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:16:3E:0A:C0:FB
          inet addr:192.168.0.116  Bcast:192.168.0.255 
Mask:255.255.255.0
          inet6 addr: fe80::216:3eff:fe0a:c0fb/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:37 errors:0 dropped:0 overruns:0 frame:0
          TX packets:31 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:3154 (3.0 KiB)  TX bytes:3138 (3.0 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  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:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)


Please advise how to fix the problem.  TIA


B.R.
Stephen Liu

Send instant messages to your online friends http://uk.messenger.yahoo.com 

_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

Nemeth, Tamas

2008-Sep-19 09:02 UTC

head link

Re: [Xen-users] About MAC address

Hi!

Sorry, i don''t know anything about debian, but a mac address
in /etc/network/interfaces is strange for me.

It''s possibly for the domU to change the mac address of any virtual
interface by the command "ip link set ethX address XX:XX:XX:XX:XX:XX",
or similar. Xen will not notice the change. The mac address provided by
xen is like a default mac address of a real card, and can be changed
(until the next reboot of the domU). Maybe some script in you domU
system do this change during boot?

Anyway, the udev system may persistently link mac addresses and device
names (i.e. eth0, eth1). Take a look
at /etc/udev/rules.d/70-persistent-net.rules or something like this.


Bye,

Tamas


2008. 09. 19, péntek keltezéssel 13.34-kor Stephen Liu ezt
írta:> Hi folks,
> 
> 
> Debian Etch
> Xen
> 
> 
> On cloning disk.img I suppose it also copies the MAC address of the
> original image to the new image resulting in "ping hostname"
unable to
> find the new hostname.
> 
> 
> Following is my test;
> 
> # dd if=/vserver/domains/xen5.satimis.com/disk.img
> of=/vserver/domains/xen6.satimis.com/disk.img bs=4k
> 
> # dd if=/vserver/domains/xen5.satimis.com/swap.img
> of=/vserver/domains/xen6.satimis.com/swap.img bs=4k
> 
> 
> # xm list --long xen5.satimis.com
> (domain
>     (domid 3)
>     (on_crash restart)
>     (uuid e1074e82-9bbc-8fcd-2e74-e6ab66a3017d)
>     (bootloader_args )
>     (vcpus 1)
>     (name xen5.satimis.com)
>     (on_poweroff destroy)
>     (on_reboot restart)
>     (bootloader )
>     (maxmem 32)
>     (memory 32)
>     (shadow_memory 0)
>     (cpu_weight 256)
>     (cpu_cap 0)
>     (features )
>     (on_xend_start ignore)
>     (on_xend_stop ignore)
>     (start_time 1221791564.86)
>     (cpu_time 3.132796221)
>     (online_vcpus 1)
>     (image
>         (linux
>             (kernel /boot/vmlinuz-2.6.18-xen)
>             (args ''root=/dev/hda1 ro '')
>             (rtc_timeoffset 0)
>             (notes
>                 (HV_START_LOW 4227858432)
>                 (FEATURES
>                    
>
''writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel''
>                 )
>                 (VIRT_BASE 3221225472)
>                 (GUEST_VERSION 2.6)
>                 (PADDR_OFFSET 3221225472)
>                 (GUEST_OS linux)
>                 (HYPERCALL_PAGE 3222278144)
>                 (LOADER generic)
>                 (SUSPEND_CANCEL 1)
>                 (PAE_MODE no)
>                 (ENTRY 3222274048)
>                 (XEN_VERSION xen-3.0)
>             )
>         )
>     )
>     (status 2)
>     (state -b----)
>     (store_mfn 899538)
>     (console_mfn 899537)
>     (device
>         (vif
>             (uuid 18904eab-6d22-da74-79f0-c86198a01e4a)
>             (script vif-bridge)
>             (ip 192.168.0.115)
>             (mac 00:16:3e:32:ab:e7)
>             (type netfront)
>             (backend 0)
>         )
>     )
>     (device
>         (vbd
>             (uname file:/vserver/domains/xen5.satimis.com/disk.img)
>             (uuid 505962e1-ddc4-7987-e731-eeda038c8ba1)
>             (mode w)
>             (dev hda1:disk)
>             (backend 0)
>             (bootable 1)
>         )
>     )
>     (device
>         (vbd
>             (uname file:/vserver/domains/xen5.satimis.com/swap.img)
>             (uuid c7e5ed00-fa70-3683-d66f-fba6feff5a69)
>             (mode w)
>             (dev hda2:disk)
>             (backend 0)
>             (bootable 0)
>         )
>     )
>     (device
>         (console
>             (protocol vt100)
>             (location 2)
>             (uuid ca9ca5fb-9cee-6571-d064-83e2d8ddd894)
>         )
>     )
> )
> * end *
> 
> 
> 
> # xm list --long xen6.satimis.com
> (domain
>     (domid 2)
>     (on_crash restart)
>     (uuid 07a8b42b-acfd-ec79-ce19-83f843564db1)
>     (bootloader_args )
>     (vcpus 1)
>     (name xen6.satimis.com)
>     (on_poweroff destroy)
>     (on_reboot restart)
>     (bootloader )
>     (maxmem 32)
>     (memory 32)
>     (shadow_memory 0)
>     (cpu_weight 256)
>     (cpu_cap 0)
>     (features )
>     (on_xend_start ignore)
>     (on_xend_stop ignore)
>     (start_time 1221791309.54)
>     (cpu_time 3.313863599)
>     (online_vcpus 1)
>     (image
>         (linux
>             (kernel /boot/vmlinuz-2.6.18-xen)
>             (args ''root=/dev/hda1 ro '')
>             (rtc_timeoffset 0)
>             (notes
>                 (HV_START_LOW 4227858432)
>                 (FEATURES
>                    
>
''writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel''
>                 )
>                 (VIRT_BASE 3221225472)
>                 (GUEST_VERSION 2.6)
>                 (PADDR_OFFSET 3221225472)
>                 (GUEST_OS linux)
>                 (HYPERCALL_PAGE 3222278144)
>                 (LOADER generic)
>                 (SUSPEND_CANCEL 1)
>                 (PAE_MODE no)
>                 (ENTRY 3222274048)
>                 (XEN_VERSION xen-3.0)
>             )
>         )
>     )
>     (status 2)
>     (state -b----)
>     (store_mfn 888274)
>     (console_mfn 888273)
>     (device
>         (vif
>             (uuid bbc3e77d-e001-90f2-73f6-1d2a042c6e2b)
>             (script vif-bridge)
>             (ip 192.168.0.116)
>             (mac 00:16:3e:0a:c0:fb)
>             (type netfront)
>             (backend 0)
>         )
>     )
>     (device
>         (vbd
>             (uname file:/vserver/domains/xen6.satimis.com/disk.img)
>             (uuid 8ea4ccb1-212e-8fea-0b17-dc056ae7f75d)
>             (mode w)
>             (dev hda1:disk)
>             (backend 0)
>             (bootable 1)
>         )
>     )
>     (device
>         (vbd
>             (uname file:/vserver/domains/xen6.satimis.com/swap.img)
>             (uuid 182adee0-bc90-69f2-a7e5-19fc3656e1ac)
>             (mode w)
>             (dev hda2:disk)
>             (backend 0)
>             (bootable 0)
>         )
>     )
>     (device
>         (console
>             (protocol vt100)
>             (location 2)
>             (uuid dca93d80-8087-ed35-587d-dded9e45684f)
>         )
>     )
> )
> * end *
> 
> 
> MAC Address
> 
> xen5.satimis.com :-
> (mac 00:16:3e:32:ab:e7)
> 
> 
> xen6.satimis.com
> (mac 00:16:3e:0a:c0:fb)
> 
> 
> # nano /etc/network/interfaces
> making following change
> 
> iface eth0 inet static
>  address 192.168.0.116 = mac 00:16:3e:0a:c0:fb
>  gateway 192.168.0.1
>  netmask 255.255.255.0
> 
> 
> Remark:-
> 
> Also tried;
>  address 192.168.0.116 = MAC of mac 00:16:3e:0a:c0:fb
>  address 192.168.0.116 = 00:16:3e:0a:c0:fb
>  address 192.168.0.116 = MAC of 00:16:3e:0a:c0:fb
> 
> 
> None of them worked.
> 
> 
> # /etc/init.d/networking restart
> Reconfiguring network interfaces...=: Host name lookup failure
> ifconfig: `--help'' gives usage information.
> Failed to bring up eth0.
> done.
> 
> 
> # ifconfig
> eth0      Link encap:Ethernet  HWaddr 00:16:3E:0A:C0:FB
>           inet addr:192.168.0.116  Bcast:192.168.0.255 
> Mask:255.255.255.0
>           inet6 addr: fe80::216:3eff:fe0a:c0fb/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:37 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:31 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:3154 (3.0 KiB)  TX bytes:3138 (3.0 KiB)
> 
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:16436  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:0
>           RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
> 
> 
> Please advise how to fix the problem.  TIA
> 
> 
> B.R.
> Stephen Liu
> 
> Send instant messages to your online friends http://uk.messenger.yahoo.com 
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users

_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

Stephen Liu

2008-Sep-19 09:33 UTC

head link

Re: [Xen-users] About MAC address

--- "Nemeth, Tamas" <nice@titanic.nyme.hu> wrote:
> Hi!
> 
> Sorry, i don''t know anything about debian, but a mac address
> in /etc/network/interfaces is strange for me.
> 
> It''s possibly for the domU to change the mac address of any
virtual
> interface by the command "ip link set ethX address
> XX:XX:XX:XX:XX:XX",
> or similar. Xen will not notice the change. The mac address provided
> by
> xen is like a default mac address of a real card, and can be changed
> (until the next reboot of the domU). Maybe some script in you domU
> system do this change during boot?
> 
> Anyway, the udev system may persistently link mac addresses and
> device
> names (i.e. eth0, eth1). Take a look
> at /etc/udev/rules.d/70-persistent-net.rules or something like this. 

Hi Tamas,


I don''t have "70-persistent-net.rules" here.


# ls /etc/udev/rules.d/
020_permissions.rules       z25_persistent-net.rules
025_libgphoto2.rules        z45_persistent-net-generator.rules
025_libsane.rules           z50_run.rules
udev.rules                  z55_hotplug.rules
xen-backend.rules           z60_alsa-utils.rules
z20_persistent-input.rules  z60_xserver-xorg-input-wacom.rules
z20_persistent.rules        z75_cd-aliases-generator.rules
z25_persistent-cd.rules     z99_hal.rules
* end *


# cat /etc/udev/rules.d/z25_persistent-net.rules
....
# PCI device 0x10de:0x0373 (forcedeth)
SUBSYSTEM=="net", DRIVERS=="?*",
ATTRS{address}=="00:0e:a6:f9:a3:5b",
NAME="eth0"
* end *


There is only ONE NIC here.


$ cat /etc/udev/rules.d/z45_persistent-net-generator.rules
# These rules generate rules to keep network interface names unchanged
# across reboots write them to
/etc/udev/rules.d/z25_persistent-net.rules.
#
# The default name for this file is z45_persistent-net-generator.rules.

ACTION!="add",                         
GOTO="persistent_net_generator_end"
SUBSYSTEM!="net",                      
GOTO="persistent_net_generator_end"

# ignore the interface if a name has already been set
NAME=="?*",                            
GOTO="persistent_net_generator_end"

# ignore "secondary" raw interfaces of the madwifi driver
KERNEL=="ath*", ATTRS{type}=="802",    
GOTO="persistent_net_generator_end"

# provide nice comments for the generated rules
SUBSYSTEMS=="pci", \
 ENV{COMMENT}="PCI device $attr{vendor}:$attr{device}"
SUBSYSTEMS=="usb", \
 ENV{COMMENT}="USB device $attr{idVendor}:$attr{idProduct}"
SUBSYSTEMS=="ieee1394", \
 ENV{COMMENT}="Firewire device $attr{host_id}"
SUBSYSTEMS=="xen", \
 ENV{COMMENT}="Xen virtual device"
ENV{COMMENT}=="", \
 ENV{COMMENT}="Unknown $env{SUBSYSTEM} device ($env{DEVPATH})"
ATTRS{driver}=="?*", \
 ENV{COMMENT}="$env{COMMENT} ($attr{driver})"

# ignore interfaces without a driver link like bridges and VLANs
KERNEL=="eth*|ath*|wlan*|ra*|sta*", DRIVERS=="?*",\
        IMPORT{program}="write_net_rules $attr{address}"

ENV{INTERFACE_NEW}=="?*", NAME="$env{INTERFACE_NEW}"

LABEL="persistent_net_generator_end"
* end *


B.R.
Stephen 



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Xen users - Sep 2008 - About MAC address

[Xen-users] About MAC address

Re: [Xen-users] About MAC address

Re: [Xen-users] About MAC address