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Ford, Toby

2006-Feb-10 01:04 UTC

[Xen-users] Seeing the IP addresses of domUs from dom0

Using a default xen3.0.1 setup for dom0(rhel4 distro) and domUs (gentoo,
rhel4, centos4.2 distros, ttylinux) with the domUs all having dhcp
turned on, is there an easy way to tell from within the dom0 what ip
addresses were assigned to the domUs after bootup?

Toby Ford
USi



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Anand Gupta

2006-Feb-10 05:10 UTC

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Re: [Xen-users] Seeing the IP addresses of domUs from dom0

On 2/10/06, Ford, Toby <Toby.Ford@usi.net> wrote:>
>
> Using a default xen3.0.1 setup for dom0(rhel4 distro) and domUs (gentoo,
> rhel4, centos4.2 distros, ttylinux) with the domUs all having dhcp
> turned on, is there an easy way to tell from within the dom0 what ip
> addresses were assigned to the domUs after bootup?
>
Sure, just specify the MAC id for each domU inside your config files. Then
for each MAC id specify an ip address in your dhcp config file. This way you
know which domU will have what ip.

--
regards,

Anand Gupta


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Ford, Toby

2006-Feb-10 14:12 UTC

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RE: [Xen-users] Seeing the IP addresses of domUs from dom0

>On 2/10/06, Ford, Toby <Toby.Ford@usi.net> wrote:
>>Using a default xen3.0.1 setup for dom0(rhel4 distro) and domUs
(gentoo,>>rhel4, centos4.2 distros, ttylinux) with the domUs all having dhcp
>>turned on, is there an easy way to tell from within the dom0 what ip
>>addresses were assigned to the domUs after bootup?
>
>Sure, just specify the MAC id for each domU inside your config files.Then >for each MAC id specify an ip address in your dhcp config file.
This way >you know which domU will have what ip.

That makes complete sense, if I controlled the dhcp. Unfortunately, in
this case I don''t control the dhcp server configuration.

I was looking for a way to determine the ip of a domU from the command
line of the dom0. I found that with ''xm list --long
<domid>'' I could see
some of the information that dhcp sets like gateway and netmask in the
section seen below, but the ip is always literally ''1.2.3.4''.
Seems like
a bug in xm.

(domain 
.....    
   (image
        (linux
            (kernel /boot/vmlinuz-2.6.12.6-xenU)
            (ramdisk /boot/initrd-2.6.12.6-xenU)
            (ip :1.2.3.4:10.25.7.1:255.255.255.0:vm1:eth0:dhcp)
            (root ''/dev/sda1 ro'')
            (args 4)
        )
    )

Toby

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Anand Gupta

2006-Feb-10 14:33 UTC

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Re: [Xen-users] Seeing the IP addresses of domUs from dom0

On 2/10/06, Ralf Schmitt <ibm.tivoli@arcor.de>
wrote:>
> with a MAC address entry in the domU configuration file it would
> also be possible to find the IP address in the arp table with the
> command:
>
>    arp -n
>
> on dom0 if you don''t want to add each domU to the dhcp
configuration.
>
> You should also have a look at the tool "arpwatch". It sends you
a mail
> if a new address appears.
>
> http://rpmseek.com/rpm-pl/arpwatch.html?hl=de&cx=857:A:80
>
> Maybe this works only in a routed xen network ...
>
This doesn''t work on my routed setup

arp -n
Address                  HWtype  HWaddress           Flags Mask
Iface
192.168.1.3              ether   00:09:5B:E6:3E:79   C
eth0
192.168.1.1              ether   00:A0:C5:9B:AE:1D   C
eth0
192.168.1.240            *       *                   MP
eth0

The ip 192.168.1.240 is of a domU and the HWaddress has a * in it.


--
regards,

Anand Gupta


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Anand Gupta

2006-Feb-10 15:36 UTC

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Re: [Xen-users] Seeing the IP addresses of domUs from dom0

I use the vif-route script and from the looks of your ifconfig it seems you
are using the bridged network. Along with this i am using the xen-kernel for
both dom0 and domU on the testing box.

On 2/10/06, Ralf Schmitt <ibm.tivoli@arcor.de>
wrote:>
>
> strange ... here is what I can see on my Notebook:
>
> [root@tivoli VM]# arp -n
> Address                  HWtype  HWaddress           Flags Mask
> Iface
> 172.20.0.2               ether   00:16:3E:6F:97:1B   C
> xenbr0
>
>
>
>
> There is only one VM on it (172.20.0.2) and I can''t see
> the interfaces of dom0, because this system is connected
> to the internet with a PCMCIA UMTS card (ppp) and the
> onboard network interface is not activated.
>
> [root@tivoli ~]# ifconfig
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           UP LOOPBACK RUNNING  MTU:16436  Metric:1
>           RX packets:132 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:132 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:40104 (39.1 KiB)  TX bytes:40104 (39.1 KiB)
>
> ppp0      Link encap:Point-to-Point Protocol
>           inet addr:10.129.193.159  P-t-P:10.64.64.64
> Mask:255.255.255.255
>           UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:400  Metric:1
>           RX packets:14416 errors:2578 dropped:0 overruns:0 frame:0
>           TX packets:14259 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:3
>           RX bytes:5371717 (5.1 MiB)  TX bytes:947051 (924.8 KiB)
>
> vif1.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:30 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:1788 (1.7 KiB)  TX bytes:916 (916.0 b)
>
> xenbr0    Link encap:Ethernet  HWaddr 36:8B:F9:95:5C:E8
>           inet addr:172.20.0.1  Bcast:172.20.255.255
> Mask:255.255.255.255
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:27 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:1284 (1.2 KiB)  TX bytes:916 (916.0 b)
>
>
> The ppp interface has no MAC address ... so this is OK
>
> I use NAT on it and I don''t have access to the server in my
> company at the moment ... maybe I was wrong ... I will have
> a look at it tomorrow.
>
>
> My "xm list --long" is in the attached file. It was to long to
> add it to the mail.
>
>
> I have also added the kernel configuration files of dom0 and
> domU.
>
>
> Regards
>
>   Ralf
>
>
> Anand Gupta wrote:
> > On 2/10/06, Ralf Schmitt <ibm.tivoli@arcor.de> wrote:
> >         with a MAC address entry in the domU configuration file it
> >         would
> >         also be possible to find the IP address in the arp table with
> >         the
> >         command:
> >
> >            arp -n
> >
> >         on dom0 if you don''t want to add each domU to the
dhcp
> >         configuration.
> >
> >         You should also have a look at the tool "arpwatch".
It sends
> >         you a mail
> >         if a new address appears.
> >
> >         http://rpmseek.com/rpm-pl/arpwatch.html?hl=de&cx=857:A:80
> >
> >         Maybe this works only in a routed xen network ...
> >
> > This doesn''t work on my routed setup
> >
> > arp -n
> > Address                  HWtype  HWaddress           Flags Mask
> > Iface
> > 192.168.1.3              ether   00:09:5B:E6:3E:79   C
> > eth0
> > 192.168.1.1              ether   00:A0:C5:9B:AE:1D   C
> > eth0
> > 192.168.1.240            *       *                   MP
> > eth0
> >
> > The ip 192.168.1.240 is of a domU and the HWaddress has a * in it.
> >
> >
> > --
> > regards,
> >
> > Anand Gupta
>
>
>

--
regards,

Anand Gupta


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Ralf Schmitt

2006-Feb-10 16:28 UTC

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Re: [Xen-users] Seeing the IP addresses of domUs from dom0

strange ... here is what I can see on my Notebook:

[root@tivoli VM]# arp -n
Address                  HWtype  HWaddress           Flags Mask
Iface
172.20.0.2               ether   00:16:3E:6F:97:1B   C
xenbr0




There is only one VM on it (172.20.0.2) and I can''t see
the interfaces of dom0, because this system is connected
to the internet with a PCMCIA UMTS card (ppp) and the 
onboard network interface is not activated. 

[root@tivoli ~]# ifconfig
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:132 errors:0 dropped:0 overruns:0 frame:0
          TX packets:132 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:40104 (39.1 KiB)  TX bytes:40104 (39.1 KiB)

ppp0      Link encap:Point-to-Point Protocol
          inet addr:10.129.193.159  P-t-P:10.64.64.64
Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:400  Metric:1
          RX packets:14416 errors:2578 dropped:0 overruns:0 frame:0
          TX packets:14259 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3
          RX bytes:5371717 (5.1 MiB)  TX bytes:947051 (924.8 KiB)

vif1.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:30 errors:0 dropped:0 overruns:0 frame:0
          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1788 (1.7 KiB)  TX bytes:916 (916.0 b)

xenbr0    Link encap:Ethernet  HWaddr 36:8B:F9:95:5C:E8
          inet addr:172.20.0.1  Bcast:172.20.255.255
Mask:255.255.255.255
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:27 errors:0 dropped:0 overruns:0 frame:0
          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1284 (1.2 KiB)  TX bytes:916 (916.0 b)


The ppp interface has no MAC address ... so this is OK

I use NAT on it and I don''t have access to the server in my 
company at the moment ... maybe I was wrong ... I will have
a look at it tomorrow.


My "xm list --long" is in the attached file. It was to long to 
add it to the mail.


I have also added the kernel configuration files of dom0 and 
domU.
 

Regards

  Ralf


Anand Gupta wrote:> On 2/10/06, Ralf Schmitt <ibm.tivoli@arcor.de> wrote:
>         with a MAC address entry in the domU configuration file it
>         would
>         also be possible to find the IP address in the arp table with
>         the
>         command:
>         
>            arp -n
>         
>         on dom0 if you don''t want to add each domU to the dhcp
>         configuration. 
>         
>         You should also have a look at the tool "arpwatch". It
sends
>         you a mail
>         if a new address appears.
>         
>         http://rpmseek.com/rpm-pl/arpwatch.html?hl=de&cx=857:A:80
>         
>         Maybe this works only in a routed xen network ...
> 
> This doesn''t work on my routed setup
> 
> arp -n
> Address                  HWtype  HWaddress           Flags Mask
> Iface 
> 192.168.1.3              ether   00:09:5B:E6:3E:79   C
> eth0
> 192.168.1.1              ether   00:A0:C5:9B:AE:1D   C
> eth0 
> 192.168.1.240            *       *                   MP
> eth0
> 
> The ip 192.168.1.240 is of a domU and the HWaddress has a * in it. 
> 
> 
> -- 
> regards,
> 
> Anand Gupta



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Bráulio Gergull

2006-Feb-10 17:20 UTC

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RE: [Xen-users] Seeing the IP addresses of domUs from dom0

On Feb 10, 2006 12:12 PM, "Ford, Toby" <Toby.Ford@usi.net>
wrote:
> I was looking for a way to determine the ip of a domU from the command
> line of the dom0. I found that with ''xm list --long
<domid>'' I could
> see
> some of the information that dhcp sets like gateway and netmask in the
> section seen below, but the ip is always literally
''1.2.3.4''. Seems
> like
> a bug in xm.
Maybe "arp -na" can help you.

rgrds,
Braulio Gergull


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Ford, Toby

2006-Feb-10 22:34 UTC

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RE: [Xen-users] Seeing the IP addresses of domUs from dom0

Running ''arp -an'' on my dom0 only shows me the MAC address of
the one connected physical interface I have. I tried specifying
''-i'' and get ...

arp: in 1 entries no match found.


Toby

-----Original Message-----
From: Bráulio Gergull [mailto:gergull@getnet.com.br] 
Sent: Friday, February 10, 2006 12:21 PM
To: Ford, Toby
Cc: Anand Gupta; xen-users@lists.xensource.com
Subject: RE: [Xen-users] Seeing the IP addresses of domUs from dom0

On Feb 10, 2006 12:12 PM, "Ford, Toby" <Toby.Ford@usi.net>
wrote:
> I was looking for a way to determine the ip of a domU from the command
> line of the dom0. I found that with ''xm list --long
<domid>'' I could
> see
> some of the information that dhcp sets like gateway and netmask in the
> section seen below, but the ip is always literally
''1.2.3.4''. Seems
> like
> a bug in xm.
Maybe "arp -na" can help you.

rgrds,
Braulio Gergull


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Anand Gupta

2006-Feb-11 08:39 UTC

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Re: [Xen-users] Seeing the IP addresses of domUs from dom0

On 2/11/06, Ford, Toby <Toby.Ford@usi.net> wrote:>
>
> Running ''arp -an'' on my dom0 only shows me the MAC
address of the one
> connected physical interface I have. I tried specifying
''-i'' and get ...
>
> arp: in 1 entries no match found.
>
Out of the box my route setup wasn''t working with xen, i had to hack
the
vif-route script to get it working. It was basically an arp entry which
helped. Thanks to the guys on the list.

It could be because of my hack the arp isn''t showing the MAC address
for the
domU''s.

--
regards,

Anand Gupta


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Bráulio "W. Gergull

2006-Feb-13 12:51 UTC

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RE: [Xen-users] Seeing the IP addresses of domUs from dom0

Hi Toby,

Em Sex, 2006-02-10 às 17:34 -0500, Ford, Toby escreveu:> Running ''arp -an'' on my dom0 only shows me the MAC
address of the one connected physical interface I have. I tried specifying
''-i'' and get ...
> 
> arp: in 1 entries no match found.
You can force arp discovery by pinging the broadcast, just before
issuing the arp command:

ping -b -c 5 255.255.255.255

arp -na

That should do the trick.




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Anand Gupta

2006-Feb-13 15:16 UTC

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Re: [Xen-users] Seeing the IP addresses of domUs from dom0

On 2/13/06, Bráulio W. Gergull <gergull@getnet.com.br>
wrote:>
> Hi Toby,
>
> Em Sex, 2006-02-10 às 17:34 -0500, Ford, Toby escreveu:
> > Running ''arp -an'' on my dom0 only shows me the MAC
address of the one
> connected physical interface I have. I tried specifying
''-i'' and get ...
> >
> > arp: in 1 entries no match found.
>
> You can force arp discovery by pinging the broadcast, just before
> issuing the arp command:
>
> ping -b -c 5 255.255.255.255
>
> arp -na
>
> That should do the trick.
>
Doesn''t work for me

? (192.168.1.1) at 00:A0:C5:9B:AE:1D [ether] on eth0
? (192.168.1.3) at 00:09:5B:E6:3E:79 [ether] on eth0
? (192.168.1.240) at * PERM PUP on eth0

.240 being domU.

Maybe its the arp command i use in my custom vif-route script.

arp -s 192.168.1.240 00:08:a1:50:fa:19 pub

00:08:a1:50:fa:19 is the mac of eth0 on dom0.

Any clues ?

--
regards,

Anand Gupta


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