Xen users - Apr 2012 - VPS Dom U cannot ping from Dom0

Dear All,
I have a problem with my VPS machine ...I used Centos OS and xen application
:
- I created domU called vps1 with this configuration :
# more /etc/xen/vps1
kernel = "/usr/lib/xen/boot/hvmloader"
builder = ''hvm''
memory = 1536
name = "vps1"
vif = [
''bridge=xenbr0,ip=202.162.218.236,mac=00:16:3E:12:18:36'' ]
disk = [ ''phy:/dev/lpse/vps1,hda,w'' ]
device_model = ''/usr/lib64/xen/bin/qemu-dm''
pae=1
#boot = "cda"
#vnc = 1
#vnclisten = ''0.0.0.0''
#vncpasswd = ''linux''

- those configuration can running well but when i change ip address on dom0
and vps1, I have problem that i cannot access vps1 , i can''t ping vps1
:(
this configuration after changed :
# more /etc/xen/vps1
kernel = "/usr/lib/xen/boot/hvmloader"
builder = ''hvm''
memory = 1536
name = "vps1"
vif = [ ''bridge=xenbr0,ip=103.28.113.26,mac=00:16:3E:12:18:36''
]
disk = [ ''phy:/dev/lpse/vps1,hda,w'' ]
device_model = ''/usr/lib64/xen/bin/qemu-dm''
pae=1
#boot = "cda"
#vnc = 1
#vnclisten = ''0.0.0.0''
#vncpasswd = ''linux''


- access from xm console vps1 show message :
#xm console vps1
xenconsole: Could not read tty from store: No such file or directory


Can Help Me, Pleaseeee :(

Regards,
Nanang


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On Thu, 2012-04-19 at 08:55 +0100, nangnung wrote:
> - access from xm console vps1 show message :
> #xm console vps1
> xenconsole: Could not read tty from store: No such file or directory
You need to add
	serial = ''pty''
to cause the emulated serial device to be exposed such that xm console
can connect to it.

Ian.