sunhux
asked on
VM occasionally unreachable / unpingable from outside network
We have 2 VMs sitting on different ESXi hosts which occasionally
became unpingable from another subnet/VLAN, giving either
"Request timed out" or "Destination Host Unreachable"
What troubleshooting scripts would you put in place & isolation
measures you would perform?
I've heard of cases where Win 2008 would lose its default gateway
& by a certain value in the registry, it solves the problem. I've
also come across a case of a Win 2008 IP address 'disappeared'
but after rebooting, it's Ok but not sure if this is the case we're
facing.
I was told by my colleague who is at the site (where the ESX hosts
are located) that usually the VMs self recovers & became pingable
(& could be rdp'ed in ) again after a while
became unpingable from another subnet/VLAN, giving either
"Request timed out" or "Destination Host Unreachable"
What troubleshooting scripts would you put in place & isolation
measures you would perform?
I've heard of cases where Win 2008 would lose its default gateway
& by a certain value in the registry, it solves the problem. I've
also come across a case of a Win 2008 IP address 'disappeared'
but after rebooting, it's Ok but not sure if this is the case we're
facing.
I was told by my colleague who is at the site (where the ESX hosts
are located) that usually the VMs self recovers & became pingable
(& could be rdp'ed in ) again after a while
SOLUTION
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ASKER
ipconfig/all in the VM gave the following:
As the ethernet adapter is showing as "Intel",
can I assume it's P2V'ed?
Just learnt from my colleague onsite that one of
the VM is not prompting for Windows 2008 licence
to be activated, hmm, sounds like fresh install?
(yep, 2 conflicting responses. We don't have
access to the vCenter; waiting for the customer
to return from meeting)
Windows IP Configuration
Host Name . . . . . . . . . . . . : MASMMWKST001
Primary Dns Suffix . . . . . . . : sxxs.sss.com.au
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : sxxs.sss.com.au
sss.com.au
com.au
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) 82566DM-2 Gigabit Network Connection
Physical Address. . . . . . . . . : 00-24-81-90-30-A2
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 10.167.254.98
Subnet Mask . . . . . . . . . . . : 255.255.254.0
Default Gateway . . . . . . . . . : 10.167.254.1
DNS Servers . . . . . . . . . . . : 10.168.2.197
10.168.28.127
10.168.2.32
10.168.2.196
Primary WINS Server . . . . . . . : 10.168.2.98
Secondary WINS Server . . . . . . : 10.168.2.99
As the ethernet adapter is showing as "Intel",
can I assume it's P2V'ed?
Just learnt from my colleague onsite that one of
the VM is not prompting for Windows 2008 licence
to be activated, hmm, sounds like fresh install?
(yep, 2 conflicting responses. We don't have
access to the vCenter; waiting for the customer
to return from meeting)
Windows IP Configuration
Host Name . . . . . . . . . . . . : MASMMWKST001
Primary Dns Suffix . . . . . . . : sxxs.sss.com.au
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : sxxs.sss.com.au
sss.com.au
com.au
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) 82566DM-2 Gigabit Network Connection
Physical Address. . . . . . . . . : 00-24-81-90-30-A2
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 10.167.254.98
Subnet Mask . . . . . . . . . . . : 255.255.254.0
Default Gateway . . . . . . . . . : 10.167.254.1
DNS Servers . . . . . . . . . . . : 10.168.2.197
10.168.28.127
10.168.2.32
10.168.2.196
Primary WINS Server . . . . . . . : 10.168.2.98
Secondary WINS Server . . . . . . : 10.168.2.99
ASKER CERTIFIED SOLUTION
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ASKER
Ok, the customer's vCenter admin has reverted:
It's VMXNET3 NICs & the 2 VMs are deployed from a Win2008 template (not P2V'ed).
We have also migrated/vMotioned of the VMs to another ESXi host & observe
for a while & it gives the same unpingable manifestation too
It's VMXNET3 NICs & the 2 VMs are deployed from a Win2008 template (not P2V'ed).
We have also migrated/vMotioned of the VMs to another ESXi host & observe
for a while & it gives the same unpingable manifestation too
ASKER
>migrated/vMotioned of the VMs
Typo, I meant "...migrated/vMotioned one of the VMs ..."
Anything to check on the Cisco network switch that the ESXi
hosts are connected to?
Typo, I meant "...migrated/vMotioned one of the VMs ..."
Anything to check on the Cisco network switch that the ESXi
hosts are connected to?
check your teaming, load balancing, vlans, config switch
ASKER
For ESXi hosts, don't think there's any teaming: we just
trunked the ports. Load balancing of the 2 VMs is using NLB
(Don't tell me it's a case of static ARP entries not defined in
the switches? Thought we'll only see VM disappearing from
NLB if static ARP entries are not defined in the switches)
What to look for in the VLANs & switch? do a "show interf"
to see if there's CRC errors or ??
trunked the ports. Load balancing of the 2 VMs is using NLB
(Don't tell me it's a case of static ARP entries not defined in
the switches? Thought we'll only see VM disappearing from
NLB if static ARP entries are not defined in the switches)
What to look for in the VLANs & switch? do a "show interf"
to see if there's CRC errors or ??
ASKER
Should I consider setting the VMNICs to E1000 ?
you could try it...
ASKER