hyper-v guest cannot see host but can see everything else

hi, have windows 2008 host server 3 vm's. 1 of vm's can not see host machine. can see else on network including internet.

the other vm's on host can see host , else.

i've checked interface config and  route values , nothing out of ordinary.

initially had teamed interfaces , created virtual adaptor. had same issue unteamed 1 physical adaptor , created hyper-v adaptor use 1 host. made no difference.

this happened btw. prior we've had servers , running months.

we started having issues dns server, ( vm i'm having issues with). couldn't see issue decided see if teaming situation. ( teaming has worked nicely on our other 2 hosts). other vms on host work fine 1 still messed up.

i'm running out of ideas here. appreciated.

guest os:
windows ip configuration

   host name . . . . . . . . . . . . : testmail
   primary dns suffix  . . . . . . . : testmail.local
   node type . . . . . . . . . . . . : broadcast
   ip routing enabled. . . . . . . . : no
   wins proxy enabled. . . . . . . . : no
   dns suffix search list. . . . . . : testmail.local

ethernet adapter fe_ip-101:

   connection-specific dns suffix  . : testmail.local
   description . . . . . . . . . . . : microsoft virtual machine bus network adapter
   physical address. . . . . . . . . : 00-15-5d-a8-87-0b
   dhcp enabled. . . . . . . . . . . : no
   autoconfiguration enabled . . . . : yes
   autoconfiguration ip address. . . : 192.168.168.101
   subnet mask . . . . . . . . . . . : 255.255.255.0
   default gateway . . . . . . . . . : 192.168.168.168
   primary wins server . . . . . . . : 192.168.168.101
   secondary wins server . . . . . . : 192.168.168.100

ipv4 route table
===========================================================================
interface list
0x1 ........................... ms tcp loopback interface
0x2 ...00 15 5d a8 87 0b ...... microsoft virtual machine bus network adapter - network load balancing filter device
===========================================================================
===========================================================================
active routes:
network destination        netmask          gateway       interface  metric
          0.0.0.0          0.0.0.0  192.168.168.168  192.168.168.101      1
        127.0.0.0        255.0.0.0        127.0.0.1        127.0.0.1      1
    192.168.168.0    255.255.255.0  192.168.168.101  192.168.168.101     10
  192.168.168.101  255.255.255.255        127.0.0.1        127.0.0.1     10
  192.168.168.135  255.255.255.255  192.168.168.168  192.168.168.101      1
  192.168.168.255  255.255.255.255  192.168.168.101  192.168.168.101     10
        224.0.0.0        240.0.0.0  192.168.168.101  192.168.168.101     10
  255.255.255.255  255.255.255.255  192.168.168.101  192.168.168.101      1
default gateway:   192.168.168.168
===========================================================================
persistent routes:
  network address          netmask  gateway address  metric
          0.0.0.0          0.0.0.0  192.168.168.168       1

hi,

> can see else on network including internet.

so guest vm using external network, right? after install hyper-v server role, should create network hyper-v guest. create external network, should assign physical network card, , after create external network, system create virtual network adapter replace position of assigned physical nic. instead, physical nic run “microsoft virtual network switch protocol.

for assigned physical nic, have specified static ip? , new created virtual network adapter, how gets ip address? virtual network adapter have network connection physical computer?

please check , give feedback  for further troubleshooting, more information please refers following ms articles:

understanding hyper-v virtual networks
http://blogs.technet.com/b/apb/archive/2009/04/10/understanding-hyper-v-virtual-networks-part-2-private-vns.aspx
configuring virtual networks
http://technet.microsoft.com/en-us/library/cc816585(v=ws.10).aspx
configure networking
http://technet.microsoft.com/en-us/library/cc770380.aspx

---

lawrence

technet community support

Windows Server  >  Hyper-V