From VM cannot ping host or gateway

Question

Hi all,
I have installed Hyper-V 2012 R2 core of a brand new Dell Poweredge R720 server in core mode, no GUI.
Then a VM with Windows 2012 R2 VM with GUi has been created with Hyper-V manager, no problems there.
I used the Virtual Switch Manager to create a Virtual LAN adapter and selected the network card as an external type because I want to share the Hyper-V host network card.
I start the virtual machine, go into network connections, configure a static IP is the same subnet as the Hyper-V host, default gateway, DNS server etc.
When I try to ping the Hyper-V host or the router's default gateway, I get that it is unreachable.
If I try to ping the VM from the host same thing, unreachable.
I made sure to disable the Firewall in the Hyper-V host as well as the Virtual Machine for testing purposes.
What is the problem here?
I read somewhere on google that although the hyper-v host network config may appear fine, it might be messed up.
Also if you have more than 1 physical network adapter how to I select the correct index for the NIC in Hyperv manager Virtual switch manager?
Any responses will be greatly appreciated.
Thanks and regards
Alfred

Answer 1

I'll ask again for the output of ipconfig /all from the two machines you are testing.  It is a challenge to assist in debugging network issues when we can't see how the network is configured.
.:|:.:|:. tim
Hi Tim,
sorry for the delay in answering and also thanks for your reply.
I have worked out what the problem was.
When I created the Virtual Switch in Hyper-V manager, I picked the wrong physical network card.
In the Poweredge R720 there are 8 physical nics and I picked the one called Broadcom NetXtreme Gigabit Ethernet (not connected and hence the apipa IP address), when it should have been Broadcom NetXtreme Gigabit Ethernet #5.
I had to go into powershell and execute get-netadapter to get the lists of NICs and their status.
Then I decided to create a NIC team to increase the bandwidth and create a virtual nic to assign to my VMs.
Now everything is working OK:
This is the output of my ipconfig /all on the core server:
Windows IP Configuration
   Host Name . . . . . . . . . . . . : xxxhyperv1
   Primary Dns Suffix  . . . . . . . : xxxxxx.local
   Node Type . . . . . . . . . . . . : Broadcast
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : xxxxxx.local
Ethernet adapter vEthernet (Virtual Switch 1):
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Hyper-V Virtual Ethernet Adapter #2
   Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::15be:46cd:a1c7:e2e2%35(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.20.44(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.20.1
   DHCPv6 IAID . . . . . . . . . . . : 603503634
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-7E-5F-99-00-0A-F7-3E-FD-6
   DNS Servers . . . . . . . . . . . : 192.168.20.5
   NetBIOS over Tcpip. . . . . . . . : Enabled
Ethernet adapter SLOT 2 Port 2:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet #4
   Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
Ethernet adapter SLOT 2 Port 4:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet #3
   Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
Ethernet adapter SLOT 2 Port 1:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet #2
   Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
Ethernet adapter SLOT 2 Port 3:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet
   Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
Tunnel adapter isatap.{92F333A4-9638-4721-AD23-E23B6FAA6541}:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
   Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
Thanks and regards
Ipnotech