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Hyper V Networking Problem

Posted on 2010-08-24
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Last Modified: 2013-11-06
Hi All,

Ive used virtual server 2005 for  a while now and never had any problems with networking,

but we've jus rented a new off site dedicated server with the intention of running virtual servers within it

ive installed hyper v and created 2 servers but i cant get them to see the outside world

when we got the server it had 6 ip addresses bound to its network adapter so i stripped 4 ( for use by virtual machines) and left the other two bound to the adapter

ive set up one of the ip addresses on the virtual server with the correct gateway and subnet mask, but no matter what i try i cannot see the outside world

is this the correct way to do this?
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Question by:Chrissalter
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woolnoir earned 500 total points
ID: 33508992
The networking is set of external on the virtual NIC properties for each VM ? ( just checking as ive seen it missed before).
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by:Chrissalter
ID: 33509024
yes, i can ping the host, and the host can ping the vm,

is it possible that there could be restrictions on the router? eg by mac address or something?
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Assisted Solution

by:woolnoir
woolnoir earned 500 total points
ID: 33509039
It could very well be ... have you tried pinging the default GW ?, something you may want to try is clearing the ARP cache of the host and checking with the host is they need to do the same on the switch.

windows 2008 - netsh interface ip delete arpcache
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Assisted Solution

by:woolnoir
woolnoir earned 500 total points
ID: 33509059
Can your VM's ping each other ? i'm trying to ascertain if the virtual networking is correct. Pinging the VM host doesn't indicate that external networking is working in all instances as the traffic isnt leaving the local NIC...
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by:Chrissalter
ID: 33509140
yes both VM's can ping each other and the host can ping both and vice versa

i have tried pinging the gateway but even the host machine gets "Request Timed Out" and the internet conn on the host is fine
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Author Comment

by:Chrissalter
ID: 33509372
Have found the issue while while reading through the support section of our server providers

the router is protected and will only allow traffic if the ip address matches the mac address

they are adding the records for me now
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Expert Comment

by:woolnoir
ID: 33509377
Do you have the IP addresses of anything which is on the local segment , maybe another machine on the same LAN - something that wont use the default GW to communicate with. Maybe try pinging something else on the LAN from the guest.. in theory this will test if the problem is with your host, or the default GW.
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Author Closing Comment

by:Chrissalter
ID: 33509380
Thankyou for the help
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Expert Comment

by:woolnoir
ID: 33509392
Fantastic - glad I could help, even if only by pointing you in the right areas.
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