I've recently setup a new Server 2008R2 Fail over Cluster running SQL 2008R2. I have been starting to see some intermittent networking issues and can't figure out how to fix it. the following are the available nics and their binding order.
Lan Team - 172.1.1.x/255.255.255.0
Local Area Connection* 9 - 169.x.x.x/255.255.0.0
HeartBeat - 192.168.x.x/255.255.255.0
San 0 - 172.1.2.x/255.255.255.0
San 1 - 172.1.2.x/255.255.255.0
San 2 - 172.1.2.x/255.255.255.0
mpio is configured to only use the SAN Netowrk.
On the active node, i'm intermittently loosing connection with the DC's and other lan servers. if i type nslookup from the command prompt, i get the usual "DNS request timed out" and DNS Server: Unknown. if i try to ping the ip of the DNS server or any other server on the lan network, i get "Destination Unreachable."
if i try to ping a public website, it works. the passive node doesn't seem to have these symptoms. i have not tried failing over yet, to see if the issues follow to the passive node.
anyone have any ideas what could cause this?
here is the ipconfig /all results for both nodes. the DC/DNS servers are 172.16.0.101 & 102. The lan team is configured as a Failover/Standby, so only 1 nic is active at a time, i even disabled the port on the switch to make sure and it didn't make a difference. there are 2 lan switches, each server has a nic connected to each. I just noticed that from other servers, the node ip's are pingable, but the cluster ip's are not? another thing i noticed, is that when doing a route print command, the metric on the 9* cluster adapter is the lowest metric, not sure if that makes a difference. lastly, from the switch interface, i can ping the cluster ip's. hope that helps? any info would be greatly appreciated.
Thanks for the information you have provided. I did not noticed any problems with your network connections but having a persistant route on a APIPA adapter does not sounds any good for me. I have also checked my test cluster's routes and i will share it with you. Note that normally I do not have any APIPA configured adapter, I disable them before creating cluster. I just enabled that adapter to produce an environmet that is close to your's. But there is still no route with APIPA.
IPv4 Route Table
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 10.6.88.126 10.6.88.67 261
10.6.88.64 255.255.255.192 On-link 10.6.88.67 261
10.6.88.66 255.255.255.255 On-link 10.6.88.67 261
10.6.88.67 255.255.255.255 On-link 10.6.88.67 261
10.6.88.127 255.255.255.255 On-link 10.6.88.67 261
127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
169.254.0.0 255.255.0.0 On-link 169.254.1.141 261
169.254.0.0 255.255.0.0 On-link 169.254.224.16 261
169.254.0.0 255.255.0.0 On-link 169.254.72.214 266
169.254.1.141 255.255.255.255 On-link 169.254.1.141 261
169.254.72.214 255.255.255.255 On-link 169.254.72.214 266
169.254.224.16 255.255.255.255 On-link 169.254.224.16 261
169.254.255.255 255.255.255.255 On-link 169.254.1.141 261
169.254.255.255 255.255.255.255 On-link 169.254.224.16 261
169.254.255.255 255.255.255.255 On-link 169.254.72.214 266
192.168.1.0 255.255.255.0 On-link 192.168.1.67 266
192.168.1.67 255.255.255.255 On-link 192.168.1.67 266
192.168.1.255 255.255.255.255 On-link 192.168.1.67 266
126.96.36.199 240.0.0.0 On-link 127.0.0.1 306
188.8.131.52 240.0.0.0 On-link 192.168.1.67 266
184.108.40.206 240.0.0.0 On-link 169.254.1.141 261
220.127.116.11 240.0.0.0 On-link 10.6.88.67 261
18.104.22.168 240.0.0.0 On-link 169.254.224.16 261
22.214.171.124 240.0.0.0 On-link 169.254.72.214 266
255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
255.255.255.255 255.255.255.255 On-link 192.168.1.67 266
255.255.255.255 255.255.255.255 On-link 169.254.1.141 261
255.255.255.255 255.255.255.255 On-link 10.6.88.67 261
255.255.255.255 255.255.255.255 On-link 169.254.224.16 261
255.255.255.255 255.255.255.255 On-link 169.254.72.214 266
Network Address Netmask Gateway Address Metric
0.0.0.0 0.0.0.0 10.6.88.126 Default
0.0.0.0 0.0.0.0 10.6.88.126 256
Anyway, I say you should disable *9 and delete the associated persistant route.
MCTS, 2008R2 Server Virtualization http://www.erkanaksoy.com
Thanks for the info, but not sure disabling that adapter is a good idea. i found this article that explains what that adapter is and why it's there. http://blogs.technet.com/b/askcore/archive/2009/02/13/what-is-a-microsoft-failover-cluster-virtual-adapter-anyway.aspx
however, this did lead me to look a little deeper into this adapter. it looks like this adapter has taken the mac address of one of the SAN nics, which is on a non-routable switch. none of our SAN switches have any access to the lan, which might explain why i'm getting errors that the server can't find our DC's and other servers.
also found this article http://support.microsoft.com/kb/973838, which showed me where the mac address is stored in the registry. i changed it to the Team adapter mac address on the passive node, and now the virtual adapter has the mac address of the team adapter after a reboot. unfortunately, the active node has some processes running on it and i can't reboot it yet. i'll post my results once i get a chance to reboot.
thanks for your help.