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both nics are configured with static IP addresses on the same subnet On NIC2, i have disabled dns registration and netbios. One of them is related to unicast. 1) Separating the front-end traffic from the back-end traffic (i.e Web server reeaquest by client from communication with Database) 2) Inter-host communication in unicast The prime function of the default gateway is exactly to help with that. But then you don't isolate & protect traffic that neatly and it will route to everywhere the default gateway can get. http://sauvblog.com/cannot-ping/cannot-ping-router-but-can-ping-other-computers.html

If you only need to route internally (i.e to reach the database or a client PC) we add the needed static persistent routes on the NLB NICs using the route command. Rowell Dionicio Hey Keith! Reply ↓ Brian on February 11, 2014 at 5:24 pm said: Not sure if anyone still looks at this but I have a weird issue: I have two 2008 R2 servers i cannot use ARP on my network..

Cannot Ping Nlb Cluster Ip From Different Subnet

You may also want to compare other flags to make sure both are configured identically. Instead if we add a proxy they are able to do so. Articles Authors Blogs Books Events FAQs Free Tools Hardware Links Message Boards Newsletter Software About Us : : Product Submission Form : Advertising Information ISAserver.org is in no way affiliated with Test what you really need and use only that.

In the following scenario, the client is on subnet 172.32.x.x/24 and the Windows Server 2003 NLB node is on subnet 172.33.x.x/24: Steps to see the scenario succeed when Windows Server 2003 The issue is that some routers are not happy when they are getting multicast MAC in response to the ARP request for a unicast IP. So, the NLB node does not get a response to the ARP request and the ping from the NLB Virtual IP Address fails as the NLB node fails to resolve the Kb960916 The link between the sites and the amount of traffic would be a pont of concern. "Youtube" like sounds like it could be heavy traffic going between places.

Join our community for more solutions or to ask questions. Nlb Host Unreachable I leave that as an exercise to the readers. Mike M. https://social.technet.microsoft.com/Forums/windows/en-US/39f5302a-9359-4d9b-9d76-7d97954d13c3/client-on-other-subnet-can-not-ping-nlb-vip?forum=winserverClustering The first time I encountered this issue I had to make a traffic capture to understand there was something wrong with ARP requests, because I could see that obviously the router

All rights reserved.Newsletter|Contact Us|Privacy Statement|Terms of Use|Trademarks|Site Feedback Skip links Skip to content Skip to footerPacket6Wireless ConsultantMain navigationAbout UsBlogResourcesWi-Fi DownloadsArchivesContact UsWindows Server NLB VIP Multicast Mode Through Cisco SwitchJanuary 19, 2015 Windows Nlb Across Subnets One of the worst things that can happen is that an issue messes up the proper functioning of the NLB itself. The only way i can ping the VIP is the following: 1. Any routes needed in the Private NIC subnet are added as persistent static routes.

Nlb Host Unreachable

Thanks! This explains why the router drops the packet. Cannot Ping Nlb Cluster Ip From Different Subnet Without the proper configuration on the switch you will not be able to connect to the Virtual IP address.This will not work because within the ARP request packet is a unicast Nlb Unicast Vs Multicast Rebooting one node might help but once you reboot ‘m both you run the risk of this happening and you really don’t want that.

This is a rather uncommon scenario on a windows server. http://sauvblog.com/cannot-ping/cannot-ping-dns-but-can-ip.html You have a simple firewall that NAT's from the NLB VIP = 10.10.10.100 to/from the Internet. A reboot caused all of this. Is there a parallel command in netsh? Cannot Ping Cluster Ip Address

So we prefer to play with static persistent routes in this case. If things are normal with ARP you should see an ARP request for the NLB VIP coming from the router and an ARP response coming from your NBL members every 30 Gateway is server wide, choice of NIC …….. Check This Out Any MAC address not on this list is dropped.

On 2012, both were configured to be "Multiple Host Affinity: None", but set to Single on 2008. Nlb Cluster Ip Not Reachable Install the tool on both NLB members, make a capture filter to just keep ARP protocol and start capture. Get 1:1 Help Now Advertise Here Enjoyed your answer?

NLB NIC:- C:Windows>netsh interface ipv4 show interface 26 Interface NLB Parameters ------------------------------- IfLuid : ethernet_17 IfIndex : 26 State : connected Metric : 10 Link MTU : 1500 bytes Reachable Time

Unicast mode would not have that problem. And naturally enabling forwarding will do the trick in this scenario as well, as this creates a weak host model. Just remember that traffic will also go to where ever that gateway routes, even to the internet. Nlb Multicast Everything went great except for 2 unexpected results. 1.

If not give the private NIC a lower metric to make it the most cost effective, so it is chosen over the other. Usually, filling the ARP cache with static ARP information is possible. each server has 2 nics, nic1(lan nic) and nic2(nlb nic). this contact form Externally/Internet I can't access OWA though I have NATed the public IP to the VIP of NLB.

Since these are all IIS websites, there are two port rules (for port 80 and 443). Your backend SQL server is also on 10.10.10.x. Server 1 and 2 are in an EMS array. I also hope this post may help someone else as you have helped me.

on January 20, 2011 at 1:39 am said: Many many kudos on this WNLB effort.