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windows NLB troubleshoot

Hello

I had stuck at NLB problem few days. I enable multicast NLB and can ping within member self. But I can not ping from client within same subnet (layer 2) network.

I am on a vmware esxi 7 host. All server and client on same host.

below link said I don't need have any settings on vmware if use multicast.

https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/techpaper/implmenting_ms_network_load_balancing.pdf

for physical switch support multicast, I know mainly have below 2 settings.

  1. setup multiport mac

mac-address multiport mac-address interface interface_number to interface_number vlan vlan-id

  1. setup arp static

arp static IP-address mac-address

however, my test did not pass a router. it should work without any settings.

would you please guide me how to troubleshoot?
Very appreciate for your help.

200456-%E5%BE%AE%E4%BF%A1%E6%88%AA%E5%9B%BE-20220510104638.png


windows-server
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1 Answer

LimitlessTechnology-2700 avatar image
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LimitlessTechnology-2700 answered ScottGao-0030 commented

Hi there,

When using NLB in multicast or unicast mode, routers need to accept proxy ARP responses (IP-to-network address mappings that are received with a different network source address in the Ethernet frame).

Make sure that your router has proxy ARP support turned on. You can also set a static ARP entry to keep proxy ARP support disabled in the router.

In some cases internet control message protocol (ICMP) to the cluster is blocked by a router or firewall.Allow ICMP traffic through the router or firewall. Be aware that this may expose your system to additional security risk.



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Hello

Thanks for reply.
I had not complete provde But I believe reason vmx3 network adapter (10G speed) not support NLB. I install a new intel adapter (1G) then it will.
And I set a static ARP in gateway, then it can be route.
Thank you.

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