NLB and Subnets

Just a word of advice:
just because you're on 10.x.y.z does not automatically mean your IT guys really decided for subnet 255.0.0.0 (as class A would suggest). They might have also decided to go for something arbitrary as 255.255.254.0.

Important knowledge when you try to configure an NLB'd system and can't figure out why everything seems to work, except when you go outside.
Ping fails, telnet fails, ... server not reachable...

So,

  • check out the "normal" subnet mask that the machine gets assigned automatically by DHCP
  • change whatever NLB decided itself for the NLB subnet mask
  • add the gateway if it is empty

You're good to go...

Keywords:
Load Balancing, NLB, Windows Server, Redundancy, Failover, Microsoft

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