NLB routes only to one host out of two, inside a local network

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sorry if duplicate post. googled no luck.

i have set nlb cluster 2 2008 r2 hosts, with of the ms guide.

cluster ip address: 192.168.113.159, subnet mask 255.255.255.0

host 1: 192.168.113.13, subnet mask 255.255.255.0

host 2: 192.168.113.160, subnet mask 255.255.255.0

cluster operation mode multicast; there 1 port rule which is for 192.168.113.159, ports 80 80; filtering mode multiple , affinity single.

the issue that when load test cluster on 192.168.113.159 ip using multiple client ips within same lan (for ex, 192.168.113.165, 192.168.113.166, 192.168.113.167 etc...) routing requests to 1 host. in host's iis log seeing requests of various client ips. the other host stays idle, iis log crispy clean -- not single request.

i tried changing multicast unicast -- no luck here.

just out of curiosity set affinity none and would successfully route requests both servers... which, unfortunately, not acceptable me because my application is stateful (runs under iis 7.5).

please let me know missing. going try hitting cluster using external client ips.... still internal ones should working too, suppose?

thank you

check out information nlb references in technet...

" algorithm not dynamically respond changes in load on each cluster host (such cpu load or memory usage). however, load distribution modified when cluster membership changes, , load percentages renormalized accordingly."

" mapping remains unchanged unless membership of cluster hosts changes, ensuring given clients ip address , port map same cluster host. however, particular cluster host clients ip address , port map cannot predetermined since randomization function takes account current , past clusters membership minimize remappings."

"as rule of thumb, client affinity set, there must @ least 5 times more clients cluster hosts begin observe load balance."

"the network load balancing client affinity settings implemented modifying statistical mapping algorithms input data. when client affinity selected in nlb properties dialog, clients port information not used part of mapping. hence, requests same client map same host within cluster. note constraint has no timeout value , persists until there change in cluster membership."

so facing normal windows nlb...

mcts, mcp


Windows Server  >  High Availability (Clustering)



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