Setting Virtual Server to Load balance Windows DNS Server.

can you post the virtual server and pool configuration?

 b virtual (name) list
 b pool (name) list

by the way, you are aware of this, aren't you?

sol6143: UDP health monitor operation

there is nslookup and dig external monitor in the advanced design & config page.

External Monitor

b virtual Fasken_DNS_tcp_virtual_server list virtual Fasken_DNS_tcp_virtual_server { snat automap pool Fasken_DNS_pool destination 172.20.239.146:domain ip protocol tcp profiles Fasken_DNS_lan-optimized_tcp_profile {} }

b virtual Fasken_DNS_udp_virtual_server VIRTUAL ADDRESS 172.20.239.146 UNIT 1 | ARP enable | (cur, max, limit, tot) = (0, 2, 0, 908) | (pkts,bits) in = (908, 478128), out = (0, 0) +-> VIRTUAL Fasken_DNS_udp_virtual_server SERVICE domain | PVA acceleration none | (cur, max, limit, tot) = (0, 2, 0, 908) | (pkts,bits) in = (908, 478128), out = (0, 0) | requests (total) = 0 +-> POOL Fasken_DNS_pool LB METHOD member least conn MIN/CUR ACTIVE MEMBERS 0/1 | (cur, max, limit, tot) = (0, 4, 0, 908) | (pkts,bits) in = (908, 478128), out = (0, 0) +-> POOL MEMBER Fasken_DNS_pool/172.20.31.16:domain active,up | | addr session disabled priority 1 ratio 1 | | (cur, max, limit, tot) = (0, 2, 0, 69) | | (pkts,bits) in = (69, 36528), out = (0, 0) | | requests (total) = 0 +-> POOL MEMBER Fasken_DNS_pool/172.20.31.21:domain inactive,down | | addr session disabled priority 1 ratio 1 | | (cur, max, limit, tot) = (0, 0, 0, 0) | | (pkts,bits) in = (0, 0), out = (0, 0) | | requests (total) = 0 +-> POOL MEMBER Fasken_DNS_pool/172.20.31.22:domain active,up | session enabled priority 1 ratio 1 | (cur, max, limit, tot) = (0, 2, 0, 839) | (pkts,bits) in = (839, 441600), out = (0, 0) | requests (total) = 0

b pool Fasken_DNS_pool list pool Fasken_DNS_pool { lb method member least conn monitor all Fasken_DNS_monitor members { 172.20.31.16:domain { priority 1 } 172.20.31.21:domain { priority 1 } 172.20.31.22:domain { priority 1 } } }

is 172.20.31.0/24 connected subnet?

if not, have you configured route for it?

from my bigip i can ping that subnet. from my bigip, the nodes configured are green, which means i can reach it... right ? from my client i can ping the VIP i created.

from my bigip i can ping that subnet. from my bigip, the nodes configured are green, which means i can reach it... right ? from my client i can ping the VIP i created.

in that case, can you try tcpdump?

 tcpdump -nni 0.0:nnn -s0 -w /var/tmp/output.pcap '(host 172.20.239.146 or host 172.20.31.16 or host 172.20.31.21 or host 172.20.31.22 and port 53)' or icmp -v

ok.. what should i be looking for once done ?

what should i be looking for once done ?

on each transaction, you should see 2 queries (one is from client to bigip and the other one is from bigip to server) and 2 answers (one is from server to bigip and the other one is from bigip to client).

This is a bit out my knowledge scope, what should i look for from here ?

Thanks.

must i run nslookup from the bigip also or from a machine with the VIp configured as preferred DNS ?

Is that what we are looking for ? 172.20.112.251 (my wks) 172.20.239.146 (VIP) 172.20.31.22 (DNS Server)