Forum Discussion
DNS Lookup
Playing with the following rule trying to get DNS lookups working. Every time I hit the rule the name::response allways comes back empty. Any ideas what I am doing wrong. Thanks
when HTTP_RE...
Hey aaron,
Yep, if i do a dig @VIP from the Bigip CLI (or from an external client) this works. but within the iRule, the lookup times out...
I have a workaround where i set the resolve retries and timouts to be small and then sequentially try the next server if there is a failure i.e
set ips [RESOLV::lookup @$static::DNS_RESOLVER $host]
set _ipaddress [lindex $ips 0]
if {$_ipaddress eq "" }{
set ips [RESOLV::lookup @$static::DNS_RESOLVER_BACKUP $host]
set _ipaddress [lindex $ips 0]
}
It would be MUCH better if we could avoid the timeout and go directly to the working DNS server once Bigip has marked the other one down...
