Load balance link Outbound with LTM+DNS?

Hi.

Yes, and more :-)

Type of LB that can interest your:

Kilobytes/Second:

BIG-IP DNS distributes DNS name resolution requests to the virtual server that is currently processing the fewest number of kilobytes per second. UseKilobytes/Second only with virtual servers for which BIG-IP DNS can collect the kilobytes per second metric.

Packet Rate:

BIG-IP DNS distributes DNS name resolution requests to the virtual server that is currently processing the fewest number of packets per second.

Quality of Service:

BIG-IP DNS distributes DNS name resolution requests to virtual servers based on a score assigned to each virtual server that is calculated from current performance metrics. Use Quality of Service only when you have configured BIG-IP DNS to calculate an overall score for each virtual server based on performance metrics.

You have more dynamic LB used by DNS module in the following link:

https://techdocs.f5.com/kb/en-us/products/big-ip-dns/manuals/product/bigip-dns-load-balancing-12-1-0/1.html#unique_1992515874

regards