Confused about query_source(-v6) address statement

[Robert Senger]

Hi there,

I found these two inconsistent statements in the net about how bind9's
query_source_(-v6) address statements work: 

From: https://docstore.mik.ua/orelly/networking_2ndEd/dns/ch10_15.htm
"Note that query-source applies only to UDP-based queries; TCP-based
queries always choose the source address according to the routing table
and use a random source port."

From: https://www.dns-school.org/Documentation/bind-arm/Bv9ARM.ch06.html
"The address specified in the query-source option is used for both UDP
and TCP queries, but the port applies only to UDP queries. TCP queries
always use a random unprivileged port."

Which one is true? I only neet the source address to be set (both udp
and tcp, for source based routing of dns queries), not the port.

Thanks for clarification,

Robert


-- 
Robert Senger