BIND | Cname chain resolution using forward ( CNAME&A returned but no use A) (#3995)

[Yang]

hi bind admin,

 when i use bind-9.11 for my interdns， deviceip is 10.1.1.1, 

i config 

zone "bd.baidubce.com." 

 in { type forward ; forward only; forwarders { 10.10.10.10; }; };



 
1、when i dig @10.1.1.1 x.bd.bcebos.com. 

2、10.10.10.10 return record "CNAME bd.bcebos.com., A 100.67.96.26, A 100.67.96.27" to device10.1.1.1 

3、but device10.1.1.1 not return A 100.67.96.26, A 100.67.96.27 to me 

4、device10.1.1.1 go to qurey bd.bcebos.com. recursive itself，and get another record 110.242.70.8
 
i have questions 

1、why config is forward only， but bind get CNAME & A，bind do not return A to me，and query cname again itself？

 thanks
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