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Mode

Stub 

Recursive resolver

Software

ldns

(drill)

digit

getdns

(Stubby)

BIND

(dig)

Go
DNS 

Knot

(kdig)

getdns(a)

UnboundBIND

Knot

Res



TCP/TLS Features

TCP fast open(b)
(tick)

(tick)




P



(tick)
Connection reuse (Q/R, Q/R, Q/R)
(tick)

(tick)

(tick)(tick)(tick)

(tick)(tick)

Pipelining of queries(Q,Q,Q,R,R,R)

n/a(tick)

(tick)

(tick)(tick)(tick)

(tick)(tick)
Process OOOR (Q1,Q2,R2,R1)n/a (tick)

(tick)

(tick)



(tick)(tick)
EDNS0 Keepalive(c)

(tick)








TLS Features

TLS encryption (Port 853)
(tick)(tick)
(tick)(tick)(tick)(tick)

TLS authentication

(tick)






EDNS0 Padding
(tick)(tick)

(tick)



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