Bind can do recursive queries, like a client asking other servers on internet, look at the my server's asking (192.168.1.254 port 16599) to other external server (209.6.3.210 port 53) and the response below.
Code:
$ sudo tcpdump -n
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
20:19:21.732149 IP 192.168.1.254.16599 > 209.6.3.210.53: 3457 [1au] A? ubuntuforums.org. (45)
20:19:22.097599 IP 209.6.3.210.53 > 192.168.1.254.16599: 3457*- 1/3/4 A[|domain]
Recursive queries are default in bind.
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