Idle connection:

[root@blackmesa ~]# tcpdump -s0 -vni wlan0 port 53 and host 8.8.4.4
tcpdump: listening on wlan0, link-type EN10MB (Ethernet), capture size 65535 bytes
19:56:44.420524 IP (tos 0x0, ttl 45, id 61140, offset 0, flags [none], proto UDP (17), length 92)
8.8.4.4.53 > 192.168.2.102.58726: 64712 ServFail 0/0/1 (64)
19:56:45.321511 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 92)
192.168.2.102.58726 > 8.8.4.4.53: 14630+ [1au] NULL? pabqhjai.i.dfw1.dns.canhasinter.net. (64)
19:56:45.365951 IP (tos 0x0, ttl 45, id 8941, offset 0, flags [none], proto UDP (17), length 106)
8.8.4.4.53 > 192.168.2.102.58726: 6903 1/0/1 pabqhjaa.i.dfw1.dns.canhasinter.net. NULL (78)
19:56:46.366871 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 92)
192.168.2.102.58726 > 8.8.4.4.53: 22357+ [1au] NULL? pabqhjaq.i.dfw1.dns.canhasinter.net. (64)
19:56:46.404453 IP (tos 0x0, ttl 45, id 61141, offset 0, flags [none], proto UDP (17), length 106)
8.8.4.4.53 > 192.168.2.102.58726: 14630 1/0/1 pabqhjai.i.dfw1.dns.canhasinter.net. NULL (78)
19:56:47.405435 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 92)
192.168.2.102.58726 > 8.8.4.4.53: 30084+ [1au] NULL? pabqhjay.i.dfw1.dns.canhasinter.net. (64)
19:56:47.444256 IP (tos 0x0, ttl 45, id 57685, offset 0, flags [none], proto UDP (17), length 106)
8.8.4.4.53 > 192.168.2.102.58726: 22357 1/0/1 pabqhjaq.i.dfw1.dns.canhasinter.net. NULL (78)
19:56:48.445028 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 92)
192.168.2.102.58726 > 8.8.4.4.53: 37811+ [1au] NULL? pabqhjba.i.dfw1.dns.canhasinter.net. (64)
19:56:48.493124 IP (tos 0x0, ttl 45, id 57686, offset 0, flags [none], proto UDP (17), length 106)
8.8.4.4.53 > 192.168.2.102.58726: 30084 1/0/1 pabqhjay.i.dfw1.dns.canhasinter.net. NULL (78)
19:56:49.493430 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 92)
192.168.2.102.58726 > 8.8.4.4.53: 45538+ [1au] NULL? pabqhjbi.i.dfw1.dns.canhasinter.net. (64)
19:56:49.590591 IP (tos 0x0, ttl 45, id 9974, offset 0, flags [none], proto UDP (17), length 106)
8.8.4.4.53 > 192.168.2.102.58726: 37811 1/0/1 pabqhjba.i.dfw1.dns.canhasinter.net. NULL (78)
19:56:50.591430 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 92)
192.168.2.102.58726 > 8.8.4.4.53: 53265+ [1au] NULL? pabqhjbq.i.dfw1.dns.canhasinter.net. (64)
19:56:50.632826 IP (tos 0x0, ttl 45, id 8942, offset 0, flags [none], proto UDP (17), length 106)
8.8.4.4.53 > 192.168.2.102.58726: 45538 1/0/1 pabqhjbi.i.dfw1.dns.canhasinter.net. NULL (78)
19:56:51.633477 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 92)
192.168.2.102.58726 > 8.8.4.4.53: 60992+ [1au] NULL? pabqhjby.i.dfw1.dns.canhasinter.net. (64)
19:56:51.682577 IP (tos 0x0, ttl 45, id 57687, offset 0, flags [none], proto UDP (17), length 106)
8.8.4.4.53 > 192.168.2.102.58726: 53265 1/0/1 pabqhjbq.i.dfw1.dns.canhasinter.net. NULL (78)

$ ping -n 172.16.0.1 -c 1
PING 172.16.0.1 (172.16.0.1) 56(84) bytes of data.
64 bytes from 172.16.0.1: icmp_seq=1 ttl=64 time=57.9 ms

--- 172.16.0.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 57.923/57.923/57.923/0.000 ms

^ At the same time as:

[root@blackmesa ~]# tcpdump -s0 -vni wlan0 port 53 and host 8.8.4.4
tcpdump: listening on wlan0, link-type EN10MB (Ethernet), capture size 65535 bytes
20:02:07.324440 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 92)
192.168.2.102.58726 > 8.8.4.4.53: 50704+ [1au] NULL? paaihlla.i.dfw1.dns.canhasinter.net. (64)
20:02:07.398469 IP (tos 0x0, ttl 45, id 10491, offset 0, flags [none], proto UDP (17), length 106)
8.8.4.4.53 > 192.168.2.102.58726: 42977 1/0/1 paaihlky.i.dfw1.dns.canhasinter.net. NULL (78)
20:02:07.926178 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 194)
192.168.2.102.58726 > 8.8.4.4.53: 58431+ [1au] NULL? 0ibbp82M-J2hbM->M-nYM-VbglbM-^M-^4ypM-KLM-gnaM->M-@XbM-GM-bWM-BM-sM-T3M-azM-AM-ZM-uM-YcM-JM->ajM-`M-CFeyM-PbaM-NKw.iM-CIX4M-@PsM-IKYM-WEM-]GM-RPvM-HvQM-KUM-NM-h0M-XM-koM-UN3M-VngJXM-BM-hZdM->[email protected] (166)
20:02:07.983846 IP (tos 0x0, ttl 45, id 11383, offset 0, flags [none], proto UDP (17), length 197)
8.8.4.4.53 > 192.168.2.102.58726: 50704 1/0/1 paaihlla.i.dfw1.dns.canhasinter.net. NULL (169)
20:02:07.989015 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 92)
192.168.2.102.58726 > 8.8.4.4.53: 622+ [1au] NULL? paaqhlli.i.dfw1.dns.canhasinter.net. (64)
20:02:08.027448 IP (tos 0x0, ttl 45, id 10492, offset 0, flags [none], proto UDP (17), length 208)
8.8.4.4.53 > 192.168.2.102.58726: 58431 1/0/1 0ibbp82M-J2hbM->M-nYM-VbglbM-^M-^4ypM-KLM-gnaM->M-@XbM-GM-bWM-BM-sM-T3M-azM-AM-ZM-uM-YcM-JM->ajM-`M-CFeyM-PbaM-NKw.iM-CIX4M-@PsM-IKYM-WEM-]GM-RPvM-HvQM-KUM-NM-h0M-XM-koM-UN3M-VngJXM-BM-hZdM->[email protected] NULL (180)
20:02:09.028427 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 92)
192.168.2.102.58726 > 8.8.4.4.53: 8349+ [1au] NULL? paaqhllq.i.dfw1.dns.canhasinter.net. (64)
20:02:09.068148 IP (tos 0x0, ttl 45, id 18642, offset 0, flags [none], proto UDP (17), length 106)
8.8.4.4.53 > 192.168.2.102.58726: 622 1/0/1 paaqhlli.i.dfw1.dns.canhasinter.net. NULL (78)