When i run tcpdump on the DSPACE server it is generating alot of DNS
queries. Is it normal ? Sometimes it increases to 10 queries per second.
What causes this ? any statistics module or anything else ? side note :
when i shutdown tomcat on the server dns queries stops.
tcpdump -vvv -n dst host 8.8.8.8
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 65535
bytes
12:50:54.963062 IP (tos 0x0, ttl 64, id 36065, offset 0, flags [DF], proto
UDP (17), length 72)
193.140.248.74.29530 > 8.8.8.8.domain: [bad udp cksum 1012!] 50042+
PTR? 114.66.249.66.in-addr.arpa. (44)
12:50:55.403481 IP (tos 0x0, ttl 64, id 36505, offset 0, flags [DF], proto
UDP (17), length 72)
193.140.248.74.57157 > 8.8.8.8.domain: [bad udp cksum 4018!] 20831+
PTR? 114.66.249.66.in-addr.arpa. (44)
12:50:55.507179 IP (tos 0x0, ttl 64, id 36609, offset 0, flags [DF], proto
UDP (17), length 72)
193.140.248.74.28586 > 8.8.8.8.domain: [bad udp cksum 65c0!] 6357+ PTR?
114.66.249.66.in-addr.arpa. (44)
12:50:56.043793 IP (tos 0x0, ttl 64, id 37146, offset 0, flags [DF], proto
UDP (17), length 72)
193.140.248.74.63576 > 8.8.8.8.domain: [bad udp cksum d302!] 19897+
PTR? 114.66.249.66.in-addr.arpa. (44)
12:50:56.126384 IP (tos 0x0, ttl 64, id 37228, offset 0, flags [DF], proto
UDP (17), length 69)
193.140.248.74.46604 > 8.8.8.8.domain: [bad udp cksum 3a9d!] 59462+
PTR? 16.9.88.77.in-addr.arpa. (41)
12:50:56.554399 IP (tos 0x0, ttl 64, id 37656, offset 0, flags [DF], proto
UDP (17), length 72)
193.140.248.74.57978 > 8.8.8.8.domain: [bad udp cksum a7de!] 34754+
PTR? 114.66.249.66.in-addr.arpa. (44)
12:50:56.681578 IP (tos 0x0, ttl 64, id 37783, offset 0, flags [DF], proto
UDP (17), length 72)
193.140.248.74.5296 > 8.8.8.8.domain: [bad udp cksum 29a2!] 37385+ PTR?
116.66.249.66.in-addr.arpa. (44)
12:50:56.974473 IP (tos 0x0, ttl 64, id 38076, offset 0, flags [DF], proto
UDP (17), length 72)
193.140.248.74.25179 > 8.8.8.8.domain: [bad udp cksum 1186!] 24694+
PTR? 116.66.249.66.in-addr.arpa. (44)
12:50:57.295146 IP (tos 0x0, ttl 64, id 38397, offset 0, flags [DF], proto
UDP (17), length 72)
193.140.248.74.4938 > 8.8.8.8.domain: [bad udp cksum 4505!] 12122+ PTR?
120.66.249.66.in-addr.arpa. (44)
12:50:57.622233 IP (tos 0x0, ttl 64, id 38724, offset 0, flags [DF], proto
UDP (17), length 72)
193.140.248.74.11070 > 8.8.8.8.domain: [bad udp cksum ac81!] 39930+
PTR? 114.66.249.66.in-addr.arpa. (44)
12:50:57.855780 IP (tos 0x0, ttl 64, id 38958, offset 0, flags [DF], proto
UDP (17), length 72)
193.140.248.74.4648 > 8.8.8.8.domain: [bad udp cksum 9755!] 57637+ PTR?
114.66.249.66.in-addr.arpa. (44)
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