yum install tcpdump
tcpdump -i eth1 -vvv icmp
# dig gcloud.bst-1.cns.bstjpc.com @109.105.30.14
; <<>> DiG 9.9.4-RedHat-9.9.4-38.el7_3.3 <<>> gcloud.bst-1.cns.bstjpc.com @109.105.30.14
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54718
;; flags: qr aa rd ad; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1470
;; QUESTION SECTION:
;gcloud.bst-1.cns.bstjpc.com. IN A
;; ANSWER SECTION:
gcloud.bst-1.cns.bstjpc.com. 30 IN A 109.105.30.155
gcloud.bst-1.cns.bstjpc.com. 30 IN A 109.105.30.156
;; AUTHORITY SECTION:
bst-1.cns.bstjpc.com. 3600 IN NS cns.bst-1.bstjpc.com.
;; Query time: 4 msec
;; SERVER: 109.105.30.14#53(109.105.30.14)
;; WHEN: 五 4月 27 12:53:53 CST 2018
;; MSG SIZE rcvd: 112
