as below, IP address is keep change. So, customer wants to allow this URL only " image.watchon.cjem.skcdn.com" .
round-trip min/avg/max/stddev = 4.087/6.010/8.045/1.288 ms
SINMACF079HTDH:~ jilim$ ping image.watchon.cjem.skcdn.com
PING image.watchon.cjem.skcdn.com (211.110.212.66): 56 data bytes
64 bytes from 211.110.212.66: icmp_seq=0 ttl=57 time=8.566 ms
64 bytes from 211.110.212.66: icmp_seq=1 ttl=57 time=5.382 ms
64 bytes from 211.110.212.66: icmp_seq=2 ttl=57 time=7.669 ms
64 bytes from 211.110.212.66: icmp_seq=3 ttl=57 time=6.834 ms
^C
--- image.watchon.cjem.skcdn.com ping statistics ---
4 packets transmitted, 4 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 5.382/7.113/8.566/1.172 ms
SINMACF079HTDH:~ jilim$ ping image.watchon.cjem.skcdn.com
PING image.watchon.cjem.skcdn.com (121.156.105.170): 56 data bytes
64 bytes from 121.156.105.170: icmp_seq=0 ttl=53 time=6.666 ms
64 bytes from 121.156.105.170: icmp_seq=1 ttl=53 time=8.423 ms
64 bytes from 121.156.105.170: icmp_seq=2 ttl=53 time=10.876 ms
^C
--- image.watchon.cjem.skcdn.com ping statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 6.666/8.655/10.876/1.727 ms
SINMACF079HTDH:~ jilim$ ping image.watchon.cjem.skcdn.com
PING image.watchon.cjem.skcdn.com (121.156.105.170): 56 data bytes
64 bytes from 121.156.105.170: icmp_seq=0 ttl=53 time=5.745 ms
64 bytes from 121.156.105.170: icmp_seq=1 ttl=53 time=7.923 ms
64 bytes from 121.156.105.170: icmp_seq=2 ttl=53 time=24.452 ms
64 bytes from 121.156.105.170: icmp_seq=3 ttl=53 time=4.846 ms
^C
--- image.watchon.cjem.skcdn.com ping statistics ---
4 packets transmitted, 4 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 4.846/10.742/24.452/7.994 ms
SINMACF079HTDH:~ jilim$ ping image.watchon.cjem.skcdn.com
PING image.watchon.cjem.skcdn.com (110.45.211.29): 56 data bytes
64 bytes from 110.45.211.29: icmp_seq=0 ttl=54 time=5.840 ms
64 bytes from 110.45.211.29: icmp_seq=1 ttl=54 time=4.893 ms
64 bytes from 110.45.211.29: icmp_seq=2 ttl=54 time=8.397 ms
^C
--- image.watchon.cjem.skcdn.com ping statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 4.893/6.377/8.397/1.480 ms
SINMACF079HTDH:~ jilim$
SINMACF079HTDH:~ jilim$
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