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[public-dns-discuss] With Google Public DNS 8.8.8.8 the ratio of DNS requests to DNS response is high



Connectivity Tests: Very fine (no packet Loss)

Check the attached ping test results.

UGW DNS traffic KPI is abnormal, the number of DNS response is so less compared to the number requests ... check below graphical presentations.


DNS KPI.JPG













Network Design:

At the firewall, there is a NAT of Many Private IPs to a few Public IP.


We would like to know what is causing this less response to our many requests sent to Google DNS.

regards
Robert K M

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<KIN1UGW>
<KIN1UGW>
<KIN1UGW>
<KIN1UGW>
<KIN1UGW>ping -vpn-instance Gi -a 10.228.183.170 -c 50 8.8.8.8
  PING 8.8.8.8: 56  data bytes, press CTRL_C to break
    Reply from 8.8.8.8: bytes=56 Sequence=1 ttl=119 time=145 ms
    Reply from 8.8.8.8: bytes=56 Sequence=2 ttl=119 time=126 ms
    Reply from 8.8.8.8: bytes=56 Sequence=3 ttl=119 time=121 ms
    Reply from 8.8.8.8: bytes=56 Sequence=4 ttl=119 time=122 ms
    Reply from 8.8.8.8: bytes=56 Sequence=5 ttl=119 time=121 ms
    Reply from 8.8.8.8: bytes=56 Sequence=6 ttl=119 time=121 ms
    Reply from 8.8.8.8: bytes=56 Sequence=7 ttl=119 time=151 ms
    Reply from 8.8.8.8: bytes=56 Sequence=8 ttl=119 time=132 ms
    Reply from 8.8.8.8: bytes=56 Sequence=9 ttl=119 time=121 ms
    Reply from 8.8.8.8: bytes=56 Sequence=10 ttl=119 time=202 ms
    Reply from 8.8.8.8: bytes=56 Sequence=11 ttl=119 time=202 ms
    Reply from 8.8.8.8: bytes=56 Sequence=12 ttl=119 time=141 ms
    Reply from 8.8.8.8: bytes=56 Sequence=13 ttl=119 time=165 ms
    Reply from 8.8.8.8: bytes=56 Sequence=14 ttl=119 time=144 ms
    Reply from 8.8.8.8: bytes=56 Sequence=15 ttl=119 time=121 ms
    Reply from 8.8.8.8: bytes=56 Sequence=16 ttl=119 time=133 ms
    Reply from 8.8.8.8: bytes=56 Sequence=17 ttl=119 time=163 ms
    Reply from 8.8.8.8: bytes=56 Sequence=18 ttl=119 time=153 ms
    Reply from 8.8.8.8: bytes=56 Sequence=19 ttl=119 time=179 ms
    Reply from 8.8.8.8: bytes=56 Sequence=20 ttl=119 time=170 ms
    Reply from 8.8.8.8: bytes=56 Sequence=21 ttl=119 time=162 ms
    Reply from 8.8.8.8: bytes=56 Sequence=22 ttl=119 time=126 ms
    Reply from 8.8.8.8: bytes=56 Sequence=23 ttl=119 time=138 ms
    Reply from 8.8.8.8: bytes=56 Sequence=24 ttl=119 time=146 ms
    Reply from 8.8.8.8: bytes=56 Sequence=25 ttl=119 time=123 ms
    Reply from 8.8.8.8: bytes=56 Sequence=26 ttl=119 time=145 ms
    Reply from 8.8.8.8: bytes=56 Sequence=27 ttl=119 time=129 ms
    Reply from 8.8.8.8: bytes=56 Sequence=28 ttl=119 time=123 ms
    Reply from 8.8.8.8: bytes=56 Sequence=29 ttl=119 time=138 ms
    Reply from 8.8.8.8: bytes=56 Sequence=30 ttl=119 time=121 ms
    Reply from 8.8.8.8: bytes=56 Sequence=31 ttl=119 time=121 ms
    Reply from 8.8.8.8: bytes=56 Sequence=32 ttl=119 time=146 ms
    Reply from 8.8.8.8: bytes=56 Sequence=33 ttl=119 time=150 ms
    Reply from 8.8.8.8: bytes=56 Sequence=34 ttl=119 time=169 ms
    Reply from 8.8.8.8: bytes=56 Sequence=35 ttl=119 time=120 ms
    Reply from 8.8.8.8: bytes=56 Sequence=36 ttl=119 time=121 ms
    Reply from 8.8.8.8: bytes=56 Sequence=37 ttl=119 time=132 ms
    Reply from 8.8.8.8: bytes=56 Sequence=38 ttl=119 time=130 ms
    Reply from 8.8.8.8: bytes=56 Sequence=39 ttl=119 time=121 ms
    Reply from 8.8.8.8: bytes=56 Sequence=40 ttl=119 time=122 ms
    Reply from 8.8.8.8: bytes=56 Sequence=41 ttl=119 time=125 ms
    Reply from 8.8.8.8: bytes=56 Sequence=42 ttl=119 time=121 ms
    Reply from 8.8.8.8: bytes=56 Sequence=43 ttl=119 time=138 ms
    Reply from 8.8.8.8: bytes=56 Sequence=44 ttl=119 time=174 ms
    Reply from 8.8.8.8: bytes=56 Sequence=45 ttl=119 time=205 ms
    Reply from 8.8.8.8: bytes=56 Sequence=46 ttl=119 time=199 ms
    Reply from 8.8.8.8: bytes=56 Sequence=47 ttl=119 time=178 ms
    Reply from 8.8.8.8: bytes=56 Sequence=48 ttl=119 time=157 ms
    Reply from 8.8.8.8: bytes=56 Sequence=49 ttl=119 time=137 ms
    Reply from 8.8.8.8: bytes=56 Sequence=50 ttl=119 time=179 ms

  --- 8.8.8.8 ping statistics ---
    50 packet(s) transmitted
    50 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 120/144/205 ms

<KIN1UGW>