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[public-dns-discuss] Re: DNS Not reaching throughout my network



The traceroute you are seeing is perfectly normal and expected.

traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets
 1  gateway (103.92.200.1)  1.203 ms  1.639 ms  2.078 ms
 2  43.227.135.89 (43.227.135.89)  5.915 ms  6.280 ms  6.555 ms
 3  chennai-igw-172.232.249.45.powergrid.in (45.249.232.172)  5.910 ms  6.262 ms  6.503 ms

All of the addresses from the fourth hop onward are Google addresses
  • https://gwhois.org/72.14.209.113: range 72.14.192.0 – 72.14.255.255 allocated to Google.
  • https://gwhois.org/209.85.242.219: range 209.85.128.0 – 209.85.255.255 allocated to Google.
  • https://gwhois.org/216.239.63.213: range 216.239.32.0 – 216.239.63.255 allocated to Google 
 4  72.14.209.113 (72.14.209.113)  6.427 ms  6.434 ms  6.426 ms
 5  72.14.235.69 (72.14.235.69)  6.879 ms 209.85.242.219 (209.85.242.219)  6.692 ms  6.706 ms
 6  216.239.63.213 (216.239.63.213)  40.238 ms 209.85.252.112 (209.85.252.112)  38.430 ms 216.239.48.71 (216.239.48.71)  39.291 ms
 7  216.239.40.227 (216.239.40.227)  38.005 ms 216.239.48.209 (216.239.48.209)  38.061 ms 216.239.47.243 (216.239.47.243)  39.198 ms

The missing responses could be from internal devices at Google that have private (unroutable) IP addresses (e.g. 10.x.x.x or 100.64.x.x – 100.127.x.x) or may be blocked filtering on the outbound UDP packets sent by traceroute or the ICMP responses (private addresses would cause the latter).

 8  * * *
 9  * * *
10  * * *
11  * * *
12  * * *
13  * * *
14  * * *
15  * * *
16  * * *
17  google-public-dns-a.google.com (8.8.8.8)  39.601 ms  38.036 ms  39.231 ms

At this point, you are getting good (~40ms) latency to 8.8.8.8 so you don't have a problem.

You can see similar traces with equivalent drops if you put in 8.8.8.8 on the traceroute form at http://www.monitis.com/traceroute/.

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