Re: intermittent name resolution failures
On Fri, Dec 28, 2018 at 3:51 AM <tomas@tuxteam.de> wrote:
>
> Whenever your DNS fails try a "traceroute 8.8.8.8". Compare its results
> to what you get when you do it at times where your DNS works. Perhaps
> this sheds some light on it.
That is tough to capture because the problem is intermittent. When I
retry it seems to come back and vice versa. Instead I ran the
traceroute command 10 times and stored the output in trial_1.txt,
trial_2.txt, ... trial_10.txt in
http://kamaraju.xyz/tmp/network_issues/
Command used:
$ for i in `seq 1 10`; do traceroute 8.8.8.8 > trial_$i.txt; done
I see a lot of differences between trial_6.txt and trial_4.txt. Does
that mean anything or is this variation expected?
$ cat trial_6.txt
traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets
1 * * *
2 * * *
3 * * *
4 * * *
5 * * *
6 * be3295.ccr31.jfk05.atlas.cogentco.com (154.54.80.2) 2.131 ms
be3294.ccr31.jfk05.atlas.cogentco.com (154.54.47.218) 2.078 ms
7 level3.dfw03.atlas.cogentco.com (154.54.12.18) 1.905 ms 1.906 ms 2.038 ms
8 if-ae-12-2.tcore1.n75-new-york.as6453.net (66.110.96.5) 2.274 ms
2.271 ms if-ae-12-4.tcore1.n75-new-york.as6453.net (66.110.96.59)
2.257 ms
9 72.14.195.232 (72.14.195.232) 3.073 ms 3.074 ms *
10 * * *
11 * * *
12 * 108.170.235.183 (108.170.235.183) 2.605 ms 108.170.238.203
(108.170.238.203) 2.794 ms
13 google-public-dns-a.google.com (8.8.8.8) 2.182 ms 2.084 ms 2.044 ms
$ cat trial_4.txt
traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets
1 38.76.11.1 (38.76.11.1) 0.416 ms 0.359 ms 0.412 ms
2 gi0-2-0-6.rcr51.ewr04.atlas.cogentco.com (38.122.117.97) 1.213 ms
1.197 ms 1.208 ms
3 be3657.rcr21.ewr03.atlas.cogentco.com (154.24.33.169) 1.620 ms
1.514 ms 1.584 ms
4 be2601.rcr24.jfk01.atlas.cogentco.com (154.54.40.49) 2.044 ms * *
5 * * *
6 * be3294.ccr31.jfk05.atlas.cogentco.com (154.54.47.218) 2.205 ms
be3295.ccr31.jfk05.atlas.cogentco.com (154.54.80.2) 2.085 ms
7 level3.dfw03.atlas.cogentco.com (154.54.12.18) 1.674 ms 1.657 ms 1.745 ms
8 if-ae-12-2.tcore1.n75-new-york.as6453.net (66.110.96.5) 2.147 ms
2.232 ms if-ae-12-4.tcore1.n75-new-york.as6453.net (66.110.96.59)
2.181 ms
9 72.14.195.232 (72.14.195.232) 2.772 ms 2.766 ms 2.756 ms
10 * * *
11 * * 72.14.234.64 (72.14.234.64) 4.559 ms
12 209.85.243.193 (209.85.243.193) 2.346 ms 108.170.235.181
(108.170.235.181) 2.933 ms 74.125.37.97 (74.125.37.97) 2.650 ms
13 google-public-dns-a.google.com (8.8.8.8) 2.204 ms 2.200 ms 2.231 ms
thanks
raju
--
Kamaraju S Kusumanchi | http://raju.shoutwiki.com/wiki/Blog
Reply to: