dcaro added a comment.
For `wikidata-analytics-1`, it seems that there's a docker installation
there, that is reusing the same ranges that the cloud vps network uses, and the
traffic to the DNS server is being sent through the docker interface:
root@wikidata-analytics-1:/etc# grep nameserver /etc/resolv.conf
nameserver 172.20.255.1
root@wikidata-analytics-1:/etc# ip route get 172.20.255.1
172.20.255.1 dev br-f6fcafc9a433 src 172.20.0.1 uid 0
cache
root@wikidata-analytics-1:/etc# ip route show
default via 172.16.0.1 dev ens3
169.254.169.254 via 172.16.0.1 dev ens3
172.16.0.0/21 dev ens3 proto kernel scope link src 172.16.5.182
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown
172.18.0.0/16 dev br-6ae54cf5ea1c proto kernel scope link src 172.18.0.1
linkdown
172.19.0.0/16 dev br-4d14d798abd1 proto kernel scope link src 172.19.0.1
linkdown
172.20.0.0/16 dev br-f6fcafc9a433 proto kernel scope link src 172.20.0.1
linkdown
So for that I guess the solution is to change your docker configuration to
use a different range.
TASK DETAIL
https://phabricator.wikimedia.org/T354268
EMAIL PREFERENCES
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To: dcaro
Cc: AndrewTavis_WMDE, Aklapper, Manuel, Michael, dcaro, Danny_Benjafield_WMDE,
VeniVidiVicipedia, Astuthiodit_1, karapayneWMDE, Invadibot, Devnull, Slst2020,
maantietaja, nskaggs, Mohammed_Sadat_WMDE, Raymond_Ndibe, ItamarWMDE,
Akuckartz, Nandana, sietec, lucamauri, Lahi, Gq86, GoranSMilovanovic,
Chicocvenancio, QZanden, LawExplorer, Regisrob, _jensen, rosalieper,
Scott_WUaS, Wikidata-bugs, aude, Lydia_Pintscher, Mbch331, bd808
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