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  • "They are given IP address 172.19.0.2 and 172.19.0.3 so they are on the same bridge." - that's a false conclusion. They are in the same subnet but not necessarily on the same bridge. To check if they really are on the same bridge use brctrl show or bridge link Commented Sep 21, 2022 at 9:30
  • Are your containers on the same Docker network? Commented Sep 21, 2022 at 10:09