When you install docker, by default it will create a bridged interface docker0 with a 172.17.0.0/16 subnet for container networking. It will also create a MASQUERADE rule on your POSTROUTING iptables chain for container NAT. If this subnet is being used elsewhere on your network, then you should change this default subnet to avoid losing connectivity to these other networks:
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gbolo

Security + DevOps Engineer

DevOps Engineer

Toronto