Container showing as source IP

I’m using nginx inside a docker container.

A lot of entries in the access_log show as the source IP address, only a few show plausible IPs.

ifconfig shows that this is the IP address of an interface called br-d12e89b962b7:

 br-d12e89b962b7 Link encap:Ethernet  HWaddr 01:42:49:df:46:b6
      inet addr:  Bcast:  Mask:

Why does this interface forward packages for outside clients? I assume it is some kind of misconfiguration as it works sometimes.

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What other IPs do you see?

AFAIK you only see the IPAM gateway as the source IP as per