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Can't change bridge subnet or create network on Docker

Frod0n

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I would like to build a small infrastructure entirely under Linux. For the LDAP and file server part I would like to set up a Docker server that will host the OpenLDAP and Owncloud containers. I would like to have a 10.10.15.0/24 network for my Docker server and its containers.
This will give :
Srv_Docker : 10.10.15.10
OpenLDAP : 10.10.15.1
Owncloud : 10.10.15.5

It is impossible to create a network with the addressing 10.10.15.0/24 because it seems that there is already a network with this addressing.
Creating a network with subnet 10.10.15.0/24
docker network create --subnet 10.10.15.0/24 --gateway 10.10.15.254 test Error response from daemon: Pool overlaps with other one on this address space

ifconfig
ifconfig : docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 inet 10.10.15.1 netmask 255.255.0.0 broadcast 10.10.255.255 ether 02:42:99:46:57:11 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 10.10.15.10 netmask 255.255.255.0 broadcast 10.255.15.255 inet6 fe80::20c:29ff:fe1d:9bc9 prefixlen 64 scopeid 0x20<link> ether 00:0c:29:1d:9b:c9 txqueuelen 1000 (Ethernet) RX packets 183 bytes 13477 (13.4 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 81 bytes 9002 (9.0 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 19 base 0x2000


Network listing
Docker network ls NETWORK ID NAME DRIVER SCOPE 6769af814ca4 bridge bridge local 91992f85bf6d host host local 3d8f8aeefaf6 none null local

Bridge network display
docker inspect bridge : "Subnet": "10.10.0.0/16", "Gateway": "10.10.15.1"


Display OS version
cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=20.04 DISTRIB_CODENAME=focal DISTRIB_DESCRIPTION="Ubuntu 20.04.5 LTS"


Display docker version
docker version Version: 20.10.18

Do you have any idea how I could have the IP 10.10.15.1 & 10.10.15.5 on my containers while having the 10.10.15.10 address on my Docker host?
Thank you very much.
 
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