First address of non-internal MACVLAN network not allocatable #50985
Description
Description
The first address of a MACVLAN network is not allocatable to containers, unless the network was created with --internal. This doesn't make sense, as external connectivity is provided by the parent interface, and so reserving the first address for some sort of "gateway" is wrong.
I suspect the same problem occues with IPVLAN, though I have yet to test it.
Reproduce
docker network create -d macvlan -o parent=eth0 --subnet=172.18.0.0/24 test
docker run --rm -it --net=test --ip=172.18.0.1 alpineIn particular, in docker network inspect test, there's no Gateway.
Expected behavior
An Alpine Linux container launches with IP address 172.18.0.1.
Instead Docker says:
docker: Error response from daemon: Address already in use.
and the container was not created.
docker version
Three Docker Engine instances tested:
<details>
<summary>1. Debian-provided `docker.io` on Trixie (26.1.5)</summary>
Client:
Version: 26.1.5+dfsg1
API version: 1.45
Go version: go1.24.4
Git commit: a72d7cd
Built: Wed Jul 30 19:37:00 2025
OS/Arch: linux/amd64
Context: default
Server:
Engine:
Version: 26.1.5+dfsg1
API version: 1.45 (minimum version 1.24)
Go version: go1.24.4
Git commit: 411e817
Built: Wed Jul 30 19:37:00 2025
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.7.24~ds1
GitCommit: 1.7.24~ds1-6+b4
runc:
Version: 1.1.15+ds1
GitCommit: 1.1.15+ds1-2+b4
docker-init:
Version: 0.19.0
GitCommit:
</details>
<details>
<summary>2. Ubuntu-provided `docker.io` on Noble (27.5.1)</summary>
Client:
Version: 27.5.1
API version: 1.47
Go version: go1.22.2
Git commit: 27.5.1-0ubuntu3~24.04.2
Built: Mon Jun 2 11:51:53 2025
OS/Arch: linux/amd64
Context: default
Server:
Engine:
Version: 27.5.1
API version: 1.47 (minimum version 1.24)
Go version: go1.22.2
Git commit: 27.5.1-0ubuntu3~24.04.2
Built: Mon Jun 2 11:51:53 2025
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.7.27
GitCommit:
runc:
Version: 1.2.5-0ubuntu1~24.04.1
GitCommit:
docker-init:
Version: 0.19.0
GitCommit:
</details>
<details>
<summary>3. Docker-provided `docker-ce` on Trixie (28.3.3)</summary>
Client: Docker Engine - Community
Version: 28.3.3
API version: 1.51
Go version: go1.24.5
Git commit: 980b856
Built: Fri Jul 25 11:34:13 2025
OS/Arch: linux/amd64
Context: default
Server: Docker Engine - Community
Engine:
Version: 28.3.3
API version: 1.51 (minimum version 1.24)
Go version: go1.24.5
Git commit: bea959c
Built: Fri Jul 25 11:34:13 2025
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.7.27
GitCommit: 05044ec0a9a75232cad458027ca83437aae3f4da
runc:
Version: 1.2.5
GitCommit: v1.2.5-0-g59923ef
docker-init:
Version: 0.19.0
GitCommit: de40ad0
</details>docker info
Three Docker Engine instances tested:
<details>
<summary>1. Debian-provided `docker.io` on Trixie (26.1.5)</summary>
Client:
Version: 26.1.5+dfsg1
Context: default
Debug Mode: false
Server:
Containers: 0
Running: 0
Paused: 0
Stopped: 0
Images: 1
Server Version: 26.1.5+dfsg1
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Using metacopy: false
Native Overlay Diff: true
userxattr: false
Logging Driver: json-file
Cgroup Driver: systemd
Cgroup Version: 2
Plugins:
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
Swarm: inactive
Runtimes: io.containerd.runc.v2 runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 1.7.24~ds1-6+b4
runc version: 1.1.15+ds1-2+b4
init version:
Security Options:
apparmor
seccomp
Profile: builtin
cgroupns
Kernel Version: 6.12.41+deb13-cloud-amd64
Operating System: Debian GNU/Linux 13 (trixie)
OSType: linux
Architecture: x86_64
CPUs: 8
Total Memory: 15.36GiB
Name: localhost
ID: be2238d2-6081-4408-9aed-fb7e556153ac
Docker Root Dir: /var/lib/docker
Debug Mode: false
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: true
</details>
<details>
<summary>2. Ubuntu-provided `docker.io` on Noble (27.5.1)</summary>
Client:
Version: 27.5.1
Context: default
Debug Mode: false
Plugins:
buildx: Docker Buildx (Docker Inc.)
Version: 0.20.1
Path: /usr/libexec/docker/cli-plugins/docker-buildx
compose: Docker Compose (Docker Inc.)
Version: 2.33.0+ds1-0ubuntu1~24.04.1
Path: /usr/libexec/docker/cli-plugins/docker-compose
Server:
Containers: 11
Running: 10
Paused: 0
Stopped: 1
Images: 48
Server Version: 27.5.1
Storage Driver: overlay2
Backing Filesystem: zfs
Supports d_type: true
Using metacopy: false
Native Overlay Diff: true
userxattr: false
Logging Driver: json-file
Cgroup Driver: systemd
Cgroup Version: 2
Plugins:
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
Swarm: inactive
Runtimes: io.containerd.runc.v2 runc
Default Runtime: runc
Init Binary: docker-init
containerd version:
runc version:
init version:
Security Options:
apparmor
seccomp
Profile: builtin
cgroupns
Kernel Version: 6.8.0-78-generic
Operating System: Ubuntu 24.04.3 LTS
OSType: linux
Architecture: x86_64
CPUs: 32
Total Memory: 125.7GiB
Name: localhost
ID: 1041d153-ba77-488f-8341-9df7242429ba
Docker Root Dir: /srv/docker
Debug Mode: false
Username: localhost
Experimental: false
Insecure Registries:
127.0.0.0/8
Registry Mirrors:
https://registry-1.docker.io/
Live Restore Enabled: true
Default Address Pools:
Base: 172.17.2.0/23, Size: 28
Base: fd00::10:0:0:0/76, Size: 80
</details>
<details>
<summary>3. Docker-provided `docker-ce` on Trixie (28.3.3)</summary>
Client: Docker Engine - Community
Version: 28.3.3
Context: default
Debug Mode: false
Plugins:
buildx: Docker Buildx (Docker Inc.)
Version: v0.26.1
Path: /usr/libexec/docker/cli-plugins/docker-buildx
compose: Docker Compose (Docker Inc.)
Version: v2.39.1
Path: /usr/libexec/docker/cli-plugins/docker-compose
Server:
Containers: 0
Running: 0
Paused: 0
Stopped: 0
Images: 8
Server Version: 28.3.3
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Using metacopy: false
Native Overlay Diff: true
userxattr: false
Logging Driver: json-file
Cgroup Driver: systemd
Cgroup Version: 2
Plugins:
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
CDI spec directories:
/etc/cdi
/var/run/cdi
Swarm: inactive
Runtimes: io.containerd.runc.v2 runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 05044ec0a9a75232cad458027ca83437aae3f4da
runc version: v1.2.5-0-g59923ef
init version: de40ad0
Security Options:
apparmor
seccomp
Profile: builtin
cgroupns
Kernel Version: 6.12.41+deb13-cloud-amd64
Operating System: Debian GNU/Linux 13 (trixie)
OSType: linux
Architecture: x86_64
CPUs: 32
Total Memory: 62.64GiB
Name: localhost
ID: 35c95837-943f-4f19-bfe6-9b16a5b94b15
Docker Root Dir: /data00/docker
Debug Mode: false
Experimental: false
Insecure Registries:
::1/128
127.0.0.0/8
Live Restore Enabled: true
</details>Additional Info
No response