Unable to access docker swarm services if external client IP is same as ingress network broadcast address

Description

When trying to access resources hosted on a docker swarm ingress network (i.e. 10.0.0.0/24), if the client has the IP same as broadcast of the ingress network (i.e. 10.0.0.255), it is unable to access anything hosted on the docker swarm

Steps to reproduce the issue:

1. ingress network with IP address which is a subset of LAN network.
2. have non-swarm client with IP address same as broadcast address of ingress network
3. setup service with externally accessable ports

Describe the results you received:
Unable to access any services hostsed on docker swarm network.

Describe the results you expected:
Able to access resources hosted on docker swarm

Additional information you deem important (e.g. issue happens only occasionally):

Wireshark packet capture shows the TCP connections are not even being responded to by any swarm node.

Output of docker network inspect ingress

[
    {
        "Name": "ingress",
        "Id": "kpu8i0gi6t71fsquozbrek7lq",
        "Created": "2021-05-02T00:44:06.787200553Z",
        "Scope": "swarm",
        "Driver": "overlay",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": [
                {
                    "Subnet": "10.0.0.0/24",
                    "Gateway": "10.0.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": true,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "6c85dcd4040115e4085d69239473d5ab17c1746296e9d03ba65611acba05ada7": {
                "Name": "mediawiki_mediawiki.2.plg9hn0aqdhrljkgehf8q2f5y",
                "EndpointID": "ed3a92f72ebb19b6fbf3df77497dbb988dfbab30d80305554625be70f69e1e0f",
                "MacAddress": "02:42:0a:00:00:17",
                "IPv4Address": "10.0.0.23/24",
                "IPv6Address": ""
            },
            "f0a9a2c1e70208fe38d476e8fc5d085d0374bab2ffabf339bb36bf81504a07dd": {
                "Name": "influxdb.1.xn5rumyj6x1l1adtrsuy3uqer",
                "EndpointID": "cebe56f570eaa28cc5f065e817e6dfb366d2c0786b051ccdeea098ad210c68c5",
                "MacAddress": "02:42:0a:00:00:13",
                "IPv4Address": "10.0.0.19/24",
                "IPv6Address": ""
            },
            "ingress-sbox": {
                "Name": "ingress-endpoint",
                "EndpointID": "4dedf17b1e6e8a8645b94198f4af591f92f7619254c8c6702f846ddb736a1fd8",
                "MacAddress": "02:42:0a:00:00:06",
                "IPv4Address": "10.0.0.6/24",
                "IPv6Address": ""
            }
        },
        "Options": {
            "com.docker.network.driver.overlay.vxlanid_list": "4096"
        },
        "Labels": {},
        "Peers": [
            {
                "Name": "62558c6704ca",
                "IP": "10.0.2.225"
            },
            {
                "Name": "e0506a02bffc",
                "IP": "10.10.4.3"
            },
            {
                "Name": "ecfec4ec64f9",
                "IP": "10.10.4.4"
            },
            {
                "Name": "9a23351be38d",
                "IP": "10.10.2.0"
            },
            {
                "Name": "209b8d567679",
                "IP": "10.12.1.2"
            }
        ]
    }
]

Output of docker version:

Client: Docker Engine - Community
 Version:           20.10.6
 API version:       1.41
 Go version:        go1.13.15
 Git commit:        370c289
 Built:             Fri Apr  9 22:46:45 2021
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server: Docker Engine - Community
 Engine:
  Version:          20.10.6
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.13.15
  Git commit:       8728dd2
  Built:            Fri Apr  9 22:44:56 2021
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.4.4
  GitCommit:        05f951a3781f4f2c1911b05e61c160e9c30eaa8e
 runc:
  Version:          1.0.0-rc93
  GitCommit:        12644e614e25b05da6fd08a38ffa0cfe1903fdec
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

Output of docker info:

Client:
 Context:    default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Build with BuildKit (Docker Inc.)
  scan: Docker Scan (Docker Inc., v0.7.0)

Server:
 Containers: 11
  Running: 11
  Paused: 0
  Stopped: 0
 Images: 27
 Server Version: 20.10.6
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 1
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: active
  NodeID: 3kjw190p7axvmi0rz5lyh4rhr
  Is Manager: true
  ClusterID: r9apuestoan9wk5mayhuc4u3p
  Managers: 5
  Nodes: 5
  Default Address Pool: 10.0.0.0/8
  SubnetSize: 24
  Data Path Port: 4789
  Orchestration:
   Task History Retention Limit: 5
  Raft:
   Snapshot Interval: 10000
   Number of Old Snapshots to Retain: 0
   Heartbeat Tick: 1
   Election Tick: 10
  Dispatcher:
   Heartbeat Period: 5 seconds
  CA Configuration:
   Expiry Duration: 3 months
   Force Rotate: 0
  Autolock Managers: false
  Root Rotation In Progress: false
  Node Address: 10.12.1.2
  Manager Addresses:
   10.0.2.225:2377
   10.10.2.0:2377
   10.10.4.3:2377
   10.10.4.4:2377
   10.12.1.2:2377
 Runtimes: io.containerd.runtime.v1.linux runc io.containerd.runc.v2
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 05f951a3781f4f2c1911b05e61c160e9c30eaa8e
 runc version: 12644e614e25b05da6fd08a38ffa0cfe1903fdec
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: default
 Kernel Version: 4.19.0-16-amd64
 Operating System: Debian GNU/Linux 10 (buster)
 OSType: linux
 Architecture: x86_64
 CPUs: 8
 Total Memory: 9.759GiB
 Name: docker125
 ID: X2QP:EQSN:FGIV:RD4Y:YP3Z:LLES:H7LR:KL3K:S6MM:VCNE:7XKK:4P45
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Username: adamus1red
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

WARNING: No swap limit support

Additional environment details (AWS, VirtualBox, physical, etc.):

Swarm is a mix of physical and virtual nodes.

Start with the reported reproduction: create a Swarm ingress network such as 10.0.0.0/24, use an external client at its broadcast address, and publish a service port. Inspect the ingress network with docker network inspect ingress and compare packet behavior with a Wireshark capture. Done means the external client can access published Swarm services from that address.