Problem with sdnbridge and transparent mode witout IP range for the network

[fredericpougnault]

I want to use sdnbridge with transparent mode and an external DHCP.

Below my cni configuration file :
{
"cniVersion": "0.2.0",
"name": "transparent",
"apiVersion":2,
"type": "sdnbridge",
"Master": "Ethernet"
}

I created a pod with containerd and crictl with the command line below:

• crictl.exe runp .\pod.json
  This is my pod.json file:
  {
  "metadata": {
  "name": "Windows",
  "namespace": "default",
  "attempt": 1,
  "uid": "hdishd83djaidwnduwk28bcsb"
  },
  "log_directory": "/tmp"
  }

When I execute the command to create the pod my network is create like this :

ActivityId : 0E550024-EA46-4A66-A049-2C9AED114943
AdditionalParams :
CurrentEndpointCount : 0
Extensions : {@{Id=E7C3B2F0-F3C5-48DF-AF2B-10FED6D72E7A; IsEnabled=False; Name=Plateforme de filtrage Microsoft Windows}, @{Id=E9B59CFA-2BE1-4B21-828F-B6FBDBDDC017; IsEnabled=False; Name=Microsoft Azure VFP Switch Extension},
@{Id=EA24CD6C-D17A-4348-9190-09F0D5BE83DD; IsEnabled=True; Name=Capture NDIS Microsoft}}
Flags : 0
Health : @{LastErrorCode=0; LastUpdateTime=132775553966352126}
ID : 60B2C11D-381C-4F84-91F1-DB1FB2BD9447
IPv6 : False
InterfaceConstraint : @{InterfaceGuid=00000000-0000-0000-0000-000000000000}
LayeredOn : 83B8B8AA-F92D-4451-857E-F0FE36698358
MacPools : {@{EndMacAddress=00-15-5D-15-CF-FF; StartMacAddress=00-15-5D-15-C0-00}}
MaxConcurrentEndpoints : 0
Name : transparent
Policies : {}
Resources : @{AdditionalParams=; AllocationOrder=0; Health=; ID=0E550024-EA46-4A66-A049-2C9AED114943; PortOperationTime=0; State=1; SwitchOperationTime=0; VfpOperationTime=0; parentId=6267B624-6EF8-42EE-8DF9-5EE3044E8707}
State : 1
TotalEndpoints : 0
Type : Transparent
Version : 38654705669

But my pods cannot connect to this network.
The command exit with this error :

time="2021-10-01T11:50:00+02:00" level=fatal msg="run pod sandbox: rpc error: code = Unknown desc = failed to setup network for sandbox "7f493333cfbfe44d82a7e5b87f2050558d25885d1266cc69822c2a5828766c30": netplugin failed: "{\"level\":\"debug\",\"msg\":\"[cni-net] Plugin wcn-net version .\",\"time\":\"2021-10-01T11:49:56+02:00\"}\n{\"level\":\"debug\",\"msg\":\"[net] Network interface: {Index:19 MTU:1500 Name:Ethernet HardwareAddr:c4:37:72:08:35:6f Flags:up|broadcast|multicast} with IP addresses: [fe80::b1df:fcb3:e3fb:cc43/64 10.249.5.50/24]\",\"time\":\"2021-10-01T11:49:56+02:00\"}\n{\"level\":\"debug\",\"msg\":\"[net] Network interface: {Index:23 MTU:1500 Name:Ethernet 3 HardwareAddr:c4:37:72:f9:92:22 Flags:up|broadcast|multicast} with IP addresses: [fe80::f40e:d97e:3699:d3d5/64 10.249.3.249/24]\",\"time\":\"2021-10-01T11:49:56+02:00\"}\n{\"level\":\"debug\",\"msg\":\"[net] Network interface: {Index:1 MTU:-1 Name:Loopback Pseudo-Interface 1 HardwareAddr: Flags:up|loopback|multicast} with IP addresses: [::1/128 127.0.0.1/8]\",\"time\":\"2021-10-01T11:49:56+02:00\"}\n{\"level\":\"debug\",\"msg\":\"[cni-net] Plugin started.\",\"time\":\"2021-10-01T11:49:56+02:00\"}\n{\"level\":\"debug\",\"msg\":\"[cni-net] Processing ADD command with args {ContainerID:7f493333cfbfe44d82a7e5b87f2050558d25885d1266cc69822c2a5828766c30 Netns:057764d1-434b-4c86-8c7e-6329e33bce53 IfName:eth0 Args:K8S_POD_NAMESPACE=default;K8S_POD_NAME=Windows;K8S_POD_INFRA_CONTAINER_ID=7f493333cfbfe44d82a7e5b87f2050558d25885d1266cc69822c2a5828766c30;K8S_POD_UID=hdishd83djaidwnduwk28bcsb;IgnoreUnknown=1 Path:C:/opt/cni/bin}.\",\"time\":\"2021-10-01T11:49:56+02:00\"}\n{\"level\":\"debug\",\"msg\":\"[cni-net] Read network configuration \\u0026{CniVersion:0.2.0 Name:transparent Type:sdnbridge Ipam:{Type: Environment: AddrSpace: Subnet: Address: QueryInterval: Routes:[]} DNS:{Nameservers:[] Domain: Search:[] Options:[]} OptionalFlags:{LocalRoutePortMapping:false AllowAclPortMapping:false} RuntimeConfig:{PortMappings:[] DNS:{Servers:[] Searches:[] Options:[]}} AdditionalArgs:[]}.\",\"time\":\"2021-10-01T11:49:56+02:00\"}\n{\"level\":\"debug\",\"msg\":\"Parsing port mappings from []\",\"time\":\"2021-10-01T11:49:56+02:00\"}\n{\"level\":\"info\",\"msg\":\"[cni-net] Creating network.\",\"time\":\"2021-10-01T11:49:56+02:00\"}\n{\"level\":\"debug\",\"msg\":\"hcn::HostComputeNetwork::Create id=\",\"time\":\"2021-10-01T11:49:56+02:00\"}\n{\"level\":\"debug\",\"msg\":\"hcn::HostComputeNetwork::Create JSON: {\\\"Name\\\":\\\"transparent\\\",\\\"Type\\\":\\\"transparent\\\",\\\"MacPool\\\":{},\\\"Dns\\\":{},\\\"SchemaVersion\\\":{\\\"Major\\\":2,\\\"Minor\\\":0}}\",\"time\":\"2021-10-01T11:49:56+02:00\"}\npanic: runtime error: index out of range\n\ngoroutine 1 [running]:\ngithub.com/Microsoft/windows-container-networking/network.GetNetworkInfoFromHostComputeNetwork(0xc0000961e0, 0xc0000961e0)\n\t/home/nagiesek/repo/gopath/src/github.com/Microsoft/windows-container-networking/network/network.go:93 +0x612\ngithub.com/Microsoft/windows-container-networking/network.(*networkManager).CreateNetwork(0xc000098060, 0xc000052dd0, 0x0, 0x0, 0x0)\n\t/home/nagiesek/repo/gopath/src/github.com/Microsoft/windows-container-networking/network/manager.go:68 +0xe2\ngithub.com/Microsoft/windows-container-networking/common/core.getOrCreateNetwork(0xc000044620, 0xc000052dd0, 0xc00007c180, 0x40, 0x0, 0x0)\n\t/home/nagiesek/repo/gopath/src/github.com/Microsoft/windows-container-networking/common/core/network.go:241 +0xe2\ngithub.com/Microsoft/windows-container-networking/common/core.(*netPlugin).Add(0xc000044620, 0xc00009c310, 0x0, 0x0)\n\t/home/nagiesek/repo/gopath/src/github.com/Microsoft/windows-container-networking/common/core/network.go:127 +0x57e\ngithub.com/Microsoft/windows-container-networking/vendor/github.com/containernetworking/cni/pkg/skel.(*dispatcher).checkVersionAndCall(0xc000077e98, 0xc00009c310, 0x5cc600, 0xc000098690, 0xc000077e80, 0x0, 0x28)\n\t/home/nagiesek/repo/gopath/src/github.com/Microsoft/windows-container-networking/vendor/github.com/containernetworking/cni/pkg/skel/skel.go:185 +0x260\ngithub.com/Microsoft/windows-container-networking/vendor/github.com/containernetworking/cni/pkg/skel.(*dispatcher).pluginMain(0xc000077e98, 0xc000077e80, 0x0, 0xc000077e68, 0x5cc600, 0xc000098690, 0x59d28d, 0x11, 0x53df1a)\n\t/home/nagiesek/repo/gopath/src/github.com/Microsoft/windows-container-networking/vendor/github.com/containernetworking/cni/pkg/skel/skel.go:221 +0x550\ngithub.com/Microsoft/windows-container-networking/vendor/github.com/containernetworking/cni/pkg/skel.PluginMainWithError(...)\n\t/home/nagiesek/repo/gopath/src/github.com/Microsoft/windows-container-networking/vendor/github.com/containernetworking/cni/pkg/skel/skel.go:286\ngithub.com/Microsoft/windows-container-networking/cni.(*Plugin).Execute(0xc000078028, 0x5cc580, 0xc000044620, 0x0, 0xc000078020)\n\t/home/nagiesek/repo/gopath/src/github.com/Microsoft/windows-container-networking/cni/plugin.go:49 +0x225\ngithub.com/Microsoft/windows-container-networking/common/core.Core()\n\t/home/nagiesek/repo/gopath/src/github.com/Microsoft/windows-container-networking/common/core/core.go:47 +0x29c\nmain.main()\n\t/home/nagiesek/repo/gopath/src/github.com/Microsoft/windows-container-networking/plugins/sdnbridge/sdnbridge_windows.go:16 +0x27\n"".

I can the an error like index out of range, I think it's because my network doesn't have an IP range.

[nagiesek]

In transparent if you don't pass a network it will automatically pick one up from the vnet. You can see this in the error/logs with IP addresses: [fe80::b1df:fcb3:e3fb:cc43/64 10.249.5.50/24]

[nagiesek]

I don't really work on this stuff anymore but my guess would be that the issue is w/ the IPv6 address being picked up by the CNI.

@vikas-bh you might find this interesting.