In a new Windows Server version 1809 VM:
#############################################################################
#############################################################################
Windows PowerShell
Copyright (C) Microsoft Corporation. All rights reserved.
PS C:\Windows\system32> Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force
Name Version Source Summary
---- ------- ------ -------
nuget 2.8.5.208 https://onege... NuGet provider for the OneGet meta-package manager
PS C:\Windows\system32> Install-Module -Name DockerMsftProvider -Repository PSGallery -Force
PS C:\Windows\system32> $docker_version = "18.09"
PS C:\Windows\system32> Install-Package -Name docker -ProviderName DockerMsftProvider -Force -RequiredVersion ${docker_version}
WARNING: A restart is required to enable the containers feature. Please restart your machine.
Name Version Source Summary
---- ------- ------ -------
Docker 18.09.6 DockerDefault Contains Docker EE for use with Windows Server.
PS C:\Windows\system32> Restart-Computer -Force
#############################################################################
#############################################################################
Windows PowerShell
Copyright (C) Microsoft Corporation. All rights reserved.
PS C:\Windows\system32> Restart-Service docker
PS C:\Windows\system32> docker network ls
NETWORK ID NAME DRIVER SCOPE
03cc74a257df nat nat local
cf2c1358972a none null local
PS C:\Windows\system32> Get-HnsNetwork
ActivityId : 4D33F926-F95A-4D6A-A7E2-194911DCF003
AdditionalParams :
CurrentEndpointCount : 0
Extensions : {@{Id=E7C3B2F0-F3C5-48DF-AF2B-10FED6D72E7A; IsEnabled=False; Name=Microsoft Windows Filtering Platform},
@{Id=E9B59CFA-2BE1-4B21-828F-B6FBDBDDC017; IsEnabled=False; Name=Microsoft Azure VFP Switch Extension},
@{Id=EA24CD6C-D17A-4348-9190-09F0D5BE83DD; IsEnabled=True; Name=Microsoft NDIS Capture}}
Flags : 0
Health : @{AddressNotificationMissedCount=0; AddressNotificationSequenceNumber=0; InterfaceNotificationMissedCount=0;
InterfaceNotificationSequenceNumber=0; LastErrorCode=0; LastUpdateTime=132053549732110223;
RouteNotificationMissedCount=0; RouteNotificationSequenceNumber=0}
ID : 0F82BC87-81F4-4473-989E-014FD5814DC7
IPv6 : False
LayeredOn : 9F6FD7D8-8A8D-4003-A7E7-00817368DC5E
MacPools : {@{EndMacAddress=00-15-5D-63-7F-FF; StartMacAddress=00-15-5D-63-70-00}}
MaxConcurrentEndpoints : 0
Name : nat
NatName : ICS5465B41C-FDF1-4174-A5AF-A8783C4777FF
Policies : {}
Resources : @{AdditionalParams=; AllocationOrder=2; Allocators=System.Object[]; Health=;
ID=4D33F926-F95A-4D6A-A7E2-194911DCF003; PortOperationTime=0; State=1; SwitchOperationTime=0;
VfpOperationTime=0; parentId=55E848A6-F99F-4121-9C08-1A95370D059D}
State : 1
Subnets : {@{AdditionalParams=; AddressPrefix=172.24.144.0/20; GatewayAddress=172.24.144.1; Health=;
ID=6C91C9C3-5DAB-4BEF-8C8A-A5F113395325; Policies=System.Object[]; State=0}}
TotalEndpoints : 0
Type : nat
Version : 38654705666
#####################################################################
## VM's primary NIC MTU is 1460, but container network assumes 1500:
#####################################################################
PS C:\Windows\system32> netsh interface ipv4 show subinterfaces
MTU MediaSenseState Bytes In Bytes Out Interface
------ --------------- --------- --------- -------------
4294967295 1 0 0 Loopback Pseudo-Interface 1
1460 1 1425697 1020127 Ethernet
1500 1 0 1610 vEthernet (nat)
PS C:\Windows\system32> netsh interface ipv4 set subinterface "vEthernet (nat)" mtu=1432 store=persistent
Ok.
PS C:\Windows\system32> netsh interface ipv4 set subinterface "Ethernet" mtu=1432 store=persistent
Ok.
#####################################################################
## Force all MTUs to 1432 to start (no containers yet):
#####################################################################
PS C:\Windows\system32> netsh interface ipv4 show subinterfaces
MTU MediaSenseState Bytes In Bytes Out Interface
------ --------------- --------- --------- -------------
4294967295 1 0 0 Loopback Pseudo-Interface 1
1432 1 1689341 1164354 Ethernet
1432 1 0 1610 vEthernet (nat)
PS C:\Windows\system32> cd C:\
PS C:\> Invoke-WebRequest https://github.com/Microsoft/SDN/raw/master/Kubernetes/windows/hns.psm1 -OutFile hns.psm1
PS C:\> Import-Module -Force C:\hns.psm1
WARNING: The names of some imported commands from the module 'hns' include unapproved verbs that might make them less discoverable. To
find the commands with unapproved verbs, run the Import-Module command again with the Verbose parameter. For a list of approved verbs,
type Get-Verb.
PS C:\> docker pull mcr.microsoft.com/windows/nanoserver:1809
1809: Pulling from windows/nanoserver
4afaf8a8c3fa: Pull complete
Digest: sha256:535887492a56d570a018063d259a99e576cf6092204f87c0d2937fb160e5b090
Status: Downloaded newer image for mcr.microsoft.com/windows/nanoserver:1809
PS C:\> docker image list
REPOSITORY TAG IMAGE ID CREATED SIZE
mcr.microsoft.com/windows/nanoserver 1809 e662afff12c3 6 days ago 250MB
PS C:\> docker run --name default-container-network -di mcr.microsoft.com/windows/nanoserver:1809 cmd.exe
4b105e1609f6742749f6024dc2591f4254a9bd77db41bcdfadae45a460ee25c6
PS C:\> netsh interface ipv4 show subinterfaces
MTU MediaSenseState Bytes In Bytes Out Interface
------ --------------- --------- --------- -------------
4294967295 1 0 0 Loopback Pseudo-Interface 1
1432 1 763115557 4495773 Ethernet
1432 1 4130 96139 vEthernet (nat)
#####################################################################
## On default container network, new containers still get an MTU of
## 1500:
#####################################################################
PS C:\> docker exec default-container-network cmd.exe '/c netsh interface ipv4 show subinterfaces'
MTU MediaSenseState Bytes In Bytes Out Interface
------ --------------- --------- --------- -------------
4294967295 1 0 0 Loopback Pseudo-Interface 2
1500 1 209514 5024 vEthernet (Ethernet)
PS C:\> Get-NetAdapter
Name InterfaceDescription ifIndex Status MacAddress LinkSpeed
---- -------------------- ------- ------ ---------- ---------
Ethernet Google VirtIO Ethernet Adapter 6 Up 42-01-0A-8A-00-05 100 Gbps
vEthernet (Ethernet) 17 Up 00-15-5D-63-74-E3 10 Gbps
vEthernet (nat) Hyper-V Virtual Ethernet Adapter 12 Up 00-15-5D-63-7A-72 10 Gbps
PS C:\> Get-HnsNetwork
ActivityId : 4D33F926-F95A-4D6A-A7E2-194911DCF003
AdditionalParams :
CurrentEndpointCount : 1
Extensions : {@{Id=E7C3B2F0-F3C5-48DF-AF2B-10FED6D72E7A; IsEnabled=False; Name=Microsoft Windows Filtering Platform},
@{Id=E9B59CFA-2BE1-4B21-828F-B6FBDBDDC017; IsEnabled=False; Name=Microsoft Azure VFP Switch Extension},
@{Id=EA24CD6C-D17A-4348-9190-09F0D5BE83DD; IsEnabled=True; Name=Microsoft NDIS Capture}}
Flags : 0
Health : @{AddressNotificationMissedCount=0; AddressNotificationSequenceNumber=0; InterfaceNotificationMissedCount=0;
InterfaceNotificationSequenceNumber=0; LastErrorCode=0; LastUpdateTime=132053549732110223;
RouteNotificationMissedCount=0; RouteNotificationSequenceNumber=0}
ID : 0F82BC87-81F4-4473-989E-014FD5814DC7
IPv6 : False
LayeredOn : 9F6FD7D8-8A8D-4003-A7E7-00817368DC5E
MacPools : {@{EndMacAddress=00-15-5D-63-7F-FF; StartMacAddress=00-15-5D-63-70-00}}
MaxConcurrentEndpoints : 1
Name : nat
NatName : ICS5465B41C-FDF1-4174-A5AF-A8783C4777FF
Policies : {}
Resources : @{AdditionalParams=; AllocationOrder=2; Allocators=System.Object[]; Health=;
ID=4D33F926-F95A-4D6A-A7E2-194911DCF003; PortOperationTime=0; State=1; SwitchOperationTime=0;
VfpOperationTime=0; parentId=55E848A6-F99F-4121-9C08-1A95370D059D}
State : 1
Subnets : {@{AdditionalParams=; AddressPrefix=172.24.144.0/20; GatewayAddress=172.24.144.1; Health=;
ID=6C91C9C3-5DAB-4BEF-8C8A-A5F113395325; Policies=System.Object[]; State=0}}
TotalEndpoints : 1
Type : nat
Version : 38654705666
PS C:\> docker network list
NETWORK ID NAME DRIVER SCOPE
03cc74a257df nat nat local
cf2c1358972a none null local
#####################################################################
## Create a new HNS network, as is typically done for Kubernetes
## nodes (https://github.com/microsoft/SDN/blob/f670593b648e974e079b10dfa6ca8c8b307450ce/Kubernetes/containerd/start.ps1#L344):
#####################################################################
PS C:\> New-HNSNetwork `
>> -Type "L2Bridge" `
>> -AddressPrefix "192.168.255.0/30" `
>> -Gateway "192.168.255.1" `
>> -Name "External" `
>> -Verbose
VERBOSE: Invoke-HNSRequest Method[POST] Path[/networks] Data[{
"Subnets": [
{
"GatewayAddress": "192.168.255.1",
"AddressPrefix": "192.168.255.0/30"
}
],
"Name": "External",
"Type": "L2Bridge"
}]
VERBOSE: Result :
{"Output":{"ActivityId":"D39AB36F-CFD7-49FD-A850-B11B01235114","AdditionalParams":{},"CurrentEndpointCount":0,"Extensions":[{"Id":"E7C3B
2F0-F3C5-48DF-AF2B-10FED6D72E7A","IsEnabled":false,"Name":"Microsoft Windows Filtering
Platform"},{"Id":"E9B59CFA-2BE1-4B21-828F-B6FBDBDDC017","IsEnabled":true,"Name":"Microsoft Azure VFP Switch
Extension"},{"Id":"EA24CD6C-D17A-4348-9190-09F0D5BE83DD","IsEnabled":true,"Name":"Microsoft NDIS
Capture"}],"Flags":0,"Health":{"LastErrorCode":0,"LastUpdateTime":132053679924342821},"ID":"544A3CAB-A2FF-45FE-8E35-08C709B6E69F","IPv6"
:false,"LayeredOn":"1C6F0B0A-7BB1-4EB6-A6BE-FEB346DBADAD","MacPools":[{"EndMacAddress":"00-15-5D-3E-AF-FF","StartMacAddress":"00-15-5D-3
E-A0-00"}],"ManagementIP":"10.138.0.5","MaxConcurrentEndpoints":0,"Name":"External","Policies":[],"Resources":{"AdditionalParams":{},"Al
locationOrder":0,"Health":{"LastErrorCode":0,"LastUpdateTime":132053679942716028},"ID":"D39AB36F-CFD7-49FD-A850-B11B01235114","PortOpera
tionTime":0,"State":1,"SwitchOperationTime":0,"VfpOperationTime":0,"parentId":"D1199153-8EE9-4572-A9B0-3362F5563C3E"},"State":1,"Subnets
":[{"AdditionalParams":{},"AddressPrefix":"192.168.255.0/30","GatewayAddress":"192.168.255.1","Health":{"LastErrorCode":0,"LastUpdateTim
e":132053679924342821},"ID":"18C34090-D87D-4645-8820-5758B33044F2","ObjectType":5,"Policies":[],"State":0}],"TotalEndpoints":0,"Type":"L
2Bridge","Version":38654705666},"Success":true}
ActivityId : D39AB36F-CFD7-49FD-A850-B11B01235114
AdditionalParams :
CurrentEndpointCount : 0
Extensions : {@{Id=E7C3B2F0-F3C5-48DF-AF2B-10FED6D72E7A; IsEnabled=False; Name=Microsoft Windows Filtering Platform},
@{Id=E9B59CFA-2BE1-4B21-828F-B6FBDBDDC017; IsEnabled=True; Name=Microsoft Azure VFP Switch Extension},
@{Id=EA24CD6C-D17A-4348-9190-09F0D5BE83DD; IsEnabled=True; Name=Microsoft NDIS Capture}}
Flags : 0
Health : @{LastErrorCode=0; LastUpdateTime=132053679924342821}
ID : 544A3CAB-A2FF-45FE-8E35-08C709B6E69F
IPv6 : False
LayeredOn : 1C6F0B0A-7BB1-4EB6-A6BE-FEB346DBADAD
MacPools : {@{EndMacAddress=00-15-5D-3E-AF-FF; StartMacAddress=00-15-5D-3E-A0-00}}
ManagementIP : 10.138.0.5
MaxConcurrentEndpoints : 0
Name : External
Policies : {}
Resources : @{AdditionalParams=; AllocationOrder=0; Health=; ID=D39AB36F-CFD7-49FD-A850-B11B01235114; PortOperationTime=0;
State=1; SwitchOperationTime=0; VfpOperationTime=0; parentId=D1199153-8EE9-4572-A9B0-3362F5563C3E}
State : 1
Subnets : {@{AdditionalParams=; AddressPrefix=192.168.255.0/30; GatewayAddress=192.168.255.1; Health=;
ID=18C34090-D87D-4645-8820-5758B33044F2; ObjectType=5; Policies=System.Object[]; State=0}}
TotalEndpoints : 0
Type : L2Bridge
Version : 38654705666
PS C:\> Get-NetAdapter
Name InterfaceDescription ifIndex Status MacAddress LinkSpeed
---- -------------------- ------- ------ ---------- ---------
Ethernet Google VirtIO Ethernet Adapter 6 Up 42-01-0A-8A-00-05 100 Gbps
vEthernet (Ethernet) 17 Up 00-15-5D-63-74-E3 10 Gbps
vEthernet (nat) Hyper-V Virtual Ethernet Adapter 12 Up 00-15-5D-63-7A-72 10 Gbps
vEthernet (Ethernet) 2 Hyper-V Virtual Ethernet Adapter #3 8 Up 42-01-0A-8A-00-05 100 Gbps
#####################################################################
## The just-created L2Bridge type HNS network subsumes the previous
## Ethernet interface with the "vEthernet (Ethernet) 2" interface
## which for some reason has an MTU of 1450 rather than 1432 or 1500.
## Also, the MTU of the existing "vEthernet (nat)" interface has been
## decreased by 50 bytes!
#####################################################################
PS C:\> netsh interface ipv4 show subinterfaces
MTU MediaSenseState Bytes In Bytes Out Interface
------ --------------- --------- --------- -------------
4294967295 1 0 0 Loopback Pseudo-Interface 1
1382 1 20451 112615 vEthernet (nat)
1450 1 45199185 901573 vEthernet (Ethernet) 2
PS C:\> Get-HnsNetwork
ActivityId : 4D33F926-F95A-4D6A-A7E2-194911DCF003
AdditionalParams :
CurrentEndpointCount : 1
Extensions : {@{Id=E7C3B2F0-F3C5-48DF-AF2B-10FED6D72E7A; IsEnabled=False; Name=Microsoft Windows Filtering Platform},
@{Id=E9B59CFA-2BE1-4B21-828F-B6FBDBDDC017; IsEnabled=False; Name=Microsoft Azure VFP Switch Extension},
@{Id=EA24CD6C-D17A-4348-9190-09F0D5BE83DD; IsEnabled=True; Name=Microsoft NDIS Capture}}
Flags : 0
Health : @{AddressNotificationMissedCount=0; AddressNotificationSequenceNumber=0; InterfaceNotificationMissedCount=0;
InterfaceNotificationSequenceNumber=0; LastErrorCode=0; LastUpdateTime=132053549732110223;
RouteNotificationMissedCount=0; RouteNotificationSequenceNumber=0}
ID : 0F82BC87-81F4-4473-989E-014FD5814DC7
IPv6 : False
LayeredOn : 9F6FD7D8-8A8D-4003-A7E7-00817368DC5E
MacPools : {@{EndMacAddress=00-15-5D-63-7F-FF; StartMacAddress=00-15-5D-63-70-00}}
MaxConcurrentEndpoints : 1
Name : nat
NatName : ICS5465B41C-FDF1-4174-A5AF-A8783C4777FF
Policies : {}
Resources : @{AdditionalParams=; AllocationOrder=2; Allocators=System.Object[]; Health=;
ID=4D33F926-F95A-4D6A-A7E2-194911DCF003; PortOperationTime=0; State=1; SwitchOperationTime=0;
VfpOperationTime=0; parentId=55E848A6-F99F-4121-9C08-1A95370D059D}
State : 1
Subnets : {@{AdditionalParams=; AddressPrefix=172.24.144.0/20; GatewayAddress=172.24.144.1; Health=;
ID=6C91C9C3-5DAB-4BEF-8C8A-A5F113395325; Policies=System.Object[]; State=0}}
TotalEndpoints : 1
Type : nat
Version : 38654705666
ActivityId : D39AB36F-CFD7-49FD-A850-B11B01235114
AdditionalParams :
CurrentEndpointCount : 0
Extensions : {@{Id=E7C3B2F0-F3C5-48DF-AF2B-10FED6D72E7A; IsEnabled=False; Name=Microsoft Windows Filtering Platform},
@{Id=E9B59CFA-2BE1-4B21-828F-B6FBDBDDC017; IsEnabled=True; Name=Microsoft Azure VFP Switch Extension},
@{Id=EA24CD6C-D17A-4348-9190-09F0D5BE83DD; IsEnabled=True; Name=Microsoft NDIS Capture}}
Flags : 0
Health : @{LastErrorCode=0; LastUpdateTime=132053679924342821}
ID : 544A3CAB-A2FF-45FE-8E35-08C709B6E69F
IPv6 : False
LayeredOn : 1C6F0B0A-7BB1-4EB6-A6BE-FEB346DBADAD
MacPools : {@{EndMacAddress=00-15-5D-3E-AF-FF; StartMacAddress=00-15-5D-3E-A0-00}}
ManagementIP : 10.138.0.5
MaxConcurrentEndpoints : 0
Name : External
Policies : {}
Resources : @{AdditionalParams=; AllocationOrder=0; Health=; ID=D39AB36F-CFD7-49FD-A850-B11B01235114; PortOperationTime=0;
State=1; SwitchOperationTime=0; VfpOperationTime=0; parentId=D1199153-8EE9-4572-A9B0-3362F5563C3E}
State : 1
Subnets : {@{AdditionalParams=; AddressPrefix=192.168.255.0/30; GatewayAddress=192.168.255.1; Health=;
ID=18C34090-D87D-4645-8820-5758B33044F2; ObjectType=5; Policies=System.Object[]; State=0}}
TotalEndpoints : 0
Type : L2Bridge
Version : 38654705666
PS C:\> docker run --name after-new-hnsnetwork -di mcr.microsoft.com/windows/nanoserver:1809 cmd.exe
922c7d5809af3fab6c358ae70056963a0e6c32819b6e95ae787d8e72c9eab9ae
PS C:\> Get-NetAdapter
Name InterfaceDescription ifIndex Status MacAddress LinkSpeed
---- -------------------- ------- ------ ---------- ---------
Ethernet Google VirtIO Ethernet Adapter 6 Up 42-01-0A-8A-00-05 100 Gbps
vEthernet (Ethernet) 3 27 Up 00-15-5D-63-70-23 10 Gbps
vEthernet (Ethernet) 17 Up 00-15-5D-63-74-E3 10 Gbps
vEthernet (nat) Hyper-V Virtual Ethernet Adapter 12 Up 00-15-5D-63-7A-72 10 Gbps
vEthernet (Ethernet) 2 Hyper-V Virtual Ethernet Adapter #3 8 Up 42-01-0A-8A-00-05 100 Gbps
PS C:\> netsh interface ipv4 show subinterfaces
MTU MediaSenseState Bytes In Bytes Out Interface
------ --------------- --------- --------- -------------
4294967295 1 0 0 Loopback Pseudo-Interface 1
1382 1 34161 210863 vEthernet (nat)
1450 1 100086696 2016233 vEthernet (Ethernet) 2
#####################################################################
## The just-created container is still connected as an endpoint on
## the default nat container network, not the L2Bridge network.
#####################################################################
PS C:\> Get-HnsNetwork
ActivityId : 4D33F926-F95A-4D6A-A7E2-194911DCF003
AdditionalParams :
CurrentEndpointCount : 2
Extensions : {@{Id=E7C3B2F0-F3C5-48DF-AF2B-10FED6D72E7A; IsEnabled=False; Name=Microsoft Windows Filtering Platform},
@{Id=E9B59CFA-2BE1-4B21-828F-B6FBDBDDC017; IsEnabled=False; Name=Microsoft Azure VFP Switch Extension},
@{Id=EA24CD6C-D17A-4348-9190-09F0D5BE83DD; IsEnabled=True; Name=Microsoft NDIS Capture}}
Flags : 0
Health : @{AddressNotificationMissedCount=0; AddressNotificationSequenceNumber=0; InterfaceNotificationMissedCount=0;
InterfaceNotificationSequenceNumber=0; LastErrorCode=0; LastUpdateTime=132053549732110223;
RouteNotificationMissedCount=0; RouteNotificationSequenceNumber=0}
ID : 0F82BC87-81F4-4473-989E-014FD5814DC7
IPv6 : False
LayeredOn : 9F6FD7D8-8A8D-4003-A7E7-00817368DC5E
MacPools : {@{EndMacAddress=00-15-5D-63-7F-FF; StartMacAddress=00-15-5D-63-70-00}}
MaxConcurrentEndpoints : 2
Name : nat
NatName : ICS5465B41C-FDF1-4174-A5AF-A8783C4777FF
Policies : {}
Resources : @{AdditionalParams=; AllocationOrder=2; Allocators=System.Object[]; Health=;
ID=4D33F926-F95A-4D6A-A7E2-194911DCF003; PortOperationTime=0; State=1; SwitchOperationTime=0;
VfpOperationTime=0; parentId=55E848A6-F99F-4121-9C08-1A95370D059D}
State : 1
Subnets : {@{AdditionalParams=; AddressPrefix=172.24.144.0/20; GatewayAddress=172.24.144.1; Health=;
ID=6C91C9C3-5DAB-4BEF-8C8A-A5F113395325; Policies=System.Object[]; State=0}}
TotalEndpoints : 2
Type : nat
Version : 38654705666
ActivityId : D39AB36F-CFD7-49FD-A850-B11B01235114
AdditionalParams :
CurrentEndpointCount : 0
Extensions : {@{Id=E7C3B2F0-F3C5-48DF-AF2B-10FED6D72E7A; IsEnabled=False; Name=Microsoft Windows Filtering Platform},
@{Id=E9B59CFA-2BE1-4B21-828F-B6FBDBDDC017; IsEnabled=True; Name=Microsoft Azure VFP Switch Extension},
@{Id=EA24CD6C-D17A-4348-9190-09F0D5BE83DD; IsEnabled=True; Name=Microsoft NDIS Capture}}
Flags : 0
Health : @{LastErrorCode=0; LastUpdateTime=132053679924342821}
ID : 544A3CAB-A2FF-45FE-8E35-08C709B6E69F
IPv6 : False
LayeredOn : 1C6F0B0A-7BB1-4EB6-A6BE-FEB346DBADAD
MacPools : {@{EndMacAddress=00-15-5D-3E-AF-FF; StartMacAddress=00-15-5D-3E-A0-00}}
ManagementIP : 10.138.0.5
MaxConcurrentEndpoints : 0
Name : External
Policies : {}
Resources : @{AdditionalParams=; AllocationOrder=0; Health=; ID=D39AB36F-CFD7-49FD-A850-B11B01235114; PortOperationTime=0;
State=1; SwitchOperationTime=0; VfpOperationTime=0; parentId=D1199153-8EE9-4572-A9B0-3362F5563C3E}
State : 1
Subnets : {@{AdditionalParams=; AddressPrefix=192.168.255.0/30; GatewayAddress=192.168.255.1; Health=;
ID=18C34090-D87D-4645-8820-5758B33044F2; ObjectType=5; Policies=System.Object[]; State=0}}
TotalEndpoints : 0
Type : L2Bridge
Version : 38654705666
#####################################################################
## The MTU of the just-created container is 1450 instead of 1500!
#####################################################################
PS C:\> docker exec after-new-hnsnetwork cmd.exe '/c netsh interface ipv4 show subinterfaces'
MTU MediaSenseState Bytes In Bytes Out Interface
------ --------------- --------- --------- -------------
4294967295 1 0 0 Loopback Pseudo-Interface 3
1450 1 191610 4394 vEthernet (Ethernet) 3
#####################################################################
## Remove the HNS network we just created:
#####################################################################
PS C:\> Get-HnsNetwork | Where-Object Name -eq "External" | Remove-HnsNetwork
PS C:\> Get-NetAdapter
Name InterfaceDescription ifIndex Status MacAddress LinkSpeed
---- -------------------- ------- ------ ---------- ---------
Ethernet Google VirtIO Ethernet Adapter 6 Up 42-01-0A-8A-00-05 100 Gbps
vEthernet (Ethernet) 3 27 Up 00-15-5D-63-70-23 10 Gbps
vEthernet (Ethernet) 17 Up 00-15-5D-63-74-E3 10 Gbps
vEthernet (nat) Hyper-V Virtual Ethernet Adapter 12 Up 00-15-5D-63-7A-72 10 Gbps
#####################################################################
## The Ethernet interface is back with the same MTU that we set it to
## previously, but the MTU of the "vEthernet (nat)" interface is
## still 50 bytes less than what we set it to.
#####################################################################
PS C:\> netsh interface ipv4 show subinterfaces
MTU MediaSenseState Bytes In Bytes Out Interface
------ --------------- --------- --------- -------------
4294967295 1 0 0 Loopback Pseudo-Interface 1
1432 1 19948152 212130 Ethernet
1382 1 45352 223624 vEthernet (nat)
PS C:\> docker run --name after-remove-hnsnetwork -di mcr.microsoft.com/windows/nanoserver:1809 cmd.exe
c844efa4150b17eca1bc3b3dcf17ba575b8358683ca089b5cc696f3b3b796eac
#####################################################################
## Newly created containers now get an MTU of 1500 again.
#####################################################################
PS C:\> docker exec after-remove-hnsnetwork cmd.exe '/c netsh interface ipv4 show subinterfaces'
MTU MediaSenseState Bytes In Bytes Out Interface
------ --------------- --------- --------- -------------
4294967295 1 0 0 Loopback Pseudo-Interface 4
1500 1 191530 4451 vEthernet (Ethernet) 2
PS C:\> Get-HnsNetwork
ActivityId : 4D33F926-F95A-4D6A-A7E2-194911DCF003
AdditionalParams :
CurrentEndpointCount : 3
Extensions : {@{Id=E7C3B2F0-F3C5-48DF-AF2B-10FED6D72E7A; IsEnabled=False; Name=Microsoft Windows Filtering Platform},
@{Id=E9B59CFA-2BE1-4B21-828F-B6FBDBDDC017; IsEnabled=False; Name=Microsoft Azure VFP Switch Extension},
@{Id=EA24CD6C-D17A-4348-9190-09F0D5BE83DD; IsEnabled=True; Name=Microsoft NDIS Capture}}
Flags : 0
Health : @{AddressNotificationMissedCount=0; AddressNotificationSequenceNumber=0; InterfaceNotificationMissedCount=0;
InterfaceNotificationSequenceNumber=0; LastErrorCode=0; LastUpdateTime=132053549732110223;
RouteNotificationMissedCount=0; RouteNotificationSequenceNumber=0}
ID : 0F82BC87-81F4-4473-989E-014FD5814DC7
IPv6 : False
LayeredOn : 9F6FD7D8-8A8D-4003-A7E7-00817368DC5E
MacPools : {@{EndMacAddress=00-15-5D-63-7F-FF; StartMacAddress=00-15-5D-63-70-00}}
MaxConcurrentEndpoints : 3
Name : nat
NatName : ICS5465B41C-FDF1-4174-A5AF-A8783C4777FF
Policies : {}
Resources : @{AdditionalParams=; AllocationOrder=2; Allocators=System.Object[]; Health=;
ID=4D33F926-F95A-4D6A-A7E2-194911DCF003; PortOperationTime=0; State=1; SwitchOperationTime=0;
VfpOperationTime=0; parentId=55E848A6-F99F-4121-9C08-1A95370D059D}
State : 1
Subnets : {@{AdditionalParams=; AddressPrefix=172.24.144.0/20; GatewayAddress=172.24.144.1; Health=;
ID=6C91C9C3-5DAB-4BEF-8C8A-A5F113395325; Policies=System.Object[]; State=0}}
TotalEndpoints : 3
Type : nat
Version : 38654705666
PS C:\> docker exec after-new-hnsnetwork cmd.exe '/c netsh interface ipv4 show subinterfaces'
MTU MediaSenseState Bytes In Bytes Out Interface
------ --------------- --------- --------- -------------
4294967295 1 0 0 Loopback Pseudo-Interface 3
1450 1 222888 15821 vEthernet (Ethernet) 3
PS C:\> docker exec default-container-network cmd.exe '/c netsh interface ipv4 show subinterfaces'
MTU MediaSenseState Bytes In Bytes Out Interface
------ --------------- --------- --------- -------------
4294967295 1 0 0 Loopback Pseudo-Interface 2
1500 1 243998 30811 vEthernet (Ethernet)