Part 1 – Azure BGP Network Triangulation

In this post we’ll setup the Azure configuration in Region 1 (West Europe)

You will need to create in advance, two VNets (vnspoke1 and vnhub0).

The VNet vnspoke1 uses address space 10.10.1.0/24. Create a subnet within this VNet and place a VM within that we will use for our ping tests. Your setup should resemble to following:

As VNet peering is a relatively new capability within Azure, for clarity are the network peering setting from the portal for vnspoke1:

and vnhub0:

The VNet vnhub0 uses address space 10.10.0.0/24 within this create  a default gateway subnet that will hold our Virtual Network Gateway “gwwebgp”. This PowerShell sets up this gateway

# network, The BGP address used at home, the subnet range for BGP 
$rg=”atnettest”
$vn=”vnhub0″
$loc=’westeurope’
$vngwname=’gwwebgp’
$gwlocal=’homenet’
$VNet1ASN=65010

# Private ASN for home network
$LNGASN=65168

# these BGP addresses come from part 3
$BGPPeerIP5=’10.168.0.253′
$locprefix=’10.168.0.253/32′

# get a public ip for the gateway
$gwipconfig = New-AzureRmVirtualNetworkGatewayIpConfig -Name gwipconfig1 -SubnetId $subnet.Id -PublicIpAddressId $gwpip.Id
#
# make the gateway – will take a while – typically about 30 minutes
#
date
New-AzureRmVirtualNetworkGateway -Name $vngwname -ResourceGroupName $rg -Location $loc -IpConfigurations $gwipconfig -GatewayType Vpn -VpnType RouteBased -GatewaySku Standard -Asn $VNet1ASN -EnableBgp $true
#New-AzureRmVirtualNetworkGateway -Name $vngwname -ResourceGroupName $rg -Location $loc -IpConfigurations $gwipconfig -GatewayType Vpn -VpnType RouteBased -GatewaySku HighPerformance -Asn $VNet1ASN -EnableBgp $true
date

# get the public ip for local gw we’ll need to make a note of this for part 3
Get-AzureRmPublicIpAddress -Name gwpip -ResourceGroupName $rg
$gateway1 = Get-AzureRmVirtualNetworkGateway -Name $vngwname -ResourceGroupName $rg

# get the BGP ip for local gw – we’ll need to make a note of this for part 3
$gateway1.BgpSettingsText
#
# In the following replace a.b.c.d in the following with your home public IP address
New-AzureRmLocalNetworkGateway -Name $gwlocal -ResourceGroupName $rg

-Location $loc -GatewayIpAddress ‘a.b.c.d’ -AddressPrefix $locprefix -Asn $LNGASN -BgpPeeringAddress $BGPPeerIP5
# get local network gateway
$local = Get-AzureRmLocalNetworkGateway -Name $gwlocal -ResourceGroupName $rg
# connect the two
New-AzureRmVirtualNetworkGatewayConnection -Name westeurtohome -ResourceGroupName $rg -Location $loc -VirtualNetworkGateway1 $gateway1 -LocalNetworkGateway2 $local -ConnectionType IPsec -RoutingWeight 10 -SharedKey ‘abc1234’-enablebgp $true

This should leave you with a Standard BGP enabled gateway in VNet vnhub0: