FEZ Spider MF 4.1 and 4.2 Networking differences

I upgraded one of the two FEZ Spider boards I have to Version 4.2 of the .NETMF and this has caused some problems with the MF Deploy Network Configuration and also broke some networking code.

The MFDeploy Network configuration save fails with “Invalid configuration data from Plug-In” which others in the GHI Forums have also encountered e.g. http://www.tinyclr.com/forum/topic?id=9661

When I ran up my code the client IP address, gateway address etc. weren’t getting setup properly, My home network uses DHCP and this was fixed with .EnableDhcp(). I then noticed that the DNS address was not what I was expecting. It was pointing to one of the OpenDNS project servers. This was fixed by the .EnableDynamicDns();

This code works with V4.1

// This could be configured via MFDeploy

// error checking etc. removed

Debug.Print("Client IP address:" + networkInterface.IPAddress.ToString());
Debug.Print("MAC Address: " + BytesToHexString(networkInterface.PhysicalAddress));
Debug.Print("IP Address: " + networkInterface.IPAddress.ToString());
Debug.Print("Subnet Mask: " + networkInterface.SubnetMask.ToString());
Debug.Print("Gateway: " + networkInterface.GatewayAddress.ToString());
foreach (string dnsAddress in networkInterface.DnsAddresses)
Debug.Print("DNS Server: " + dnsAddress.ToString());

After some mucking around I found this code works for a Fez SPider running V4.2
static readonly EthernetBuiltIn Ethernet = new EthernetBuiltIn();

void ProgramStarted()

if (!Ethernet.IsActivated)

// This code could be removed once the MFDeploy issue is sorted

// error checking etc. removed

Debug.Print("Client IP address:" + Ethernet.NetworkInterface.IPAddress.ToString());
Debug.Print("MAC Address: " + BytesToHexString( Ethernet.NetworkInterface.PhysicalAddress));
Debug.Print("IP Address: " + Ethernet.NetworkInterface.IPAddress.ToString());
Debug.Print("Subnet Mask: " + Ethernet.NetworkInterface.SubnetMask.ToString());
Debug.Print("Gateway: " + Ethernet.NetworkInterface.GatewayAddress.ToString());
foreach( string dnsAddress in Ethernet.NetworkInterface.DnsAddresses )
Debug.Print("DNS Server: " + dnsAddress.ToString());

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