function [status, results] = warplab_networkCheck(numNodes) 
warplab_defines;
status = 0;

TIMEOUT = 3;

%%%% results is a cell array of two elements
%%%%    {1} a struct containing system-level diagnoses
%%%%    {2} an array of structs containing node-level diagnoses
%%%% Note: cell {2} is only populated if system-level checks pass

results{1} = struct('nicSetup',[],'pnet',[]);
%%%% Check that a WARP subnet exists
fprintf('checking set up of computer network interfaces...\n')
if(ispc)
   [status, temp] = system('ipconfig /all');
   temp = strfind(temp,strcat(WARP_subnet,ComputerAddr));
   if(isempty(temp))
       myMsg = sprintf('no interface found for IP %s',strcat(WARP_subnet,ComputerAddr));
       fprintf('----Error! %s\n',myMsg)
       status = -1;
       results{1}.nicSetup = -1;
       return;
   else
       results{1}.nicSetup = 0;
       fprintf('\b ok\n');
   end
elseif(ismac||isunix)
   [status, temp] = system('ifconfig -a');
   temp = strfind(temp,strcat(WARP_subnet,ComputerAddr));
   if(isempty(temp))
       myMsg = sprintf('no interface found for IP %s',strcat(WARP_subnet,ComputerAddr));
       fprintf('----Error! %s\n',myMsg)
       status = -1;
       results{1}.nicSetup = -1;
       return;
   else
       results{1}.nicSetup = 0;
       fprintf('\b ok\n');
   end
end 
%%%%

%%%% Checking Status of pnet Installation
fprintf('checking installation of pnet...\n')
temp = which('pnet');
if(isempty(temp))
    myMsg = 'pnet not found in path';
    fprintf('----Error! %s\n',myMsg)
    status = -1;
    results{1}.pnet = -1;
    return;
elseif(strcmp(temp((end-length(mexext)+1):end),mexext)==0)
    myMsg = 'pnet found, but it is not a compiled mex file';
    fprintf('----Error! %s\n',myMsg)
    status = -1;
    results{1}.pnet = -1;
    return;
else
    results{1}.pnet = 0;
    fprintf('\b ok\n');
end
%%%%

pnet('closeall');

%[socketHandles, packetNum] = warplab_initialize(numNodes);

nodes = 1:numNodes;
IPAddrs = warplab_IP2int(strcat(WARP_subnet,'.0')) + nodes;
UDP_Ports = NodeStartingPort + nodes-1;
packetNum = 1;

syncSock = pnet('udpsocket', SyncPort);
pnet(syncSock, 'setreadtimeout', 1);
pnet(syncSock, 'udpconnect', strcat(WARP_subnet,SyncAddr), SyncPort);
packetNum = 1;

for currNode = 1:numNodes
    nodeStruct(currNode) = struct('serialNumber',[],'fpgaDNA',[],'numRadios',[],'hwGeneration',[],'warplabVersion',[],'respondsToCommands',[],'receivesSync',[]);
    
    %UDP Connections to individual nodes
	thisSock = pnet('udpsocket', UDP_Ports(currNode));
	pnet(thisSock, 'udpconnect', warplab_int2IP(IPAddrs(currNode)), UDP_Ports(currNode));
	pnet(thisSock, 'setreadtimeout', 1);

    disp(sprintf('checking configuration of Node %d...',currNode))
    
%%%% Check to make sure sync packets are being received
    temp = warplab_sendCmd(thisSock, NETWORKCHECK, packetNum);
    warplab_sendSync(syncSock);
    
    if(length(temp)==1)
       if(temp==0)
              myMsg = 'node not responding to commands';
              fprintf('----Error! %s\n',myMsg)
              status = -1;
              nodeStruct(currNode).respondsToCommands = -1;
              continue;
       end
    else
       nodeStruct(currNode).respondsToCommands = 0;
    end
    
    pause(TIMEOUT)
    temp = warplab_sendCmd(thisSock, NETWORKCHECK, packetNum);
    warplab_sendSync(syncSock);
    pause(TIMEOUT)
    if(temp(4)~=1)
        myMsg = 'sync packet not received';
        fprintf('----Error! %s\n',myMsg)
        status = -1;
        nodeStruct(currNode).receivesSync = -1;
    else
        fprintf('\b ok\n');
        nodeStruct(currNode).receivesSync = 0;
    end
%%%%

%%%% Read board information and verify that the latest version of WARPLab
%%%% isbeing used
    temp = warplab_sendCmd(thisSock, BOARDINFO, packetNum);
    nodeStruct(currNode).serialNumber = temp(4);
    nodeStruct(currNode).fpgaDNA = bitshift(temp(5),32)+temp(6);
    nodeStruct(currNode).hwGeneration = bitand(bitshift(temp(7),-24),255);
    nodeStruct(currNode).numRadios = bitand(bitshift(temp(7),-16),255);
    nodeStruct(currNode).warplabVersion = double(bitand(bitshift(temp(7),-8),255))+double(bitand(temp(7),255))/10;
%%%%

end

results{2} = nodeStruct;

fprintf('\n\nResults Summary:\n');
    fprintf('Node | S/N |HWGEN|WLVER|RADIO| ACK | SYNC\n');
for currNode = 1:numNodes
    fprintf('-----------------------------------------\n');
    
    if(nodeStruct(currNode).respondsToCommands==0)
        ackStat = '   OK';
    else
        ackStat = ' FAIL';
    end
    
    if(nodeStruct(currNode).receivesSync==0)
        syncStat = '   OK';
    else
        syncStat = ' FAIL';
    end
    
    if(nodeStruct(currNode).respondsToCommands==0)
        fprintf('%5d|%5d|%5d|%5.1f|%5d|%s|%s\n',currNode,nodeStruct(currNode).serialNumber,nodeStruct(currNode).hwGeneration,nodeStruct(currNode).warplabVersion,nodeStruct(currNode).numRadios,ackStat,syncStat);
    else
        fprintf('%5d|     |     |     |     |%s|%s\n',currNode,ackStat,syncStat);
    end
end


pnet('closeall');