Weather update proxy in C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using System.Threading;

using ZeroMQ;

namespace Examples
{
static partial class Program
{
public static void WUProxy(string[] args)
{
//
// Weather proxy device
//
// Author: metadings
//

using (var context = new ZContext())
using (var frontend = new ZSocket(context, ZSocketType.XSUB))
using (var backend = new ZSocket(context, ZSocketType.XPUB))
{
// Frontend is where the weather server sits
string localhost = "tcp://127.0.0.1:5556";
Console.WriteLine("I: Connecting to {0}", localhost);
frontend.Connect(localhost);

// Backend is our public endpoint for subscribers
foreach (IPAddress address in WUProxy_GetPublicIPs())
{
var tcpAddress = string.Format("tcp://{0}:8100", address);
Console.WriteLine("I: Binding on {0}", tcpAddress);
backend.Bind(tcpAddress);

var epgmAddress = string.Format("epgm://{0};239.192.1.1:8100", address);
Console.WriteLine("I: Binding on {0}", epgmAddress);
backend.Bind(epgmAddress);
}
using (var subscription = ZFrame.Create(1))
{
subscription.Write(new byte[] { 0x1 }, 0, 1);
backend.Send(subscription);
}

// Run the proxy until the user interrupts us
ZContext.Proxy(frontend, backend);
}
}

static IEnumerable<IPAddress> WUProxy_GetPublicIPs()
{
var list = new List<IPAddress>();
NetworkInterface[] ifaces = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface iface in ifaces)
{
if (iface.NetworkInterfaceType == NetworkInterfaceType.Loopback)
continue;
if (iface.OperationalStatus != OperationalStatus.Up)
continue;

var props = iface.GetIPProperties();
var addresses = props.UnicastAddresses;
foreach (UnicastIPAddressInformation address in addresses)
{
if (address.Address.AddressFamily == AddressFamily.InterNetwork)
list.Add(address.Address);
// if (address.Address.AddressFamily == AddressFamily.InterNetworkV6)
// list.Add(address.Address);
}
}
return list;
}
}
}