From f6e14c7499dc8901ab06f3a5e55ccb367cbe3387 Mon Sep 17 00:00:00 2001
From: Wizou <11647984+wiz0u@users.noreply.github.com>
Date: Fri, 21 Jan 2022 15:22:21 +0100
Subject: [PATCH] Maintain AddressFamily when migrating DCs

---
 README.md     | 2 ++
 src/Client.cs | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 5b0fcc8..7292629 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,8 @@
 
 ## _a Telegram Client API library written 100% in C# and .NET Standard_
 
+This ReadMe is a quick but important tutorial to learn the fundamentals about this library. Please read it all.
+
 # How to use
 
 >⚠️ This library relies on asynchronous C# programming (`async/await`) so make sure you are familiar with this advanced topic before proceeding.  
diff --git a/src/Client.cs b/src/Client.cs
index 6d5f8fb..5d6418d 100644
--- a/src/Client.cs
+++ b/src/Client.cs
@@ -354,7 +354,9 @@ namespace WTelegram
 				{
 					_dcSession.DataCenter = _session.DcOptions.Where(dc => dc.id == TLConfig.this_dc)
 						.OrderByDescending(dc => dc.ip_address == endpoint?.Address.ToString())
-						.ThenByDescending(dc => dc.port == endpoint?.Port).First();
+						.ThenByDescending(dc => dc.port == endpoint?.Port)
+						.ThenByDescending(dc => dc.flags == (endpoint?.AddressFamily == AddressFamily.InterNetworkV6 ? DcOption.Flags.ipv6 : 0))
+						.First();
 					_session.DCSessions[TLConfig.this_dc] = _dcSession;
 				}
 				if (_session.MainDC == 0) _session.MainDC = TLConfig.this_dc;