From 13e76500c250a3731403867bb8888e1f533625db Mon Sep 17 00:00:00 2001
From: Sepalani <sepalani@hotmail.fr>
Date: Mon, 13 Nov 2023 01:24:34 +0400
Subject: [PATCH] BBA/HLE: Fix GC homebrew if_config not working

---
 Source/Core/Core/HW/EXI/BBA/BuiltIn.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Source/Core/Core/HW/EXI/BBA/BuiltIn.cpp b/Source/Core/Core/HW/EXI/BBA/BuiltIn.cpp
index 4782a0a8b0..84c47c3f3c 100644
--- a/Source/Core/Core/HW/EXI/BBA/BuiltIn.cpp
+++ b/Source/Core/Core/HW/EXI/BBA/BuiltIn.cpp
@@ -143,6 +143,12 @@ void CEXIETHERNET::BuiltInBBAInterface::WriteToQueue(const std::vector<u8>& data
 void CEXIETHERNET::BuiltInBBAInterface::HandleARP(const Common::ARPPacket& packet)
 {
   const auto& [hwdata, arpdata] = packet;
+  if (arpdata.sender_address == m_current_mac && arpdata.sender_ip == 0 &&
+      arpdata.target_ip == m_current_ip)
+  {
+    // Ignore ARP probe to itself (RFC 5227) sometimes used to prevent IP collision
+    return;
+  }
   Common::ARPPacket response(m_current_mac, m_router_mac);
   response.arp_header = Common::ARPHeader(arpdata.target_ip, ResolveAddress(arpdata.target_ip),
                                           m_current_ip, m_current_mac);