diff --git a/Source/Core/Common/TraversalClient.cpp b/Source/Core/Common/TraversalClient.cpp
index 071bccbc1c..e34d2cbf2f 100644
--- a/Source/Core/Common/TraversalClient.cpp
+++ b/Source/Core/Common/TraversalClient.cpp
@@ -48,32 +48,32 @@ void TraversalClient::ReconnectToServer()
   }
   m_ServerAddress.port = m_port;
 
-  m_State = Connecting;
+  m_State = State::Connecting;
 
   TraversalPacket hello = {};
-  hello.type = TraversalPacketHelloFromClient;
+  hello.type = TraversalPacketType::HelloFromClient;
   hello.helloFromClient.protoVersion = TraversalProtoVersion;
   SendTraversalPacket(hello);
   if (m_Client)
     m_Client->OnTraversalStateChanged();
 }
 
-static ENetAddress MakeENetAddress(TraversalInetAddress* address)
+static ENetAddress MakeENetAddress(const TraversalInetAddress& address)
 {
-  ENetAddress eaddr;
-  if (address->isIPV6)
+  ENetAddress eaddr{};
+  if (address.isIPV6)
   {
     eaddr.port = 0;  // no support yet :(
   }
   else
   {
-    eaddr.host = address->address[0];
-    eaddr.port = ntohs(address->port);
+    eaddr.host = address.address[0];
+    eaddr.port = ntohs(address.port);
   }
   return eaddr;
 }
 
-void TraversalClient::ConnectToClient(const std::string& host)
+void TraversalClient::ConnectToClient(std::string_view host)
 {
   if (host.size() > sizeof(TraversalHostId))
   {
@@ -81,8 +81,8 @@ void TraversalClient::ConnectToClient(const std::string& host)
     return;
   }
   TraversalPacket packet = {};
-  packet.type = TraversalPacketConnectPlease;
-  memcpy(packet.connectPlease.hostId.data(), host.c_str(), host.size());
+  packet.type = TraversalPacketType::ConnectPlease;
+  memcpy(packet.connectPlease.hostId.data(), host.data(), host.size());
   m_ConnectRequestId = SendTraversalPacket(packet);
   m_PendingConnect = true;
 }
@@ -129,7 +129,7 @@ void TraversalClient::HandleServerPacket(TraversalPacket* packet)
   u8 ok = 1;
   switch (packet->type)
   {
-  case TraversalPacketAck:
+  case TraversalPacketType::Ack:
     if (!packet->ack.ok)
     {
       OnFailure(FailureReason::ServerForgotAboutUs);
@@ -144,8 +144,8 @@ void TraversalClient::HandleServerPacket(TraversalPacket* packet)
       }
     }
     break;
-  case TraversalPacketHelloFromServer:
-    if (m_State != Connecting)
+  case TraversalPacketType::HelloFromServer:
+    if (!IsConnecting())
       break;
     if (!packet->helloFromServer.ok)
     {
@@ -153,14 +153,14 @@ void TraversalClient::HandleServerPacket(TraversalPacket* packet)
       break;
     }
     m_HostId = packet->helloFromServer.yourHostId;
-    m_State = Connected;
+    m_State = State::Connected;
     if (m_Client)
       m_Client->OnTraversalStateChanged();
     break;
-  case TraversalPacketPleaseSendPacket:
+  case TraversalPacketType::PleaseSendPacket:
   {
     // security is overrated.
-    ENetAddress addr = MakeENetAddress(&packet->pleaseSendPacket.address);
+    ENetAddress addr = MakeENetAddress(packet->pleaseSendPacket.address);
     if (addr.port != 0)
     {
       char message[] = "Hello from Dolphin Netplay...";
@@ -176,8 +176,8 @@ void TraversalClient::HandleServerPacket(TraversalPacket* packet)
     }
     break;
   }
-  case TraversalPacketConnectReady:
-  case TraversalPacketConnectFailed:
+  case TraversalPacketType::ConnectReady:
+  case TraversalPacketType::ConnectFailed:
   {
     if (!m_PendingConnect || packet->connectReady.requestId != m_ConnectRequestId)
       break;
@@ -187,8 +187,8 @@ void TraversalClient::HandleServerPacket(TraversalPacket* packet)
     if (!m_Client)
       break;
 
-    if (packet->type == TraversalPacketConnectReady)
-      m_Client->OnConnectReady(MakeENetAddress(&packet->connectReady.address));
+    if (packet->type == TraversalPacketType::ConnectReady)
+      m_Client->OnConnectReady(MakeENetAddress(packet->connectReady.address));
     else
       m_Client->OnConnectFailed(packet->connectFailed.reason);
     break;
@@ -197,10 +197,10 @@ void TraversalClient::HandleServerPacket(TraversalPacket* packet)
     WARN_LOG_FMT(NETPLAY, "Received unknown packet with type {}", packet->type);
     break;
   }
-  if (packet->type != TraversalPacketAck)
+  if (packet->type != TraversalPacketType::Ack)
   {
     TraversalPacket ack = {};
-    ack.type = TraversalPacketAck;
+    ack.type = TraversalPacketType::Ack;
     ack.requestId = packet->requestId;
     ack.ack.ok = ok;
 
@@ -214,7 +214,7 @@ void TraversalClient::HandleServerPacket(TraversalPacket* packet)
 
 void TraversalClient::OnFailure(FailureReason reason)
 {
-  m_State = Failure;
+  m_State = State::Failure;
   m_FailureReason = reason;
 
   if (m_Client)
@@ -257,10 +257,10 @@ void TraversalClient::HandleResends()
 void TraversalClient::HandlePing()
 {
   const u32 now = enet_time_get();
-  if (m_State == Connected && now - m_PingTime >= 500)
+  if (IsConnected() && now - m_PingTime >= 500)
   {
     TraversalPacket ping = {};
-    ping.type = TraversalPacketPing;
+    ping.type = TraversalPacketType::Ping;
     ping.ping.hostId = m_HostId;
     SendTraversalPacket(ping);
     m_PingTime = now;
diff --git a/Source/Core/Common/TraversalClient.h b/Source/Core/Common/TraversalClient.h
index 78e1d0c705..e621a8169a 100644
--- a/Source/Core/Common/TraversalClient.h
+++ b/Source/Core/Common/TraversalClient.h
@@ -6,6 +6,7 @@
 #include <list>
 #include <memory>
 #include <string>
+#include <string_view>
 
 #include <enet/enet.h>
 
@@ -19,17 +20,17 @@ public:
   virtual ~TraversalClientClient() = default;
   virtual void OnTraversalStateChanged() = 0;
   virtual void OnConnectReady(ENetAddress addr) = 0;
-  virtual void OnConnectFailed(u8 reason) = 0;
+  virtual void OnConnectFailed(TraversalConnectFailedReason reason) = 0;
 };
 
 class TraversalClient
 {
 public:
-  enum State
+  enum class State
   {
     Connecting,
     Connected,
-    Failure
+    Failure,
   };
   enum class FailureReason
   {
@@ -46,8 +47,12 @@ public:
   State GetState() const;
   FailureReason GetFailureReason() const;
 
+  bool HasFailed() const { return m_State == State::Failure; }
+  bool IsConnecting() const { return m_State == State::Connecting; }
+  bool IsConnected() const { return m_State == State::Connected; }
+
   void Reset();
-  void ConnectToClient(const std::string& host);
+  void ConnectToClient(std::string_view host);
   void ReconnectToServer();
   void Update();
   void HandleResends();
diff --git a/Source/Core/Common/TraversalProto.h b/Source/Core/Common/TraversalProto.h
index 828d782626..3d8e34de73 100644
--- a/Source/Core/Common/TraversalProto.h
+++ b/Source/Core/Common/TraversalProto.h
@@ -1,44 +1,43 @@
 // This file is public domain, in case it's useful to anyone. -comex
 
 #pragma once
+
 #include <array>
+#include <cstddef>
 #include "Common/CommonTypes.h"
 
-#define NETPLAY_CODE_SIZE 8
-typedef std::array<char, NETPLAY_CODE_SIZE> TraversalHostId;
-typedef u64 TraversalRequestId;
+constexpr size_t NETPLAY_CODE_SIZE = 8;
+using TraversalHostId = std::array<char, NETPLAY_CODE_SIZE>;
+using TraversalRequestId = u64;
 
-enum TraversalPacketType
+enum class TraversalPacketType : u8
 {
   // [*->*]
-  TraversalPacketAck = 0,
+  Ack = 0,
   // [c->s]
-  TraversalPacketPing = 1,
+  Ping = 1,
   // [c->s]
-  TraversalPacketHelloFromClient = 2,
+  HelloFromClient = 2,
   // [s->c]
-  TraversalPacketHelloFromServer = 3,
+  HelloFromServer = 3,
   // [c->s] When connecting, first the client asks the central server...
-  TraversalPacketConnectPlease = 4,
+  ConnectPlease = 4,
   // [s->c] ...who asks the game host to send a UDP packet to the
   // client... (an ack implies success)
-  TraversalPacketPleaseSendPacket = 5,
+  PleaseSendPacket = 5,
   // [s->c] ...which the central server relays back to the client.
-  TraversalPacketConnectReady = 6,
+  ConnectReady = 6,
   // [s->c] Alternately, the server might not have heard of this host.
-  TraversalPacketConnectFailed = 7
+  ConnectFailed = 7,
 };
 
-enum
-{
-  TraversalProtoVersion = 0
-};
+constexpr u8 TraversalProtoVersion = 0;
 
-enum TraversalConnectFailedReason
+enum class TraversalConnectFailedReason : u8
 {
-  TraversalConnectFailedClientDidntRespond = 0,
-  TraversalConnectFailedClientFailure,
-  TraversalConnectFailedNoSuchClient
+  ClientDidntRespond = 0,
+  ClientFailure,
+  NoSuchClient,
 };
 
 #pragma pack(push, 1)
@@ -50,7 +49,7 @@ struct TraversalInetAddress
 };
 struct TraversalPacket
 {
-  u8 type;
+  TraversalPacketType type;
   TraversalRequestId requestId;
   union
   {
@@ -88,7 +87,7 @@ struct TraversalPacket
     struct
     {
       TraversalRequestId requestId;
-      u8 reason;
+      TraversalConnectFailedReason reason;
     } connectFailed;
   };
 };
diff --git a/Source/Core/Common/TraversalServer.cpp b/Source/Core/Common/TraversalServer.cpp
index 80d32d52fa..655e591916 100644
--- a/Source/Core/Common/TraversalServer.cpp
+++ b/Source/Core/Common/TraversalServer.cpp
@@ -185,8 +185,9 @@ static const char* SenderName(sockaddr_in6* addr)
 static void TrySend(const void* buffer, size_t size, sockaddr_in6* addr)
 {
 #if DEBUG
-  printf("-> %d %llu %s\n", ((TraversalPacket*)buffer)->type,
-         (long long)((TraversalPacket*)buffer)->requestId, SenderName(addr));
+  const auto* packet = static_cast<const TraversalPacket*>(buffer);
+  printf("-> %d %llu %s\n", static_cast<int>(packet->type),
+         static_cast<long long>(packet->requestId), SenderName(addr));
 #endif
   if ((size_t)sendto(sock, buffer, size, 0, (sockaddr*)addr, sizeof(*addr)) != size)
   {
@@ -227,7 +228,7 @@ static void ResendPackets()
     {
       if (info->tries >= NUMBER_OF_TRIES)
       {
-        if (info->packet.type == TraversalPacketPleaseSendPacket)
+        if (info->packet.type == TraversalPacketType::PleaseSendPacket)
         {
           todoFailures.push_back(std::make_pair(info->packet.pleaseSendPacket.address, info->misc));
         }
@@ -245,21 +246,22 @@ static void ResendPackets()
   for (const auto& p : todoFailures)
   {
     TraversalPacket* fail = AllocPacket(MakeSinAddr(p.first));
-    fail->type = TraversalPacketConnectFailed;
+    fail->type = TraversalPacketType::ConnectFailed;
     fail->connectFailed.requestId = p.second;
-    fail->connectFailed.reason = TraversalConnectFailedClientDidntRespond;
+    fail->connectFailed.reason = TraversalConnectFailedReason::ClientDidntRespond;
   }
 }
 
 static void HandlePacket(TraversalPacket* packet, sockaddr_in6* addr)
 {
 #if DEBUG
-  printf("<- %d %llu %s\n", packet->type, (long long)packet->requestId, SenderName(addr));
+  printf("<- %d %llu %s\n", static_cast<int>(packet->type),
+         static_cast<long long>(packet->requestId), SenderName(addr));
 #endif
   bool packetOk = true;
   switch (packet->type)
   {
-  case TraversalPacketAck:
+  case TraversalPacketType::Ack:
   {
     auto it = outgoingPackets.find(packet->requestId);
     if (it == outgoingPackets.end())
@@ -267,37 +269,37 @@ static void HandlePacket(TraversalPacket* packet, sockaddr_in6* addr)
 
     OutgoingPacketInfo* info = &it->second;
 
-    if (info->packet.type == TraversalPacketPleaseSendPacket)
+    if (info->packet.type == TraversalPacketType::PleaseSendPacket)
     {
       TraversalPacket* ready = AllocPacket(MakeSinAddr(info->packet.pleaseSendPacket.address));
       if (packet->ack.ok)
       {
-        ready->type = TraversalPacketConnectReady;
+        ready->type = TraversalPacketType::ConnectReady;
         ready->connectReady.requestId = info->misc;
         ready->connectReady.address = MakeInetAddress(info->dest);
       }
       else
       {
-        ready->type = TraversalPacketConnectFailed;
+        ready->type = TraversalPacketType::ConnectFailed;
         ready->connectFailed.requestId = info->misc;
-        ready->connectFailed.reason = TraversalConnectFailedClientFailure;
+        ready->connectFailed.reason = TraversalConnectFailedReason::ClientFailure;
       }
     }
 
     outgoingPackets.erase(it);
     break;
   }
-  case TraversalPacketPing:
+  case TraversalPacketType::Ping:
   {
     auto r = EvictFind(connectedClients, packet->ping.hostId, true);
     packetOk = r.found;
     break;
   }
-  case TraversalPacketHelloFromClient:
+  case TraversalPacketType::HelloFromClient:
   {
     u8 ok = packet->helloFromClient.protoVersion <= TraversalProtoVersion;
     TraversalPacket* reply = AllocPacket(*addr);
-    reply->type = TraversalPacketHelloFromServer;
+    reply->type = TraversalPacketType::HelloFromServer;
     reply->helloFromServer.ok = ok;
     if (ok)
     {
@@ -323,32 +325,34 @@ static void HandlePacket(TraversalPacket* packet, sockaddr_in6* addr)
     }
     break;
   }
-  case TraversalPacketConnectPlease:
+  case TraversalPacketType::ConnectPlease:
   {
     TraversalHostId& hostId = packet->connectPlease.hostId;
     auto r = EvictFind(connectedClients, hostId);
     if (!r.found)
     {
       TraversalPacket* reply = AllocPacket(*addr);
-      reply->type = TraversalPacketConnectFailed;
+      reply->type = TraversalPacketType::ConnectFailed;
       reply->connectFailed.requestId = packet->requestId;
-      reply->connectFailed.reason = TraversalConnectFailedNoSuchClient;
+      reply->connectFailed.reason = TraversalConnectFailedReason::NoSuchClient;
     }
     else
     {
       TraversalPacket* please = AllocPacket(MakeSinAddr(*r.value), packet->requestId);
-      please->type = TraversalPacketPleaseSendPacket;
+      please->type = TraversalPacketType::PleaseSendPacket;
       please->pleaseSendPacket.address = MakeInetAddress(*addr);
     }
     break;
   }
   default:
-    fprintf(stderr, "received unknown packet type %d from %s\n", packet->type, SenderName(addr));
+    fprintf(stderr, "received unknown packet type %d from %s\n", static_cast<int>(packet->type),
+            SenderName(addr));
+    break;
   }
-  if (packet->type != TraversalPacketAck)
+  if (packet->type != TraversalPacketType::Ack)
   {
     TraversalPacket ack = {};
-    ack.type = TraversalPacketAck;
+    ack.type = TraversalPacketType::Ack;
     ack.requestId = packet->requestId;
     ack.ack.ok = packetOk;
     TrySend(&ack, sizeof(ack), addr);
diff --git a/Source/Core/Core/NetPlayClient.cpp b/Source/Core/Core/NetPlayClient.cpp
index a505564c74..f144f77c52 100644
--- a/Source/Core/Core/NetPlayClient.cpp
+++ b/Source/Core/Core/NetPlayClient.cpp
@@ -174,7 +174,7 @@ NetPlayClient::NetPlayClient(const std::string& address, const u16 port, NetPlay
     m_traversal_client = g_TraversalClient.get();
 
     // If we were disconnected in the background, reconnect.
-    if (m_traversal_client->GetState() == TraversalClient::Failure)
+    if (m_traversal_client->HasFailed())
       m_traversal_client->ReconnectToServer();
     m_traversal_client->m_Client = this;
     m_host_spec = address;
@@ -1755,12 +1755,13 @@ void NetPlayClient::OnTraversalStateChanged()
   const TraversalClient::State state = m_traversal_client->GetState();
 
   if (m_connection_state == ConnectionState::WaitingForTraversalClientConnection &&
-      state == TraversalClient::Connected)
+      state == TraversalClient::State::Connected)
   {
     m_connection_state = ConnectionState::WaitingForTraversalClientConnectReady;
     m_traversal_client->ConnectToClient(m_host_spec);
   }
-  else if (m_connection_state != ConnectionState::Failure && state == TraversalClient::Failure)
+  else if (m_connection_state != ConnectionState::Failure &&
+           state == TraversalClient::State::Failure)
   {
     Disconnect();
     m_dialog->OnTraversalError(m_traversal_client->GetFailureReason());
@@ -1779,19 +1780,19 @@ void NetPlayClient::OnConnectReady(ENetAddress addr)
 }
 
 // called from ---NETPLAY--- thread
-void NetPlayClient::OnConnectFailed(u8 reason)
+void NetPlayClient::OnConnectFailed(TraversalConnectFailedReason reason)
 {
   m_connecting = false;
   m_connection_state = ConnectionState::Failure;
   switch (reason)
   {
-  case TraversalConnectFailedClientDidntRespond:
+  case TraversalConnectFailedReason::ClientDidntRespond:
     PanicAlertFmtT("Traversal server timed out connecting to the host");
     break;
-  case TraversalConnectFailedClientFailure:
+  case TraversalConnectFailedReason::ClientFailure:
     PanicAlertFmtT("Server rejected traversal attempt");
     break;
-  case TraversalConnectFailedNoSuchClient:
+  case TraversalConnectFailedReason::NoSuchClient:
     PanicAlertFmtT("Invalid host");
     break;
   default:
diff --git a/Source/Core/Core/NetPlayClient.h b/Source/Core/Core/NetPlayClient.h
index cced924dbb..c0ab68f7f0 100644
--- a/Source/Core/Core/NetPlayClient.h
+++ b/Source/Core/Core/NetPlayClient.h
@@ -125,7 +125,7 @@ public:
 
   void OnTraversalStateChanged() override;
   void OnConnectReady(ENetAddress addr) override;
-  void OnConnectFailed(u8 reason) override;
+  void OnConnectFailed(TraversalConnectFailedReason reason) override;
 
   bool IsFirstInGamePad(int ingame_pad) const;
   int NumLocalPads() const;
diff --git a/Source/Core/Core/NetPlayServer.cpp b/Source/Core/Core/NetPlayServer.cpp
index 503aaecdca..eafddd36e6 100644
--- a/Source/Core/Core/NetPlayServer.cpp
+++ b/Source/Core/Core/NetPlayServer.cpp
@@ -126,7 +126,7 @@ NetPlayServer::NetPlayServer(const u16 port, const bool forward_port, NetPlayUI*
 
     m_server = g_MainNetHost.get();
 
-    if (g_TraversalClient->GetState() == TraversalClient::Failure)
+    if (g_TraversalClient->HasFailed())
       g_TraversalClient->ReconnectToServer();
   }
   else
@@ -190,7 +190,7 @@ void NetPlayServer::SetupIndex()
 
   if (m_traversal_client)
   {
-    if (m_traversal_client->GetState() != TraversalClient::Connected)
+    if (!m_traversal_client->IsConnected())
       return;
 
     session.server_id = std::string(g_TraversalClient->GetHostID().data(), 8);
@@ -1149,7 +1149,7 @@ void NetPlayServer::OnTraversalStateChanged()
   if (!m_dialog)
     return;
 
-  if (state == TraversalClient::Failure)
+  if (state == TraversalClient::State::Failure)
     m_dialog->OnTraversalError(m_traversal_client->GetFailureReason());
 
   m_dialog->OnTraversalStateChanged(state);
diff --git a/Source/Core/Core/NetPlayServer.h b/Source/Core/Core/NetPlayServer.h
index 16034074af..67819be9bf 100644
--- a/Source/Core/Core/NetPlayServer.h
+++ b/Source/Core/Core/NetPlayServer.h
@@ -134,7 +134,7 @@ private:
 
   void OnTraversalStateChanged() override;
   void OnConnectReady(ENetAddress) override {}
-  void OnConnectFailed(u8) override {}
+  void OnConnectFailed(TraversalConnectFailedReason) override {}
   void UpdatePadMapping();
   void UpdateWiimoteMapping();
   std::vector<std::pair<std::string, std::string>> GetInterfaceListInternal() const;
diff --git a/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp b/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp
index c8b19678b3..03626dbb0e 100644
--- a/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp
+++ b/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp
@@ -711,11 +711,11 @@ void NetPlayDialog::UpdateGUI()
   {
     switch (g_TraversalClient->GetState())
     {
-    case TraversalClient::Connecting:
+    case TraversalClient::State::Connecting:
       m_hostcode_label->setText(tr("..."));
       m_hostcode_action_button->setEnabled(false);
       break;
-    case TraversalClient::Connected:
+    case TraversalClient::State::Connected:
     {
       const auto host_id = g_TraversalClient->GetHostID();
       m_hostcode_label->setText(
@@ -725,7 +725,7 @@ void NetPlayDialog::UpdateGUI()
       m_is_copy_button_retry = false;
       break;
     }
-    case TraversalClient::Failure:
+    case TraversalClient::State::Failure:
       m_hostcode_label->setText(tr("Error"));
       m_hostcode_action_button->setText(tr("Retry"));
       m_hostcode_action_button->setEnabled(true);
@@ -1003,6 +1003,7 @@ void NetPlayDialog::OnTraversalStateChanged(TraversalClient::State state)
   case TraversalClient::State::Connected:
   case TraversalClient::State::Failure:
     UpdateDiscordPresence();
+    break;
   default:
     break;
   }