diff --git a/docs/flags.md b/docs/flags.md
index e185f8d137..23f2c0f308 100644
--- a/docs/flags.md
+++ b/docs/flags.md
@@ -63,6 +63,7 @@ These are also available on the `chrome://flags` page.
 
   Feature | Description
   -- | --
+  `Mdns` | Enables mDNS and Service Discovery.
   `MinimalReferrers` | Removes all cross-origin referrers and strips same-origin referrers down to the origin. Has lower precedence than `NoCrossOriginReferrers`.
   `NoCrossOriginReferrers` | Removes all cross-origin referrers. Has lower precedence than `NoReferrers`.
   `NoReferrers` | Removes all referrers.
diff --git a/flags.gn b/flags.gn
index 8578089ae4..4bc82ae58e 100644
--- a/flags.gn
+++ b/flags.gn
@@ -3,13 +3,11 @@ chrome_pgo_phase=0
 clang_use_chrome_plugins=false
 disable_fieldtrial_testing_config=true
 enable_hangout_services_extension=false
-enable_mdns=false
 enable_mse_mpeg2ts_stream_parser=true
 enable_nacl=false
 enable_reading_list=false
 enable_remoting=false
 enable_reporting=false
-enable_service_discovery=false
 enable_widevine=true
 exclude_unwind_tables=true
 google_api_key=""
diff --git a/patches/extra/ungoogled-chromium/add-flag-to-enable-mdns.patch b/patches/extra/ungoogled-chromium/add-flag-to-enable-mdns.patch
new file mode 100644
index 0000000000..8d91b90161
--- /dev/null
+++ b/patches/extra/ungoogled-chromium/add-flag-to-enable-mdns.patch
@@ -0,0 +1,99 @@
+--- a/chrome/browser/ungoogled_flag_entries.h
++++ b/chrome/browser/ungoogled_flag_entries.h
+@@ -132,4 +132,8 @@
+      "Minimal Referrers",
+      "Removes all cross-origin referrers and strips same-origin referrers down to the origin. Has lower precedence than remove-cross-origin-referrers. ungoogled-chromium flag.",
+      kOsAll, FEATURE_VALUE_TYPE(features::kMinimalReferrers)},
++    {"enable-mdns",
++     "Enable mDNS",
++     "Enables mDNS and Service Discovery. ungoogled-chromium flag.",
++     kOsAll, FEATURE_VALUE_TYPE(network::features::kMdns)},
+ #endif  // CHROME_BROWSER_UNGOOGLED_FLAG_ENTRIES_H_
+--- a/net/dns/host_resolver_manager.cc
++++ b/net/dns/host_resolver_manager.cc
+@@ -110,6 +110,7 @@
+ #include "net/log/net_log_with_source.h"
+ #include "net/socket/client_socket_factory.h"
+ #include "net/url_request/url_request_context.h"
++#include "services/network/public/cpp/features.h"
+ #include "third_party/abseil-cpp/absl/types/optional.h"
+ #include "third_party/abseil-cpp/absl/types/variant.h"
+ #include "url/scheme_host_port.h"
+@@ -179,6 +180,8 @@ bool ContainsIcannNameCollisionIp(const
+ 
+ // True if |hostname| ends with either ".local" or ".local.".
+ bool ResemblesMulticastDNSName(base::StringPiece hostname) {
++  if (!base::FeatureList::IsEnabled(network::features::kMdns))
++    return false;
+   return base::EndsWith(hostname, ".local") ||
+          base::EndsWith(hostname, ".local.");
+ }
+--- a/net/dns/mdns_client_impl.cc
++++ b/net/dns/mdns_client_impl.cc
+@@ -26,6 +26,7 @@
+ #include "net/dns/public/util.h"
+ #include "net/dns/record_rdata.h"
+ #include "net/socket/datagram_socket.h"
++#include "services/network/public/cpp/features.h"
+ #include "third_party/abseil-cpp/absl/types/optional.h"
+ 
+ // TODO(gene): Remove this temporary method of disabling NSEC support once it
+@@ -455,6 +456,8 @@ MDnsClientImpl::~MDnsClientImpl() {
+ }
+ 
+ int MDnsClientImpl::StartListening(MDnsSocketFactory* socket_factory) {
++  if (!base::FeatureList::IsEnabled(network::features::kMdns))
++    return ERR_ABORTED;
+   DCHECK(!core_.get());
+   core_ = std::make_unique<Core>(clock_, cleanup_timer_.get());
+   int rv = core_->Init(socket_factory);
+--- a/services/network/p2p/socket_manager.cc
++++ b/services/network/p2p/socket_manager.cc
+@@ -8,6 +8,7 @@
+ 
+ #include <utility>
+ 
++#include "base/feature_list.h"
+ #include "base/functional/bind.h"
+ #include "base/memory/raw_ptr.h"
+ #include "base/task/single_thread_task_runner.h"
+@@ -29,6 +30,7 @@
+ #include "net/url_request/url_request_context_getter.h"
+ #include "services/network/p2p/socket.h"
+ #include "services/network/proxy_resolving_client_socket_factory.h"
++#include "services/network/public/cpp/features.h"
+ #include "services/network/public/cpp/p2p_param_traits.h"
+ #include "third_party/abseil-cpp/absl/types/optional.h"
+ #include "third_party/webrtc/media/base/rtp_utils.h"
+@@ -114,7 +116,7 @@ class P2PSocketManager::DnsRequest {
+     net::HostPortPair host(host_name_, 0);
+ 
+     net::HostResolver::ResolveHostParameters parameters;
+-    if (enable_mdns_ && HasLocalTld(host_name_)) {
++    if (enable_mdns_ && HasLocalTld(host_name_) && base::FeatureList::IsEnabled(features::kMdns)) {
+ #if BUILDFLAG(ENABLE_MDNS)
+       // HostResolver/MDnsClient expects a key without a trailing dot.
+       host.set_host(host_name_.substr(0, host_name_.size() - 1));
+--- a/services/network/public/cpp/features.cc
++++ b/services/network/public/cpp/features.cc
+@@ -14,6 +14,10 @@
+ 
+ namespace network::features {
+ 
++BASE_FEATURE(kMdns,
++             "Mdns",
++             base::FEATURE_DISABLED_BY_DEFAULT);
++
+ BASE_FEATURE(kNetworkErrorLogging,
+              "NetworkErrorLogging",
+              base::FEATURE_ENABLED_BY_DEFAULT);
+--- a/services/network/public/cpp/features.h
++++ b/services/network/public/cpp/features.h
+@@ -13,6 +13,7 @@
+ namespace network {
+ namespace features {
+ 
++COMPONENT_EXPORT(NETWORK_CPP) BASE_DECLARE_FEATURE(kMdns);
+ COMPONENT_EXPORT(NETWORK_CPP) BASE_DECLARE_FEATURE(kNetworkErrorLogging);
+ COMPONENT_EXPORT(NETWORK_CPP) BASE_DECLARE_FEATURE(kReporting);
+ COMPONENT_EXPORT(NETWORK_CPP) BASE_DECLARE_FEATURE(kThrottleDelayable);
diff --git a/patches/extra/ungoogled-chromium/fix-building-without-mdns-and-service-discovery.patch b/patches/extra/ungoogled-chromium/fix-building-without-mdns-and-service-discovery.patch
deleted file mode 100644
index 2b0ee0bcb5..0000000000
--- a/patches/extra/ungoogled-chromium/fix-building-without-mdns-and-service-discovery.patch
+++ /dev/null
@@ -1,42 +0,0 @@
-# Fix building with enable_service_discovery=false and enable_mds=false
-
---- a/chrome/browser/media/router/discovery/mdns/dns_sd_device_lister.cc
-+++ b/chrome/browser/media/router/discovery/mdns/dns_sd_device_lister.cc
-@@ -40,37 +40,22 @@ DnsSdDeviceLister::DnsSdDeviceLister(
- DnsSdDeviceLister::~DnsSdDeviceLister() {}
- 
- void DnsSdDeviceLister::Discover() {
--#if BUILDFLAG(ENABLE_SERVICE_DISCOVERY)
--  if (!device_lister_) {
--    device_lister_ = local_discovery::ServiceDiscoveryDeviceLister::Create(
--        this, service_discovery_client_, service_type_);
--    device_lister_->Start();
--  }
--  device_lister_->DiscoverNewDevices();
--#endif
- }
- 
- void DnsSdDeviceLister::Reset() {
--  device_lister_.reset();
- }
- 
- void DnsSdDeviceLister::OnDeviceChanged(
-     const std::string& service_type,
-     bool added,
-     const ServiceDescription& service_description) {
--  DnsSdService service;
--  FillServiceInfo(service_description, &service);
--  delegate_->ServiceChanged(device_lister_->service_type(), added, service);
- }
- 
- void DnsSdDeviceLister::OnDeviceRemoved(const std::string& service_type,
-                                         const std::string& service_name) {
--  delegate_->ServiceRemoved(service_type, service_name);
- }
- 
- void DnsSdDeviceLister::OnDeviceCacheFlushed(const std::string& service_type) {
--  delegate_->ServicesFlushed(device_lister_->service_type());
--  device_lister_->DiscoverNewDevices();
- }
- 
- }  // namespace media_router
diff --git a/patches/series b/patches/series
index bda5ac7b95..deaa0e94d5 100644
--- a/patches/series
+++ b/patches/series
@@ -59,7 +59,6 @@ extra/ungoogled-chromium/remove-disable-setuid-sandbox-as-bad-flag.patch
 extra/ungoogled-chromium/disable-intranet-redirect-detector.patch
 extra/ungoogled-chromium/enable-page-saving-on-more-pages.patch
 extra/ungoogled-chromium/disable-download-quarantine.patch
-extra/ungoogled-chromium/fix-building-without-mdns-and-service-discovery.patch
 extra/ungoogled-chromium/add-flag-to-configure-extension-downloading.patch
 extra/ungoogled-chromium/add-flag-for-search-engine-collection.patch
 extra/ungoogled-chromium/add-flag-to-disable-beforeunload.patch
@@ -104,3 +103,4 @@ extra/ungoogled-chromium/add-flags-for-referrer-customization.patch
 extra/ungoogled-chromium/default-webrtc-ip-handling-policy.patch
 extra/ungoogled-chromium/add-flags-for-existing-switches.patch
 extra/ungoogled-chromium/first-run-page.patch
+extra/ungoogled-chromium/add-flag-to-enable-mdns.patch