diff --git a/repos/os/src/server/nic_router/domain.cc b/repos/os/src/server/nic_router/domain.cc
index 25b5001c90..e6e966f167 100644
--- a/repos/os/src/server/nic_router/domain.cc
+++ b/repos/os/src/server/nic_router/domain.cc
@@ -118,8 +118,19 @@ void Domain::discard_ip_config()
 
 void Domain::ip_config_from_dhcp_ack(Dhcp_packet &dhcp_ack)
 {
+	/*
+	 * If the IP config didn't change (a common case on DHCP RENEW), prevent
+	 * detaching from the old config and attaching to the new one. Because this
+	 * would not only create unnecessary CPU overhead but also force all
+	 * clients at all interfaces that are listening to this config (via config
+	 * attribute 'dns_config_from') to restart their networking (re-do DHCP).
+	 */
+	Ipv4_config const new_ip_config { dhcp_ack, _alloc, *this };
+	if (*_ip_config == new_ip_config) {
+		return;
+	}
 	_reconstruct_ip_config([&] (Reconstructible<Ipv4_config> &ip_config) {
-		ip_config.construct(dhcp_ack, _alloc, *this); });
+		ip_config.construct(new_ip_config); });
 }
 
 
diff --git a/repos/os/src/server/nic_router/ipv4_config.cc b/repos/os/src/server/nic_router/ipv4_config.cc
index 8234e3ebff..00a131e807 100644
--- a/repos/os/src/server/nic_router/ipv4_config.cc
+++ b/repos/os/src/server/nic_router/ipv4_config.cc
@@ -49,7 +49,27 @@ Ipv4_config::Ipv4_config(Ipv4_config const &ip_config,
 {
 	ip_config.for_each_dns_server([&] (Dns_server const &dns_server) {
 		Dns_server::construct(
-			alloc, dns_server.ip(),
+			_alloc, dns_server.ip(),
+			[&] /* handle_success */ (Dns_server &server)
+			{
+				_dns_servers.insert_as_tail(server);
+			},
+			[&] /* handle_failure */ () { }
+		);
+	});
+	_dns_domain_name.set_to(ip_config.dns_domain_name());
+}
+
+
+Ipv4_config::Ipv4_config(Ipv4_config const &ip_config)
+:
+	_alloc      { ip_config._alloc },
+	_interface  { ip_config._interface },
+	_gateway    { ip_config._gateway }
+{
+	ip_config.for_each_dns_server([&] (Dns_server const &dns_server) {
+		Dns_server::construct(
+			_alloc, dns_server.ip(),
 			[&] /* handle_success */ (Dns_server &server)
 			{
 				_dns_servers.insert_as_tail(server);
diff --git a/repos/os/src/server/nic_router/ipv4_config.h b/repos/os/src/server/nic_router/ipv4_config.h
index a505b11356..2c3ca3d34b 100644
--- a/repos/os/src/server/nic_router/ipv4_config.h
+++ b/repos/os/src/server/nic_router/ipv4_config.h
@@ -59,6 +59,8 @@ class Net::Ipv4_config
 		Ipv4_config(Ipv4_config const &ip_config,
 		            Genode::Allocator &alloc);
 
+		Ipv4_config(Ipv4_config const &ip_config);
+
 		Ipv4_config(Genode::Allocator &alloc);
 
 		~Ipv4_config();
@@ -71,6 +73,11 @@ class Net::Ipv4_config
 			       !_dns_domain_name.equal_to(other._dns_domain_name);
 		}
 
+		bool operator == (Ipv4_config const &other) const
+		{
+			return !(*this != other);
+		}
+
 		template <typename FUNC>
 		void for_each_dns_server(FUNC && func) const
 		{