diff --git a/client/src/components/Settings/Dhcp/index.js b/client/src/components/Settings/Dhcp/index.js
index 6208d4a6..a84e0a93 100644
--- a/client/src/components/Settings/Dhcp/index.js
+++ b/client/src/components/Settings/Dhcp/index.js
@@ -102,6 +102,7 @@ const Dhcp = () => {
             Object.values(DHCP_FORM_NAMES)
                 .forEach((formName) => dispatch(destroy(formName)));
             dispatch(resetDhcp());
+            dispatch(getDhcpStatus());
         }
     };
 
diff --git a/client/src/helpers/validators.js b/client/src/helpers/validators.js
index 54bf0341..2ac98a6b 100644
--- a/client/src/helpers/validators.js
+++ b/client/src/helpers/validators.js
@@ -68,6 +68,10 @@ export const validateIpv4 = (value) => {
  * @param allValues
  */
 export const validateNotInRange = (value, allValues) => {
+    if (!allValues.v4) {
+        return undefined;
+    }
+
     const { range_start, range_end } = allValues.v4;
 
     if (range_start && validateIpv4(range_start)) {
diff --git a/internal/dhcpd/http.go b/internal/dhcpd/http.go
index 990d3c7c..e016dee8 100644
--- a/internal/dhcpd/http.go
+++ b/internal/dhcpd/http.go
@@ -8,10 +8,12 @@ import (
 	"net/http"
 	"os"
 	"strings"
+	"time"
 
 	"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
 	"github.com/AdguardTeam/golibs/errors"
 	"github.com/AdguardTeam/golibs/log"
+	"github.com/AdguardTeam/golibs/timeutil"
 )
 
 func httpError(r *http.Request, w http.ResponseWriter, code int, format string, args ...interface{}) {
@@ -533,6 +535,13 @@ func (s *Server) handleDHCPRemoveStaticLease(w http.ResponseWriter, r *http.Requ
 	}
 }
 
+const (
+	// DefaultDHCPLeaseTTL is the default time-to-live for leases.
+	DefaultDHCPLeaseTTL = uint32(timeutil.Day / time.Second)
+	// DefaultDHCPTimeoutICMP is the default timeout for waiting ICMP responses.
+	DefaultDHCPTimeoutICMP = 1000
+)
+
 func (s *Server) handleReset(w http.ResponseWriter, r *http.Request) {
 	err := s.Stop()
 	if err != nil {
@@ -547,19 +556,24 @@ func (s *Server) handleReset(w http.ResponseWriter, r *http.Request) {
 	}
 
 	oldconf := s.conf
-	s.conf = ServerConfig{}
-	s.conf.WorkDir = oldconf.WorkDir
-	s.conf.HTTPRegister = oldconf.HTTPRegister
-	s.conf.ConfigModified = oldconf.ConfigModified
-	s.conf.DBFilePath = oldconf.DBFilePath
+	s.conf = ServerConfig{
+		WorkDir:        oldconf.WorkDir,
+		HTTPRegister:   oldconf.HTTPRegister,
+		ConfigModified: oldconf.ConfigModified,
+		DBFilePath:     oldconf.DBFilePath,
+	}
 
-	v4conf := V4ServerConf{}
-	v4conf.ICMPTimeout = 1000
-	v4conf.notify = s.onNotify
+	v4conf := V4ServerConf{
+		LeaseDuration: DefaultDHCPLeaseTTL,
+		ICMPTimeout:   DefaultDHCPTimeoutICMP,
+		notify:        s.onNotify,
+	}
 	s.srv4, _ = v4Create(v4conf)
 
-	v6conf := V6ServerConf{}
-	v6conf.notify = s.onNotify
+	v6conf := V6ServerConf{
+		LeaseDuration: DefaultDHCPLeaseTTL,
+		notify:        s.onNotify,
+	}
 	s.srv6, _ = v6Create(v6conf)
 
 	s.conf.ConfigModified()
diff --git a/internal/home/config.go b/internal/home/config.go
index 44afe953..3465c26f 100644
--- a/internal/home/config.go
+++ b/internal/home/config.go
@@ -232,9 +232,9 @@ func initConfig() {
 	config.DNS.DnsfilterConf.CacheTime = 30
 	config.Filters = defaultFilters()
 
-	config.DHCP.Conf4.LeaseDuration = 86400
-	config.DHCP.Conf4.ICMPTimeout = 1000
-	config.DHCP.Conf6.LeaseDuration = 86400
+	config.DHCP.Conf4.LeaseDuration = dhcpd.DefaultDHCPLeaseTTL
+	config.DHCP.Conf4.ICMPTimeout = dhcpd.DefaultDHCPTimeoutICMP
+	config.DHCP.Conf6.LeaseDuration = dhcpd.DefaultDHCPLeaseTTL
 
 	if ch := version.Channel(); ch == version.ChannelEdge || ch == version.ChannelDevelopment {
 		config.BetaBindPort = 3001