diff --git a/TunnelKit/Sources/AppExtension/TunnelKitProvider.swift b/TunnelKit/Sources/AppExtension/TunnelKitProvider.swift
index 47d5405..8f83a63 100644
--- a/TunnelKit/Sources/AppExtension/TunnelKitProvider.swift
+++ b/TunnelKit/Sources/AppExtension/TunnelKitProvider.swift
@@ -535,8 +535,14 @@ extension TunnelKitProvider: SessionProxyDelegate {
             ipv6Settings?.excludedRoutes = []
         }
         
-        let dnsSettings = NEDNSSettings(servers: cfg.sessionConfiguration.dnsServers ?? reply.options.dnsServers)
-        
+        let dnsServers = cfg.sessionConfiguration.dnsServers ?? reply.options.dnsServers
+        let searchDomain = cfg.sessionConfiguration.searchDomain ?? reply.options.searchDomain
+        let dnsSettings = NEDNSSettings(servers: dnsServers)
+        dnsSettings.domainName = searchDomain
+        if let searchDomain = searchDomain {
+            dnsSettings.searchDomains = [searchDomain]
+        }
+
         let newSettings = NEPacketTunnelNetworkSettings(tunnelRemoteAddress: remoteAddress)
         newSettings.ipv4Settings = ipv4Settings
         newSettings.ipv6Settings = ipv6Settings
diff --git a/TunnelKit/Sources/Core/OptionsBundle.swift b/TunnelKit/Sources/Core/OptionsBundle.swift
index 7e28626..c0bb447 100644
--- a/TunnelKit/Sources/Core/OptionsBundle.swift
+++ b/TunnelKit/Sources/Core/OptionsBundle.swift
@@ -87,6 +87,8 @@ public struct OptionsBundle {
         
         static let dns = NSRegularExpression("^dhcp-option +DNS6? +[\\d\\.a-fA-F:]+")
         
+        static let domain = NSRegularExpression("^dhcp-option +DOMAIN +[^ ]+")
+        
         // MARK: Unsupported
         
 //        static let fragment = NSRegularExpression("^fragment +\\d+")
@@ -181,6 +183,9 @@ public struct OptionsBundle {
     /// The DNS servers.
     public let dnsServers: [String]
 
+    /// The search domain.
+    public let searchDomain: String?
+    
     /**
      Parses options from an array of lines.
      
@@ -225,6 +230,7 @@ public struct OptionsBundle {
         var optRoutes4: [(String, String, String?)] = [] // address, netmask, gateway
         var optRoutes6: [(String, UInt8, String?)] = [] // destination, prefix, gateway
         var optDNSServers: [String] = []
+        var optSearchDomain: String?
 
         log.verbose("Configuration file:")
         for line in lines {
@@ -495,6 +501,12 @@ public struct OptionsBundle {
                 }
                 optDNSServers.append($0[1])
             }
+            Regex.domain.enumerateArguments(in: line) {
+                guard $0.count == 2 else {
+                    return
+                }
+                optSearchDomain = $0[1]
+            }
             
             //
 
@@ -654,6 +666,7 @@ public struct OptionsBundle {
         }
 
         dnsServers = optDNSServers
+        searchDomain = optSearchDomain
     }
         
     private static func normalizeEncryptedPEMBlock(block: inout [String]) {
diff --git a/TunnelKitTests/OptionsBundleTests.swift b/TunnelKitTests/OptionsBundleTests.swift
index c9852af..66af67d 100644
--- a/TunnelKitTests/OptionsBundleTests.swift
+++ b/TunnelKitTests/OptionsBundleTests.swift
@@ -51,11 +51,12 @@ class OptionsBundleTests: XCTestCase {
     }
     
     func testDHCPOption() throws {
-        let lines = base + ["dhcp-option DNS 8.8.8.8", "dhcp-option DNS6 ffff::1"]
+        let lines = base + ["dhcp-option DNS 8.8.8.8", "dhcp-option DNS6 ffff::1", "dhcp-option DOMAIN example.com"]
         XCTAssertNoThrow(try OptionsBundle(from: lines))
         
         let parsed = try! OptionsBundle(from: lines)
         XCTAssertEqual(parsed.dnsServers, ["8.8.8.8", "ffff::1"])
+        XCTAssertEqual(parsed.searchDomain, "example.com")
     }
     
     func testConnectionBlock() throws {