diff --git a/Tun/Punchnet/SDLUDPHole.swift b/Tun/Punchnet/SDLUDPHole.swift
index 4d65b28..34fcbdf 100644
--- a/Tun/Punchnet/SDLUDPHole.swift
+++ b/Tun/Punchnet/SDLUDPHole.swift
@@ -38,19 +38,6 @@ final class SDLUDPHole: ChannelInboundHandler {
     }
     
     func start() throws -> SocketAddress {
-        switch self.state {
-        case .ready:
-            guard let channel = self.channel else {
-                preconditionFailure("SDLUDPHole is ready but channel is nil")
-            }
-            precondition(channel.localAddress != nil, "UDP channel has no localAddress after bind")
-            return channel.localAddress!
-        case .stopping, .stopped:
-            preconditionFailure("SDLUDPHole cannot be restarted after stop")
-        case .idle:
-            break
-        }
-        
         let bootstrap = DatagramBootstrap(group: group)
             .channelOption(ChannelOptions.socketOption(.so_reuseaddr), value: 1)
             .channelInitializer { channel in