Reduce default interval to 28 seconds

/proc/sys/net/netfilter/nf_conntrack_udp_timeout in Linux is 30 seconds

Author: corny

README.md

@@ -26,7 +26,7 @@ The SRV updater uses raw sockets. Therefore It needs root privilege or `CAP_NET_
   -fqdn string
     	the hostname of the record you want to update (default "_service._tcp.example.com")
   -interval duration
-    	sending interval (default 1m)
+    	sending interval (default 28s)
   -key string
     	private key (default "~/.ssh/id_ed25519")
   -priority uint

main.go

@@ -20,7 +20,7 @@ func main() {
 	flag.UintVar(&packet.Priority, "priority", 10, "the priority of the record you want to update")
 	flag.UintVar(&packet.Weight, "weight", 1, "the weight of the record you want to update")
 
-	interval := flag.Duration("interval", time.Minute, "sending interval")
+	interval := flag.Duration("interval", time.Second*28, "sending interval")
 	keyPath := flag.String("key", "~/.ssh/id_ed25519", "private key")
 	dstPort := flag.Int("dst-port", 55, "the destination port")
 	dstHost := flag.String("dst-host", "dynv6.com", "the destination host")