@@ramnivas9148 this show about value (Time to Live)so how long time for caching (temporary storage) for this record in second unit. in this case ip address can be cached or temp storage at the client device or another location for range time (21600) second is 360minute or 6 hour
I am sorry but why you not see this is to fast for explaining something, i am disapointed, take a look at powercert video’s for the right way of doing it