It is set by DNS server, informing the client (resolver) how long it should keep the DNS record in its cache before requesting a new one. When it reduces to 0 (zero), the packet gets dropped and an ICMP packet is sent back to the sender.ĪLSO READ: How to analyze LDAP traffic with Wireshark - Tutorial The TTL value is decreased by 1 every time the packet passes through a layer 3 device. TTL is 1-byte field which can be set to maximum 255. The purpose of TTL in IP headers is to prevent a network packet from circulating indefinitely. It refers to the number of hops that a packet can travel through before it gets discarded by a layer 3 device. Since it is a broad definition, I will break it into 3 categories to explain it better. The generic definition of Time to Live (TTL) refers either life time of a network packet or expiration time of the cached data in a computer.
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