What does ttl mean, what does ttl mean?

TTL is a value in an IP protocol packet that tells the network if a packet has been in the network for too long and should be dropped. There are many reasons why a package cannot be delivered to its destination within a certain period of time. The solution is to discard the packet after a certain period of time and give the sender a message, which the sender decides whether to resend or not.

The initial value of TTL is usually the default value of the system, which is an 8-bit domain in the header. The original idea of TTL was to determine a time frame beyond which packets would be dropped. Since each router has to reduce the TTL domain by at least one, TTL usually represents the maximum number of routers that a packet can pass through before being dropped.

When the count reaches 0, the router decides to drop the packet and sends an ICMP packet to the original sender.

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"ttl" has two meanings:

1. Transistor transistor logic circuits.

The full name of "TTL" is "transistor-transistor logic", which means transistor transistor logic circuit. TTL is a current-controlled device that is often used in circuits and is fast but consumes a lot of power.

2. Survival time value.

The full name of "TTL" is "Time to Live", which means that the DNS record is cached on the DNS server, and the smaller the value, the faster the time for the modification record to take effect.

The TTL value is measured in seconds, and the usual default value is 3600, which means that the default cache is 1 hour.

The main function of TTL is to avoid the infinite looping and sending and receiving of IP packets in the network, save network resources, and enable the sender of IP packets to receive alarm messages.

"ttl"Usually an abbreviation for Time to Live, it is one of the terms in the web world.

ttl=128 means that you can communicate directly with the other party.

ttl=64 communicates across multiple routers.

Ping sends hello packets, based on the ICMP protocol, if there are many routers across the router, it means that the TTL (Time to Live) value is reduced, and each router is subtracted by 1.

In the IPv4 header, TTL is an 8-bit field, as shown in the following figure:

TTL is the lifecycle of a domain name resolution. Let's talk about what TTL means.

How it works:

TTL is an abbreviation for Time to Live, which refers to Time to Live. This field specifies the maximum number of network segments that IP packets are allowed to pass through before they are dropped by the router. Typically, DNS records are stored on DNS servers.

The TTL of a domain name is the time when the local DNS caches the domain name, so you don't have to request an authoritative DNS server every time. This value is usually set to 3600s, which is one hour.

The role of a TTL is to limit the age of IP packets in a computer network. The maximum value for TTL is 255 and the recommended value for TTL is 64.

Shiku 04For users who plan to change their IP address, it is best to reduce the TTL value in advance so that the old domain name records cached on the global DNS server expire quickly and change the TTL value after the IP address is fixed.