Domain name resolution, domain name MX record settings effective DOS command detailed

DOS is English http://www.aliyun.com/zixun/aggregation/29800.html ">disk keyboard-based system abbreviation, meaning" Disk operating system ", as the name suggests, DOS is primarily a disk-oriented system software, to put it simply, DOS is a bridge between people and machines, a layer of "shell" outside the machine hardware, and with DOS, we don't have to delve into the hardware structure of the machine, nor do we have to memorize the tedious machine commands. We can easily do most of the day-to-day operations by simply using a few DOS commands that are close to the natural language. In addition, DOS can effectively manage a variety of hardware and software resources, their reasonable scheduling, all software and hardware in the DOS monitoring and management, methodically carry out their work.

Generally speaking, DOS has two different concepts, namely, denial of service or a disk operating system, usually DOS (o lowercase) refers to denial of service, DOS (o uppercase) refers to a disk operating system.

Let's take a look at whether a domain name is parsed, how many domain name resolution servers are, and whether the MX record for the domain name takes effect.

In the lower left corner of the computer "Start" menu "Run" input cmd, enter, enter the DOS interface

1, query the domain name is resolved successfully: Enter ping domain name

C:\>ping www.9zhan.com

Pinging www.9zhan.com [125.65.110.209] with bytes of DA

Reply from 125.65.110.209:bytes=32 time=66ms ttl=54

Reply from 125.65.110.209:bytes=32 time=62ms ttl=54

Ping statistics for 125.65.110.209:

Packets:sent = 4, Received = 4, Lost = 0 (vs loss),

Approximate round trips times in Milli-seconds:

Minimum = 61ms, Maximum = 66ms, Average = 62ms

125.65.110.209 for the current domain name resolution to the IP, check you need to resolve to the IP is consistent with the IP to indicate whether the resolution succeeded.

Reply from indicates that the IP is currently unobstructed

time=66ms that the IP ping value is 66 milliseconds, is a normal latency, the network is in good condition, but not the best in 10-40ms.

4 consecutive reply said no switch, the network is normal.

2, Query the domain name DNS (resolution Server) is how many: input nslookup press ENTER

And then enter

Set Q=ns Press ENTER

Domain Name Press ENTER

For example:

C:\>nslookup

Default server:125.65.110.209 ns5.volit.com

address:125.65.110.209

> Set Q=ns

> 9zhan.com

server:125.65.110.209 ns5.volit.com

address:125.65.110.209

Non-authoritative Answer:

9zhan.com nameserver = ns5.volit.com

You can see 9zhan.com this domain has DNS resolution and belongs to Volit.com

3, query the domain name of the mailbox MX record:

Enter Nslookup press ENTER

And then in the input

Set Q=MX Press ENTER

Re-enter

Domain Name Press ENTER

For example:

C:\>nslookup

Default server:125.65.110.209 ns5.volit.com

address:125.65.110.209

> Set Q=MX

> 9zhan.com

server:125.65.110.209 ns5.volit.com

address:125.65.110.209

Non-authoritative Answer:

9zhan.com MX preference = ten, mail e-gold = ns5.volit.com

You can see mail e-gold = ns5.volit.com. Indicates that the MX record for the domain name is, that is, the domain MX record is in effect