Commands to troubleshoot network problems - you should know this

IPCONFIG. Abbreviation for Internet Protocol configuration, use ipconfig on the windows to the configuration screen of the PCP / IP, including IP addresses, subnet mask, default gateway, DNS server ...

Ipconfig is a command such as problem solving, as shown below

ipconfig / release is used to release the IP configuration of your computer, and prepares the network for a new TCP / IP for.
renew ip config / network with the newConfiguring TCP / IP.

PING. Short for Packet Internet Groper is used to test connectivity between two network devices. The receiver sends an Internet Control Message Protocol, known as an ICMP echo request, the destination node then responds with an ICMP Echo Reply.

PING 127.0.0.1 The IP address is used in combination with the computer to test ping the loopback address. The tool is very useful, and would be the firstto try to network problems never arise. The IP address 127.0.0.1 is a class that the reserve in order to test the network and TCP / IP stack is working fine.

Traceroute and tracert in Windows used to display the location of an IP packet from the source to the destination computer.

TELNET (Telecommunication Network). This is a command used to access another computer remotely. Also known as commandrequest, it is widely used by network administrators. A Telnet application may be accepted or rejected by the remote computer, with the consent may be required for a user name and password. The example below:

Microsoft Telnet> o

(To) 192.168.1.1

Connecting to 192.168.1.1 ...

The telnet command is used on Windows 7, and may be different on other operating systems. Telnet is not enabled by default on Windows 7 and Windows XP, you mustdone through the Control Panel.

Nslookup. Often used by network administrators, nslookup command is a tool used for DNS (Domain Name System) testing and troubleshooting. It is advisable to learn how DNS works before using this command. The example below:

C: \ Users \ Berbie> nslookup "only to illustrate"

Default Server: SE572

Address: 192.168.1.1

Host Name. Used in a truth of platforms, the command usedset up or find the name of a computer or other network device. An example under the windows:

C: \ Users \ Berbie hostname>

Berber PC

ARP. Short for Address Resolution Protocol, ARP is used to find a MAC address or physical address known only when the IP address. The example below:

C: \ arp> Users \ Berbie-a

Interface: 192.168.1.11 --- 0xb

Internet Address Physical Address Type

192.168.1.500-01-E3-EF-69-B0 dynamic

192.168.1.255 FF-FF-FF-FF-FF-FF static

224.0.0.22 01-00-5e-00-00-16 static

network commands are great tools used by computer and network administrators to run the network. The list of commands shown and described above is not exhaustive, there are many more and you should do some research on your own. We saw the basic commands that could help solve the problemswithin the home network or medium.

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How to Trouble-Shoot DNS problems in three easy steps

Solving the problems of DNS is a common challenge for web developers who just may have been exposed to the challenges that the code and databases. If you set up domains on a dedicated server or VPS for the first time and the next challenges will help.

1) The name servers are set for a domain on the domain registrar. To see what name servers are set to control betterwhois.com domain (or another service whois). For example, the domainRackspace domain.info may return the name server DNS1 and dns2.stabletransit.net.

2) In the name of the correct DNS server entries must be established. A "voice", which is normally set to a host name, will have fields like name and IP. For example, as the name and 174.143.155.XX subdomain.domain.info as IP. The IP-IP is the server. You can trouble shoot using: zoneedit.com / lookup.html (linux if you can also use the nslookup command).

Name serversApplications may be brought in the name server. In case of companies such as web hosting server iweb.ca name is hosted on the same server as web server, so that when an account is created in WHM DNS entries are set automatically. If DNS is hosted Rackspace separately so that we have to manually set a DNS entry in their name servers. To Prevent the creation of a large number of entries for each subdomain, asabc.domain.info, def.lbclients.info and so on, received a wildcard for domain.info be established. Then each subdomain will point to the IP of choice (such as VPS).

Again, if you type in your car before subdomain.domain.info find the nameservers for domain.info, check the hostname in the server name, to retrieve from the server IP, and now the final stage: how the server know which directory on the server under the usera?

3) In the case of a Linux server, the httpd.conf file (/ etc / httpd / conf) tells the server where the server where the site can be found. This file contains a series of "virtual hosts". And 'because many so called virtual hosts can be assigned to the same IP (Lange tijd back was not possible in Web server software, but Naam Elke nodig an IP host part). Each virtual machine directive tells the web server where you uploadfile for a particular host name (server name or aliases).

This virtual host directives are automatically created when you create an account in WHM, adding a parked or add-on domain. You can shoot problems watching the httpd.conf file via SSH (pico / etc / httpd / httpd.conf) and looking for the server name or nickname.

Conclusion: If the files do not arrive in a folder when accessing your domain is very likely that there is a problem in one ofabove three steps. In this case, simply use the troubleshooting options described above.

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How to Troubleshoot Your Internet Connection for DSL or Cable Service

One of the common problems among internet users is testing their
internet connection to pinpoint the exact problem. There is a big number of internet users who use DSL, and cable modem service.

You set us your connection the way your ISP (internet service provider)instruct you to. Sometimes, it doesn't work for numerous reasons.

You service is not ready, your hardware in not connected properly, or your ISP is having problems.

Whatever the cause of the problem maybe, there are some diagnostic tools you can use in Windows XP, in order to identify the problem.

If you are not exact in your diagnostic, you will get a good idea at least.

Before we get to the diagnostic tools, let us discuss what is involved in an internet connection.

The information travels over the internet to your computer through your ISP service. This is done through a High speed modem then to a network card installed in your computer.

Your computer is called a host, your service provider will give
you the DNS IP address, and you get your login and password. That is all what you have from your ISP.

Sometimes, your internet connection fails, and you want to find
out the problem. You may be able to fix it, or at least get some
information about the problem to advise your isp for help.

You will start by accessing the command prompt by going in sequence to:

Start menu, program, accessories, then command prompt. A window
will open where you type commands from the prompt.

At the command prompt, you type: IPCONFIG. This command will give you the active network connection on your computer. Here is an example:

PPP adapter Copy :

Connection-specific DNS Suffix . :

IP Address. . . . . . . . . . . . : 68.239.158.45

Subnet Mask . . . . . . . . . . . : 255.255.255.255

Default Gateway . . . . . . . . . : 68.239.158.45

The above output was produced when I ran the Ipconfig command on my own computer running Window XP OS, and A DSL connection. The IP address is my computer address assigned by the ISP.

Please note, you can add an option to this command, in order to get more detailed information about your connection. Here is the output, when I ran the same command with the
"all" option.

Ipconfig /ALL

PPP adapter Copy :

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface

Physical Address. . . . . . . . . : 00-53-45-00-00-00

Dhcp Enabled. . . . . . . . . . . : No

IP Address. . . . . . . . . . . . : 68.239.158.45

Subnet Mask . . . . . . . . . . . : 255.255.255.255

Default Gateway . . . . . . . . . : 68.239.158.45

DNS Servers . . . . . . . . . . . : 151.198.0.39
151.197.0.39
NetBIOS over TCP/IP. . . . . . . . : Disabled

Notice now, the output includes the phisycal address of the network interface card installed in my computer. Also, you see the DNS IP addresses. With the above information, I didn't have any problems.

Supposed ,I disconnect my DSL connection and ran the command again, this is the new result:

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :

IP Address. . . . . . . . . . . . : 192.168.0.1

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . :

Notice in this case, where I disconnected my connection, you don't get a DNS server. This tells you that I am not connected to the internet.

Also, notice the IP address starts with 192.168, which is the default address whenever your computer is not connected to the internet.

Another command is the ping command. It will allow to check if a computer is connected to the network and ready to communicate, whether intranet,
or internet.

Once you run it,it will sent a packet to the computer specified and gives the time it took for the packet to travel. This is an a output when I tried to ping [http://www.yahoo.com:]

C:>ping [http://www.yahoo.com]

Pinging www.yahoo.akadns.net [216.109.118.66] with 32 bytes of data:

Reply from 216.109.118.66: bytes=32 time=35ms TTL=55

Reply from 216.109.118.66: bytes=32 time=39ms TTL=55

Ping statistics for 216.109.118.66:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 35ms, Maximum = 39ms, Average = 38ms.

That shows that the host was reachable, and connected to the internet.

A very important command is the Nslookup. This will let you check if DNS (domain name server) is working properly. The function of the DNS server is to translate ip addresses to domain name of the networked computer. Here is an example:

C:> nslookup [http://www.yahoo.com]

Server: home5.bellatlantic.net

Address: 151.198.0.39

Non-authoritative answer:

Name: [http://www.yahoo.akadns.net]

Addresses: 216.109.118.67

Aliases: [http://www.yahoo.com]

So, you enter the name after Nslookup, it will give you IP addresses and vice versa.

In summary, there more commands in Windows Xp, but using the three above commands should give you a good idea about your internet connection problems. You can find where the problem is occurring. Is it your machine, or the ISP.

Thanks,

George Chamoun

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