10 Useful Networking Tips to Know

Παρακάτω θα δούμε μερικές χρήσιμες εντολές networking που είναι προεγκατεστημένες στον σας και θα σας βοηθήσουν να γνωρίζετε τα πάντα για έναν ιστότοπο.

Ποια είναι η διεύθυνση IP μου; Ποιος είναι ο host μιας ιστοσελίδας; Ποια υπηρεσία αλληλογραφίας χρησιμοποιεί αυτό το domain; Υπάρχουν εργαλεία στο που μπορούν να αποκαλύψουν αυτές τις λεπτομέρειες, αλλά αυτό μπορεί να γίνει χρησιμοποιώντας τη γραμμή εντολών στον υπολογιστή σας (Linux-Mac).

What is my IP address?

curl https://checkip.amazonaws.com

Κάντε ένα αίτημα με curl ή με wget στο checkip.amazonaws.com και θα δείτε τη δημόσια διεύθυνση IP του υπολογιστή σας. Μπορείτε επίσης να ανοίξετε την σελίδα whatismyip.akamai.com της Akamai και θα δείτε την σας διεύθυνση IP.

What is my private IP address?

ifconfig en0 | grep inet

Your computer has a private IP address that only works on the local network.

Find the location of the IP address

curl https://ip2c.org/?ip=

The free ip2c service can display the country of an IP address.

Alternatively, use the ipapi service to get more details of an IP address (City name, time zone, and even latitude - longitude associated with an IP address.

curl https://ipapi.co/

Check DNS records

The dig command will help you request any type of DNS records for a domain from the command line.

1. Find the IP address of a website

dig + short .gr

2. Find the domain mail server

The mail exchange (MX) records indicate incoming mail servers used to deliver email messages sent from a domain.

host -t MX iguru.gr

3. Display all the DNS records of a domain

See a list of all the DNS records of a domain, along with the TXT, MX, and other registrations.

dig + nocmd amazon.com any + noall + answer

Making a host page?

Use the dig command to find the IP address of a site, and then use the same dig command to perform a reverse lookup to find the host of that IP address.

For example, this command will display the IP address of Netflix:

dig + short netflix.com A | tail -1

Use the IP address of the next command to view the host name:

dig + nocmd -x + noall + answer

Find the site owner

Use the whois command to reveal important information about any domain. You will see the date on which it was first registered, the contact details of the website owner, the expiration date of the domain, the name of the registrar and more.

whois google.gr

You can also query for recording details of a domain server of a particular register with the flag -h. For example, the following command does a whois lookup on a site using the Google Domains WHOIS server.

whois -h whois.google.com domain.com

Ping network connectivity test

The ping command helps you control if a remote server is accessible and if your machine can connect to it properly.

ping -c 5 -i 2 iguru.gr

The above command pings the server 5 times with a wait of 2 seconds between pings.

Where is the mistake?

If your Internet connection is working, but you can not open a website can be a problem with an intermediate router that does not allow to pass the packets to reach the server.

The traceroute command will show you the way from your local computer to the site from which the traffic must pass. This information can be useful in diagnosing connectivity issues.

traceroute iguru.gr

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Written by giorgos

George still wonders what he's doing here ...

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