Here I’m going to list all of the tools I use when I need to do some network troubleshooting…

 

Usefull sites for network connectivity checks

The first one of course is ripe.net which provides a bunchf of handy tools for all kind of network related tests.

• RIPEstat – By given ip address/network it provides a whole bunch of info:
  • Routing
  • DNS
  • Abuse contact
  • Route annoucement history
  • …..
• RIPEAtlas

http://ripe.net

 

Site24x7.com

• Ping
• Traceroute

https://www.site24x7.com/ping-test.html

 

The good old pingdom with it’s tools.

• Traceroute
• Ping
• Save results

http://tools.pingdom.com/ping/

 

Ping.eu

• Ping
• Traceroute

http://ping.eu/ping/

 

Wormly.com

• Ping
• HTTPS tests
• Mail server tests
• FTP tests

https://www.wormly.com/test_remote_ping

 

Websitepulse.com – Currently you can choose from different tools and locations.

• Support different locations (New York, Munich – Germany, Melbourne – Australia)
• Different tools: ping, traceroute, mtr, DNS, email…etc

http://www.websitepulse.com/help/testtools.ping-test.html

 

CloudMonitor.ca.com  – Very nice site, which issues tests from about 90 different locations around the world.

• Ping
• Traceroute
• DNS

https://cloudmonitor.ca.com/en/ping.php

 

Linux Network Tools

 

tcpdump

 

arping

Propagate mac address

The following example is a useful arping command to update all locally connected network devices for a given IP address (1.1.1.1) with your current MAC.

# -I   --> which ethernet interface to use for sending packets
# -A  --> Answer mode 
# -s  --> source IP address
# 255.255.255.255 --> Broadcast the packages

arping -I eth0 -A -s 1.1.1.1 255.255.255.255

 

Get the MAC for a given IP

 

# 192.168.1.1 - The IP address which we want to mac resolve
# -c 3  --> Send 3 pings

arping  -c 3 192.168.1.1

 

 

hping

# *** 
# Send ICMP request(ping) with spoofed source
# 1.1.1.1 - Destination IP 
# 2.2.2.2 - Spoofed source iP
hping 1.1.1.1 --icmp --spoof 2.2.2.2