Capture filters: This type of filter set before start capturing traffic in Wireshark. This type of filter can’t change while capturing traffic. It is generally used for capturing a specific type of traffic.

Example:

Capture only traffic to or from IP address 172.18.5.4:

host 172.18.5.4

Capture traffic to or from a range of IP addresses:

net 192.168.0.0/24

Display Filters: This type of filter is used to reduce the packets which are showing in Wireshark. This type of filter can be changed while capturing traffic.  It is generally used for hiding traffic to analyze the specific type of traffic.

Example:

Show only SMTP (port 25) and ICMP traffic:

Display only traffic from port number 25 or ICMP packets

tcp.port eq 25 or ICMP

Display only traffic to or from IP address 192.168.0.87

ip.addr == 192.168.0.87

The post Wireshark: Difference between Capture filters and Display Filters first appeared on All About Testing.

tshark is a command-line tool available for users who like black screens. Remember, tshark is the CLI pendant of Wireshark.

It is a perfect example of disruptive technology in the field of networking. Disruptive technology refers to innovation in any field, and creating a new market, disrupts existing players in that field.

Download Link: https://www.wireshark.org/#download

Basic User Interface

Main features of Wireshark

• Deep Packet Inspection of protocols
• Live capture and offline analysis
• Runs on Windows, Linux, OS X, Solaris, and many others (multi-platform)
• Available in both GUI or command mode
• Filters are available to separate protocols
• Output can be exported to XML, PostScript, CSV, or plain text
• Read/write many different capture file formats: tcpdump (libpcap), Pcap NG, and many others
• Capture files compressed with gzip can be decompressed on the fly
• Live data can be read from Ethernet, IEEE 802.11, PPP/HDLC, ATM, Bluetooth, USB, Token Ring, Frame Relay, FDDI, and others (depending on your platform)
• Decryption support for many protocols, including IPsec, ISAKMP, Kerberos, SNMPv3, SSL/TLS, WEP, and WPA/WPA2
• Different coloring rules to identify problems

Conclusion

Wireshark is an awesome network analyzer that helps in understanding and analyzing network traffic. This tool is a one-stop solution to diagnose problems in a network. If you want to use a command-line equivalent tool for the same, use tshark.

tcpdump is another command-line tool for analyzing network protocols.

The post Wireshark: Basic Tutorial first appeared on All About Testing.