To use a display filter with tshark, use the -Y display filter. So if we want to check any IP or website is reachable or not, we can use ping or traceroute which internally use ICMP protocol. Display filters allow you to use Wiresharks powerful multi-pass packet processing capabilities. That means we did not receive any ICMP reply for any ICMP request. Let’s ping some ip address which is not accessible. What happens if IP address is not reqachable: tcp.port4000 sets a filter for any TCP packet with 4000 as a source. See also CaptureFilters: Capture filter is not a display filter. Let’s look into the Identification field inside IPv4. Top 10 Wireshark Filters ip.addr 10.0.0.1 ip.addr10.0.0.1 & ip. Capture filters (like tcp port 80) are not to be confused with display filters (like tcp.port 80). Now let’s see ICMP request and ICMP reply side by side in a picture. Now for the same packet select ICMP part in Wireshark. Also IP layer mentioned the protocol as ICMP. Now select ICMP request packet in Wireshark and look into IPv4 layer.Īs this is ICMP request packet so we can see source IP as my system IP address and destination IP as Google’s one IP address. Number of ICMP reply: From capture we can see there are 4 ICMP reply packets. Number of ICMP request: From capture we can see there are 4 ICMP request packets. Note: We have to put filter ‘icmp’ as we are interested only in ICMP packets. Alternatively, you can click Apply after entering your filter expression. Here is the ICMP request and reply packets for Google ping. For example, type tcp if you want to display all of your TCP packets. Let’s check what happens in Wireshark when we ping to Google or 192.168.1.1. Step5: Stop Wireshark and put “ICMP” as filter in Wireshark. Instead we can do ping to ip address also. That means ICMP request packets = ICMP reply packets. You can create additional filters to refine the scope of your captures. Here is the snapshot for successful ping to Google. Wireshark will automatically capture all RTPS packets from the wire. Ping Make sure you have internet connection or ping will be failedJ.
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