Questions tagged [wireshark]

For questions about Wireshark, a packet analyzer

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What are these random IPs connecting to my server [closed]

I recently wrote a chat-program using Java. It follows the client-server-principle, so a client with my client-software is connecting to my server-software, running on a Raspberry Pi with Kali Linux. ...
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1answer
21 views

What's the word of a Transmission Control Protocol port in the Wireshark captured package?

What's the meaning of the dict there? why the port have the paraphrase? you see the Destination port 39578 (39578) do not have.
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41 views

Is it possible to re-transmit only the last packet at TCP flow?

I try to understand the TCP behavior, especially re-transmission. I did a small experiment and find the curious thing. The only last packet is re-transmitted. Why do this happen? I think if the ...
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2answers
40 views

While sniffing with Wireshark, i get lot of ICMP packets in my loop back interface with the word “CKAAAA..” in it, why is this happening? [closed]

So i have a parrot VM, and i tried to use wireshark on the lo interface of it just for fun, now I'm seeing loads of ICMP packets, which seems to be Netbios inside(not sure why is Wireshark naming the ...
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34 views

What's the hook and double hook meaning in wireshark?

What's the hook and double hook meaning in wireshark? you see the two snapshots up there, when I select #7 the #6 will be hooked. when I select the #8, the #5 will be double hooked. What's the ...
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1answer
26 views

Why a NIC in promiscuous mode and not will impact the capture packages?

I have a question about network interface Promiscuous mode, A NIC in promiscuous mode can receive all data passing through it regardless of whether the destination address of the data is it. If the ...
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1answer
18 views

What's the meaning of `[`, `<-` and `->` in wireshark?

When I use the WireShark check the packages: there have three place signs I don't understand. the [ means what? two IPs communicative to each other? but there have other IP in the range. you see the ...
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1answer
51 views

The reason a TCP connection generate retransmission

My question is why a TCP flow make a re-transmission when a network has enough link bandwidth. For finding a cause, I used a wireshark. I got the below captured at a host side (10.0.0.1) 85968 47....
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27 views

Regular failure to capture HTTP2

Wireshark will, at times, capture the HTTP/2 traffic (over TLS) without any trouble. However, more often it fails to capture it at all or will only cature . I suspect that it's unable to unwrap the ...
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37 views

Rebuild video stream of TCP packages

I would like to rebuild a live stream that I captured via WireShark. I receive several decrypted TCP packages but am not able to export them as mp4 file or something similar. Here is an illustration ...
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1answer
53 views

Filtering TCP connections with short duration in Wireshark

How can I filter packets for TCP connections with short duration (e.g. 3 seconds)? I guess there may be something like ip.addr == xxx.xxx.xxx.xxx && (time(tcp.flags.fin==1) - time(tcp.flags....
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Need help reading a Wireshark Trace to Troubleshoot an App's Performance Issue

My company uses a program called Pro Watch that we using for creating employee badges. This program talks to a SQL database that stores everything. When trying to search for a person's name in the ...
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1answer
58 views

why doesn't WireShark show any traffic from invalid certificate https site? [closed]

i have tried mobile apps like HttpCanary and pc programs like wireshark still got nothing from the site !!
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1answer
59 views

TCP sequence numbers in Actual Transmission vs. in Wireshark Capture

Whenever, we do a wireshark capture and Follow--> TCP Stream, we see the sequence numbers as fixed values. In reality, if this were the case, the intruder can easily predict the transmission patterns....
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90 views

How to measure max bandwidth with Wireshark?

I'm trying to measure the max bandwidth usage of my LAN with Wireshark. I´ve done several packet captures but I don't know how to obtain the max bandwidth usage. Any Idea? Thank you in advance
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1answer
78 views

Weird Wireshark protocol list (eth:ethertype:ip:data where is the “udp”?)

I am capturing incoming and outgoing WAN to LAN data at a particular host on my LAN (i.e., the one actually receiving/sending the data). Sometimes I get anomalous captured frames that are missing the ...
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28 views

unable to capture http request on loopback using wireshark

I am running apache2 webserver on my machine. When I try to access a webpage locally through a webbrowser as locahost/index.html then i dont see any packets having protocol http in the capture ...
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44 views

Is this wireshark capture showing any issue?

I used Wireshark to capture the packets bellow: ... 350 18.942762436 d0:07:ca:0b:63:0c -> Broadcast ARP 60 Who has 13.210.32.75? Tell 13.210.32.78 351 18.947224197 d0:07:ca:0b:63:0c -> ...
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1answer
50 views

Wireshark captures TCP packet with no flag [closed]

In our network, I captured a TCP packet by Wireshark that has no flag set. What's that mean? Is it normal?
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26 views

Wireshark logging same error on client and server

I did some testing in Socket Programming with JAVA and analyzed my traffic with wireshark. SetUp: 1 Server running a new ServerSocket(PORT) and 1 Client running a new Socket(IP, PORT). Server and ...
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24 views

Hide/replace certain source and destination IP in Wireshark packet table

For demonstration purposes I need to show Wireshark packet table, but I need to hide some of the IP's there, like show 10.0.0.1 instead of 192.168.1.19. Very old threads suggest using Linux-only tools ...
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36 views

Why do I not see slow start in this TCP packet capture?

I am looking at the packet flow between a server and a client (which is downloading a file from the server). As you can see in the packet capture below (with IP addresses omitted), after the initial ...
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27 views

What do the multiple occurencies mean in a packet trace file?

I have a trace file and I used tshark to find out the number of duplicate ACKs, with the following command: tshark -r file.pcap -T fields -e frame.number -e tcp.analysis.duplicate_ack After some ...
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1answer
153 views

No DHCPOFFER message captured in Wireshark

I am looking for the answer why packet captures in Wireshark doesn't contain DHCP offer message. I was trying to capture packets directly on the computer with installed Wireshark and doing a SPAN ...
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1answer
127 views

IPv6 Wireshark filter for partial IP address

I would like to create a display filter with the last 4 octets of an IPv6 address. Basically, I have the mac address with me and I want to filter for the IP address xxxx:xxxx:xxxx:xxxx:113:5005:80:...
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60 views

Wireshark switch ping

I understand that a switch will broadcast to all ports if it doesn't have the destined destination in its mac address table but when I analysed a scenario in wireshark I got confused at what happened. ...
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1answer
62 views

Wireshark remote hosts

I configured a rip network. I connected two PCS to router 1, router 1 is connected to router 2 and PC 3 is connected to router 2. When I pinged PC 3 and looked at this in wireshark, in the source it ...
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1answer
49 views

switch wireshark arp

I connected 4 pcs to a switch, I used pc 1 to ping another pc(pc 3) and used wireshark on all the pc's. The one that sent the ping sent out an arp request and received 4 request and replies from the ...
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1answer
134 views

How to plot and benchmark UDP response time?

Our application uses UDP protocol in the transport layer. I'm currently filtering the packet trace with the port and then manually checking the RTT by selecting the packet stream and by using " Set ...
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266 views

Modifying linux ping icmp payload [closed]

On analyzing ping request and reply from a windows system to Linux. It was observed that the windows ping request payload was "abcdefghijklmnopqrstuvwabcdefghi" with size 32 bytes Could this ...
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49 views

What is the Acknowledgement number in connection synchronisation between client and server?

I came across this article in an attempt to understand sequence and acknowledgment numbers better. Here is the excerpt: Connection set-up uses the SYN flags. They are not used except for ...
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2k views

Why does Wireshark show Version TLS 1.2 here instead of TLS 1.3?

I'm accessing TLS 1.3 test server "https://tls13.pinterjann.is" via a java http client using TLS 1.3. Everything seems to work fine as the html response indicates: What I don't understand: Why does ...
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1answer
532 views

TCP Window Scaling on Wireshark

i am new to Wireshark and want to find the window scaling, which is the size of the received windows if i am not mistaken. I have a dump file of some 110mb that i use for my graphs. This is the ...
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1answer
58 views

IPV6 ping, the pinged address is different from the once caught by wireshark

I'm trying to ping an ECU, both PC and ECU have static IPV6 address the problem is that the target address (ECU) pinged is different from the one caught by Wireshark subnet : 64 ping command $ ...
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29 views

Remote monitoring using a non root user account with Sudo Privilege [closed]

I want to remotely take tcpdump on my server with a non root user account? I tried it but doesnt seems to be working? Can someone guide me on this? plink.exe -ssh -pw abc123 iamuser@192.168.1.1 "sudo ...
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1answer
374 views

How can a UDP Client and a packet sniffer run on the same machine?

In my understanding, if you have a UDP socket client that is bound to a particular port, then a second UDP client on the same machine can't bind to the same port. If this is the case, then how can a ...
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2answers
238 views

tcp connection and stream flow question

Could anyone explain the main principe of tcp flow when making a session ? I have take a tcp dump when i'm trying to browse a site. when I analyse the packet by wireshark, i have found many Three way ...
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1answer
29 views

Where I can find frame specification?

When I capture from wireshark traffic I can see data like this Where I can see the specification of each field? When I read wiki https://en.wikipedia.org/wiki/Ethernet_frame there is nothing like ...
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2answers
585 views

Calculating the throughput of a given TCP connection

Given a TCP session, is there a way to determine the throughput of the sender? I have a wireshark sniff, and I see that to calculate the throughput of the sender I can use the TCP-Window-Size-in-bits /...
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1answer
197 views

How to differentiate whether Data or QUIC protocol frame follows UDP header? [duplicate]

I am using Wireshark to analyze network traffic and I need to programmatically differentiate whether Data or QUIC protocol frame follows UDP header. So far, every packet which has source or ...
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1answer
183 views

Wireshark udp checksum errorI

I sniffing udp communication with 2 instance of wireshark , 1: 2.0.0 2: 2.2.1 . In version 2.0.0 I get valid udp.checksum , but with 2.2.1 I always get udp checksum = 0000 . Why is that? those ...
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1answer
264 views

How to filter a wireshark capture (pcapng) by source and destination IPv4 address

I have a bunch of wireshark captures I need to mine data from. Tshark seems to fit the bill but this doesn't support filtering (-f) by the look of it, I simply get: Using: tshark -x -r Run18....
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1answer
877 views

What does a “Frame” relate to in the WIreshark packet details pane?

Currently learning to use Wireshark. When I take a capture and click on one of it's rows, I see the following breakdown in the "Packet Details" pane: Frame Linux Cooked Capture Internet Protocol ...
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1answer
246 views

ARP requests from outside the network [closed]

I need help understanding an ARP Storm PCAP I'm currently studying. My understating is that routers will strip layer 2 info. Therefore, an ARP request frame will not go through a layer 3 device (...
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1answer
590 views

How to capture ARP Reply packet from all hosts in the network?

How can I capture ARP reply packets from all hosts that are connected in the network? I've tried wireshark premicious mode but it only capture ARP replies from gateway.
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2answers
145 views

Which tcpdump metrics reveal server connectivity problems vs client problems?

I am attempting to diagnose a ~45 sec drop (to 0 Kbps) in the reported RTMP streaming bitrate in OBS while publishing a live stream. I had been running a tcpdump the entire time using Apple's ...
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2answers
227 views

How can i monitor ARP packet on WiFi network?

I want to monitor packet in my network. It said that ARP packet request broadcasted all over network. But why i only see my arp request packet and reply packet to the gateway?
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1answer
125 views

How to emuate simple (telnet-like) network protocol with netcat or similar

I have a barcode sensor (Keyence SR-2000) which is able to talk a simple plaintext-based protocol. I could talk to it with the provided (windows-only) app called AutoID Terminal and ontained wireshark ...
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3answers
107 views

Can Ethernet II frame's Type be Layer1's or Layer4's protocol?

The Ethernet II frame's Type field can be IPv4, ARP, so it can be Layer2 and Layer3's protocol. This is a snapshot of frame captured by WireShark. But I have a question, whether it can be other ...
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1answer
29 views

Does the frame package, all are represent as hex data?

I use Wireshark for capturing packages, get many frames. You see the left light blue background space, all are hex data, and right are converted words we can identify. I mean whether the frame ...