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Questions tagged [wireshark]

For questions about Wireshark, a packet analyzer

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Why isn't my computer flooded with Beacon frames?

I used Wireshark to capture IEEE 802.11 Beacon frames in promiscuous mode. I see frames from about a dozen of AP's around me. But I receive them only once in a few seconds, despite AP's having beacon ...
Sgg8's user avatar
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Acknowledgment numbers in Wireshark do not match sequence numbers

Recently, I conducted an experiment involving uploading a file to a server. I noticed that the acknowledgment numbers I received did not align with the sequence numbers. Please refer to the attached ...
nsrdn's user avatar
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Exact difference between EAP and EAPoL

In the PSK authentication method, I see only 4 way handshake packets between supplicant and authenticator. They are called EAPoL in the Wireshark What I know that when EAP is carried over LAN (...
tbhaxor's user avatar
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1 answer
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How can I make wireshark focus on only packets being sent to a website and any responses?

I have captured a few TLS handshakes, I would like to focus on one tls handshake and the communication thereafter. For example, I connect to www.facebook.com and www.pinterest.com how do I tell ...
Benjamin Morales Perez's user avatar
1 vote
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DORA process TCPIP [duplicate]

http://www.tcpipguide.com/free/t_DHCPGeneralOperationandClientFiniteStateMachine.htm I'm reading through the entire Discover, Offer, Request, Acknowledgement phases in DHCP. And I am really confused. ...
Team B.I's user avatar
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In wireshark, why following a TCP or UDP stream does not remove ICMP packets?

In Wireshark, when I follow a TCP or UDP stream using right click -> Follow -> UDP Stream, if there are some ICMP packets from same endpoints, wireshark will keep them in the stream. Why? Since ...
Sourav Kannantha B's user avatar
1 vote
1 answer
312 views

DHCP packets in a Wi-Fi network (WEP2-Personal)

The DHCP packets with the message type Discover, Offer, Request and Acknowledge use the L2 broadcast address for communication (even in the Acknowledge packet which has an IP destination of the newly ...
Strategist's user avatar
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TCP blocked until the acknowledgment received

I am currently facing an issue in my application where the TCP messages seem to be blocked until an acknowledgment received. Specifically, the subsequent messages wait for the acknowledgment of the ...
myprogramistoobusywitherrors's user avatar
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RPCAP active mode usage or deployment example

This is in reference to https://www.winpcap.org/docs/docs_40_2/html/group__remote.html, the RPCAP protocol. Wireshark (on Windows) has support for connecting to passive mode deployment. And the RPCAP ...
David's user avatar
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498 views

Wireshark filter for specific SYN packet which never received a SYN/ACK

Is there a way in wireshark to find out a single SYN that does not get answered by SYN/ACK?
fsociety's user avatar
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2 votes
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Can TCP seq number increment after sending a FIN?

I have an embedded device connecting to a server (on AWS Application ELB if that matters). Both the server and the client are instructed to close the connection after one request. I noticed that the ...
xxljob's user avatar
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Why am I not capturing any ICMP packets on wireshark?

I am doing a lab where we are meant to ping an address and use wireshark to capture ICMP packets when we ping that address. WHen I run the wireshark capture with the ICMP filter on and ping my address,...
Garrett LaCoste's user avatar
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2 answers
153 views

Does ARP play any role when we try to access a website?

I was looking to find the role of ARP whenever say we want to access a website like google.com. I found some answers here. But, when I tried to use Wireshark to check the ARP request I wasn't able to ...
Vedanta Mohapatra's user avatar
3 votes
1 answer
107 views

Wireshark - how to merge packets of Data of a bin file which was sent over the LAN?

I tried to send a ~80k dat file over the LAN from one device to another and then combine the captured packets back to the original file, for testing and learning purposes. I couldn't find any way to ...
Nikita 웃's user avatar
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1 answer
653 views

How to determine which TCP payloads should be combined to form a complete PDU?

I understand that the TCP itself provides a byte stream connection, but has no idea nor does it care what its payload is and how it is segmented to fit into individual packets that travel on the wire. ...
miran80's user avatar
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3 votes
1 answer
110 views

Average bits/s report in tshark

Does tshark has an option to report average bit/s statistics of the capture which appear in Wireshark at the end of Statistics > Capture File Properties? I'm trying to automate a load test and need ...
jackhab's user avatar
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2 votes
1 answer
140 views

Is there a way to precompile data from pcap to speed up booting wireshark?

Is there a way to precompile/precalculate the data from a pcap file to speed up booting wireshark? I have a big pcap file and wireshark is crashing when I try to open it. I know it sums and computes a ...
Bruno Lebtag's user avatar
1 vote
3 answers
360 views

UDP encrypted packets

I am analysing a Wireshark capture as part of understanding UDP/TCP, DNS and HTTP concepts and how packets are sent. I found an interesting sequence of messages in the Wireshark file, but I am not ...
Tita's user avatar
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1 vote
1 answer
11k views

Wireshark not capturing packets?

I am trying to use Wireshark, but for some reason it won't capture packets. I've used it once before and it worked just fine, so I can't understand why it's not working right now. The only thing I've ...
Tita's user avatar
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Where are the characters in Wireshark's Packet Bytes pane?

I've just updated my Wireshark to version 4.0.1, and now, while investigating a TCP communication, I don't see any textual information anymore in the Packet Bytes pane, as you can see from this ...
Dominique's user avatar
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422 views

Monitor UDP packet in wireshark

I am trying to monitor udp packets from server to client in Wireshark at both end. Can I get any clue in Wireshark with which I find out that ok this specific udp packet is what I sent and received at ...
Nifty's user avatar
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1 answer
57 views

Wireshark: Internet Control Message Protocol

I've installed Wireshark on my Windows machine, and to my knowledge, the section at the bottom represents the packets in their octal and ASCII form. When I click on the IP version & the header ...
oussama101's user avatar
1 vote
1 answer
80 views

troubleshoot pcaps for BACnet industrial protocol in OT/IoT

I have a test bench that I am trying to learn how to take pcaps with WireShark for BACnet UDP traffic of building automation devices. 4 devices in total on test bench: Windows 10 OS running ...
bbartling's user avatar
  • 113
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2 answers
1k views

Monitoring comms between 2 devices on a switch using Wireshark

I am new to networking and now learning wireshark now and unable to capture comms between 2 devices. This is my setup. When I connect to "Ethernet" (Ethernet is the Ethernet port at my PC) ...
GeneCode's user avatar
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1 vote
1 answer
639 views

Does Ethernet have a header and a trailer?

I have read that Ethernet have a header and a trailer, but in Wireshark I can only see an Ethernet header and no Ethernet trailer.
user85108's user avatar
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1 answer
196 views

Wireshark only shows single HTTP request instead of its constituent TCP packets and ACKs

To my understanding, in packet no.39, the post request actually consists of multiple tcp packets getting sent, and they all get acked once by no.40. The server has received it. Now, the server sends ...
JohnDoeyyy's user avatar
0 votes
2 answers
413 views

Determine network traffic on a switch port in bit/s from Wireshark

I am trying to understand how much data is flowing through a specific port on a Cisco (Stratix) switch. I have set up Port Mirroring so that I can capture the traffic on the target port via Wireshark. ...
Greg Smith's user avatar
2 votes
1 answer
2k views

How does wireshark calculate the TCP length when there is no header indiciating such?

In wireshark, you have this field: [TCP Segment Len: 1380] # How is this calculated? My assumption is using the IP headers plus TCP's. TCP Segment Len = IP Total Length - IHL - TCP Header Length In ...
jerry's user avatar
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2 votes
2 answers
125 views

Loops in routers-same packet?

Considering a loop topology between a few routers with a host connected to one of them, when it's default routing directs to the cycle. Even when observing Wireshark, how can we know its the same ...
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479 views

Wireshark: Cannot find frame type of packets

I am getting used to Wireshark operation and currently, I am investigating different frames (control, management, data frame) and using filter in these links (https://mrncciew.com/2014/10/02/cwap-802-...
Nguyen Huy's user avatar
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2 answers
285 views

How to include in the filter http requests satisfying the given condition and the respective responses?

For example, I want to see all the http requests containing the given string in the http.host field and their respective responses. Right now my filter is frame.number < 61403 and http.host ...
mark's user avatar
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1 answer
61 views

What does this Wireshark capture filter do

I was reading through a guide where I saw the following Wireshark capture filter used. (tcp[2:2] > 1500 and tcp[2:2] < 1550) I had a brief look over Wireshark's website which listed their ...
questioner's user avatar
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ARP Header's Mac Address set to 0 when broadcasting [duplicate]

I'm learning about Ethernet frames and networks and Wireshark has been very useful. I have a doubt regarding broadcasting and ARP request, since we don't know the Target MAC address, in the ARP's ...
ad_valle's user avatar
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1 answer
97 views

Wireshark on ProCurve 1810G - IEEE802a protocol

I have recently started a networking course and acquired an old HP ProCurve 1810G-24 Switch to play about with, which I have updated to the latest firmware. I'm using Wireshark to monitor the traffic, ...
Paul Smith's user avatar
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1 answer
116 views

Wireshark -Protocol Hierarchy Omitting large amount of subprotocol traffic

Based on responses, I've repositioned this question to ask why the subprotocols under my TCP header are not accounting for the sum of packet transfer. (I.E TCP= 97.1%, remainder of packet content not ...
N S's user avatar
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0 votes
1 answer
491 views

Probe Request getting\understanding Information Elements (IEs)

I'm trying to read Information Elements (IEs) from the probe request can't seem to understand the stracture of it as I undersatnd it size can be 0-2312 bytes but how do I know how many there are? I ...
Afik_Android's user avatar
3 votes
1 answer
310 views

Wireshark Decrypting IKEv1 Text PSK to Hex

I'm trying to debug a Cisco VPN setup as part of a Uni Lab (so please don't worry about posting of keys etc. it's just a toy setup with no internet facing connection). I want to decrypt the IKEv1 ...
DavidM's user avatar
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0 votes
1 answer
76 views

Unwanted Wireshark Optimizing Received 802.11 Channel for Frames

I am trying to run an experiment which involves monitoring 3 wireless channels simultaneously in Wireshark which would allow me to see a single frame captured 3 times on each channel. To do this, I ...
Taylor Artunian's user avatar
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0 answers
17 views

Some random client requests fails with unexpected TCP [RST] packets [duplicate]

I have a service doing listen that serves clients over a TCP sockets connection with a raw binary protocol. The principle is basic: the connection is established, the client sends a request with data, ...
Ariel's user avatar
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1 vote
1 answer
47 views

what are scenario where re-transmission packets can been seen in wireshark logs

While troubleshooting i came across this challenge ,able to see retransmission packets continuously in packet capture . please let me know in what scenarios this retransmission packets are seen.
user avatar
0 votes
1 answer
154 views

Homeplug av frame

I want to check differences between a frame sent by a pc connected to an homeplug and one pc connected directly with the gateway/router. When i sniff packets i cannot see any differences in the frame, ...
LoyckHope's user avatar
0 votes
2 answers
256 views

Detecting Ethernet over power by packets

If someone plugs an Ethernet over power (EOP, Homeplug) into the switch and then connect elsewhere in the building, can I detect this device by sniffing the packets with tools like Wireshark or ...
LoyckHope's user avatar
0 votes
1 answer
144 views

Wireshark, Bluetooth interface, identify errors in frames/re-transmissions

I'm using WireShark on Ubuntu 20.04.1 LTS. I listen to bluetooth0 interface while transferring a file from my laptop to my smartphone over Bluetooth(using Blueman). Without any transfer, I get packets ...
Aviel Fedida's user avatar
0 votes
1 answer
897 views

Wireshark display filter to hide Protocol = 802.11?

[Note: reposted here from SO...] I've set Wireshark's capture filter set to capture only packets from the MAC address of interest, but the result is dominated by zillions of packets whose Protocol is &...
fearless_fool's user avatar
1 vote
1 answer
624 views

Suspicious flood of ARP requests [closed]

I'm trying to review a Wireshark capture and it seems the network is heavily flooded with ARP requests that make no sense to me. The destination is not "Broadcast", but some unknown DELL ...
Guest's user avatar
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0 answers
126 views

Man in the middle legitimate packet inspection

we're trying to debug a faulty Panasonic Mobile softphone SIP app (both Android & Apple versions), as many calls are randomly dropped unexpectedly. This is the conceptual connection diagram: We ...
Riccardo's user avatar
  • 163
1 vote
1 answer
3k views

How do I set a display filter in wireshark that sorts by destination broadcast?

1 0.000000 Vmware_90:07:7b Broadcast ARP 60 Who has 192.168.185.144? Tell 192.168.185.7 27 0.995837 28.144.7.123 192.168.185.144 HTTP 1177 HTTP/1.1 200 OK (...
Dr. Suess Official's user avatar
0 votes
1 answer
677 views

Capture traffic flowing through a Brocade switch remotely

I am currently doing packet capture through mirroring with Wireshark as mentioned in this post I can mirror the traffic to a port physically jacked into and analyze the packets redirected there w/ ...
Frankie Guzikowski's user avatar
0 votes
3 answers
21k views

how to capture DHCP packets in wireshark

Hy! I want to capture DHCP packets in Wireshark but I did not receive any. Not my filter wrong, I don't get any. So I think I can't trigger the DHCP communications. my filters: dhcp bootp udp.port == ...
Finaria's user avatar
2 votes
1 answer
1k views

IPv4 and UDP/TCP packets inside of ICMP packet?

A week ago, after opening wireshark, i was surprised by seing a storm of ICMP packets from different IP addresses. While deep analysing of thoses packets, i noticed that those ICMP packets contains ...
Yazid's user avatar
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