Questions tagged [wireshark]

For questions about Wireshark, a packet analyzer

Filter by
Sorted by
Tagged with
0 votes
0 answers
13 views

Unusual IRC Traffic Detected on My Home Network: Need Advice on Investigation and Mitigation [closed]

I'm a sysadmin and DevOps engineer and have recently detected some unusual traffic on my home network that has raised my security concerns. I noticed multiple Chromecast streaming options for devices ...
citoyen1337's user avatar
0 votes
0 answers
17 views

Where in the TLS 1.3 record is the sequence number located? [closed]

The sequence number should be a 64 bit number in every TLS record, but the record header layer is only 5 bytes long and I am looking at a Wireshark pcap, where the TLS record only includes the header ...
miran80's user avatar
  • 101
2 votes
0 answers
32 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
  • 121
1 vote
1 answer
37 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
93 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
  • 113
0 votes
0 answers
1k 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
  • 113
0 votes
0 answers
34 views

TLS decryption with wireshark

I know there are many similar articles about how to do this, but I cant seem to get any of them to work, and I cant get any info to tell me what the problem might be. I am following this: https://www....
Alan's user avatar
  • 101
0 votes
1 answer
70 views

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
  • 131
0 votes
0 answers
146 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
  • 13
0 votes
1 answer
40 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
33 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
0 votes
0 answers
155 views

(Wireshark) how to filter TCP connections

I have a filter, where I am filtering connections based on a HTTP proxy hostname. But I need to filter the whole TCP connections where at least one packet contain this tag (from SYN to FIN, not just ...
user3809807's user avatar
0 votes
2 answers
217 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
  • 103
1 vote
1 answer
323 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
0 votes
1 answer
119 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
179 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
1 vote
1 answer
839 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
  • 13
2 votes
2 answers
85 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 ...
Danny Blozrov's user avatar
0 votes
1 answer
206 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
0 votes
2 answers
135 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
  • 101
0 votes
1 answer
51 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
0 votes
0 answers
10 views

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
0 votes
1 answer
50 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
0 votes
1 answer
94 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
  • 3
0 votes
1 answer
290 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
193 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
  • 171
0 votes
1 answer
74 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
0 votes
0 answers
14 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
  • 1
1 vote
1 answer
43 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
113 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, ...
claudio's user avatar
0 votes
2 answers
161 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 ...
claudio's user avatar
0 votes
1 answer
102 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
476 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
402 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
  • 11
0 votes
0 answers
87 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
  • 161
1 vote
1 answer
2k 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
490 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
15k 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
608 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
  • 23
0 votes
1 answer
68 views

When I send the ICMP packet with 4000B, but the IPv4 segment calculated 4008B

When I send the ICMP packet with data size as 4000B for testing the IP fragment. ping 192.168.2.1 -c1 -s4000 and the Wireshark captured it, Whether is is because of ICMP header? but we know ICMP ...
244boy's user avatar
  • 1,747
0 votes
2 answers
2k views

What's the Destination unreachable ICMP packet(ICMP payload the UDP) usage? [closed]

In my Mac(192.168.2.228), it will send ICMP packet to my house's router (192.168.2.1). with the info Destination unreachable (Port unreachable) and in the Wireshark packet detail panel, there ...
244boy's user avatar
  • 1,747
3 votes
2 answers
5k views

What is the difference between tshark, dumpcap and others for collecting/sniffing traffic?

Wireshark provides tshark and dumpcap, and I've also seen people using the wireshark binary or even tcpdump to collect/save network traffic. Online it is claimed that tshark or dumpcap hardly make a ...
rugk's user avatar
  • 133
1 vote
1 answer
620 views

Why the different colours for SACK markers in Wireshark's tcptrace graph?

Wireshark's tcptrace time sequence graph shows a good deal of information, but I cannot find a document that spells out exactly what it all means. It's broadly similar to the original tcptrace except ...
Dave Turner's user avatar
0 votes
1 answer
427 views

What type of attack could this be ? (Wireshark pcap) [closed]

If I understand it correctly the "client" sent an unencrypted password to the pop3 server consisting of a long string of As. Is this a type of attack and if yes, how does it work?
siheder's user avatar
0 votes
1 answer
746 views

how to send a number of TCP packets and capture only those packets using tshark?

I'm using iperf3 to send 1005 TCP packets with the commands: iperf3 -s -i 1 -f m -p 5200 -D iperf3 -c 10.60.0.113 -k 1005 -bitrate 0 --reverse --omit 2 -p 5200 In server, client respectively. The ...
Natiya's user avatar
  • 121
1 vote
1 answer
463 views

Capturing dot1q packets with Wireshark on a PC

I have spent the last few hours trying to capture some trunk packets so I can see and examine the dot1q VLAN field. I have tried mirroring the trunk port to my PC using the following commands on Cisco ...
Darth_Hamster's user avatar
1 vote
1 answer
210 views

How do I interpret this Wireshark log file?

I'm new to using Wireshark and I'd like some help with analyzing the log shown in the image. I also ran a nmap scan of the ports on my computer, but I'm not able to identify which of these lines are ...
bones's user avatar
  • 11
0 votes
1 answer
37 views

re transmission happened before receiving Three ACKs packets

In the following wireshark trace, the packet with seq=41030 was sent, after some time the packet before it got acknowledged. after that a retransmission happened the packet seq=41030, then 3 ACKs ...
0xDEADC0DE's user avatar
0 votes
1 answer
1k views

How do I use the wireshark I/O graph to plot the value of an arbitrary bit in the data layer?

I have a number of UDP packets that are using a protocol that is not implemented in wireshark. I would like to use the I/O graph to plot the value of the data packet byte at index 3. Is this possible? ...
Adam Fontana's user avatar
1 vote
1 answer
4k views

what's the difference between trailer and padding field in ethernet frame captured by wireshark?

The Ethernet minimum length should be 64 Bytes, so when the data is less than 46B, there would be some extra bytes padding to the end of data, make sure the frame size up to 64B. When I capture the ...
Ben's user avatar
  • 13

1
2 3 4 5 6