Wireshark is a open source Network Protocol Analyzer under GNU License.

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How to decode traffic as NTLM protocol in Wireshark?

I'm trying to debug NTLM authentication issue. One of my ideas was to capture the network traffic and look thougth it. In my case NTLM authentication is going over non-stardart port (6901). Of course, ...
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1answer
60 views

Too Many HTTP Requests from one source

We are having an issue at one of our customer sites where Tripwire is flagging events when more than 1000 HTTP connections are being individually created from different IP addresses within a span of ...
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36 views

Domain PC freezes, the NIC blocks all L3 connectivity on that switch

I manage a domain with 80 PC and for over a year I have a big unsolved problem. I redistribute windows update using a WSUS on domain. The PCs after the user finish working and leave, start installing ...
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9 views

How to find ACK for multiple segments using Wireshark?

I'm trying to use Wireshark to find a ACK (for TCP connections) send my the server which ACKs multiple segments as opposed to just ACKing 1 segment. Is there a wireshark filter than can help me with ...
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0answers
27 views

Wireshark only capturing broadcast packages [closed]

I've ran Wireshark multiple times on my notebook for wireless networks verifying mobile packages for my devices and it used to work most of the time. I haven't been able to monitor my traffic today ...
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2answers
1k views

IP Conflicts from mikrotik router for multiple ip addresses (that it isnt assigned)

I have a point to point wireless connection using two mikrotiks. When I plug the mikrotik into a switch with just my laptop I get an IP address conflict on my machine no matter what IP I am assigned. ...
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2answers
48 views

How can the SSDP protocol be filtered out of Wireshark view?

In Wireshark version 1.12.4, I am trying to filter out packet messages with an SSDP protocol. When I clicked the Expression button next to the Filter field, and selected "HTTP" (as Field Name) and ...
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29 views

Remote packet capturing using fifo and dumpcap

I'm currently working on two linux servers where one server is running in 2.6.18-274.el5(Server A) and the second one in CentOS 7 (Server B). My requirement is to capture the packets of the network ...
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1answer
34 views

How to ping a host with different MTU size to simulate icmpv6 packet too big scenario?

As the Title states,I want to check whether my host will actually send a ICMPv6 packet too big if i send a packet with beyond the defined MTU size.I don't have a cisco router(extended ping) to try out ...
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21 views

Wiresharking access to AWS to debug permission problems

I have a plugin which pushes files to S3. It's not my plugin and auditing what exactly it does has proved difficult. I'm trying to enable access logging on the bucket to figure out what exactly is ...
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47 views

Unknown device showing up in network scan

I need some help finding a device that has been showing up whenever I scan my network using Spiceworks' "Inventory" scan. I can ping the device, but nslookup returns a non-existent domain, and ...
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3answers
1k views

While analyzing a network interface using WireShark, which device's timestamp is recorded?

OK, this may seem trivial but due to the nature of testing required for my application, I need to get precise timestamps. I am using WireShark to analyze packets. Suppose I have a network with 2 ...
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0answers
72 views

Creating a Network Diagram with .pcap [closed]

I have a Wireshark .pcap Capture of around 500k packets and I would like to enumerate a Network Diagram with all the Routers, Switches, PCs etc. Is there a tool that I could use to automatically ...
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60 views

Expanding HAProxy health check to monitor MongoDB primary and secondary state

Follow up question regarding the MongoDB health check with HAProxy How to construct a MongoDB Health Check in HAProxy? The current solution works well when the focus is on determining if mongo ...
6
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2answers
158 views

TCP acks are paused, then resumed, then paused again. Why?

I would like some help finding the reason for the reduced data transfer rate in my application. I have 12 embedded systems and a Linux server. The embedded systems send data to the server over TCP on ...
2
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0answers
39 views

Difference between ping time and time for first ACK answer

While creating a packet performance monitor I come across the follow problem: if I ping a server, I get about 4ms. If I calculate the time between a POST and its first ACK, I get about 25us ...
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1answer
417 views

Catalyst 3560G SPAN session not mirroring IGMP packets

I am developing a device which acts as a multicast host, and want to observe it as it responds to IGMP Queries. My Catalyst 3560G is set up as follows (full config below): Port 0/1 is a TFTP server ...
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1answer
486 views

wireshark extract w3c log file

Does anyone know how I would go about extracting urls in w3c extended log format from a wireshark pcap capture file?
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2answers
79 views

In WireShark, how can I filter results so that it shows only a single line per source?

I'm using WireShark to find any systems pointed to an old system we're decommissioning and rather than showing the same IP 1,000 times I'd like to use a filter that will only show each IP source once. ...
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1answer
47 views

Wireshark does not capture second IP address traffic

I have interface with ip address: 192.168.1.3. I'm adding a second ip address: 192.168.1.4 to that interface using: ip address add Then from other computer (192.168.1.10), I ping those address & ...
10
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3answers
10k views

Stopping the WinPcap Packet capture service

I just installed WireShark, which also installed WinPcap. During the installation it said "do you want xxx to start automatically", which I answered yes. Now I would like to stop the service when I ...
10
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1answer
5k views

Unable to open WireShark in CentOS 6.5

I have installed WireShark in CentOS 6.5 with the following packages using Yum. Dependencies Resolved ================================================================================ Package ...
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3answers
2k views

HTTP not finishing over LAN. Hardware cause?

On a customer server running Apache 2.2 on Windows server 2012 we're noticing that from time to time, some requests to the server never finish. Using wireshark I've found a bunch of duplicate ACKs get ...
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277 views

tcp connection reset [RST, ACK]

getting this errors looks like server is restating the connection because of some packet loss any possible suggestion's to figure out this 37713 591.925575000 ...
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1answer
30 views

Selecting a TCP stream with most bytes transferred in Wireshark

I have captured traffic in Wireshark and I want to follow the TCP stream with most bytes transferred in the traffic. After opening Statistics > Conversations and sorting by Bytes column I filter the ...
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1answer
62 views

server is not responding on SYN packets

On the attached tcp dump, the first two SYN packets (#21800 and 21801) came to the server, however SYN ACK was sent for the second SYN. Is that correct behaviour? My understanding is that the client ...
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1answer
1k views

tshark (wireshark) to pinpoint connect reset / retransmitted issue

Windows server 2003. I have the latest WireShark installed on the server and need to capture packets on the server to pinpoint a randomly happened connection reset /retransmitted issue. When the ...
6
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1answer
81 views

What is “Cisco STG” and why would it dynamically replace a wildcard certificate on port 5061?

I have a lync client that is connecting to a Lync Edge server on port 5061. I get an invalid certificate error when connecting. When I run wireshark, during the TLS setup, and inside the ...
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4answers
70k views

What causes duplicate ACK records?

We're reviewing Wireshark captures from a few client machines that are showing multiple duplicate ACK records which then triggers retransmit and out-of-sequence packets. These are shown in the ...
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0answers
56 views

Decrypt All traffic by wireshark [closed]

Ok I can decrypt a specified client connected to wifi by deauthing it and getting the handshake using wireshark. In fact after wireshark captures the EAPOL messages it starts to decrypt the traffic. ...
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1answer
928 views

TCP Zero Window with no corresponding Window Update

I am trying to debug a network issue and am using Wireshark and tcpdump to grab packets from my server. I have one client application that is grabbing all my available connections and then holding ...
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58 views

What conditions can account for incorrect inbound TCP checksums?

According to The Wireshark FAQ TCP checksum offloading causes checksums for outbound traffic to be calculated incorrectly. On some Linux hosts I see some inbound TCP traffic that is flagged with ...
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2answers
44 views

Wireshark/tshark cutting data short

We are doing a packet capture from within our testing software using the command line: tshark -V -i vlan2091 -R "bootp.hw.mac_addr contains "00:17:33:00:00:00"" The problem we have is one of the ...
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1answer
118 views

Dumpcap on remote linux interface

I want to capture packets on a remote linux interface using dumpcap. I have observed that there is a command - dumpcap -i rpcap://<host>/<interface> and dumpcap -i ...
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98 views

Installing Wireshark 1.6 on CentOS 5.7

I want to install wireshark version which is higher than 1.2 since I need to analyse the iec104 packets (only version higher than 1.2 supports this). I am using CentOS 5.7 version and it only supports ...
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1answer
59 views

Difference between ISAKMP exchanges types IKE_SA_INIT and Identity protection

I have some Wireshark traces to see how ISAKMP works. This traces were taken from peers when a IPsec tunnel is stablished. It seems that the traces display a different IPsec implementation. When IKE ...
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1answer
51 views

Plain UDP shows up as STUN in Wireshark

I am sending 4 bytes of data over UDP upon request from another program. Sometimes the frame's protocol is identified as STUN in Wireshark, but I have no clue why. A ruby prototype of the ...
22
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4answers
89k views

How to filter http traffic in Wireshark?

I suspect my server has a huge load of http requests from its clients. I want to measure the volume of http traffic. How can I do it with Wireshark? Or probably there is an alternative solution using ...
0
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1answer
219 views

user agent in http or https request

Is there any way that I can differentiate, the HTTP or HTTPS packets are coming from browser or not ? specially for https request.There is User-Agent field in packet in Http,but I could not found ...
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1answer
65 views

Why do I see so many ssh packets in only a couple seconds?

I am learning how to use tshark so I can better understand networking. As a user the protocol I most often use day to day is SSH. So I thought I'd start a capture filter on ssh packets on my server ...
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0answers
686 views

Only capture HTTP post requests through tcpdump

For security purposes we want to list all POST requests URI's that are used in our applications (so we would disable POST through mod_security except for those URI's). The idea is to use tcpdump to ...
2
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1answer
123 views

Understanding LDAP traffic with ActiveDirectory

In looking at LDAP traffic through Wireshark I was curious to understand the conversation between the a windows client and Active Directory. Each conversation would vary to less than 80k bytes. But ...
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1answer
77 views

Where to optain my client key for SSL decryption? [closed]

example.pcap is a traffic capture I have made on my local Linux box of and now I would like to decrypt it. tshark -o "ssl.desegment_ssl_records: TRUE" -o "ssl.desegment_ssl_application_data: ...
3
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5answers
7k views

Wireshark filter to only capture Incoming Packets?

I am trying to setup a Filter (so my log files aren't massive) that will capture only incoming traffic. I have looked on http://wiki.wireshark.org/CaptureFilters but so far have been unable to find a ...
3
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3answers
12k views

How can I configure Wireshark to list my dial up connection as a possible capture interface?

I am trying to monitor traffic coming into to my machine via an incoming dialup connection. I am using Wireshark with WinPCap 3.1 ( I rolled back to 3.1 from 4.0 because I read that this was the ...
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32 views

How to meet the arp table and the network toology with wireshark

I'm wondering if is possible meet(see) the arp table in a network traffic with wireshark or find some way to build manually the arp table, and how to see the router and swiches of topology( for ...
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1answer
83 views

Corrupt DNS requests

Sometimes in some network captures that include my DNS server, I find there are failed lookups for what seem like invalid requests. When viewed in Wireshark these show up with what looks like escaped ...
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41 views

upnp keep alive packet

I took a wireshark packet dump and Iam able to track the initial MSEARCH, SSDP out message to multicast IP etc., from my-device. but how do I see the incoming keep alive message from the other-device ...
2
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0answers
652 views

Troubleshooting Packet Loss on pfSense + Ubiquiti UniFi (Wireshark maybe?)

I'm dealing with an annoying situation in a small network in my church, which I'm the primary volunteer IT caretaker, of about 20 PCs, give-or-take. We're in Chattanooga, home of Gigabit internet, so ...
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6answers
4k views

How to record SIP traffic / calls for future auditing?

We have a VOIP (SIP?) phone system and have to record all calls for specific phones in the company. It may be required at a future date to listen to these calls for auditing. These phones happen to ...