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

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2
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1answer
2k views

tcpdump not picking up traffic redirected by iptables

The following iptables rule is used to redirect all internet traffic coming in from eth1 to port 3000 at localhost (interface lo with ip 127.0.0.1): iptables -t nat -A PREROUTING -i eth1 -p tcp ...
-1
votes
1answer
64 views

Analyzing twitter packets [closed]

Thanks for your time. I'd like to find a way if a client has made a 'GET' or a 'POST' request for twitter. We are currently doing an educational project and we wanted to understand how we can achieve ...
1
vote
1answer
273 views

How can I write a filter to get tcp sequence number inconsistency?

I am using WireShark 1.12 and I am trying to filter SYN , SYN/ACK , ACK by inconsistencies. Would anyone know how to write a filter for this version? Currently I am using this: tcp.ack & tcp.seq ...
9
votes
5answers
17k views

How can I sniff the traffic of remote machine with wireshark?

I can sniff the traffic of my local pc but I would like to know how to I sniff the traffic of a remote machine by wireshark? When in capture option I select remote interface and enter my remote ip ...
-3
votes
1answer
126 views

How do I get statistics on HTTP traffic from Wireshark? [closed]

I have captured traffic with dumpcap and filtered http only with Wireshark. I want to see statistics about that http traffic. For example: requests grouped by method and URL, ordered by number of ...
1
vote
1answer
368 views

Can firewall block packets visible in Wireshark?

Wireshark shows that an RTP package is received on a PC. Is it possible that despite detection by Wireshark, something (firewall?) is still prevent the application listening to the required port on ...
0
votes
1answer
5k views

Convert .txt file to .cap to open it by Wireshark

I have packet in a text file how I can convert it to .cap file? I need to analyze this packet by Wireshark. Thanks
0
votes
0answers
87 views

Why am I getting ICMP traffic with wireshark DNS filter?

I am surfing the web and looking at dns traffic in wireshark with the "dns" filter active. When I ask for a non existant domain or subdomain I get a Destination Unreachable (Port Unreachable message). ...
3
votes
2answers
729 views

Why is Wireshark not capturing certain POST requests?

If I use this filter in Wireshark: http.request.method == "POST" and use the vote buttons to vote for a stack exchange question, then Wireshark captures the corresponding POST request. I can also see ...
3
votes
0answers
136 views

RTP analysis - Discerning ptime (packetization time) for a given VoIP packet capture

I would like some help on the subject of an automated way of discerning the average packetization time (ptime) of a VoIP call's packet capture. The reason I am not depending on the value in the SDP ...
0
votes
1answer
34 views

Is it possible to mimic the client of a https web service

There is such a windows application that communications with the server through https protocol, it is an auction tool and works only several hours per month. I have captured network packets (by ...
0
votes
1answer
22 views

Why am I seeing prefixed/duplicated packets coming from a comcast device?

I'm looking at traffic my CPE from Comcast in Wireshark, and for every packet, there is an additional packet that is the exact same, except for 4 additional bytes at the beginning of the frame ...
0
votes
0answers
68 views

wireshark not showing netflow source addresses nfdump does

Hi guys i'm experiencing following issue, hope someone can explain me what's happening. I got a pcap with a dump of udp packets containing netflow data. I've used tcprewrite and tcpreplay to ...
0
votes
1answer
22 views

See historical packet receipt statistics in Windows

I know this is a long shot, but it would be really useful to me right now. Does anyone know of a Windows function or 3rd party tool that can show stats about the receipt of packets on a network ...
1
vote
0answers
142 views

Can I use tshark to write SSL-decrypted packets to a file?

I have a PCAP file containing SSL-encrypted HTTP traffic and the private key from the relevant web server. I'd like a PCAP file that contains the decrypted HTTP traffic to feed into a different tool. ...
0
votes
1answer
301 views

SIP INVITE packet has WAN address rather than call manager LAN IP

I am using SIP between two subnets (192.168.3.0/24 and 192.168.30.0/24) each connected via VPN. I have a call server on 192.168.3.100, and two phones 192.168.30.118 (Ext. 3128) and 192.168.30.119 ...
2
votes
1answer
114 views

Intermittent switch failure and data flooding, hardware capacity?

We are using a switch (ZIO-SW500) connected to the building main network and we suffers from intermittent network halt. Normally the network works well. But, sometimes traffic designated to other ...
13
votes
3answers
27k views

How can I filter https when monitoring traffic with Wireshark?

I want to observe the HTTPs protocol. How can I use a Wireshark filter to do that?
1
vote
2answers
1k views

TCPDump and IPTables DROP by string

by using tcpdump -nlASX -s 0 -vvv port 80 I get something like: 14:58:55.121160 IP (tos 0x0, ttl 64, id 49764, offset 0, flags [DF], proto TCP (6), length 1480) 206.72.206.58.http > ...
-5
votes
1answer
289 views

how to sniff from a remote machine? [closed]

I have a PC and a tablet that connected to a TP-Link ADSL modem. PROBLEM: I want to see the packets that send and receive from my modem not my PC( to see both wire and wireless packets) I search ...
1
vote
2answers
4k views

Wireshark TCP Window Size Value

I am debugging an application with Wireshark and watching the TCP Window Size value shrink on one side of the communication. If the packet's TCP section shows a "Window size value: 1", does that mean ...
0
votes
0answers
140 views

Wireshark - view complete packet

I am trying to use Wireshark to capture some HTTP packets, but when the packet is too long, Wireshark truncates it in its window. The bottom window still shows the entire packet, but I am not able to ...
6
votes
2answers
8k views

No interface available for Wireshark running on Ubuntu with wireless connection

I'm completely new to wireshark. I have Ubuntu on a Dell with wireless connection. When I go to Wireshark Capture Option, I cannot select any interface since no interface is listed. What is the ...
2
votes
2answers
513 views

Network flooded with seemingly empty packets

Let me preface this with the fact that I'm just a web developer at my company with little networking knowledge. Earlier today there was a department that lost all of their network connections so I ...
2
votes
2answers
363 views

Packets returning but traceroute fails

I get this output from traceroute: #traceroute -i eth1 -s 192.168.12.14 192.168.1.72 1 192.168.12.1 (192.168.12.1) 1.410 ms 2.076 ms 2.251 ms 2 * * * 3 * * * etc.. But in another terminal I ...
-1
votes
2answers
494 views

block all packets in windows 7 (so nothing appears in wireshark)? Can anything locally installed do it?

is it possible to block all packets in windows 7, so that nothing appears in wireshark? I have tried choosing Block all for incoming. for outgoing, I see it has no block all option, just a block ...
5
votes
4answers
3k views

Capturing multicast data with Wireshark with IGMP Snooping Enabled at the switch

I am trying to capture multicast traffic via Wireshark (actually TShark), however the switch has IGMP snooping enabled and will only send Multicast traffic on the ports that have an active IGMP ...
0
votes
0answers
89 views

ZyXel ES-2024 - Mirrored port showing duplicated traffic

I have a ZyXel ES-2024 PWD switch. I would like a computer plugged into port 26 to see all traffic that passes through port 2, both inbound and outbound. I have configured port mirroring for the ...
3
votes
1answer
443 views

Need help understanding capturing from Wireshark?

I am having issues with my FTP servers. Connecting, sending and receiving fail sometimes, and it is not consistent. I manage to capture and filter by IP the packets, I just need pointers on what can ...
2
votes
0answers
109 views

replay decrypted ssl traffic with tcpreplay

I have an pcap format from some https traffic from one of my web-servers. So I can use the key from my webserver to decrypt the traffic in wireshark. The problem I'm now facing is that I can't get an ...
8
votes
4answers
30k views

How do i convert wireshark capture files to text files?

How can I convert wirshark captures (.cap) files to text files or some format from which I can read the file and parse its contents ? Regards, Mithun
1
vote
1answer
2k views

Understand wireshark capture for ssh key exchange

I need to understand SSH key exchange, I have tried to read RFC document but it seems very difficult to understand so I have captured packets using wireshark ,I found various packets for ssh ...
0
votes
1answer
173 views

Wireshark seems to ignore my filters

I'm trying to make use of Wireshark 1.10.6 for Windows and I want to only capture the traffic to port 443 (to diagnose some weird HTTPS problems I'm having). So I open Capture -> Capture Filters... ...
2
votes
2answers
114 views

EC2 hosting, trying to understand network security model

We are hosting few virtual machines at amazon. Security groups and other configurations are set up to allow access only from desired addresses and to desired parties. The machines do talk with each ...
30
votes
3answers
2k views

ISP broadcasting all IP-packets, so I can see traffic of other clients from ISP

Recently I wondered why my router shows a constant downstream of 5 MBit/s, while I am downloading almost no data. I discovered the "packet logging" function of my router, with which I was able to log ...
2
votes
2answers
119 views

How can I get a list of the ports that Wireshark knows?

When I need to choose a new port to use (internal to an organisation) I used to look in /etc/services. This is no longer sufficient, as Wireshark knows about many other ports that are not in ...
1
vote
2answers
274 views

Can I capture ISP SNMP information with Wireshark?

I am trying to do some heavy digging into SNMP, BPI+, ISP networks. Since wireshark can be used to capture network data, would I be able to use it to remotely capture my ISP SNMP agent information and ...
0
votes
1answer
134 views

Linux unfriendly IIS/ASP.NET :-) : Quick download on windows but slow on linux [closed]

This particular web site (gops.tay.be) serves objects quick if I try to request the page using windows, but I get them very slow if trying using linux. There is no difference if I use browser or curl: ...
0
votes
2answers
144 views

Caculating packet offset

In Wireshark, if I want to write a filter which accepts only ICMP destination unreachable ( type 3 ) messages, the filter is icmp[0] == 3 . How do I count the packet offset of 0 in this instance ? ...
3
votes
3answers
17k views

Excessive 'TCP Dup ACK' & 'TCP Fast Retransmission' causing issues on network. What's causing this?

I'm getting excessive TCP Dup ACK and TCP Fast Retransmission on our network when I transfer files over the MetroEthernet link. The two sites are connected by one sonicwall router, so the sites are ...
0
votes
2answers
702 views

How can I create a packet capture file on a headless server for a single process?

I'm writing a python script on a headless server, and I'd like to see the packet capture output for the script. I can't run ettercap or Wireshark on the server as there is too much other noise ...
2
votes
1answer
351 views

Strange Ethernet II packets in wireshark

Looking at a wireshark capture, I'm seeing something really strange. Ethernet II packets with random data are being sent on the network. The larger packets in the capture seem to contain bits and ...
0
votes
2answers
100 views

Occasional Delay on Website Resources: Packet Loss Due to Bandwidth Cap?

My website loads more slowly than I think it should, due to a few of the assets taking an absurdly long time to download from the server. I've been trying to track down the cause of this. I'm about ...
0
votes
2answers
268 views

server sending hpoms-dps-lstn packets to unknown IP

I have a server running pacemaker with corosync and some standard services as mails, web, ssh... When I run wireshard in my network I keep getting those packets that my server is sending to the IP ...
-6
votes
1answer
276 views

How to monitor all network traffic [closed]

I have installled wireshark on my server but can only monitor traffic through the local nic but all network traffic does not go through the server. I would like to monitor all network traffic. Are ...
2
votes
1answer
4k views

tcpdump capturing tcp resets by host

I am trying to figure out where my tcp resets on my webserver happen. I have the following capture: tcpdump -fnni bond0:-nnvvS -w dump.pcap 'tcp[tcpflags] & (tcp-rst) !=0' When I look at the ...
0
votes
1answer
898 views

Wireshark - Capture syslog traffic form local workstation

I am using wireshark version 1.10.3 on windows 7 x64 enterprise. I am trying to capture all outbound UDP traffic, in particular syslog traffic. I have tried a capture filter UDP, but all I can see ...
1
vote
3answers
3k views

Can Wireshark capture an entire Ethernet frame including preamble, CRC and Interframe spacing?

I am examining an Ethernet frame in Wireshark. According to the "Ethernet frame" Wikipedia article and accompanying diagrams, "A frame starts with a 7-octet preamble and 1-octet start frame delimiter ...
0
votes
1answer
122 views

Network card capable of capturing a tonne of packets and not dropping them?

Edit: Our server is trying to capture packets at between 500-600Mb/s, but is dropping packets 'due to kernel'. Data is being written to SSDs, and isn't bottleneck there. What things should I look ...
2
votes
1answer
188 views

How to block own rpcap traffic where tshark is running?

Platform :- Fedora 13 32-bit machine RemoteMachine$ ./rpcapd -n ClientMachine$ tshark -w "filename" -i "any interface name" As soon as capture starts without any capture filter, thousands of ...