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

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5
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4answers
2k 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
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0answers
61 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
285 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
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0answers
85 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
27k 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
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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
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1answer
125 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
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2answers
95 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 ...
0
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0answers
170 views

Exporting SNMP OID values from wireshark capture?

I am trying to figure out how I can export the SNMP OID values that wireshark picked up. My issue is that when I export the raw data it is all together and not seperated. All I want to to is get only ...
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
107 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 ...
2
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0answers
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. ...
1
vote
2answers
186 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
118 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
120 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 ? ...
2
votes
3answers
13k 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
512 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
307 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
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2answers
94 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
226 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
206 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
3k 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
622 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
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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
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1answer
108 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
162 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 ...
1
vote
1answer
187 views

“tshark: There are no interfaces on which a capture can be done” in Amazon Linux AMI

My goal is to capture packets with tshark in Amazon Linux AMI. While typing tshark in the command line there's an error: "tshark: There are no interfaces on which a capture can be done" How to ...
1
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0answers
111 views

NFSv3 Asynchronous Write Depends on Block Size?

I am trying to figure out if my NFSv3 deployment is performing SAFE asynchronous writes. I suspect that it is doing strictly synchronous writes, as I am getting poor performance in general. I used ...
1
vote
1answer
139 views

How can I measure the cumulative network usage of a process, from execution beginning to end

I want to measure how much bandwidth git pull uses, preferably by prefixing git command with desired program, i.e. nettally git pull Alternatively, is there some sneaky way to accumulate nethogs / ...
0
votes
1answer
3k views

Why Wireshark does not recognize this HTTP response?

I have a trivial CGI script that outputs simple text content. It's written in Perl and using CGI module and it specifies only the most basic headers: print $q->header( -type ...
14
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2answers
28k views
2
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2answers
1k views

Wireshark filtering-trying to filter out my own local ip

i'm trying to filter out my ip address(local address) "192.168.5.22" I used "ip.src != 192.168.5.22|| ip.dst !=192.168.5.22"(without quotes) and I keep seeing my address pop up im in a heavy traffic ...
2
votes
4answers
876 views

Extremely high arp fllooding from the router

My subnet is 10.162.0.0/16. We have a router with a couple of interfaces. Gateway for my subnet is 10.162.0.1. The router is situated in another building and I haven't direct access to it. Line from ...
0
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0answers
660 views

Window Size goes to zero

We are seeing an issue with our web servers where a client is doing a HTTP POST and sending xml files. We are seeing weird behavior where we are sometimes only receiving part of the data. (Sometimes ...
15
votes
4answers
6k views

Change protocol associated with port in wireshark

I'm trying to monitor some web traffic using wireshark. Our web proxy is on port 9191. How can I get the wireshark view to treat port 9191 just like port 80 - ie as HTTP. Just using Decode_As on the ...
1
vote
1answer
87 views

Wireshark not found after installing RHEL 5.5 [closed]

After installing Wireshark in RHEL 5.5 (32bit) with following command: yum install wireshark Wireshark not found: [root@localhost ~]# wireshark bash: wireshark: command not found What ...
0
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1answer
84 views

tshark duration of a conversation for a ip address

i can retrieve the follow info from a .pcap : ================================================================================ IPv4 Conversations Filter:ip.addr==1xx.1xx.0.1xx ...
0
votes
1answer
142 views

Wireshark - Difference between fixed parameters and tagged parameters

I'm new to Wireshark. I'd like to know what are fixed and tagged parameters and the difference between them. Web search didn't help. Kindly explain it to me in simple terms.
0
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0answers
181 views

Apache logs or tcpdump slow loris

i know about the question : How can I detect Slowloris? but that does not apply. Now i have a big server that receives more then 10.000 events on the IDS per each 10 minutes, and i have suffered in ...
1
vote
1answer
229 views

mysql logging activity from specific user or ip

I have mysql server. The server is accessed by my application, and by external auditor (person using mysql workbench). The auditor has specific user and password and dedicated IP and it is granted ...
4
votes
2answers
6k views

How to debug “HTTP request sent, awaiting response”?

I have a Linux server on an ADSL connection, and I just noticed that sometimes I get Connecting to example.com|xxx.xxx.xxx.122|:80... connected. HTTP request sent, awaiting response... when I use ...
1
vote
1answer
626 views

trace ftp file data in wireshark

I am trying to analyze ftp traffic in Wireshark. I can see commands like Request: List, PORT. But after FTP Response 150: Opening data channel for directory list. what I see immediately is ...
-1
votes
1answer
293 views

Incoming Outgoing Packets Wireshark

Is there a way to have a column or a filter that marks each packet as incoming (download) or outgoing (upload) in Wireshark? I guess this should be relative to the selected capture interface device.
0
votes
1answer
261 views

Source and Destination Packets on Wireshark Relative or Absolute?

New in Packet Analysis. Sniffing on the Ethernet device of my computer. Does the Source and Destination columns on Wireshark tell the source and destination from where the packet was originated and ...
1
vote
1answer
735 views

How to parse OpenFlow packets using tcpdump capture file programmatically

I am working with OpenFlow packets and am analyzing the network via tcpdump. Currently, I use the WireShark GUI to parse the generated capture file and it does serve my need. However, I was ...
2
votes
3answers
798 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 ...
5
votes
1answer
13k views

Why does WireShark think this frame is a TCP segment of a reassembled PDU

Please find a small pcap file here illustrating my problem. I have a three-way TCP handshake, followed by two FIX logons. (FIX is a protocol used in trading.) The first FIX logon (frame 4) is ...
4
votes
3answers
3k views

Wireshark running on a server seeing lots of `ARP who has` with different tells

We're seeing some suspicious network activity, and when I was trying to see if it was one particular server of ours I ran a Wireshark trace. I noted a lot of ARP packets asking who has x.x.x.x, but ...
5
votes
3answers
11k views

How do I install Wireshark in Red Hat Linux?

How do I install Wireshark in Red Hat Linux? At the Wireshark download page, am I supposed to download "Standard package" for Red Hat under "Third-Party Package"? Does the Red Hat version have a ...
0
votes
1answer
1k views

Why am I seeing so many MAPI “Unknown?!” request/response in a packet capture?

We are experiencing user reported slowness with our Exchange 2007 server. We thought it was associated with a new application that we're testing. (This application uses MAPI to look at all of the ...