Wireshark 3.6.9 Download
Tillie
Has anyone seen this issue and can offer help? This is the second time I have encountered this issue, with a complete OS wipe and reinstall and a change in the additional NIC between the two times. OS is Windows 7 Ultimate x64, onboard NIC is a Realtek connected to my LAN. Everything works perfectly until...
I'm setting up a dedicated monitor port to connect to my Cisco lab, using an additional NIC on the PC and installing Wireshark/winpcap. That in itself works, but I start to get a lot of network problems:
. Pages in my browser (Firefox and IE) often fail to load compeltely, or I get a page of code, a page that never stops loading or just a blank page. . Images in web pages often look garbled or truncated. . Sometimes I get browser errors such as SSL failures or page encoding errors. . FTP transfers (in any client) give corrupt or truncated files, without giving any error messages. . Problems browing fileshares on the LAN and using RDP.
The above happen so often that it's completely obvious there's a problem, and when it started. I've just done a system restore to before installing Wireshark/winpcap, and everything is back to normal.
I didn't change anything in wireshark's configuration and the only thing I did to the NIC was to disable all the services in network properties. I don't know if that's the right thing to do, but it seems to work for a quiet monitor port and I cannot see how it should cause my problems. Besides, even after reinstating all the network protocols I still had the problems, until I did the roll-back.
Earlier this evening (about two hours ago) I installed just winpcap 4.1.3 and so far have not seen the issues recur. I've tried to provoke them with lots of web browsing and ftp, but so far everything works. I have not unticked anything on the additional NIC's settings... yet.
Hmm... so far, so good. I installed Wireshark this morning, without replacing winpcap. Despite my best efforts, I've not managed to provoke the issues that I saw the last two times. Given how obvious they were, I would say that things are working this time.
I'm setting up a dedicated monitor port to connect to my Cisco lab, using an additional NIC
on the PC and installing Wireshark/winpcap. That in itself works, but I start to get
a lot of network problems:
P1: If the problems only occurs while you capture traffic, it could be related to IP forwarding being enabled on the Monitoring PC, which will then inject the monitored packets into the network again.
P2: The monitoring port on your switch could be an access port. Some switches don't disable access functionality on monitor ports. So, your PC would get a second IP address from the same subnet via DHCP with a second default route, which could cause problems (depends on the metric of the default routes). You'll see that with ipconfig /all.
Not mentioned in my OP was that I also tried reseting winsock and tcp on the PC, of course, and reinstalling the NIC drivers and even nmy browsers. The first time I had the problem I was using an Intel dual-port server NIC. I thought that might just be a driver issue (since there wasn't officially a Windows 7 driver). A clean OS resintall and new Realtek standard NIC still got the problems though.
well, then it has either to do with WinPcap, however I've never heard of such a problem, or with some security software on your PC, like Symantec Endpoint Security or similar tools (AV, IPS, VPN Client, etc.).
Agreed. I'm certain it will be something odd about my setup. The lack of any search hits on my problem say it's unlikely to be Wireshark or winpcap themselves. Actually, I've just realised I did do something different this time, other than installing them seperately...
...I uninstalled Microsoft Security Essentials after I did the roll-back, simply becase I was going to install something better and was killing two birds with one new system restore point. I never even thought that might make any difference.
Buttons are per profile. Is appdata/wireshark/dbutton_filters the Default profile and is that the current profile in Wireshark?
On Windows 10, there is an extra level in the directory: AppData\Roaming\Wireshark
Do create one from the GUI. Then see what the resulting file looks like. In particular file ownership and stuff like that.My laptop is pain this way as Wireshark will barf a lot and fail to load the files if I just replace them. If wireshark creates them they have rather different access rights and ownership.
My wireshark does not recognize my udp packets as osc packets. When I select an osc packet and want to set "Decode as", I can only select for tcp ports that it should decode the packets over the specific port (say 57120) as osc. For upd packets (and this is sent by Tidal), I can't choose to decode it as osc packets.
This adds a wireshark group. Anybody in that group will be able to sniff without being root. This is obviously more secure than just letting anybody sniff but does mean there's no password checking. Technically any person with access to a computer logged in with a wireshark account will be able to sniff. If that's acceptable to you, carry on.
Note that there are security concerns with running Wireshark in this mode, namely that any exploit that compromises Wireshark now has root privileges rather than user privileges. This is more of a concern with Wireshark than other application because, by it's very nature (capturing and processing arbitrary input), Wireshark is more vulnerable to exploits than typical desktop applications. You are probably safe on a SOHO network, but you should be aware of this concern before proceeding.
How does the Splunk monitor a Wireshark capture file in its textual form in windows 7? I converted the wireshark pcap file to the txt file. Based on what i read from the Splunk answers forum : -base.splunk.com/answers/2922/splunk-monitoring-a-wireshark-file , jerrad installed the Splunk Light Forwarder and have it monitor the textual file from the /tshark/splunk/gtp/ directory.
So that means i can set up a Splunk light forwarder using Splunk web right? I followed the instructions from the which teaches how to set up the light heavy forwarders. The instruction states a heavy forwarder has to be set up before setting up a light forwarder, which im not sure of cos i clicked add new against the configure forwarding section, which i have entered the host and port no and saved the settings.
However, i'm quite new to Splunk and now im using Splunk 4.3. When i was about to go to the manager in the Splunk Web to set up the forwarder, the instruction in the forwarding and recieving section in manager states that CAUTION: This will immediately turn off Splunk Web if the light forwarder in the Splunk web. So i would like to know if the light forwarder is the one that monitors the converted wireshark captured file as txt file since Splunk 4.3 ?
Personally I would still say TCPDUMP. Have a look at; -base.splunk.com/apps/22283/splunk-visualizations it has TCPDUMP configured as an input which should give you a head start. If you want to look at DoS attacks you might be better getting a dedicated solution for DoS and feed logs from that into Splunk. Packet capture on Splunk consumes ALOT of a license. Sadly at the moment Splunks licensing model isn't geared up for things quite like this. You can also quite easily block the indexQueue
What does your Splunk architecture consist of? - i.e. is it single installation running on one PC (e.g. your laptop or PC), or is Splunk running in a networked server and you are trying to collect data from a remote PC/laptop that runs Windows 7?
If you are running the Splunk server on your local PC/laptop AND the wireshark file is on the same physical machine, you will not need a forwarder (I think this may be were your confusion is) - A forwarder is used to collect data from a remote machine (i.e. if the wireshark file is on ANOTHER PC/laptop).
If the wireshark file is on another machine you will need to install Splunk there as a forwarder. In which case, once you have set up the remote instance of Splunk you will probably not need to use the GUI, so it may be beneficial (for system resources (i.e. CPU, memory, etc), to disable the interface.
Is this the question you are referring to? : I had a sample Wireshark capture data file as txt file that contains an Ocurrence of SYN Flood. I would like Splunk to monitor that file only without any real time monitoring for a time being then i will switch to real time monitoring. The capture file as well as the Splunk is located in the same local PC.
So even if i use wireshark which you claim isn't the best tool, it is still possible to monitor its capture files but not a good tool thats all. I just want to be able to monitor wiresharks capture files as txt files using Splunk that all for time being and now.
I would strongly suggest that monitoring a file like this would not be a very good solution to detecting DoS. If you really wanted to try and monitor for DoS with Splunk you would be marginally better off using TCPDUMP as a scripted input and do the monitoring in realtime, however have you done a test yet to analyse how much memory packet data can consume? Alot. Finally I Would also suggest that a DoS is unlikely to show as an anomaly, it would more likely manifest itself as a normal connection that you would expect but happening by an order of magnitude.
That means i would have to specify what i would like monitor. In this case, i would like to detect log anomalies such as the occurence of Denial of Service attacks. So what do i do so that i can monitor the wireshark text file the way i want?
i.e. the correct timestamp recognition is in place, and line breaking is taking place correctly. It is easier to make changes to timestamp recognition/line breaking here, as Splunk will assist in the setup (and even show you what changes are being made to the props.conf file).
If this answers your question, can you mark the answer as accpeted (the tick next to my answer), as this will show others the question does not require more attention, and helps those looking for answers.
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