Wireshark like tools can capture in coming or out going messages to our machine, is there any tool available which trace packets communication between our own machine. Like if I have client and server on same machine but port is different is it possible to trace packets?
Thanks in advance.
Windows TCP/IP stack does not implement a network loopback lo interface. See this page, for information.
You can instead use RawCap for your purpose, look it up here. You can use the command RawCap.exe 127.0.0.1 dumpfile.pcap
Select interface "lo" in wireshark , for getting the packets in the same pc.
Thanks,
Justin Jose
Related
I want to capture and analyze TCP communication data between two applications running on local host, which is running Windows 7 OS. I try to use Wireshark, but Wireshark could not capture the data, it seems just monitor the data in/out the network interface.
Could you introduce some useful tools to monitor the local TCP data easily.
The reason wireshark doesn't work is because sniffers rely on the network driver stack, and Windows don't expose localhost calls through it.
You should use Socket Sniffer, which looks at Winsock calls and monitors network sockets; the download link is at the bottom of the page.
There are limitations in Windows that prevent libpcap and Microsoft Network Monitor from sniffing localhost/loopback. But you can sniff localhost if you use Raw Sockets.
There is a free tool called RawCap that can sniff localhost and save the captured packets in a PCAP file. This allows you to inspect the traffic in Wireshark later on.
You can download RawCap from here:
http://www.netresec.com/?page=RawCap
Meet A and B, two apps running locally on my Windows box. A is listening on port [whatever], B is connecting to localhost:[whatever]
Although I can see traffic being sent by A and received by B, Wireshark (and winpcap) shows no activity on any network adapter.
What am I missing ?
Application B is connecting to the so called "loopback" interface. Here is an explanation on how to setup loopback capture in Wireshark.
I don't think you can capture local traffic with the likes of Wireshark on Windows: http://wiki.wireshark.org/CaptureSetup/Loopback
I have to test the value from client to server using different protocols (Tcp , UDP , Sctp).
Please guide how it can be possible. Is there any way in windows to change the protocol or is there anyway to find it by using software like packet tracer .
Thanks
While the question is not entirely clear, it sounds as though your interested in seeing the information sent between the client and the server when each of those protocols is used.
Windows does not provide a built in utility to view packet data but it can be viewed using a packet analyser such as Wireshark.
In order to see the values sent by each protocol you must run a client for each of the protocols and use it to connect to the server for that protocol. If you don't have a server to connect to, you may need to run one on your local machine.
You can narrow down the data captured to just the protocol you're interested in using a filter in Wireshark If you don't know the protocol being used, you can filter by the port number used for that connection which can be established using the netstat command.
You may need to use netstat -b to show you which programs are using which ports.
If you just have to generate packets using different protocols then the tool like netcat can also help. It supports TCP and UDP and has been ported to windows .
I have to make a windows based application for which captures network traffic per application where some of running application uses same port number for sending and receiving the packets.
I have used winpcap and successfully captured and filtered them port wise and destination wise but I dont know how to capture them application wise that means how to know application information from ip packets.
Is only winpcap can solve the problem or some other api's or library shoud be used.
Can we get the application information from which packet is generated from packet header?
**
Can anyone give me example that uses iphlpapi and winpcap in vc++ for capturing network traffic per application.
**
I don't think this is possible with winpcap.
Take a look at Windows Filtering Platform. It's not advanced at all.If you look in the samples you can find one which does exactly what you want.
winpcap doesn't have a good way to tell what process is sending what data.
But windows does.
try using
netstat -a -o
netstat is a program that tells you what ports are being used on your terminal.
-a switch says, "show me all the ports"
-o switch says, "show me the pid of the processes using this port"
you can't see what port your processes are sending on, but you can see what ports are receving on for udp packets.
for tcp packets you'll see all the info you could want, includeing the remote connections ip address.
I'd like to sell headless Linux servers to SOHO users. Typically, they'll have a DHCP-capable ADSL modem cum switch to which they'll connect their workstation and the server.
In order to just show up with the server, I need to find a way to just plug the server into the switch to get an IP address from the modem, and then have the server broadcast its adresse so I can then connect to it with Putty from the workstation.
I thought about using Samba to broadcast a message using the Messenger Service, but unless I'm mistaken, this only works if the two hots are configured to use the same workgroup/domain.
Do you know of way to get the server's IP address from the workstation?
Thank you for any tip.
Take a look at UPnP and zeroconf services like Apple's Bonjour.
I'd probably suggest using the normal approach for switches and modems as you are treating your device as an appliance, i.e. set a default IP 192.168.0.1, and connect to that to then configure the device into the local infrastructure.
I don't know of any good solutions.
Some DHCP servers will register the name you send in the request - then give that name in your setup instructions. But I suspect home user DSL routers aren't in that category.
Maybe you could ship a tool on CD that does arp requests to get the IP address? (Given the MAC address printed on the box)
Broadcast packets periodically on some arbitrarily chosen UDP port, and build some client software to listen for those packets.