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Does anybody know how can I find out what's the interface a packet arrived on? I captured packets with tcpdump using "-i any" and now I want to find out on what interface a certain packet was received.
And another question, can I start tcpdump on an interface that does not exist yet? The code I am testing creates an interface and starts sending packets imediately. The problem is that by the time I get to hit tcpdump, some packets are already sent.
Thanks!
I think we cannot do that on a interface which is not in network .. we can work on packets which flies in the network so the Ethernet should be in network
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I've collected an array of packets on Wireshark and i'm wondering how do I filter that properly to see the most used ports / protocols?
I'd assume it'd be within "Analyze" "Filters" and then you'd have to create a specific one if this is the way of doing it, although I am unsure of how to properly express that in code.
I'd assume I dont need to provide any images of data for this query but if I should, please let me know
Any ideas?
How can I find out the traffic flow rates of my packets in Wireshark?
you can go to "statistics" then "ipv4" or "ipv6" depending of your network, then "destinations and ports".
It will give you the most used port and protocol.
Then you can just apply a filter by entering something like tcp.port == the_port in the searchbar (you have to replace tcp by the most used protocol and the_port by the port that you want to filter).
concerning the flow rate, you can find it with the flow graph. (again in statistics menu).
Have a nice day
JC
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I am trying to make 2 motes connect via a border-router, using the contiki 3 examples. I compiled er-example-client but it does not fit on my Crossbow TelosB mote. It comes up with error message:
er-example-server.sky section '.text' will not fit in region 'rom'
I am using Instant Contiki, which has msp430-gcc v4.7. The same seems to happen in Cooja as well, using Sky motes.
The application doesn't fit the Sky/TelosB ROM. Using the msp430-4.7.x provides a nice size reduction, but doesn't seem to benefit the Sky. Try disabling some of the resources enabled by default, for example compiling only with the hello test yields:
msp430-size er-example-server.sky
text data bss dec hex filename
48669 278 8646 57593 e0f9 er-example-server.sky
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Connection to internet is allowed for only one specified device (always the same one laptop). I made the factory reset, after that the problem still exists. The other devices (Android, Symbian, another laptop) can connect to Wifi, but cannot connect to internet. Two weeks ago there wasn't any problem with the devices mentioned above.
Thanks a lot:
Daniel
This doesn't seem to be a question related to programming/development. I think Server Fault would be a better place for this question.
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Hello currently im using UDP Messages to communicate my program (Made with Delphi Using IdUDPClient and IdUDPServer) on diferent computers in LAN, but yesterday i had a strange issue, one of the computers was unable to receive messages neither could other computers read his messages, All of the programs use the same UDP Port.
The only solution that worked was Restarting the router, but maybe there is an explication on why that happened?
Thank you.
I guess thats just how UDP works :) Quote from wikipedia:
UDP uses a simple transmission model with a minimum of protocol mechanism. It has no handshaking dialogues, and thus exposes any unreliability of the underlying network protocol to the user's program. As this is normally IP over unreliable media, there is no guarantee of delivery, ordering or duplicate protection.
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For example, how does Windows know that a device on the network is a wireless printer? What are the standards being used?
Are there generic protocols an application can use to submit print jobs to a such a printer if there is no available printer driver?
Internet Printing Protocol - http://en.wikipedia.org/wiki/Internet_Printing_Protocol
HP ePrint and Apple AirPrint appear to be protocols for driverless printing but I'm not fully clear on these.