Wireshark :: It Says No Packets Are Being Captured
Dec 18, 2011
Ive just downloaded wireshark just to mess around and ive noticed that even when ive got nothing open its still capturing packets. It gives me a choice of interfaces i want to choose to monitor and i would of thought it be "Realtek PCIe Family Controller" as this is normally the default one (im using wireless) but its saying no packets are being captured from this interface its the "Microsoft" Interface thats capturing the packets. Ive attached a screenshot, i know this isnt nothing bad but was just wondering 1) why isnt my Realtek PCIe interface capturing anything?
i'm planning to use wireshark in my final year project (packet sniffing in wireless networks)and i alraedy installed it and captured some packets, but i don't know how to analyze those packets.I have basic information about networking from CCNA1. I want to learn how to anaylze the captured packets and what the hexadecimal values i got with each packet represent and how to read them.
I am capturing at 2 different locations and I need to find packets that are getting dropped between the 2.
I have done all the merging and everything needed for this in wireshark but because the mac address changes 1/2 way to me all the packets are coming up as lost
is there anyway to remove the MAC address from the captures or as a field it looks at?
If I look at a site like wikipedia for example ,it has lots of text. If I capture those packets which made up that page using wireshark I cant find that text anywhere no matter what filter I use and even though I turn on ASCII. Is it because text is being rendered unreadable by some kind of compression?
Ive just downloaded wireshark just to mess around and ive noticed that even when ive got nothing open its still capturing packets. It gives me a choice of interfaces i want to choose to monitor and i would of thought it be "Realtek PCIe Family Controller" as this is normally the default one (im using wireless) but its saying no packets are being captured from this interface its the "Microsoft" Interface thats capturing the packets. Ive attached a screenshot, i know this isnt nothing bad but was just wondering 1) why isnt my Realtek PCIe interface capturing anything (even when i have youtube open it doesnt capture anything) and 2) why is Microsoft capturing packets? what is this microsoft interface and why is it capturing packets when nothing is open.
we have two 2851's. One in Australia, one in NZ, IPsec VPN between the two.
We have multiple subnets behind the tunnels. From all the sunbets in Aus we can reach all the subnets in NZ, except for one. From NZ we can reach all the subnets in Aus. The traceroute and pings from the subnet in question in Aus goes out the internet interface of the router instead of going into the tunnel.
The subnets in question are 10.110.220/24 (Aus), 10.110.250/24 (NZ)
The access lists at both ends cover the traffic required but for some reason when leaving Australia the traffic is not captured by:
In my environment we have 3750x switches running ios 15.0 (1) SE2. We have port security mac address sticky configured on all our switch ports. I noticed that we have several interfaces (on different switches) that are up but have not captured the MAC address from the workstation. Here is one example:
I'm trying to schedule a 90 second capture every 20 minutes to coincide with a process I have running. I have created a batch fun to run tshark.exe with the command to stop after 90 seconds, and an output file (-w). This all works, my challenge is that the next time it runs it overwrites the previous file. Is it possible to make tshark timestamp the filename? or is there something clever someone can recommend with a batch file to copy last version somewhere else and rename, so that I can have the process running constantly.
A network administrator wants to capture some network data. He opens Wireshark software, start capturing, and does the following:In PC-A, runs a command in command prompt. The network admin issues the command and sees there is ping response from the google.
We are going to be rolling the 4500 switches out and I wanted to know more about how to use the wireshark featue. Any documentation on how to use this?
I have cisco 2651 with one L3 interface ip 172.26.18.200. This Cisco is gateway from E1 PRI (PBX Aastra MX-ONE TSW) to SIP (Asterisk). This cisco 2651 connected to cisco 2950 in port Fa 0/12. Fa 0/12 is in VLAN 518 (dot1q).
On cisco 2950 i made next commands:
# monitor session 1 source interface Fa 0/12 both encap dot1q # monitor session 1 destination interface Fa 0/9 #sho monitor session 1 [Code].....
Recently i have upgraded the IOS of ASA5550 (in HA mode) to 8.4.2 from 8.0.5, after OS upgrade we found that the syslog from thses firewalls are not getting captured/transfered to centralised syslog server. The server is reachable from the firewalls.
I do not see 802.1Q tags nor do I see p-bits (COS) in my wireshark captures. My setup is not working and I have no way to verify (sniff) that the 6509 is setting the p-bits to 3. [code]
I use a wireless adapter to connect to our home network but its stopped receiving packets but is sending them. It has worked fine for ages now it just randomly stopped. The network works with everything else (laptops, Xbox and iPods) but my pc wont receive anything. Also our home connection has no password as we live in the middle of nowhere.
I am having a really hard time with a computer that has a wireless connection. Specifically the internet keeps going out. The computer info is that of the affected computer and not the host computer to which the router and modem are connected.
I've no experience in VoIP and been ditched with looking at an IP trunking problem on our network.The users where getting dead lines or silent calls, but it seems after re-seating IP trunking card here and there around the network a few times, all is settled to normal. Unfortunately it's a third party that look after the majority of the telephony, and as they can't figure out why this happens they often say it must be a problem with the data WAN it traverses.So I started trying to figure something out, I have IPSLA monitoring setup in Solarwinds on most of the routers and all looks well from that aspect; MOS is 4.34 and Jitter is only 1ms at worst. I've taken a wireshark packet capture of the IP trunk by mirroring the port on the switch at a main site where I've been told a lot of calls are routed through. Inside wireshark I used the 'telephony> voip calls' tool and decoded all the calls. The output is showing most calls have 'Out of Seq' and 'Wrong Timestamp' at around 25-50%. Although these calls seem fine otherwise, and I took this capture whilst the fault was not occurring. I know I need to capture next time when the fault is occurring, but this is what I have for now.How can i fix this or even start to troubleshoot further?
p.s- each site has two routers running GLBP to the WAN, over two ISP locations. I read something about having consistent routing to avoid packets arriving out of sequence, but haven't found anything yet to say this is how I can/should do that.
One Day the internet is fine the next day The Internet Stopped working. The problem is my pc is sending packets but not receiving any i though it was a bug or something so i restarted my pc after i restarted my pc the internet was working fine until a couple of minutes passed it stopped receiving packets again.i tried resetting the modem but nothing worked.I tried winsock fix or resetting TCP/IP and stuff but nothing workscause its starting to frustrate me.
Our computer is sending but not receiving packets. We've tried 3 different wi-fi adapters, and that wasn't the problem. We have no idea what's wrong? It won't pick up any wireless signals by the way, and it works fine while connected via Ethernet.
I have a home network that does not connect to the internet, but which I use to play games on, or did before this issue happened by.For years my PC's and friends ones had been able to connect into the network with little or no problems, but a few months ago my tower PC just stopped picking anybody or anything up on the network and I have tried tons of different resolutions to solve this.Anyway, the other day I bought a new HD and installed XP SP3 again on it, and for about fifteen minutes I could connect to my Vista Laptop and share files and play games, then it stopped.Next day the same again and off and on till now when its been down for the last week.I have also now bought a new network card - no difference - and disabled the on board network card through the BIOS - no difference.I have done a Winsock repair, replaced automatic IP addresses with manual ones, and countless other remedies which have not solved diddly.
I have connected the computer to the internet a multitude of ways, and no matter how i do it, it always can not receive packets. It is sending packets though.I have tried connecting it directly to the modem, with different wires, through a router, through a network card... I'm pretty much at a loss, im not an expert by any means but im not computer illiterate either. Chances are this is a simple fix... My other computer (the one im on) works fine with both cords, connected directly, and through the router to the modem.
Basically a while ago last year some time in December my desktop got turned on one day and the internet wasn't working. I tried using my wireless to connect but even that was stuck on "acquiring network address". Ive played around with it abit since then and now my etherent cord shows up as connected but when I go into properties it says no packets getting sent / received. In device manager all my network adapters are cool and dont have any "!" next to them.Ive also tried the cord in my laptop and it works cool.
I can connect to it fine and access everything behind the VPN. I have a Windows 7 machine 32 bits. He can connect to the VPN just fine but not access anything behind it, he is running Windows 7 64-bits. This is not a new setup, the VPN has been working before. If I debug ISAKMP and IPSEC in the ASA I see nothing out of the ordinary. The only thing I see is that the VPN client on his machine is showing that the counter for discarded packets is increasing. This is Ciscos explanation to discarded packets. "Packets discarded—The total number of data packets that the VPN Client rejected because they did not come from the secure VPN device gateway." So it seems that the client does not believe that the packets are from the ASA. I have no idea why that would be and what could have changed that made a functioning VPN turn into a non functioning one. He can not remember doing any major installs or something like that which could mess with the client. We uninstalled the version he was using and installed a slightly newer version but it made no difference.
At random times, my internet will "drop" connection and will not download any packets, but I am still able to send packets. My Local Area Connection icon continues to say I am connected, my modem is fully functional, and my cables are good. I can get my internet back up and running for 10 minutes or so by disable and re-enabling my Network Connection. If I simply try the "repair", it gives me an error at the "Refreshing IP" step.I have done a full system scan for viruses and I am clean. My drivers are fully updated, I have disabled my firewalls, and still no luck. During the times when it is down, I can successfully ping my modem through CMD, but I get the time-out error if I ping a site, my default gateway, the DHCP Server, or the DMS Servers.I have made no changes to any major settings on my computer, nor has there been any recent additions/removals of any software.
I have a Asus EEE PC 900 laptop running Windows XP Home. I DO NOT use a modem or router. I connect wireless to someones network (which of course i dont know who it is or how far it is from me) I connect to a Linksys unsecured network. I get good to very good (some times excellent connection from it) The name of my adapter is: Atheros AR5007EG wireless network adapter.Two days ago i was on the internet, and all of a sudden i Lost service ( usually when this happens i wait it out and it comes back)But it hasn't.So I'm checking through my settings and i noticed that im sending way more network packets than receiving. Last i checked it was around 40,000 sent and 5 received. So I wait and wait and wait and the most packets it would go up to is 90 while as sending is still in the thousands.It also says im successfully connected with good to very good connection status (but yet i cannot surf the web because i do not have enough network packets)
I tried different locations in my house (that didnt work)I uninstall and reinstalled my network adaptor (that didnt work)I turned off and on the wireless switch(that didn't work). Im wondering if this has something to do with my laptop or the other persons network? how can I increase the received network packets?
Alright, so we have about six computers on average all on at the same time, working just fine, last night one of the laptops just, stopped working, saying there is no internet access, With every attempt it doesn't send any information. When I disconnect it from the wireless, then reconnect it, it immediately receives packets but won't send any.
I cant connect to the internet. When I use other networks its fine. Also all the computers in this network im trying to connect to can connect and work perfect. I know i have the WPA code right. Its sending but not recieving any packages. The IP address 169.254.140.90 so i know its not working right.
How WEP cracking works. I have a much better understanding now but it seems whatever programs I download and however close I get I always hit a wall somewhere. I am using windows 7 64 bit and my network adapters/cards are Broadcom 802.11n Network Adapter and Broadcom Netlink(TM) Gigabit Ethernet. I am not sure if these are adequate. I was using Commlink and aircrack but not sure if they are compatible and which versions i should have installed. I got as far as the collecting packets stage but the packets that appeared said ENCRYPT which was not correct and then my computer went to blue screen adn shut down and I had to system restore.
An IP packet of size 1500 bytes passes through two network segments before it reaches its destination. The header size of this packet is 20 bytes. The maximum size of an IP packet in the first intermediate network (its MTU) is 1024 bytes, and that in the second network is 576 bytes.Explain how the IP packet described above would be fragmented into smaller parts in a router, paying particular attention to the flag bits and to the fragment offset field in the header.
- Fragmentation and reassembly needs to break a data-gram into an almost random number of pieces that later can reassembled. - It uses the identification field to ensure that fragments of different datagrams are not mixed. - IP packet of 1500 bytes comprises 1480 bytes of data and a 20-byte header. - In the first intermediate network, the packet size of 1024 bytes allows for 1000 bytes of data plus a 20-byte IP header.[code]
