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2answers
30 views

What does a network packet consists of?

I know basic networking but I am not very good at it. Now I am calculating how many packets will be lost if I use UDP over IPv4. I can assume that the protocol overhead for data sent via UDP over IPv4 ...
2
votes
6answers
51 views

Trying to understand IP packet flow

So I'm having trouble understanding how packets travel from one machine to another. Below I've put in an example of Computer 1 trying to connect to Computer 2. Computer 1 IP: 192.168.1.11 Subnet: ...
0
votes
0answers
7 views

How to get packets for a specific access point

I have Wireshark and Aircrack-ng and whenever I capture packets I don't know how to capture packets for a specific network (the network is "2WIRE207"). I need to do this so I can use Aircrack-ng.
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0answers
13 views

CommView for Wifi stops responding after a few minutes

Whenever I am capturing packets for aircrack-ng, after around 5-10 minutes, it stops responding all of a sudden. I am running a Windows 8.1 Pro 32-bit PC. How can I fix this?
0
votes
0answers
14 views

cannot capture packets on wireshark without internet

I am using Wireshark on my Windows 8.1 Pro 32-bit pa and whenever I start Wireshark without internet, it can't capture ant packets. But when I am connected to the internet, it captures packets form ...
0
votes
1answer
9 views

OpenBSD: Prioritizing empty ACKs

There is a wildly used example concerning PF and prioritising empty ACK packets, so that an an asynchronous connections' downstream does not lose performance, if the upstream is clogged up. The ...
0
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3answers
116 views

Network Sniffer identifying strange requests to *.crdui.com

So I just downloaded a Network Sniffer on my local machine, as I think something is going on. As soon as I opened it, selected my network adapter (an LTE stick), it started showing me requests from ...
0
votes
1answer
70 views

Remote Packet Capture using Wireshark

Well The scenario is that I have a Windows machine(at home) and a Linux box running headless Ubuntu server(without GUI) on a remote location. I got Wireshark installed on my windows machine, and ...
0
votes
1answer
79 views

Iptables mark incoming packet - vpn routing

I have connected my home to my workplace for out of house backup reasons through OpenVPN. The connection is working nicely. At work I have 5 fixed IP addresses. Now I would like to assign one of ...
1
vote
1answer
56 views

TCP vs UDP. Sending data on a closed port

I try to understand differences between TCP and UDP packet on the error-checking. I know that UDP packets are connectionless and doesn't care that the packet will arrive the destination safely. And ...
1
vote
1answer
68 views

Why HTTP response is split in 2 parts: header and body?

I'm trying to understand why a single HTTP response is split in 2 parts in the following setup: Requested resource is protected by HTTP Digest Authentication on server side. Communication is ...
0
votes
0answers
59 views

How do I drop a TCP packet matching a certain signature on windows (e.g. firewall-based)?

I am searching for a way to stop a TCP packet with a certain signature and connection from reaching an application. The packet may be dropped completely. The packet contains the byte signature [42, ...
0
votes
1answer
29 views

How to learn the current network scheduler used in my linux machine?

How can I learn what network scheduler for packet selection is used in my linux system? Thanks!
0
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0answers
61 views

How to send packet on tor network to get back to my computer?

Can anyone tell me how to configure system (I think Linux is the best option for this) to be able to send packet by Tor Network back to my own computer? I have to conduct research on how it behaves (I ...
0
votes
1answer
522 views

What is most likely to cause this packet loss?

This question: Can a software cause a huge ping response is what made me realize that I have a network problem. As you can see here: C:\Users\*****>pathping google.com Tracing route to ...
2
votes
4answers
74 views

How does badBIOS jumps airgaps? [closed]

I was reading this article from Ars on badBIOS and came across this line which states the malware, has the ability to use high-frequency transmissions passed between computer speakers and ...
0
votes
1answer
370 views

See file size on wireshark when downloading

Is there a way to see the filesize of a file when starting a download through wireshark? I want to see the size of http downloads on wireshark when i start them but i cant find that information.
0
votes
0answers
108 views

Python library for packet manipulation

I'm looking for a library or module which would allow for network packet manipulation. Scapy is almost universally recommended, but it doesn't seem to have support for Python 3.x or LTS of any kind. ...
1
vote
2answers
102 views

Layer 2 switching or Layer 3 forwarding?

I have a wireless router installed at my home (provided by ISP). Scenario: Router IP: 192.168.1.1 My Machine IP (X): 192.168.1.2 IP of machine Y: 192.168.1.3 Now when I ping Y from my ...
2
votes
1answer
457 views

Change TCP sequence numbers for packet replay?

First off, I'm using wireshark for capture and colasoft for replay. I'm attempting to replay a group of captured packets back, looped to be done several times over (the purpose of this is just to send ...
1
vote
2answers
371 views

Why cocoa packet analyzer shows “capture packets to a trace file” menu?

I am trying to use 'cocoa packet analyzer'('C.P.A'). I uses mac OSX and I installed this from appstore. After installed this, when I launch this program a popup comes out. Others say that to get ...
0
votes
1answer
114 views

Is there a tool or website to generate DNS query packets for looking up the IP address of a hostname?

Is there a tool or web site where I can plug in some values and have it generate the bytes for a DNS query to look up the IP address of a hostname? Preferably one where it explains how the values ...
0
votes
0answers
1k views

Old Look@LAN software gives “No packet to read” log error; then won't ping

Yes, before anyone asks the question, I'm still using Look@LAN. It's the best free network discovery and resources program I've seen (but please, if you have suggestions for newer ones, let me know). ...
0
votes
1answer
188 views

what is the effect of using 'ping -m' (tagging the packets)

i was going through the man pages of ping and i found a -m option there.. so how does this effect my packets? its something like tagging the packets. ping 8.8.8.8 -m 2 ...
0
votes
3answers
131 views

my perl scripts that use Net:Pcap dont work when i port them onto a vm on my server

I am trying to run a perl script that i have scripted to dump the packets from my network, i am using the Net:Pcap and netpacket modules. They are working fine on my and my friend's laptop. but when ...
0
votes
1answer
400 views

How can i connect 2 PC with different subnets in 1 Switch in 1 Router

Well here is the problem...I want to connect 2 PC pc_1: 10.1.1.18/29 pc_2: 10.1.1.66/29 with 1 switch pc_1 -> Switch Fa0/1 pc_2 -> Switch Fa0/2 and this switch to a router ...
1
vote
1answer
125 views

How can I filter incoming packets to my application?

I have only little experience with Wireshark. The problem is that when my server (3rd party app) receives a faulty packets, it crashes. I would need to filter the incoming packets and filter out such ...
3
votes
1answer
237 views

Relation between a packet and a frame over the network

I am learning how networks work and I have a question. What is actually sent over the network? A packet/datagram or a frame? I believe it is a packet. If so, let's say Computer A wants to communicate ...
0
votes
1answer
158 views

Intercept and Edit Packets over a Network Bridge

I've been looking around for a way to intercept a packet as it comes into my main pc, edit it, and then let it continue it's journey to the device bridges though my pc. I've tried writing a c# app to ...
1
vote
1answer
591 views

TCP\IP Packet Signature - how to identify such data packets?

I know of a program that can "carve" (look for) TCP IP Packets from raw binary data. The results it presents are the source and destination MAC addresses, the source and destination IP addresses and a ...
1
vote
1answer
1k views

Jumbo Packet vs Transmit Buffers

I want to increase the transfer speed between two network adapters: 1) Atheros AR8152 PCI-E Fast Network Adapter. 2) Marvell Yukon 88E8053 PCI-E Gigabit Ethernet Controller. Marvell has a "Jumbo ...
0
votes
3answers
174 views

HTTP Packet inspection scripting

I have a HTTP application running on a server. I cannot modify the application, but I would like to trigger an event when a specific POST request is sent to the application. I would like to run a ...
2
votes
2answers
2k views

FFMPEG Errors: “max_analyze_duration” “buffer underflow” “packet too large” What to do?

I have an error while just copying a video with ffmpeg. I use the command: ffmpeg -i leon.mpg -vcodec copy -acodec copy leon2.mpg The errors: [mpeg @ 00000000020ebd20] max_analyze_duration 5000000 ...
0
votes
1answer
58 views

How to transfer packets from ethernet card to another ethernet card

I have a desktop with two ethernet(etho,eth1) cards and OSSIM installed in it. I have a laptop with webmin installed, where i want to write rules for transferring packets from eth1 to eth0. Both the ...
2
votes
2answers
3k views

Are Segments, Packets and Frames the same size if we ignore headers?

I've looked for some explanation about the differences between Segments, Packets and Frames, and from what I read: Segment is the original data + Transport Layer header. Packet is a Segment + ...
1
vote
1answer
107 views

Track down internet PCs communication using network media devices? [closed]

We have a little argue here about is there a way for internet providers to trace your traffic using the network media devices they are using. Some of the folks say that if you are using an other ...
1
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0answers
1k views

Drivers for packet injection on the Intel Centrino(R) Advanced N 6205

I have an Intel Centrino(R) Advanced N 6205, running BackTrack 5 in VMWare. I'm having trouble following the tutorial on aircrack-ng website, and I need to know what drivers to download to support ...
0
votes
1answer
269 views

Check how many packets are being received by each interface/computer on the network

Is there a way I can check via terminal or command line how many packets are being received by each interface/computer on the network? I want to check which PC is downloading a large amount of data. ...
2
votes
1answer
381 views

How do I know if my packet requests are being redirected from localhost?

So I just had a fun and exciting time trying to figure why on earth a particular computer was able to ping different places on the interweb but not browse any webpages of the same places I was able to ...
0
votes
1answer
1k views

How do I send TCP packets with packETH?

I want to send packets to 127.0.0.1:11311 with packETH. However, there are some problems I cannot solve. Here's some screenshots: (click to zoom in) In IPv4 data ("Header length") Header ...
0
votes
3answers
831 views

Packet sent to the default gateway addressed to the same subnet. What happens?

Just a theoretical question (out of curiosity). If a host sent a packet to its default gateway and the packet has a destination address within the IP range of the subnet, what should the gateway do in ...
1
vote
1answer
167 views

Odd internet packet routing

I want to know is there anyway to explicitly control the packet routing. I try to connect my computer in HK from San Francisco. It is extremely slow and I use tracert to see what is going on. It seems ...
6
votes
5answers
7k views

How do IP answer packets reach their destination inside of a private LAN?

This is a little theory question that has been confusing me for a pretty long time. Basically, if we are inside of a private LAN, and we want incoming packets to reach, for example, an HTTP server ...
0
votes
2answers
4k views

Minimum size of the data part of TCP segment

My question has two parts: I know that the "data" part of an Ethernet frame can be 46~1500 bytes. Considering the IP header of 20 bytes + TCP header of 20 bytes, the minimum "data" size of a TCP ...
0
votes
1answer
176 views

What is fjappmgrbulk?

I captured a udp packet from wireshark which ones port is 2510 and destination ip is 81.64.155.202. What is that port for? I found this post) mentioning: "it's for fjappmgrbulk, fjappmgrbulk ...
2
votes
3answers
695 views

Will VPN will slow down VOIP traffic?

If I have a Linux setup with VPN in Paris and a Linux setup with VPN in London, both with high-speed internet, will packet-switching be slower for VOIP than if I didn't use VPN? A few people have ...
2
votes
3answers
180 views

Send cookies/site login information over my internal network?

Is there a way I can send cookies/site login information to computers within my internal network? i.e push them through in packet headers? Not FTP. For example if I want to send cookies with my ...
0
votes
1answer
26 views

reduce the time taken by application packet to reduce ethernet interface on windows?

How do I possibly reduce the time taken by an application packet e.g.like http from a browser to ethernet of same computer on windows 7? I will be programming in visual studio in c++ in few days. I ...
7
votes
2answers
777 views

On an unencrypted public wi-fi hotspot, what exactly is a packet sniffer doing to get another computer's packet?

I get mixed results when reading information security articles, some of them stating that in order to do something similar you need to also setup some sort of honeypot with a running access point and ...
1
vote
11answers
7k views

What's the difference between a TCP segment and a TCP packet?

Is a TCP segment not part of a TCP packet? Here's what I've read: A segment is a piece of application data chopped into a transportable size by TCP and wrapped with a TCP header Isn't the TCP ...