Questions tagged [packet]

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Retrieving MAC address via tunnel

Currently I'm working on adding my own software to provide internet support to an old MS-DOS game. Because my primary environment is Linux, I use DOSBOX from within Linux and feed my internet ...
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Finding the device in LAN network which is sending packets that do not allow phone to go to sleep [migrated]

Bear with me because I think this is a really odd situation. It all started by noticing that my android phone (and some other phones) loses more than 10% of battery during night while doing nothing (...
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13 views

how can i capture wifi packets of a specific AP? i need to see the packets rssi

I need to catch packets of a specific AP in my range and display the rssi of this packets. I tried to use "airodump−ng −−bssid $1 −−write capture. pcap wlan0mon" and then analyze it with ...
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1answer
29 views

Why are packets taking 64 hops to connect from my laptop to my laptop?

So, I'm pinging my laptop (from my laptop) expecting the TLL in the reports to be 128 (Because I'm on Windows 10), but I get this instead: Pinging [REDACTED] with 32 bytes of data: Reply from [...
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1answer
45 views

How to capture packets at the “DSL side”? [closed]

https://osqa-ask.wireshark.org/questions/23522/capture-packets-from-my-broadband-modem It is written here that capturing packets passing through the modem at DSL level, would only be possible with ...
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11 views

Wake on LAN Broadcast on Startup

I have Wake on LAN configured on a few of my devices (all Ethernet Connections). I have recently noticed when I start windows 7 on a laptop I have (wireless), when the logon screen appears (not logged ...
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1answer
23 views

Rx packets being discarded

last month my apartment was connected to fiber optics but a problem keeps occurring that occasionally every 5-10 minutes my internet would freeze for a few seconds, tried to switch the router, the ...
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69 views

How to route all Ethernet traffic to a Serial port on a Linux system?

How can I route all Ethernet traffic on a Linux system to a Serial port and the opposite? I want to convert from the first architecture to the second one, as shown in the picture: picture I monitored ...
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32 views

Is there a difference in conntrack between active and passive ftp connection?

Suppose I did connection tracking to and from my computer and some ftp server, on active mode, with ip_conntrack_ftp on: iptables -t mangle -A OUTPUT -d [MY IP] -m conntrack --ctstate NEW -j LOG --...
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551 views

Getting Kicked from a Video Game, suspect internet issue maybe to blame

Recently (since March ish) I have been getting kicked from a game (Minecraft) seemingly at random, with issues like: "System.OverflowException: VarInt too big" "internal exception:io....
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2answers
36 views

Packet forwarding in the same network

I know how port forwarding works. but, if two devices in the same network are running the same process, for example suppose two devices are requesting for an HTTP response. Since both services will be ...
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2answers
65 views

Connection suffers from “packet loss” and trace route

My internet connection has been suffering from packet loss for weeks and I'm trying to find where it is happening. It can go up to 35% packet loss, which is terrible and it's really bad when playing ...
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1answer
64 views

Send packet to a machine behind router

Context I'm learning how the internet works, and I am trying to send a TCP packet from my VPS to my computer. My VPS has a specific public IP address so I can easily send from my computer to my VPS. ...
2
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1answer
191 views

How do I fix bufferbloat without introducing packet loss?

I just installed SQM QoS on my Linksys E4200 (V2) in order to fix some, frankly, horrendous bufferbloat. This seems to have fixed the issue, however, it has now introduced bad packet loss that wasn't ...
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1answer
13k views

Cisco Packet Tracer: Clear screen (cls) in PC Command Prompt

I notice that cls and clear command doesn't work in Cisco Packet Tracer's PC. Is there a way to accomplish this?
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1answer
23 views

Confused about HTTP in Wireshark

I'm currently using Wireshark and I'm trying to fill out a table that what's the Packet Number for the HTTP request and HTTP Response. I've used the filter in Wireshark however, I'm not sure what ...
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1answer
207 views

How Router Sends Packet to Correct Location?

Lets take an example: PC 1 (1.1.1.1) | |----- **Router 1** (IP 3.3.3.3) ------------- **Router 2** --- Google Server(8.8.8.8 for eg) | PC 2 (2.2.2.2) In this scenario, Lets say that ...
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2answers
104 views

What happens if a computer has a packet destined for a destination address that it cannot recognize?

What happens if a computer has a packet destined for a destination address that it cannot recognize? What will the computer do with that packet?
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1answer
109 views

tcpdump: “packet exceeded snapshot”

I am using tcpdump to look into some pcap files, but in the output, I see the following error, instead of getting the header information: packet exceeded snapshot I googled it, but I couldn't find ...
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1answer
534 views

RTP Streaming using VLC - Getting huge transmit UDP packet loss on my PC - why?

I am getting strange problems on my Windows 7 PC: I have tried to setup VLC media player to stream audio through RTP, however I am getting huge outbound UDP packet lost. After some debugging, I ...
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1answer
95 views

What happens if a second HTTP request is made before I receive the response of the first request?

Suppose I made two requests from my web browser to a web server. I am sending the second request before I get the response of the first request. I know the response of the later request is rendered on ...
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1answer
465 views

Is it possible to put my network card into Monitor mode without root privileges

I want to put my network card into monitor mode to try out some simple network packet capturing but i need to have root on my user account in order to enable it. is There someway to do this without ...
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1answer
373 views

DPDK installation on UBUNTU 18.04

I have been given a task of installing and running DPDK on ubuntu 18.04. However, I have no idea about linux and DPDK is entirely new thing for me. Please guide me on how to install it including ...
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1answer
54 views

How does a router know which device handles calls?

How does a home router know which connected device is meant to handle a VOIP call? Is there a specific broadcast that is sent out? My home setup uses an analog telephone adapter (ATA) box in bridge ...
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1answer
351 views

Profibus or MODBUS over RS485

We are operating old systems which have many modules we are not able to find on the market. So we are looking for replacements. S7-200 PLC with several sensors is communicating over RS485 pair cable. ...
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0answers
67 views

How default Web Page is loaded with just TCP connection and no HTTP transaction?

Below is the packet capture from WireShark when a web request is made to the Google Server 172.217.26.228 is the IP address of the Google Server. Filter that I am using is (ip.dst == 172.217.26....
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3answers
482 views

Is a DNS packet with only a header (no questions or resources) valid?

Looking at RFC 1035 I am trying to determine what the proper response is for a packet that contains nothing but a DNS header, where all the "counts" are zero: id short X qdcount short ...
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2answers
937 views

What's the right way to send an Ethernet Frame to another machine in the local network?

I recently began learning about the OSI model, networking and stuff. As I like coding in C, I wanted to send my own Ethernet frames. I now got it working; however, I'm still unsure about one thing: ...
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3answers
13k views

Intercept HTTP/HTTPS traffic of one application (Windows 10)

I'd like to capture all traffic from one particular .exe application. I tried to follow this guide with only the one application running on a windows 10 VM, but the VM was very slow and crashed a ...
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0answers
217 views

Enabling packet forwarding on linux VM

I have a linux VM running on my mac. I enabled port forwarding to forward any traffic to my machine to my virtual machine, where I had a netcat server logging the traffic to the console. This worked ...
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1answer
2k views

Practical (vs theoretical) max limit of TCP packet size

I'm a web developer who is pretty new to the industry. I was presented with a coding challenge for a job interview where I need to design a messaging system and architect a system for how it deals ...
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1answer
69 views

How to configure OS to re-assemble TCP segments

I have an application that is reading in TCP data from a socket. The sending device is sending out a full 1400 bytes of data to the server's socket on the other end. Somewhere along the way, the ...
2
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2answers
258 views

Why do we need to chop/chunk the data while transmitting it over the network?

In networking, if the application can generate a stream of data then why can't the data be transmitted over the network as a stream of data? Instead, why is it chopped/chunked before sending across ...
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2answers
105 views

Packets sniffer and domain

I have a doubt about packets sniffer. I read that it can sniff only in local segment and often it is referred as collision domain. But... The collision domain for a switch is each single port ...
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736 views

Can I capture all packets to/from a router?

I have a router connected to a number of devices through DHCP. I face frequent internet disconnection issues as I believe some kind of DOS attacks choke my port. Is there any way I can capture all ...
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1answer
73 views

Internet Protocols: calculating end to end delay when a header is added to each packet

I have been trying to teaching myself about internet protocols, and I learned how to calculate the end to end delay for a packet switched network from this website (1c): http://www.ics.uci.edu/~...
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1answer
572 views

Use of RTP Marker Bit

RFC 3551 indicates that it should be set only on the first packet for a talkspurt and that it must not be set if silence suppression isn't in use. I am not clear though on whether or not there exists ...
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1answer
100 views

How to read and interpret Packet Formats in RFCs (Request For Comments)?

Often times when I am reading Request For Comments documentation, I always see the packet format section for a protocol outlined like the one below. My question is what do the numbers and different ...
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290 views

How to identify a LDAP packet/frame

I'm developing an application in Java which needs to know if a frame contains a LDAP packet or not. So far, I've figured out how to find out if the frame contains IPv4 and TCP headers but how do I ...
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2answers
4k views

How to decrypt 802.11 packets manually?

Without using Wireshark, how are 802.11 meant to be decrypted? I know the EAPOL and passphrase are required, but what are the steps required to perform the decryption? Another way to put it is, how ...
2
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1answer
980 views

How does DLC address relate to the MAC address?

The Network Engineering help seems to negate this question in their forum. A MAC address is hard coded, all 6 bytes, agreed? The DLC seems to be a variable address of 3 bytes in front of the OUI ...
2
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1answer
806 views

Battlefield: Inspect packet-loss and packet-return-time of multiplayer game

I'm aware that this is an unusual question, but it seems the people here are very likely the ones who can help. I'm trying to debug with my ISP why I'm having extreme lags during gameplay. Question: ...
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54 views

Having too many ADPM and ICMP log in router admin panel

Recently, I feel that the speed of network became too slow. And I open router admin panel and have a look at the log messages. I found that there are many messages contains word "ADPM" and "ICMP", I ...
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0answers
641 views

Using Netsh on Windows 10

I am stuck in a scenario where I can't install third party softwares to capture the network traffic on Windows 2012 R2. Earlier I have used netsh on Windows 2008 R2. The command which I have used to ...
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2answers
521 views

Wireshark Remote Packet Capturing

Just started to learn Wireshark. I learnt how to capture packets from my system to any other to which it sends the packets. What if I want to track all the packets flowing through my router, as if I ...
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3answers
8k views

How to filter packets with distinct source address in wireshark?

I have a pcap file and I want to wireshark shows me packets with distinct source address. How can I do this in wireshark?
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1answer
664 views

Remote Packet Capture using Wireshark (Windows)

I am trying to set up remote packet capture amongst 2 machines within my network. I have installed Wireshark and WinPcap on the server and I have installed WinPcap on the target. I have both turned on ...
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2answers
202 views

When a host needs to send packets to another host within the same network

Does the data still go through the gateway (router), or can the data be sent directly, and therefore the gateway is not used?
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1answer
357 views

Blocking Virtual Machine (VMWare) IP on host PC

I have a packet sniffer/analyzer running on my host machine which reads packets sent and received between two virtual machines (using VMWare). Both virtual machines' networks are NAT. The packet ...
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1answer
168 views

How is it possible to handle large packet loss?

I currently live in a dorm, and the internet connection is really poor here. The speed is not bad, but around 25% of the packets are lost (randomly). The management knows the problem, but they don't ...