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Questions tagged [packet]

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How to trace where packet is being dropped on the route?

I have a server address with both 443 and 80 ports open. I can connect to 80 just fine but 443 is being cut. I want to know where, at which point on the route, it is being dropped. How can I get this ...
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pathping command columns understanding

when we run pathping command on windows we see different columns showing the detailed statistics. just want to know difference between source to here column vs node/link column in detail? when I ...
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Device communicates with server through bridge, unable to capture all packages

I'm trying to reverse engineer a device to be able to access its API locally. Currently it is communicating with an online server, where I can log into to see its data. Set up The device connects ...
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1 answer
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Capturing management frames using Windows Network Monitor

I am trying to capture network traffic - specifically management frames (and from these, particularly beacon frames) in Windows. My wireless NIC is Intel Wifi AX201 160mhz, which seems to support ...
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1 answer
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Firewall blocked port telnet 23

I have an one firewall table with several entries. Among these one entry is with destination port 23. I don't understand what's the meaning to block destination port 23. After asking my teacher to ...
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Wireshark is not display the packets between the client and server

On my machine there a TCP server is running @port 54000 which is a echo server it sends the same message which is sent to it. I have multiple clients which is connected to this server. Clients and the ...
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Export object options greyed out. How to export objects?

I'm following a tutorial for detecting malware with wireshark. In the tutorial he exports all http objects. When I try to export all http objects the information is greyed out. I'm on version 3.4.6. ...
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Good Speed but slow browsing

I installed a new Fiber connection of 30 Mbps up/down speed. I tested download some files on the connection the download speed is very much stable and almost 30 Mbps but the problem arrives when I do ...
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1 vote
1 answer
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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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1 answer
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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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-1 votes
1 answer
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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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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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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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2 answers
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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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2 answers
109 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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143 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. ...
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2 votes
1 answer
322 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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3 votes
1 answer
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Cisco Packet Tracer: Clear screen (cls) in PC Command Prompt

I notice that the cls and clear commands don't work in Cisco Packet Tracer's PC. Is there a way to accomplish this?
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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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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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-1 votes
2 answers
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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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1 vote
1 answer
153 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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1 answer
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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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1 vote
1 answer
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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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1 answer
590 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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1 answer
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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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0 votes
1 answer
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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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3 votes
1 answer
491 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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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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2 votes
3 answers
668 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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3 votes
2 answers
1k 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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12 votes
3 answers
18k 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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1 vote
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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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2 votes
1 answer
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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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1 vote
1 answer
93 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 ...
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2 votes
2 answers
504 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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2 answers
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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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0 answers
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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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1 vote
1 answer
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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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1 answer
617 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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0 votes
1 answer
184 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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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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2 answers
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 ...
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2 votes
1 answer
1k 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 ...
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2 votes
1 answer
924 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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0 answers
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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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3 votes
0 answers
661 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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0 votes
2 answers
555 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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3 answers
11k 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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1 answer
691 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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