Questions tagged [packet]

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20 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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0answers
35 views

How many collision domains and broadcast domains are shown?

My guess is that there are two broadcast domains and eight collision domains. I'm not sure, the connection between swithces makes me doubt. Thanks in advance!
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0answers
34 views

Packet tracer to oracle virtual machines

Is there a way to integrate a virtual router such as Packet Tracer to the Virtualbox workstations? This is because I want my virtual machine computers to be connected to a router that I configured.
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1answer
30 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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1answer
84 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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0answers
2k 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
128 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
37 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
50 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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0answers
19 views

Forcing Single Thread from Multi-threaded Applications

I'm currently working on a packet generator, however, before moving to multi-threading from my single thread state, I thought it would be wise to compare my current results with competitors. But as ...
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1answer
324 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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0answers
30 views

How to solve problems with openssl version (Packet Tracer)?

this is the problem: I had installed Packet Tracer in my computer with OS Fedora 27, when I ran packet tracer program, I detected some problems, there were some missing libraries, (e.g Qt5, libcrypto....
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0answers
38 views

Why packetbeat drop packet with elastic search on local machine

I am trying to capture my network interface card traffic on my local machine. But Packetbeat is not capturing all packets. This is the error I am getting. {"monitoring": {"metrics": {"beat":{"cpu":{"...
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1answer
41 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
220 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
297 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
48 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 ...
3
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1answer
243 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
45 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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2answers
279 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
568 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
9k 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
142 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
1k 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
58 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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2answers
120 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
79 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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0answers
1k views

How to decrypt .pcap file captured by Packet Capture on Android?

I use Packet Capture on Android in order to capture packets. It installs certificate on Android in order to be able to capture encrypted packets. The .pcap files are saved in encrypted form on the ...
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0answers
690 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
65 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
462 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
61 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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0answers
279 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
802 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
687 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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0answers
50 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 ...
3
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0answers
626 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
498 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
6k 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
615 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
127 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
313 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
147 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 ...
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1answer
72 views

Regarding IP on Packet Tracer

I mistakenly gave the IP while configuring the topology in Packet Tracer. How to remove the IP and give the new one? I gave the IP 192.168.1.100 but I need to change it to 192.168.1.0.
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0answers
734 views

How can i communicate with an HTTP server behind a VPN

I have a VPN which allows me to port forward. The VPN client shows the assigned IP:port on connection. I would like to run an HTTP server behind the VPN. I've got the following pf rule to redirect ...
2
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1answer
3k views

Jumbo packet can work in wireless port as well as ethernet port?

I can set the ethernet port MTU to a maximum 9000 however I can set the wireless radio MTU to a maximum 1630 only and the largest pace size to pass across the radio will be 1602. Is there any MTU ...
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4answers
19k views

Jumbo packet ping from PC (windows 10)

Referring to this link How to test if 9000 MTU/Jumbo Frames are working - Blah, Cloud. I tried to follow its instruction guide to ping Jumbo packet from my PC (Windows 10). ping -f -l 9000 192....
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1answer
479 views

netem packet loss for packets destined to the same machine

I am using a command like sudo tc qdisc add dev eno1 root netem loss 10% to delay all the outgoing packets over the interface eno1, but this won't work if the packets are destined for the same ...