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Questions tagged [packet]

The tag has no usage guidance.

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2answers
120 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: ...
8
votes
3answers
484 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 ...
0
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0answers
86 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 ...
0
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1answer
111 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 ...
1
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1answer
35 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
103 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 ...
0
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2answers
35 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 ...
0
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0answers
875 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 ...
0
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0answers
405 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 ...
1
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1answer
36 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/~...
0
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1answer
199 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 ...
0
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1answer
47 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 ...
0
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0answers
182 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 ...
0
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2answers
2k 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 ...
3
votes
1answer
437 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 ...
1
vote
1answer
337 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: ...
0
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0answers
33 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
votes
0answers
550 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 ...
0
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2answers
338 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 ...
0
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3answers
2k 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?
0
votes
1answer
354 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 ...
0
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2answers
45 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?
0
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1answer
209 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 ...
0
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1answer
117 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 ...
0
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1answer
65 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.
0
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0answers
442 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 ...
1
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1answer
2k 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 ...
0
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3answers
9k 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....
1
vote
1answer
282 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 ...
0
votes
1answer
452 views

How can I throttle incoming packets for a specific program in Windows 10?

I want to throttle incoming connections for GTAV.exe. My router doesn't support QoS so I'm looking for a way to limit the incoming packets through software. I have tried creating a QoS policy through ...
0
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0answers
72 views

How to Make a Portable Internet USB Device with Wifi Capability to Send all the data first to some particular device and then to other clients?

I have a portable internet USB device which can also throw wifi signals. All type of clients are usually connected to this device through wifi including PCs and Android devices. Is there any way that ...
1
vote
1answer
2k views

Packets don't come back in a network with NAT in Cisco Packet Tracer

This is my network: I have done my best to try to solve the problem, but with no success. Whenever packets come from LAN 1 or LAN 3, the local IP addresses are translated into one of the 3 public ...
1
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0answers
170 views

How to prevent Continuous ACK packets to my server

I found my server got continuous ACK packets from different sites, never stop, like below(I used tcpdump to capture) the remote sites use https. contains akamai, amazon..etc, which should be legit. ...
3
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2answers
5k views

Using Fiddler 4 to intercept game packets?

I can capture packets sent from my browser, but open games fail to connect through the Fiddler proxy. I know that Fiddler is mainly configured for browser applications, but can I force other ...
0
votes
1answer
645 views

Scapy WPA2 packet forging

Can I use scapy to forge custom packets on WPA2 network? Can I even pack the IEEE 802.11 headers? I have access to the WPA2 passphrase so will there be something stopping me from doing it?
0
votes
1answer
640 views

Why are TCP Packets going from my pc to server owned by EdgeCast Networks, Inc.?

I am seeing a lot of entries like this in my Netgear DGN 1000 log for the last few weeks: Wed, 2015-11-04 20:36:56 - TCP Packet - Source:192.168.0.2,63272 Destination:68.232.44.114,80 - [BLOCK] From ...
0
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1answer
51 views

Inter-network communications

I have an internet connection at my residence through my cable provider. Obviously it hooks into my cable modem which them hooks into my router where the signal is switched to the wireless access ...
0
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1answer
331 views

Packet Loss/High Ping with One Computer Seems to Affect Entire Network

I'm having an issue with my PC. I have a wireless router/modem combo box that was provided by my ISP and am having issues with a single PC on my network. The PC is connected via WIFI and often will ...
1
vote
1answer
51 views

Does Windows 8.1 filter spoofed packets, or packets with bad checksums?

I recently started a software security class. I expect to be required to craft and send packets; yet I read somewhere my Windows 8.1 installation filters packets based on a valid checksum. Is this ...
2
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2answers
2k views

How can I monitor packets sent between two devices on the LAN?

I'm trying to determine the cause of a communication problem between two devices on my wifi network. I CANNOT install programs on them to determine this. How can I monitor the traffic between these ...
-2
votes
1answer
305 views

ISP broadband user Authentication

How does an ISP authenticate a broadband user via its radius server or any other methods. Will it would be possible for me to locate this server eg- packet capture,by halfbridge mode, ip tracert? Is ...
0
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0answers
507 views

Reading packets with Wireshark

How do I read packets captured with Wireshark. I was finally able to capture incoming and outgoing data in hopes of developing something along the lines of an IDS. Thanks in advance for the help. A ...
0
votes
2answers
406 views

How are Internet connections differentiated from each other by an operating system?

Given this example, how would my operating system differentiate between each request. Let us say I have 3 tabs open, and at the same exact time, they all go to http://google.com. How would my ...
1
vote
0answers
167 views

Can we send and receive uTorrent packets through TOR?

I just started using pcapy python module to capture network packets. Is it possible to capture packets going out from uTorrent (on my own machine) with pcapy or scapy and sending them over the TOR ...
0
votes
1answer
6k views

Overlapping address error in Packet Tracer-Possible subnet error

I am working on my hands on final exam for Networking Fundamentals. I have accomplished everything except for putting the 4 devices on two separate subnets. These are my subnet calculations: Given ...
2
votes
0answers
1k views

Modify incoming packets before forwarding in Linux

I’m using a Linux (Debian based) system on which IP forwarding is enabled (/proc/sys/net/ipv4/ip_forward is set to 1). I can read the incoming packets using a raw sockets program, but I want to modify ...
-1
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1answer
152 views

Modify a packet's content on DD-WRT

I need to modify incoming data to my network. Specifically, I want to modify all responses from a specific internet site so it doesn't show a certain HTML element. Is this possible with DD-WRT/...
0
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1answer
188 views

calculate time taken to reach from network A to B without ping and telnet

I want to find distance between A and B either in terms of network time or Hops count.I have few ideas like I can ping B from A will log down time taken to respond that ping request . Also If I know ...
0
votes
1answer
902 views

Is it possible to sniff packets on other subnetworks?

I've been reading about packet sniffing and was wondering if it's possible for someone to sniff packets on subnetworks other than the one they're on. Since the point of a subnetwork is that devices ...
0
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2answers
1k 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 ...