Questions tagged [packet]
Network packet consisting of routing information and a payload. Most commonly an Internet Protocol (IP) packet. For questions about packet vulnerabilities, or tools like wireshark that directly manipulate packets. Related tag: [network].
146
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Android: How to capture packets of an Android device?
For my university project, I need to find out IPs and ports used by an application.
I tried Wireshark for packet capturing as my device and machine is on local network, but it isn't showing packets ...
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1answer
44 views
Detect and optionally block a certain string in network traffic on Windows 10
Suppose I have some important text data on my computer, like a plain text password y5278dhk28ds and I have malware on my PC that periodically searches for sensitive data and sends that data to ...
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2answers
59 views
How far is my Access Point BSSID sent in my internet packets?
My question relates to this question: How does Google know where I am? and ask a similar question to this (but that accepted answer doesn't pertain to BSSIDs).
The chosen answer in my first linked ...
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1answer
124 views
What kind of attack? [closed]
I was able to find the Teardrop Attack.
However, there is another one but I couldn't explain it. It keeps getting the warning: Source MAC must not be a group address. Is this some sort of ARP spoofing ...
2
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3answers
457 views
I can't figure out the abnormal behaviour from this Wireshark capture file
The capture file if needed
There is supposed to be abnormal behaviour here, and I see that there is. But I can't figure out what it is.
There is no response from the ICMP requests. Furthermore some ...
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1answer
70 views
Can you cut up frames/packets and combine them anonymously?
Is it possible to somehow cut up a packet and send it from multiple IPs into parts and send them to one IP address to reconstruct a semi-anonymous packet/frame?
Can frames have their source faked?
...
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0answers
305 views
Intercept TCP traffic using Python
Situation: I am trying to intercept TCP (not HTTP) traffic on a Windows machine using Python. I am posting this question as most answers I was able to find teaches how to sniff traffic.
Normal ...
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2answers
299 views
Capture wireless traffic in PROMISCUOUS mode (not monitor mode)
I am trying to capture packets from other devices that are connected to the same network as I am. I know the difference between monitor mode and promiscuous mode (explained in this question), but for ...
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1answer
57 views
How can one read the time in GPG's Literal Data Packet?
RFC 4880 says that the Literal Data Packet's time stamp is four octets long. Listing packets shows that it is five octets long, at least in GnuPG 2.2.6.
The time stamp comes after the word "created", ...
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0answers
37 views
Detect repeating bits with snort
I am new to snort and I am trying to make a rule that will detect repeating bits in a packet. I set it to offset to the 100th bit and the depth is 105 bits. The problem I am having is I can't figure ...
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1answer
72 views
Intercept network traffic with a hub [closed]
If I plugged a hub inbetween a switch and firewall, that also had a device running wireshark or similar capture software connected, due to the way a hub operates, would I be able to read ALL of the ...
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2answers
95 views
Is using a network sniffer for host discovery a viable option?
Would a packet sniffer like tcpdump be effective for network host discovery and if so how effective is it compared to more active methods such as the infamous network mapper nmap?
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194 views
Meterpreter Over HTTPS Proxy
I have a proxy server on the WAN as well as my box open to the WAN. I want this proxy server to (when it receives a shell), route it to my host so it can be the "man in the middle" between my ...
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1answer
169 views
Can Snort or Suricata *edit* packet on the fly?
I know that they can detect traffic by rules, but can they modify packets on the go?
For example, not only detecting HTTP GET but also adding headers to the GET packet.
If they can't, is there an ...
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1answer
52 views
IP suite packet integrity [closed]
Finally, while the IP header contains a noncryptographic checksum for
verifying the integrity of the header, there is no attempt to do the
same for the payload.
Source(Introduction to Computer ...
25
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2answers
7k views
Why is my computer making requests to my Roku about spotify?
I'm new to inspecting packets with Wireshark so this might be something very stupid on my part. That said, I don't really understand the transaction between my computer and my Roku.
17 1.129097 ...
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2answers
170 views
Please help diagnose multiple incoming packets
We have an internet-facing router and it is significantly slowed down. We investigated the network traffic and came up with following information:
All the packet size is same (i.e. 40 bytes)
All ...
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2answers
2k views
How to intercept http/https requests done by an Android app in plain text? [duplicate]
When I give an android app internet permission and read access to my files, malicious software can send my personal data (pictures and video) to a remote server without me being aware of it.
Is ...
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2answers
2k views
How wireshark capture packets in LAN without arpspoof?
I created a lab environment which has Windows 7 and Kali Linux in VMware.
In Kali Linux, I opened Wireshark and started to listen to traffic on eth0. After that, in my Windows 7 machine, I opened an ...
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51 views
Detecting network attacks by processing individual or multiple network packets?
I am trying to create a tool that identifies network attacks using machine learning, something like a small intrusion detection system. I have collected benign traffic from the network and then ...
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1answer
823 views
How to pass a localhost check for an incoming request?
I'm trying to send a request to an http server hosted on a machine. The http server is in C# and drops any packets that are not from localhost:
public void Request(HttpListenerContext context) {
...
1
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1answer
28 views
How harmfull might be predictable bytes when using AES-CTR
I use AES-CTR to perform on the fly encryption of packets. Each packet is 16 bytes long, however, depending on what is being transferred, the 16 bytes may not be used.
So far, unused bytes are left to ...
2
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0answers
396 views
How can I get Suricata to alert on 1 packet every time
I am trying to write a Suricata signature for testing purposes to alert every time it is triggered with a single PCAP file containing a single packet, but this is proving to be harder than I thought.
...
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1answer
118 views
Are Routers Liken to a Firewall? [closed]
When my ISP came to set up my fiber internet, I told the technician I didn't want a router included within my wired network. He successfully managed setting up the ONT(Optical Network Terminal) ...
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0answers
34 views
Decrypting 802.11 packets captured through wireshark [duplicate]
I created my own network with security of WPA2-PSK, so I know the SSID, and password.
I then connected 2 devices (A and B) to this network and started capturing B's traffic from A using wireshark in ...
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2answers
73 views
What is this address I received from wireshark?
______source____________destination___
41:9c:7f:78:b1:0c | 08:00:d0:58:59:4c
I am trying to identify those addresses, the source and the destination, I thought it was IPv6 but then I realized it'...
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1answer
73 views
Why would the amount of packets received be greater than the amount of packets sent? [closed]
I am new to wifi, and as I was looking at .pcap files, I noticed that one connection took an absurdly large amount of time. Another thing that stood out is that the amount of packets received was so ...
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1answer
87 views
Identify Network of Wireless Packet
When sniffing wireless packets from multiple networks, how do you tell which network a packet belongs to?
The best guess I have right now is that you need to see the handshakes and get the mac addr ...
2
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1answer
207 views
Security implications of setting the broadcast flag on a UDP socket
Are there any negative security effects of setting the SO_BROADCAST option in a C UDP socket? I'm writing a C program and if I just set the broadcast option to 1 then all IP addresses work as intended,...
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0answers
100 views
Small data exfiltration protocol?
I have a small amount of data I want to send at regular intervals, such as from an IoT device. How would I design a network protocol or use existing protocols in such a way that my ISP cannot block ...
2
votes
1answer
180 views
From a PCAP file determine if the address has been spoofed?
Reading about the tool hPing, it is possible to spoof an internal address, on the detection side of this how would one go about detecting this? are there tell-tail signs?
EDIT: thinking about it, ...
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2answers
447 views
Is there a way to tell, when looking at a packet, that an aircrack-ng attack happened?
I'm trying to understand how to find these attacks when using a packet sniffer (specifically using Omnipeek). Is there a way to look at a packet and know that this type attack happened? I want to find ...
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2answers
5k views
Stopping, editing, then sending packets in Windows 10
I was wondering if there was a way to stop a packet, edit what you want, then send it, like a MiTM attack.
Example:
10.0.0.1 has a ncat listener (ncat -lnvp 1234)
10.0.0.2 connects to 10.0.0.1 (nc ...
5
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1answer
1k views
Why is the SSH maximum packet size 32k?
My question has two parts.
First, why must an SSH server have at least a maximum packet size of 32678 bits? It seems a bit excessive for most uses of SSH, excluding file transfer. Is it common for ...
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1answer
450 views
Why doesn't nmap return open port info when I fragment packets?
I'm performing a scan on a remote host and playing around with the -f flag for nmap when I noticed something I hadn't expected. In amongst the other data, when I type nmap -v -O <hostname> I get ...
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1answer
489 views
Are packets processed by a proxy new or modified?
Client ---> First packet ---> Proxy ---> New packet? ---> Server
If we speak about proxy systems, does the first packet get discarded and a new packet gets created, or it's still the ...
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0answers
268 views
Displaying a report of top visited websites per period (HTTP and HTTPS) [closed]
I have a MikroTik router that connects to a network with multiple endpoints. All the WAN traffic flows through this router and I would like to be able to monitor (not necessarily filter) the ...
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1answer
5k views
Proxying MetaSploit through BurpSuite
I was wondering how I would be able to proxy MetaSploit through BurpSuite.
I was to reverse engineer a packet being sent to my ChromeCast, but I have no way of viewing the packet.
Thanks.
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1answer
70 views
Any way to know if a sniffed packet contains a downloaded file?
Is there any way, using TCPdump, Wireshark or any library based on that, to know if someone is downloading a specific file, for example abc.exe, by inspecting the http packet? http, not https
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1answer
359 views
How to inspect TCP Header -> Optional Data with Snort?
I have been looking around for clues on how to define rules, decoders or preprocessors to be able to content-inspect the TCP Header's Optional Data ( The last 0-40 bytes of the TCP Header)
TCP ...
4
votes
1answer
101 views
Would it be possible for an ISP to guess specific requests on an HTTPS site using package size? [duplicate]
In light of the recent senate decision in the US to allow ISPs to sell users' browsing history, I've been reading of recommendations on how users can retain their privacy. One of the common ...
4
votes
2answers
756 views
How does ndpi actually detect the HTTP protocol?
I have been digging the ndpi codebase and trying to understand how its actually detecting the HTTP protocol.
What I found so far is that they are searching the request type in the payload and if not ...
2
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1answer
734 views
Tracking a backdoor by recording packets
I am by no means very bright when it comes to networking. But I know a bit.
Let's say I suspect a backdoor is on my pc.
To counter it I setup a device between the router and my pc to log everything. ...
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2answers
234 views
How much traffic can a firewall node handle? Any real examples? [closed]
As a part of my research, I need to determine the maximum packets (Internet traffic) can one instance of firewall/ IDS process. I am not sure where to begin though.
Your assistance and guidance in ...
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3answers
3k views
Is it possible to see a packet before encryption?
I mean, if I am, for example, on Facebook, every packet I send out of my NIC is encrypted. But there must be phase of that packet before it is encrypted. The browser (I think) must create that packet ...
2
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1answer
299 views
Eavesdropping on a specific port of machine in the WLAN from a different machine, possible? (using arpspoof)
I'm using netcat -l 555 option to communicate between two computers(Linux) on port 555, is there any way I can eavesdrop to whats going on in that conversation from a 3rd computer?
After the second ...
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2answers
157 views
RSSI of wifi device MITM detection
Let's say there is someone doing some malicious activity on your network and you want to track the packet's signal strength to catch the attacker.
Is this theory plausible?
3
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2answers
580 views
How can I tell which process is generating SYN traffic to localhost?
In Wireshark, on the loopback interface, I can see SYN requests from localhost to closed ports on localhost that are being responded to with RST, ACKS.
I'm curious what's generating the traffic. How ...
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3answers
193 views
Who can sniff my packets?
If I make a call to some server who can sniff my packets?
Obviously anyone who is on my network can sniff, but on the server side also?
My call will make several hops to the destination server, can ...
3
votes
1answer
524 views
In TCP, what happens when two Data packets come in with the same sequential identifier, but different data (spoofed)
I'm trying to verify an answer I posted to a recent question:
Client A with real IP has connected ... Now, the attacker machine M sends a [data] packet [with a correct sequential identifier] ...
