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].

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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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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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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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Intercept network traffic with a hub

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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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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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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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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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 ...
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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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Distributed network with one host behind dmz and the other without

Context: This a question from my homework assignment. There is a company with two sites A and B. B is behind DMZ (firewall - proxy mail server - firewall) and A is just behind a firewall Network A ...
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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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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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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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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
462 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) { ...
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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 ...
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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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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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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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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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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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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 ...
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1answer
156 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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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 ...
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1answer
145 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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379 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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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 ...
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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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395 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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351 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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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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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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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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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 ...
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1answer
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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 ...
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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 ...
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1answer
591 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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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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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 ...
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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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152 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?
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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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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 ...
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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] ...
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IP Spoofing with real IP when TCP 3-way handshake has been made

In a situation, where the spoofed IP is a real existing remote IP and it is found that the TCP 3-way handshake has been made with a server. The MiTM machine sends the packet with spoofed IP to the ...
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Trying to reproduce MiTM attack

Firstly, I would like to clarifiy 2 points: I have hesitated between posting here or on stackoverflow. I don't really understand if it is my code or some kind of security on my router. So, if you ...
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Do network packets capture what gets encrypted in a device?

Do network packets capture what gets encrypted in my device before it gets sent to the host? For instance. In instagram when you log in from a mobile device. You submit a post request. In that post ...
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How to identify a machine by its IP address in wireshark?

I'm new to the world of security and I'm trying to figure out how to analyze the network traffic on my home wifi network. I've been watching a lot of tutorials and reading about how to use wireshark. ...
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When should I generate new public & private keys using RSA?

I'm creating a huge, online mobile game. I have a few questions for you guys because my knowledge in cryptography and sending data across the network securely is kinda poor. Some details: Each user ...
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UDP replay “attack”

Suppose that there is a client-server application using UDP and you have full control over client. The task is to automate few known actions on the client and make them very fast.(Possibly bypass ...