Network Security - securing network infrastructure and connections

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Surveillance cameras go offline every 30 minutes or so

I'm setting up a 4 camera security system with an Anran Digital Video Recorder (Model NVR6008T), and keep having the cameras go offline approximately every 25-30 minutes. They stay offline for ...
42
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1answer
1k views

WPA2 ephemeral key derivation

I'm trying to learn how ephemeral keys in WPA2 4-way handshake are derived. Starting from 4 EAPOL packets sniffing, I successfully derived PMK and PTK reading ANonce, SNonce, and knowing ASCII-PSK ...
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1answer
28 views

Application proxy structure & funtions

http://postimg.org/image/76newirnv/ For application proxy, Firstly, what does it mean "A proxy is something that acts on your behalf"? Can anyone give a more detail explanation about proxy? I read ...
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0answers
38 views

Firewall source and destination IP validation

For an external firewall interface, why is it a good idea to validate that the source IP address was initiated from an internal IP, or why it originated from an external IP? If, hypothetically, the ...
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3answers
55 views

Is running SNMP v2c really insecure and can lead to compromisses?

I currently use SNMP v2c to monitor switches, servers, ect... to graph for performance. Question in terms of SNMP. Everyone says that running SNMP insecure is a security risk. How is a graphing ...
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4answers
147 views

How can I mitigate the risk of my wifi key being shared with strangers through apps?

Sometimes a guest asks for my wifi password, and I gladly give it to them. Sometimes that guest has a wifi sharing app, and said app shares the key with totally random strangers (I know there is some ...
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1answer
63 views

Best option for DDoS protection on DigitalOcean server?

I would not like to use CloudFlare since they effectively act as a man in the middle and handle unencrypted data. Is there a CDN that mitigates the security risks that CloudFlare imposes? If not, is ...
2
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1answer
60 views

Man in the Middle attack?

in a scenario where I have a gateway to the Internet and a switch(layer 2) connected to this gateway. I have two computers in the same broadcast domain connected to the switch. all traffic to the ...
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1answer
38 views

using VLAN to mitigate ARP poisoning

hi I have been told VLANs can help mitigate ARP poisoning because they can be configured with different broadcast domains. and arp works using a simple broadcast domain. can someone explain how the ...
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1answer
38 views

open network access, common problems?

what are some common problems for companys who offer "guests" - people that word for a different company at the first companys building - internet access? my guess would be easy to sue downloads like ...
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3answers
108 views

Jump Servers for security

In my network, I have the clients directly connected to the server; but in the new PCI policies, they required to use jump servers. What is the advantage of using jump servers for security reasons? ...
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3answers
1k views

Encryption of PCI data, and PCI-DSS scoping

I read another question which made me think... If you encrypt PCI data (credit card numbers, etc.) using PGP or AES and send it through a firewall, is that firewall in scope? Alternatively, what ...
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4answers
14k views

How can I keep a roommate from seeing my web activity?

I have a roommate who is a network security engineer and I think he hacked our home network and now knows what sites I am visiting and what I am doing online. Although he is not stealing anything I ...
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62 views

How can I hide my activity from our network or IT admins at university or especially work? [on hold]

I both work and study. I recently found out that I am being monitored. I have the fear that the administrators can easily read my emails and have access to my passwords. For work sometimes I have to ...
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0answers
37 views

Could you reccomend me a book about Metasploit Framework? [on hold]

I am doing some pen testing and recently encountred Metasploit Framework. I would like to try it or better learn to use it, but wasnt able to find any good book. I found few but they were like 10 ...
4
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1answer
1k views

Snort even though working properly does not report majority of rules

I have installed Snort 2.9.7.0 and it does not detect majority of attacks, such as nmap port scans, downloading exe files, opening documents containing keyword "root". I use Snort together with ...
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2answers
80 views

Hiding my activity from mobile service provider [duplicate]

Ok there is mobile service provider which also happens to be providing mobile internet. Now, I am interested to hide my activity from that provider. e.g. it can't see my browsing habbit. Basically ...
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1answer
32 views

wpa_passphrase command encrpyting psk

Does the wpa_passphrase command turn an ASCII string into hexadecimal and what is the benefit of doing so? Is the psk sent in the header of packets? Can it be easy to sniff if it's in a string format? ...
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1answer
68 views

How safe is to leave a open port on router without anything listening to it?

I'm using plex remote, and I have a double-NAT on my local network, so I need to open ports on the two routers. As far I know, I have made secure connections to be required. And I don't plan to ...
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3answers
4k views

How to detect a virus in a network card?

How can I know that a network card in a server was infected by a virus or not? Are there any methods to check it?
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6answers
17k views

How to detect eavesdropping by your ISP

I've noticed some funny behavior lately with my home Internet connection such as connections dropping frequently, rate limiting occuring, and packet loss. I know how to get around this online, use a ...
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1answer
43 views

understanding where tor interferes (screenshot)

with just goal to better understand where tor interferes and where it hides my browsing from ISP, please look at this picture which just explains how to computers communicate. You can check on step ...
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1answer
85 views

How to capture all traffic from a new device?

I have a new IoT type of device that requires a wifi connection to work. I have no use for the device but I'd like to poke around it and learn more about it. How should I go about intercepting every ...
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3answers
112 views

How a professional hacker would penetrate a computer in a network?

Which kinds of vulnerabilities or security holes a hacker would use to penetrate and take over a computer in a network, like a normal PC in a default network (Wireless-LAN). I often hear that the ...
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1answer
43 views

How to sniff 802.11 packets without going into monitor mode?

Is it possible to sniff or capture 802.11 packets which sends my computer to the router (AP). I know that I can't sniff packets which have a other destination MAC address without going into monitor ...
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0answers
28 views

rdp connection with netcat pivoting

I want to connection from local computer to another local computer. I have 3 machine. for example A: 192.168.1.50 -> in local windows machine B: 50.3.52.110 -> linux server C: 192.168.5.25 -&...
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3answers
419 views

What service could penetrate my Firewall via UDP on Port 17275?

Has anyone monitored various requests from all over the world on Port 17275 via UDP? My firewall logs show huge amounts of such requests from lots of different IP Adresses. I can't find any ...
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40 views

How can one track the origin of an image shared in Whatsapp? [closed]

How can one track the origin of an image shared in Whatsapp?
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2answers
71 views

What phases does a network penetration test consist of?

What are common phases of a network infrastructure penetration test? Staring with discovering IP's and ports? A simple vulnerability assessment, checking version information of banners from different ...
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4answers
14k views

Is there any solution for block the HTTPS traffic using URL filtering?

The URL filtering can block the HTTP traffic but not the HTTPS traffic in Internet Explorer. For example, the website http://www.facebook.com is blocked by the URL filtering while the https://www....
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3answers
3k views

What is same site scripting and what are some exploit scenarios?

I know it is an issue with how DNS is configured , but is it really dangerous if the attacker couldn't access your network?
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2answers
413 views

Is it possible to identify the source of message in whatsapp?

Is it possible to identify the real source of message in whatsapp? Scenario : Texting whatsapp message to a group,one of the group member forwards it to another and it goes on atlast one day it ...
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3answers
237 views

Can CloudFlare be DDoS-ed and issn't the actual DDoS mitigation limit, financial resources?

CloudFlare (known for fighting DDoS-attacks) is explaining quite a lot about DDoS on their website cloudflare.com/ddos. In an article named The DDoS That Almost Broke the Internet they write about a ...
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25 views

Authentication in WPA from a user's perspective

I have read several articles that discuss the differences between WEP and WPA but I haven't seen an answer to my question, which is : How is the authentication used in WPA different from that used ...
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4answers
30k views

How to know what others browse through the network?

My friend connected to WIFI and after 5 minutes he told me which sites I had actually been browsing, and who I chat with. My question is: how do I defend myself against this, and also how did he do ...
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0answers
40 views

Is filtering flash based on the mimetype enough to keep it out?

As flash is a real security mess I started blacklisting flash at our proxy by blocking any content with the mime type application/x-shockwave-flash which works pretty well as far as I can tell. The ...
3
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2answers
72 views

As an end user on a network, how can I avoid being MITM'd by an SSID-spoofing device?

I've been looking at SSID spoofing devices lately, including the Wi-Fi Pineapple and similar hardware. While these types of devices seem very useful to someone who's up to no good or working as a ...
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3answers
94 views

Understanding a DMZ with multiple servers

I get the general principle of a DMZ i.e. place public facing servers in the DMZ to isolate and protect the corporate LAN. I have a web application which is to be public facing, this web app needs to ...
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2answers
88 views

What is the likelihood of a NAS getting hacked? [closed]

I'm looking at NAS (network attached storage) to use as one of several backup storage devices to store my data, since I cannot find a DAS (direct attached storage) with RAID functionality (all of the ...
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2answers
166 views

Is it possible to bypass sniffing when using port mirroring?

INTERNET <-A-> ROUTER <-B-> PC Let's theoretically think we mirror the port on a ROUTER to a file. So the full network traffic on it. Question: is it possible to still have ...
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2answers
49 views

Relaxed access to tcpdump

I'm looking to do some packet sniffing on a computer that I do not have privileged access on. I am considering asking the admins to allow users in a specific group access to tcpdump. Specifically, I ...
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4answers
69k views

IP address of an iPhone

Recently I logged on to my bank account via the Chase app on my iPhone. I received a message that another device was currently logged on to my account and "would I like to end the session"? Of course, ...
17
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4answers
20k views

With IPv6 do we need to use NAT any more?

I'm wondering how to use NAT with IPv6. Seems that you don't even need it any more. So what exactly is the concept behind firewall configurations in IPv6 environments?
28
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6answers
10k views

Is pinging a website essentially the same as visiting the website through a browser?

I was looking at the domain information of a website (poaulpos.net) on who.is that Chrome connects to whenever I visit a specific an old Tech Times article about Thunderstrike 2, a Mac firmware attack ...
71
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3answers
81k views

Is it a bad idea for a firewall to block ICMP?

This question was inspired by this answer which states in part: The generic firewall manifest file finishes off by dropping everything I didn't otherwise allow (besides ICMP. Don't turn off ICMP). ...
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1answer
59 views

Using old router as wi-fi extender/extra security on shared network?

I just moved into a building with three apartments, all of which split an internet subscription. There is only one router, however, in one of the other apartments. For security/privacy purposes, I'd ...
5
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2answers
114 views

Set up a system to sandbox/capture outbound traffic from Windows PC?

Does anyone know of a program/system that is purpose built to allow you to sandbox/contain an outbound connection from a Windows PC? The aim being that you can analyse the data being sent via the ...
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1answer
52 views

Shared folders in Windows to/from unsecured PC on the same network

I have a Windows 10 desktop computer which is my main device. It's password-protected and I'm not concerned about it being physically accessed by bad actors. I have a Windows 7 laptop with a fresh OS ...
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0answers
51 views

Identify malicous hosts in our network by sending valid domain credentials

We are currently whitelisting the hosts owned by our company on our Cisco switches to prevent private hosts in our network. This works pretty well but someone can still spoof the MAC address of his ...
3
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3answers
109 views

VPN server in a router [closed]

I am new to using and configuring VPNs. I was thinking of setting up my router as an OpenVPN server, but as I understand that is to connect form the outside to my network. However, I want a connection ...