The Internet Protocol (IP) is the main protocol for sending packets accross the internet. It belongs to the internet layer in the internet protocol suite with the variants IPv4 and IPv6.

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How important is split-horizon DNS?

Split DNS returns different results depending on the source IP. It's commonly promoted as significant security measure for internal resources, for limiting enumeration and discovery. I've had many ...
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85 views

My IP address switched suddenly and then switched back

Sometimes I look at the login history of my blog account (a Tumblr blog) to make sure no one else is logging in (because I have private posts that I want to keep private). Even though today I ...
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2 IP cameras with same configuration but different behaviour [migrated]

I have a Vodafone Station router, and 2 IP cameras connected to it through an Ethernet cable. Both have the same configuration. Both DHCP enabled, one has IP 192.168.1.10 with port 81 and the other ...
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23 views

Webrtc privacy issues?

I've been reading about WebRTC, and I'm interested in using it for a drawing web application that uses real-time collaboration. However, as I understand, WebRTC communication requires all parties ...
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82 views

Is encryption possible for simplex (one-directional) TCP/IP, and if so, how?

As explained in the TCP/IP Guide, it is possible to configure TCP/IP to operate in simplex mode and this mode is utilized, among other things, in communication from satellites. One consideration with ...
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59 views

How to see all incoming and outgoing traffic of other nodes while on a LAN?

I've got two computers. A & B. While sitting on the computer A how can I see the incoming and outgoing traffic of computer B? Or can I? Note: Please try to answer in a non-technical language as ...
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8 views

PC Unathorized Access [closed]

How can I explain to a computer repairman that I want him to evaluate my PC for evidence/signs of third party remote access having been done? Also, my IP address shows up on a site devoted to ...
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19 views

Options to protect an outbound initiated connection IP?

Consider a service that has 3 separate organizations in a SaaS model. The end user(#1) connects to the first provider(#2) and then initiates a function from within the #2 that connects directly to ...
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182 views

Is it Feasible to Block Connections That Windows 10 Uses to Push/Pull? - ie: Phone Home, Watchers, Monitors, Onedrive, Cortana, Bing, Shadyness, Etc?

Even with all the privacy, sync, and p2p settings off, using an offline account, I don't feel safe using Windows 10 for a business. I would like to restrict its ability to communicate to Microsoft (or ...
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229 views

Why Skype discloses my IP address to anybody? [closed]

Apparently there is a Skype exploit that allows people to obtain your IP address through your Skype username if you're online. The problem has existed since 2012. There exists countless websites which ...
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3answers
153 views

How can an organization know my age based on my IP address?

My teenage daughter was recently banned from a teen forum. The response we got from the forum administrators explained that she was banned because the IP address revealed that she was "over age" (too ...
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Why do people use IP address bans when IP addresses often change?

Why do people use IP address bans (e.g. to block a malicious user from an internet service) when IP addresses change often? For example, we turn our router off every night so our IP address often ...
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2 External IPs to prevent DDoS?

In my home network I currently have a Hitron cgnm-2250 acting as a modem/router combo with an IP Passthrough option enabled for a 2nd router connected to it (ddwrt nighthawk x6 r8000). I already have ...
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Do iPhone Chrome & Safari keep refreshing and sending my IP address to websites while in background?

You can put a browser like Safari or Chrome into the background on iOS without closing your tabs. Will they keep refreshing themselves and send out personal details like your IP address? What about ...
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Filtered ports - What exactly filters them?

By the NMAP definition, unfiltered ports are the ones which cannot be determined to be open or closed since packet filtering prevents its probes from reaching the port. (ISBN 9780979958717 pag. 77) ...
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How can I find the origin of an IP address for a relayed IP?

I have an IP address of someone who has stolen from my company, but I'm pretty sure they relayed through another computer. The IP address I have doesn't go to home or business, but to a field in the ...
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Why is my internal IP address (private) visible from the Internet?

When visiting some websites like http://www.monip.org or http://ip-api.com, I get the following result: Your current IP Address - IP: 197.158.x.x - Internal IP: 192.168.x.x I understand ...
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101 views

How sharing location via web actually works? (It gets my exact house address)

I know that this could be a repeated question, but I'm freaked out right now, Maybe Im old or out of the 2015 technologies, but i just visited this page: http://whatismyipaddress.com. As I know, ...
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46 views

Link(s) between subnet mask, IP address and subnet ID [closed]

I am studying CompTIA Security+ material and am struggling to understand the link(s) between a subnet mask, an IPv4 address and a subnet ID. The question that I'm working on is as follows: Your ...
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1answer
119 views

Is Google intercepting my emails? [closed]

I was recently checking my Recent Activity under the "Details" tab inside my Gmail inbox, and I noticed this IP Address, it's not my IP: I proceeded to look up the IP and it's located in Mountain ...
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2answers
81 views

Malware / vulnerability that uses or causes malformed IP or TCP Headers

I'm curious if there are any examples of malformed IP or TCP headers (for example, checksums that don't match, reserved bits that aren't zero, or poor header length numbers) used by malware, or that ...
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64 views

Is someone reported a video to the fbi, would the IP address be traced? [closed]

Supposedly, if someone were to report a video to the fbi, if anyone watched that video, would their ip address be traced down?
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68 views

Web/search engine spider on local network?

I was setting up a test webserver on my local network earlier, and whilst sorting out the firewall I noticed the following in the log (/var/log/ufw.log - I'm using UFW on Ubuntu 14.04): Jul 9 ...
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Implications of IP Address as Subject Alt Name in certificates

Are there specific known negative security implications of including the IP address of a server as a Subject Alternate Name in the server's certificate?
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Mystery IP address Hijack

I'm working on a customer's new website. To get things up and running quickly, we're maintaining his domain name service and hosting the website on another server. Customer bought the URL name years ...
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What IP address is a new email account associated with? [closed]

If records are subpoenaed from google will they reveal internal IP or external IP addresses of a email account? For example if an email address is made and an email is sent using and iPad and home ...
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617 views

Can an attacker “simulate” a private IP address?

I have a SSH server with a rule that does not allow password connections outside the local network. So people already on the local network, either physically or via VPN, are allowed to connect with ...
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Ghost CMS abnormal access

I have a blog hosted with Ghost CMS. I created a new blog post (say "My New Blog") and correspondingly there was a url generated (mysite.com/mynewblog/) The weird part is that I saw an access to this ...
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Migration from TDM to All IP: any security issues?

My phone operator is slowly abandoning TDM (Time Division Multiplexing) to replace it with IP connections. What are the security risked related to this change? will all the phone line be like in a big ...
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1answer
65 views

How to handle a remote office and a client requiring IP Whitelisting?

.NET Developer here, out of my comfort zone on this one. My software company is going remote, where employees can work from home, Starbucks, a Regus office, Spain, anywhere really. One of our ...
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66 views

Is this a security flaw in tor? [duplicate]

I realize this question more belongs on the tor exchange (and i have indeed posted it there) so if you want to vote to close this question I completely understand. But I have noticed that this site it ...
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1answer
57 views

Risky Connection Blocked by McAfee

McAfee has been blocking a connection from a certain IP address (I found the IP Adress to be from Hong Kong). Should I be concerned? McAfee says the program is "SYSTEM". Also if I should be concerned ...
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Double/Chained VPN - Which IP will be vissible to the VPN providers?

I am currently using a company VPN and use Juniper Network Connect on OS X to connect to this network. I'm interested in using another VPN and set this up at my internet router at home, so all ...
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What are the risks associated with relying on Mutual SSL & IP Filtering?

We are thinking of implementing Mutual SSL combined with IP Filtering because we are unable to setup a vpn within our external client. What are the risks associated with using Mutual SSL combined with ...
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Faking IP address without being aware of returning response

I read different articles on the subject (Spoofing IP address), someone said: Spoofing an IP is usually better suited to "fire-an-forget" scenarios like DDoS. due to TCP two-way communication ...
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Does GRE Tunneling “really” hide your main IP?

As we all know, setting up a GRE Tunnel is nice to hide your main ip under a dedicated server. My question is, is it really hidden? Is there a way a malicious user could somehow find your main ip ...
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Is the method of hardening the creation of a Cryptographically Generated Address (CGA) called hash extension

CGAs are sha1 hashes truncated to a 59 bit value. Along with a 3 bit security parameter they form a IPv6 address (more precisely the interface identifier). from wikipedia: The Sec parameter ...
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Security implications of static IP? [duplicate]

I need a static IP for a remote shutdown utility with my phone. What are the security implications of setting IP to static? I feel the "attacker knows your IP won't change" argument may be a ...
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1answer
48 views

Does firewall count as a subnetwork? [closed]

I need to design a network based on IP 10.1.1.0/24. I have three different subnetworks and a firewall. Does firewall count as a subnetwork? Do I need to assign some IP values to it?
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Is someone able to hack my Facebook account knowing my Dynamic IP, PPPoE and mask?

I was using Facebook today and, after replying politely to someone about how stupid his comment on something was, Mr. John Doe, who I never met before, sent me this message: You wanna get hacked, ...
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1answer
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How does detecting promiscuous mode using an ARP test work?

I have read that we can detect whether a system is running promiscuous mode by sending out an ARP request with a fake broadcast address e.g FF:FF:FF:FF:FF:FE.This will be blocked by all NIC's ...
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56 views

MITM sniffing packets

I fail to understand how a MITM attack sniffs packets and modifies them.In the case of ARP spoofing although the attacker has spoofed the MAC address of a host, how does he modify it as the IP layer ...
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203 views

What is the importance of an ISP maintaining IP-Assignment logs?

I was reading an article which explained that there is a growing movement to force ISP's to store IP-assignment logs for DHCP connections for longer periods of time in order to fight cyber-crime. ...
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3answers
55 views

Utility to build IP exclusion list? [closed]

Are there any utilities out there that can assist in building an IP exclusion list? Scenario: Recently suffered a brute force attack where 50000 failed login attempts came from a multitude of ...
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Is it safe to publish some internal IP of my company?

Sometimes when asking networking questions on StackExchange I want to publish some output where several internal IP adresses from my company appear (output of traceroute command for example). Since I ...
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150 views

Rationale behind hiding originating IP address in emails?

Gmail has been hiding originating IP addresses for quite some time now. Hotmail and Yahoo have started doing this too. Apart from obvious privacy implications of revealing the sender's IP address, is ...
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How can I stop an IP from trying to use my mail server?

I have recently set up my first email server, and I look at the logs in /var/logs/mail.log to see what is happening, I notice this one IP does this multiple times every day for the last so many weeks ...
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How to hack into a remote mysql database?

(Moved from Stack Overflow as other users said it was a security question) I have a mysql database sitting on a remote server. Nothing else, ie no web site using it, no server side scripts etc, ...
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Security benefits to have IP-filter in HttpModule instead of Page-Load in asp.net pipeline?

I'm working on implementing an IP-filter which blocks all requests by machines outside our IP-range. This is for an asp.net project (written in c#). I've read on multiple forums that the safest way ...
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I have been accused of sending porn to my fiance's ex [closed]

I have not, but she says that she has my IP addres, which I know can be spoofed and also can be found out by my email header. What can I do to combat this liar? I have a hotmail account and she has a ...