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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CIPSO & CALIPSO implementation

Trying to understand how to implement security labels into IP packets. There is minimal documentation. Can anyone assist on how one can do this? Do you need raw sockets, or is there an API that UDP ...
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43 views

Can we send IP request to a user by knowing their mobile number?

i.e request/alert for a user in my contact list with the help of data services of service provider and Is there any chance of getting an acknowledgement from the specified user using the data ...
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VPN chain in one machine without VM natively

Is it any way to make VPN chain in one machine (MAC or WIN) without VM natively (L2TP/IPsec)? I need this for obtain an extra layer of security. For example - if one VPN turns off I still have ...
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2answers
64 views

IP leakage on Skype through VPN

Does anyone know how the traffic behaves if you configure a VPN natively through SSTP (WIN or MAC)? Because most applications use the TCP, but Skype uses UDP. I try to formulate more specific ...
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1answer
109 views

Is it safe to be showing my WAN and LAN IPs in my email headers?

I don't know how to hide my LAN IP from my email recipients. My LAN IP shows up next to my WAN IP in my outgoing email headers (sent to my other accounts and viewed by me). I have not seen emails sent ...
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2answers
152 views

Kali Linux/Metasploit in VirtualBox - Issue with ports

I've been attempting to get port 4444 to open these past couple of days. I finally figured I'd try to get it working on my Windows machine first and I finally got it. Now, no matter what I do in the ...
206
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15answers
9k views

Tracing the location of a mobile IP from an email

I'm a TV scriptwriter - and not hugely tech-savvy, so please bear with me... If the police have an email, sent by a suspect over a 3G or 4G network, could they use the IP address (since they know ...
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1answer
113 views

ip address hack [closed]

I believe someone knows my IP through accessing public WiFi and accounts such as BT sport. Now I know I'm being monitored but not sure how. I believe this person is a hacker and that they know the ...
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3answers
5k views

How does IP address spoofing on the Internet work? Who can do it?

Someone recently told me that the NSA could impersonate pretty much anyone they want by using IP address spoofing on the Internet. But how would that work and to what extend is it true anyway? Could ...
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0answers
11 views

Why is the maximum port range 65535 in the TCP/IP Suite ? [migrated]

My doubt is that - a port is just logical, so why such restriction ? Why can't I have a port of 9924593 or something like that ?
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1answer
51 views

What prevents ISPs from tracking chain of proxies' (or Tor relays') IP addresses?

I searched all over the internet for the answer for my simple question, but couldn't find anything useful. I already know that police have to access PCs used as proxies or Tor relay nodes to read ...
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2answers
68 views

Security implications of WAF revealing internal IP addresses

What are the security implications of a web app firewall/load balancer revealing internal IPs of the web sites behind it to the outside world? A specific example is with F5 products: They use a ...
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1answer
56 views

Is it a good practice to forbid ip access to port 80?

I see some sites have blocked there port 80 (or 443) to be accessed by IP. When you access by IP, An Nginx forbidden page shows up (with there OS version). My question is does it affect any side of ...
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7answers
706 views

Does Windows 10 leak information about your IP address?

There are various reports of Windows 10 automatically sending out data when the user opens the start menu. Can that information or other information that Windows 10 automatically sends out to the ...
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1answer
33 views

Why is calculating the checksum of an IP Datagram header and then encrypting it not appropriate to provide Data Origin Authentication?

So assuming Alice and Bob have agreed to use a particular symmetric cryptosystem and share an appropriate key, they want to achieve data origin authentication by computing the header checksum of an IP ...
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2answers
54 views

AS number look up [closed]

I have a list of thousands of urls, for each host in these URLs I want to get their AS "Autonomous System" number. What is the best way to do that automatically? I have seen some websites that ...
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1answer
35 views

Multiple users sharing the same IP

I'm setting up a quite unusual proxy for a very specific niche case. I'm allocating (ip,port) addresses to users, from which they can send and receive UDP and TCP packets. e.g. say someone is ...
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4answers
260 views

How to design a home network for IoT devices?

I'm trying to work out how best to design a home network which contains (potentially hostile) devices. I'm running into my limits of networking knowledge! I have two challenges. Unsecure Devices ...
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2answers
305 views

Sophisticated DDOS attack

According to this article, ProtonMail was the victim of a very sophisticated DDOS attack. "At 2pm there was a dramatic escalation," said Yen. According to Yen and Gargula the attackers smacked 15 ...
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1answer
58 views

Can an ip be forced to connect? If so, how is it done, and how can I prevent it? [closed]

Can an IP be forced to receive data from another IP (specifically IPv6 for both)? If so how does this work, and how can I prevent this from happening to me? Does that have any way to be broken? If so ...
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0answers
29 views

What are the security risks of using public address schemes for the DHCP of your VPN'd Users?

At the company I work for we recently purchased a network scanning tool to help with asset inventory and overall PC network management. My supervisor, while looking at the different IP address ranges ...
3
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1answer
46 views

Does using the same mail and web server increase a risk of DDos due to IP exposure?

I use the same server for sending my emails and web hosting. I send user registration and support forum mails from my server and occasional marketing mails or newsletters. I read on a CloudFlare blog ...
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4answers
122 views

Is it possible to fake incoming IP?

I would like to whitelist an IP address on my smtp server so that non-authenticated emails on connections originating from that IP could be routed. I control that other IP, so I can make sure that ...
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2answers
98 views

Exposing IP address via img tags

As we all know, many forums allow users to set profile pictures, post images, or put images in signatures. Could a user create an img tag that points to their own site with a link that no one would ...
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1answer
48 views

Can the ip of a SMB file share be traced back to me? [closed]

The question is pretty much self explanitory
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1answer
209 views

T-Mobile WWAN IP address is DoD Network Information Center? [closed]

I wrote an app that grabs the IP address of my Wifi as well as the WWAN i.e. the data part of my Tmobile plan. I have an iPhone. Here is what my app prints. I use pretty standard code to obtain the ...
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Moving Target Defense implementation in context of SDN

I need to demonstrate MTD for a project in context of SDN by writing logic for the SDN controller. The logic could be as simple as creating a new Virtual IP every n seconds. However, i would like some ...
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2answers
81 views

public databases of IP addresses which are involved in illegal/gray-area activities

I just received a /24 IPv4 network from my ISP. This very same /24 network was previously used by some hosting provider and if I made a quick scan of those 256 IPv4 addresses agains some DNSBL ...
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1answer
65 views

Is it possible to Use someone public IP? [closed]

I am quite aware of the networking. But I have a confusion which I am searching over internet but did not come to any solution. Can we assign any specific IP to our PC or any device. Like I want to ...
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2answers
110 views

Why did I get a wrong IP and certificate for www.facebook.com just now? [closed]

I just navigated to www.facebook.com and my browser alerted me that an invalid certificate has been received. I checked the cert in question, and I was surprised to see that the Common Name on it was ...
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2answers
140 views

Malicious user inflicting XSS attacks appears to be on my own network

I have a live Django project where I'm using nginx as a reverse proxy with gunicorn as the application server. It's a fairly new project and isn't SSL enabled yet. There's a user on this project who's ...
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1answer
119 views

How restrict is an Asp .Net Web App with ipSecurity enabled?

The IT department of my company refused to host an ASP .Net Web App on our intranet. For security reasons that would be the best solution. Right now I'm considering other options. One of those is to ...
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4answers
324 views

How to identify a company's public network address range?

Which tools or websites can I use to identify a company's public network address range(s)?
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1answer
87 views

How does add-on for the Firefox with a custom proxy server prevents info from Google?

I would like to know how does add-on for the Firefox web browser with a custom proxy server prevent Google from collecting information about your browsing? Does it prevent also from your internet ...
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1answer
112 views

The problem I have with wikipedia showing IP addresses to the world? [closed]

I went on wikipedia, then went to the edit history of an articles I edited. To my surprise, my IP address, along with other people's IP addresses are on the articles edit history page. Why would ...
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10answers
12k views

While working from home, is it a bad idea to give the company you work for your IP address?

I work from home. Why would a company I am about to do some work for ask for my IP address? What would they need it for? Should I be worried? Thanks
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1answer
123 views

Linux responds to ARP requests for other interfaces - could this be a security vulnerability?

Linux responds to ARP requests on all interfaces by default. To explain, say you have this setup: Client 1 ---> [eth1] server [eth0] <--- Client 2 And the server's eth1 IP is 192.168.1.1 and ...
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3answers
264 views

How can I find an unauthorized/unknown proxy on my home network?

I recently started receiving an error while trying to stream netflix that I'm using a proxy. Exactly this error code here: https://help.netflix.com/en/node/277?ba=GSButtonClick&q= My problem is ...
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1answer
39 views

IPSec Host-to-Host VPN (RedHat) needs IP Forwarding?

We would like to build a Host-to-Host IPSec VPN (both RedHat Linux). Is it really mandatory to activate IP Forwarding, which is by default deactivated because of our security policy (/etc/sysctl.conf ...
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3answers
286 views

How to (further) ensure SSH security?

I set up my Linux Ubuntu machine as an SSH server through no-ip.com and it works great. Recently I discovered the command, sudo lastb -ad -F -w which outputs a log of the most recent failed SSH ...
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152 views

Beginner > Medium > Advanced Books/Guides/Tutorials on TCP/IP [closed]

Long time web developer looking to get into infosec. Was hoping on guidance on material from a beginners stance on TCP/IP and hopefully "networks". I realise the massive generalisation I'm making but ...
3
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1answer
72 views

What other attacks can be deployed using IP spoofing other than DoS(and DDoS) attacks ?

I want to know the other attacks which are associated with IP spoofing because, we're trying to implement Source Address Validation (SAVA) and wanted to where else can Source Address validation ...
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1answer
74 views

IP Address Is A Guid-Like String [closed]

When I get my IP address from Google, in most cases, it's a number like NNN.NNN.NNN.NNN (sometimes fewer than 3 Ns). It always is in that format. I noticed on this new wifi that my IP address is a ...
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2answers
237 views

How was The Pirate Bay datacenter kept hidden?

How were The Pirate Bay's servers kept hidden for so long? You would think that it would be easy finding the servers that so many DNS servers are pointing to. Tracing the chain to the main datacenter ...
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2answers
424 views

Port forwarding with 0.0.0.0, any threat?

I set up on our company's firewall (fortigate100d) a port forwarding to one of our Internal services. As we don't have a static public IP I used 0.0.0.0 as an external IP so the remote users can ...
11
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1answer
729 views

How can I detect real location of the user through their IP address?

There were many ways to detect the user's IP, for instance we could get it through a single click link or through any other medium of communication where we could get the user's IP. But the tedious ...
5
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1answer
98 views

Using a single number instead of an IP address or a DNS name, which are concrete uses? [closed]

My question: I have read that using the single number equivalent (called the "binary equivalent" by the author) of the IP address instead of the actual IP address or the domain name can be used "to ...
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1answer
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Little bit confusing with nmap scan

I started MySQL with this command service mysql start and it worked pretty well. So: Using the netstat command, I found 127.0.0.1:3306 was in listening state, this is the MySQL service. So I did a ...
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Are there any statistics about packet filtering to prevent IP spoofing on the internet?

DDoS attacks via spoofed DNS(sec) are daily news for the last few years, but packet filtering should prevent IP spoofing on the internet. I tried (as an exercise) to spoof a packet on my VPS and on ...
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2answers
332 views

Should i use peer block to better secure my computer?

Should i be using peer block to secure my computer or is there a better way to accomplish the same task? I dont file share, my curiosity of peer block came from my research of security of my ...