Top "Ip" questions

This tag is for questions related to the Internet Protocol.

Why are ports below 1024 privileged?

I've heard it's meant to be a security feature, but it often seems like a security problem. If I want …

unix ip port
What does "192.168.1.1/21" mean?

When they write a slash followed by a number after an IP address, what does that mean?

networking network-programming ip
Parsing IPv6 extension headers containing unknown extensions

I'm writing a very simple net filter, and getting to where I want to parse IPv6 headers to match things …

networking ip ipv6
Are we using TCP/IP or OSI in internet?

sorry for that question, but i've searched about that topic, and it's not really clear, they say that internet uses …

tcp ip osi
Can I use broadcast or multicast for TCP?

For Internet Protocol (IP) I can use multicast: in IPv4: Internet Group Management Protocol (IGMP) in IPv6: Multicast Listener Discovery …

tcp udp ip broadcast multicast
Only allow certain IP addresses to access site with mod_rewrite?

We have a directory on our site which we only want to be accessible by a couple of IP addresses. …

redirect mod-rewrite ip block whitelist
Request.UserHostAddress issue with return result "::1"

I am trying to get client ip address using HttpContext.Request.UserHostAddress; but it returns ::1. How to solve this?

c# asp.net-mvc ip httpcontext
ONVIF : How to form the device web service address from the IP address of an NVT

My question is about the ONVIF specification. http://www.onvif.org/imwp/download.asp?ContentID=18006 In section 5.10, it says : A …

camera video-streaming ip specifications onvif
select outgoing ip for curl request

I have a server with two different IPs. I need to send odd curl requests from first IP, and even …

php curl ip
What is the difference between a physical address and MAC address in networking?

Somewhere I have read that both physical address and MAC address are the same,which is exactly the same attached …

networking ip mac-address