IP - Internet Protocol, the most commonly-used set of rules for dispatching data across a large computer network.

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Support for Broadcast

I'm working on a research paper that may rely heavily on broadcasting. I've written a small prototype application to test broadcasting in a university setting, and everything works as expected. I've ...
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3answers
197 views

Can I use a Ubuntu computer to connect to two IDENTICAL WiFi AP? [closed]

I encounter a problem when I'm trying to use a Ubuntu laptop computer to connect to two identical WiFi AP in the same time. On that laptop there are two WiFi NICs, one is embedded (say, Wifi-A) and ...
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2answers
94 views

Any protocol used by TRACEROUTE ? ICMP or UDP [closed]

Any protocol used by TRACEROUTE : ICMP or UDP or IP ? Or use them all : Encapsulation ?
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3answers
67 views

Are there still benefits to use more than one IP address for all server services?

I have one IP address for my nameserver, my web server, mail server, ftp server. I use SNI SSL so that my hosted websites have different SSL certificates behind one IP. I use a centralized firewall to ...
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42 views

What is the 'group default' part in my ip link output?

I've got two servers deployed on AWS. I've got trouble connecting to one from Linux and strangely not from OS X. What I meant by connecting is large: opening an ssh connection or getting the content ...
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1answer
44 views

Is IP Anycast helpful for fast loading website? [duplicate]

I'm not sure but before I purchase http://dnsmadeeasy.com IP anyast service I really need to know What is IP Anycast actually and how does this work? Can anyone explain in simple sense?
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1answer
82 views

How to set ip addresses given up by my ISP

My ISP gave me 6 host IP ex 124.16.59.240/29 this belongs to the same subnet. And they gave me another set of IP addresses that belong to different subnet ex-124.16.63.145/30 it has 2 host IP of ...
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1answer
39 views

Extending IP-range

We have a problem with our IP-range. For the moment it is 10.0.0.1 to 10.0.0.254. Unfortunately it isn't enough anymore. So we wanted to setup a whole new scope on our DHCP server 2008. We want to ...
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1answer
32 views

Firewall Security Issue

I'm running a few servers off Windows Server 2008, although I have some problems with client connections. To troubleshoot the issue I have clients ping an IP that is behind a router, and they are able ...
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3answers
5k views

When to use routable vs non-routable IP addresses [closed]

As I understand it, there are several "non-routable" IP ranges: class A reserved space 10.0.0.0/8 class B reserved space 172.16.0.0/12 class C reserved space 192.168.0.0/16 class E reserved for ...
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1answer
41 views

How to made local network in VMWare ESXi 5.5? [closed]

I want to make alternative for mikrotik or cerio routers for ESXi. I need to setup virtual machine with debian and configure iptables. It will work like router. And i need to made local network in ...
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2answers
351 views

Can't use external IP on Hetzner VPS

I've changed my virtual server model on Hetzner recently. The new one has an external IPv4 address on which it's accessible from the internet (as it should). But I can't use this external IP in ...
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2answers
507 views

Apache 2.4 restrict URL to certain IPs

I am trying to restrict a specific URL to be available outside the network only to specific IP addresses. When a user outside tries to access that URL and not from the list of IPs he should be ...
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1answer
88 views

IP Switch between 2 domain controllers

I have several domain controllers in my domain and I need to switch the IP between 2 of them ( one with Windows Server 2k8 R2 and one with Windows Server 2k12 R2 ) I did the following steps until ...
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2answers
589 views

Remote access Mikrotik with no public IP

I have a Mikrotik behind a broadband router, I want to access the Mikrotik using web or winbox but the problems are; 1- Mikrotik could access internet but has no public IP 2- Using VPN is forbidden ...
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1answer
70 views

A record or cname

I have a server (Ubuntu + Apache) where we host an app where clients can create their own subdomains - i.e. basically wildcard subdomains. We have a client that wants to point their own domain ...
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1answer
50 views

Iptables won't redirect

I'm trying to redirect all tcp traffic on port 102 from a single ip address to another ip address and want to masquerade the ip as well im using this iptable config, but still i cannot connect. ...
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18 views

Exchange account access blocked by phantom mobile device

I am not able to log into my workplace Exchange account because there is a mobile device accessing my home IP address; this is blocking my Exchange account log in. How can I determine what specific ...
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1answer
92 views

Find IP blocks for a hosting provider

Is there anyway to pick a hosting provider and get all IP addresses which they have assigned to them? I've tried the RIPE database but a) it only returns 250 results and b) it includes entries which ...
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1answer
51 views

Amazon AWS EC2 - Two IP´s for private and public access

I need a different IP for my database/ssh access to the public IP address my users know for a better security. For my understanding, it´s only possible to bind a single Elastic IP to one EC2 ...
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1answer
79 views

What will happen in a network if multiple devices have the same MAC address? [closed]

What will happen in something like a wifi connection where different laptops are set with the same MAC address . To make it more interesting what will happen if there are multiple devices with same ...
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1answer
253 views

IPTABLES Redirect a port to another IP

I have tried several post to configure this redirect but is not working, this is what I need I am receiving packets on port 8080 and I want to redirect the packets to another IP in the same server, ...
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1answer
114 views

Can browse to http://localhost/ but can't by IP nor by organization computer name

I'm using windows server 2012, When opening browser, and placing localhost in the URL, i'm able to navigate to the IIS welcome screen successfully. But, if I use the IP or the computer name, I'm ...
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2answers
81 views

Difference between connecting from inside and outside a subnet [closed]

Let's say provider granted me IP addresses 10.20.30.1 - 10.20.30.254, so the subnet address is 10.20.30.0 and mask 255.255.255.0. I set my router to 10.20.30.1 and computers to 10.20.30.2 and higher. ...
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1answer
136 views

How to prevent users from scanning the network

in my network many peoples spoof mac address, they get mac adresses of online users by scanning the network or the ip address range and using wireshark they get easily any mac address so how to ...
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2answers
189 views

Set up 4 ip addresses with Subnet mask 255.255.255.252 (30)

i bought 4 ip addresses on OVH. Then they gave me this details: 84.84.184.176/30 Network IP: 84.84.184.176 Broadcast IP: 84.84.184.179 Gateway IP: 84.84.184.178 Netmask: 255.255.255.252 And they ...
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64 views

How to implement 1:1 (mapping)NAT like aws does mapping public IP to private IP

I have a machine in private network having it's private IP (lets say 192.168.1.8). I have one server somewhere having public ip (lets say 1.2.1.2) I would like to map this public IP to my private IP ...
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2answers
43 views

Industry standard SLA for API Gateway static IP change notification?

Assume a "public" API Gateway having a single domain name (ex. api.mybigcompany.com) and a set of 8 static IP addresses assigned to an "East" hosting facility to load balance that domain. A subset of ...
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1answer
137 views

My Website Loads Really Slow Using Domain Name, But Fast Using IP

Only fixed line ISP is affected. Others OK. Anyone knows where to start to detect the problem?. DNS Checked using DIG TRACERT NSLOOKUP WHOIS all OK. is there anything i need to check at my hosting ...
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1answer
33 views

Using IPs for websites also for their name servers [closed]

My new web hosting company (managed VPS) suggests I use the two IPs assigned to my websites as the name servers for those same sites. (One IP is dedicated to one site, the other IP will be shared ...
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1answer
546 views

Some visitors cannot access my website

I am receiving some reports from different clients in Spain, US and France that they cannot access my website, https://www.ultreyatours.com. They get a ERR_NAME_NOT_RESOLVED error saying the server ...
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3answers
143 views

Peer to peer communication in complicated multi-subnets LAN

We are developing a P2P application and stucked at the part of making communication between 2 peers which are in same local LAN but 2 different subnets. We know that there are a lot of cases that 2 ...
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58 views

IP design for medium sized network

I have been reading a lot to refresh my memory of ip design set up. It's been years I have to go back to this because I have only had to support a small network and am very similar with setting up ...
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38 views

Two ips rotating each time an email is sent - iptables

I have two ips attempting to rotate each time an email is sent from server. The following commands say they are configured: sudo ifup venet0:0 ifup: interface venet0:0 already configured sudo ifup ...
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2answers
913 views

VPN access to LAN over internet, same device IP on Local and Remote network [closed]

I successfully configured a VPN connection to my Home network over internet following this guide. The current configurations is: Home Network (Remote) LAN: 192.168.1.1 => Router/Modem ...
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43 views

Heroku, Github Pages, and GoDaddy — Answer & Explanation Requested

I'm in a bit of an interesting situation. I have two sites that I have deployed in the last two days. The first is my personal website. I have a custom domain name for my site that is linked to my ...
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77 views

2 IP cameras with same configuration but different behaviour

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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2answers
138 views

NOIP Static IP address resetting with router [closed]

I need a static IP address to access a client's website, which has a list of whitelisted IPs but rejects all others. This is great, except I have a Dynamic IP address and a Talk Talk router. I ...
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1answer
31 views

Virtual hosts instead of separate IPs?

I've been wondering if it's possible to host multiple applications using a single port on one IP address. I'm meaning a similar method to Apache Virtual Hosts where you can assign domains/subdomains ...
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76 views

Samba shares don't work when mounted via host names from /etc/hosts

I have /etc/hosts file with this line 10.1.17.123 SAMBAWINSERVER I am trying to mount samba shares referencing server by name in the hosts file. I tried to mount it via regular mount command or ...
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1answer
100 views

Can't Bind IP Address To Machine [closed]

I have the following IPs but I can't bind them to my machine I am getting errors. Here are the IPs I own. 2607:5300:60:1234::/64 - Came with server 158.69.123.123/29 - ...
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93 views

Cisco ASA 5505 access external IP address from internal

Got a bit of a head scratcher. ASA Version: 8.3(1) ASDM Version: 6.3(1) So I have an ASA 5505 with 3 interfaces (Inside, outside and Hosting). The inside interface has the IP range of 10.0.0.X and ...
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1answer
126 views

ASA Site-to-Site VPN Failure

We have a series of remote sites connecting to our main site using site-to-site VPN over Cisco 5505s. Every remote site works fine, except one. What is unique about the failing one is that its IP ...
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1answer
63 views

Server abandons set static ip and returns to dhcp given address

I have a few virtualized (ubuntu 14.04 LTS) servers under KVM that I'm trying to move to an ip block other than the one reserved for servers under dhcp (the 10.10.2.0/24 block). I change the ip and ...
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1answer
144 views

How can I access a URL through it's IP address? [closed]

http://example.com has the IP address 93.184.216.34. From what I've read about IP addreses and ports, this leads me to believe that appending the port 80 to the end of it (93.184.216.34:80) should ...
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1answer
64 views

Connecting two clients openvpn

I have two clients one connected to vpn server through vpn and another without vpn. I can ping both the clients from my server but I can't do directly using one client to another. I am adding route ...
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53 views

Mutual Authentication - Allow from IP range without client certificate

Is it possible to set SSLVerifyClient: Require but, also allow IP range for users who do not have the client cert? Possibly to use: Order deny,allow Deny from all Allow from xxx.xxx.xxx.xxx ...
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2answers
2k views

In the output of `last`, what does suffix “.d” after an IP address mean?

In order to find out who was logged in recently on my server I am using the command: There were logins from very strange IP addresses e.g.: username@pc:/home/user$ last username pts/16 ...
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How does NAT work with more than 2^16 devices? [duplicate]

According to this article, NAT keeps track of which devices to route responses to by specifying a response port that it listens on. For example, when I make a request from a NATted computer, my router ...
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2answers
142 views

Can I access a NAT addressed host behind a gateway from the WAN side without DNS or VPN (with DNS if it's not possible)?

I have a very simple gateway running a minimal Linux which is serving as an IP router with NAT and DHCP on the LAN, and a static IP on the WAN. The gateway router from the LAN side goes to a big ...