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

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Assigning IP addresses to Docker containers via DHCP accordance with local segment

Here, I want to set the IP address on ubuntu images in accordance with the existing IP Segment in my local. I've configured the Ubuntu images with dockerfile, by installing mc, and openssh in the ...
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55 views

Varnish 4.x Unable to Pass Client IP

I'm currently using varnish to reduce the load on my server, however, because I want to be able to know what IP is being used regardless of my php $_SERVER request method for a visitors IP, I decided ...
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1answer
43 views

Use NGINX to whitelist IP for specific folder (aka example.com/administrator) [closed]

I am looking for a way to whitelist a specific set of IP addresses for a specific area of my website. For example, I would like to only allow xxx.xxx.xxx.xxx to access "example.com/admin", and deny ...
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26 views

IP range connected to my server suddenly times out

I've been leasing several /24 subnets from an external source and then I had my hosting company route them to my server. I've added the IPs using a network-script file ifcfg-eth0-range1 with contents ...
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55 views

Cisco 2960X & IPDT

I am interested in finding the IP addresses assigned to devices attached to each interface on a Cisco 2960X switch. It seems like IPDT is exactly what I'm looking for. However it seems like the ...
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2answers
159 views

VM migration and IP address

When a VM offering a service is migrated to a different server is it an important requirement from the client applications point of view to retain the same IP the VM had before ? For long lived TCP ...
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3answers
62 views

IPv6: Creating ranges, range values

So I've just been assigned a /64 IP address range. I'm using SolusVM to manage virtual machines. With the /64, I am given the first 4 (octets? I think they're called) so my format is currently XXXX:...
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43 views

Preventing IP wildcard address from binding to entire loopback range

Servers often use the IPv4 wildcard address 0.0.0.0 to bind to all interfaces, one of these being the loopback interface (127.0.0.0/8). On Windows, is it possible to prevent binding to the entire ...
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2answers
72 views

Using real IP on the server

We have dedicated internet connection an our ISP has provided us with some real IP addresses. We have several servers which we use, including a one that has a real IP on it as they enter to the ...
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1answer
37 views

Deny all kind of access except for ip-range

Hi I'm setting up a little 2012R2 network. Right now I want to setup an DC and connect a few windows machines with it. It's running virtualisied on my root server and unfortunatly I can't put it ...
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1answer
117 views

ARP Request Being Sent To Different Subnet From Ubuntu Linux

This question is very similar to this one: Linux is sending ARP requests to hosts in other subnets? Main problem - Ubuntu Linux server is sending ARP requests asking for a MAC address of a host on a ...
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40 views

Ubuntu - Destination Host Unreachable Through Router / ARP Requests

Very strange issues on an Ubuntu server running DNS. Here is the network setup. There are two class C network ranges. Let's say they are: 216.107.249.0/24 216.107.250.0/24 Server is assigned an ...
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10 views

debug connection to other server

My server suddently is unable to connect to other servers through Curl, file_get_contents etc. This issue is reported for at least 5 different server Ips. Whereas it still works with many others. ...
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1answer
65 views

Static routing is redirecting

I have one PC with 192.168.x.135 as IP and 192.168.x.33 as gateway; and a Windows Server 2008 with the IP 192.168.x.33. Now I want to route all packages with the destination 14.x.x.x to 127.x.x.x. So ...
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2answers
81 views

Tracert not resolving IP

I know this is propably a basic question, i did some research on the net as to the whys and hows and got only more confused. I wanted to ask why tracert returns this : Tracing route to youtube.com [...
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1answer
74 views

IP configuration of cluster application to database server

I need to setup the IP of a cluster of applications servers to connect to a cluster of database servers. For 1 to 1, application server to database server is quite easy, but when comes to a cluster ...
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1answer
32 views

Priority of dhcp servers

Let say there is a main Server which is assigning ips by dhcp to 50 different LAN ports in network.Now if at some LAN port we connect a small router on the yellow port(so that all other devices come ...
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24 views

How do you write the following command : if (netstat flag ==UG ) save addres IP [closed]

how How do you write the following command in ubuntu : if (netstat flag ==UG ) thene addres ip > new file I want to file contains : addres ip 152.123.12.1 123.12.12.123 ....
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26 views

Redirect external ip of server to external ip of virtual machine

I have a server with multiple virtual machines. Let's say this is my server ips: Internal 1.2.3.4 External 5.6.7.8 Now, if i go to 1.2.3.4:8082 it goes to my app (I redirect :8082 to de internal ip ...
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1answer
38 views

Where to enter these network configuration [closed]

I have a dedicated server which I want to install CentOS 6.6 on. The problem is: The service provider gives me these: Network: xxx.xxx.xxx.xxx/xx Gateway: xxx.xxx.xxx.xxx Server: xxx.xxx.xxx.xxx ...
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1answer
233 views

What Does “ping -f” Do In The OS X Terminal? [closed]

I've recently read about the command in the OS X terminal, "ping -f (Target IP)". I haven't been able to form an understanding on the command even after looking through numerous online articles. I ...
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2answers
84 views

How does ifconfig calculate packet loss?

Does the dropped packets output of ifconfig refer to the number of frames lost on the local subnet (i.e. datalink layer) or the number of lost IP datagrams at the IP layer or is it TCP retransmission ...
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2answers
138 views

How to isolate networks when subnetting? [duplicate]

I'm currently learning about IPv4 and subnetting. As far as I understand, if we want to create 4 small isolated networks with the size 50, we can use subnetting. If we subnet a Class-C IPv4 network(...
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25 views

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
207 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
96 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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45 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
47 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
90 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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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
6k 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
392 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
640 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
89 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 now:...
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2answers
683 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
72 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 (www....
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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
97 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 Instance,...
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1answer
81 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 ...
3
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1answer
265 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
125 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
82 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
155 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
221 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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66 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 ...