Newest ip Questions

Q&A for system and network administrators

Running Multiple Servers behind pfsense using single IP

I have two webservers sitting behind a pfsense router. My ISP has issued me with a public IP. I have a LAN and OPT1 interface in pfsense. Is it possible to host these two webservers behind the single ...

How is it possible that the same IP is shared between different domains?

I have a web service used by some websites. In my log file I found that there is 5 websites (different domains) who send post requests to my web service with the same IP address. How is it possible ? ...

Cisco Routers and ACL with minimal interruption

I have a Cisco 1921 router in which I have configured the following access control list: EDIT access-list 199 deny 192.168.1.24 access-list 199 permit any any I want the ability to remove and ...

Ping goes through shortest prefix

The setup I have a GW with an ipsec tunnel with a range of addresses 172.17.x.x on the other side, which is mounted on top of interface ens3. The GW is connected to a subnet with prefix 172.17.3.x (...

Configure multiple ip on same vlan on centos 7 machine

My existing network file looks like below # cat ifcfg-ens1.200 DEVICE=ens1.200 BOOTPROTO=static ONBOOT=yes IPADDR=172.16.2.10 NETMASK=255.255.255.0 USERCTL=no NETWORK=172.16.2.0 VLAN=yes How to ...

SRV record to serve a webpage at a specific IP/Port

I have a website "mydomain.ca" And I have a web management front end hosted at different IP, port 1234 I'm trying to get a SRV record to work so that whenever I go to subsite.mydomain.ca it will ...

Set IP address for virtual network interface

I have virtual interface tun0 connected to my vpn provider. I used the following commands to set it up with openvpn (route_up.sh): #!/bin/sh ip route add default via $route_vpn_gateway dev $dev table ...

How does IP range work in range notation? [duplicate]

when they write the ip address in this format 170.83.440.0/20 does it mean: 170.83.440.0 170.83.440.1 170.83.440.2 170.83.440.3 170.83.440.x or does it mean 170.20.x.x to 170.83.440.0 ?

Is it possible to have a non-all-ones broadcast address?

We've been developing some scripts recently for auto-setting IP address details on our embedded devices. The method involved setting both the IP address details (e.g., 192.0.0.100/24 and the ...

Can domain records exist in multiple registrars?

I have a client that wants to maintain control of his domain (fair enough) - he also wants to maintain control of his MX records (fair enough). He is with CrazyDomains and the current records kind ...

How to block a small IP range in csf

I'm looking for a way to block a small ip range in csf, e.g. 151.80.31.103 to 151.80.31.115 I know how to block each ip by issuing a cmmand csf -d IP, but it is a lot more effective to have a way to ...

How to access the same IP using different network interfaces [migrated]

I have three wlan interfaces attached in my RaspberryPi: wlan0 wlan1 wlan2 Each of them is connected to the different SSID: gopro-0 gopro-1 gopro-2 GoPro cameras are set as a WiFi router, have ...

How do I “share/route/tunnel” an ip addres from physical host A to B?

I don't know exactly how a SDN implementation would help my situation, but maybe somebody can clarify: I have physical hosts A and B. Host A has 5 ipv4 addresses routed to it and host B has one. I ...

EIGRP vs OSPF for internal routing

What's the difference bewteen EIGRP and OSPF for internal routing ? I know that EIGRP can only be deployed on CISCO equipement, but what's the point of using it instead of OSPF on a heterogenous ...

Use DNS or similar to re-route URL shortener service when dedicated server is down [closed]

I am trying to make a link shortener resilient to server failure by re-routing to a good server. Example: shortener.com/a1b2c3 > forwards to > website1.com (shortener.com and website1.com are on ...

OpenVPN applying fixed client IP addresses

Using OpenVPN with a pool of clients works perfectly and I see a line from netstat -rn that, as expected, looks like this: 172.22.0.0 255.255.128.0 10.8.0.1 10.8.0.100 291 and ...

Are IPs assinged by APIPA static?

I have two virtual machines that are on the same network via VirtualBox. There is no DHCP server and their IPs are assinged by the APIPA automatically. I'm wondering are those IP static, in a way that ...

Editing Cisco Router Extended ACL lists

I have a Cisco 1921 router where I am using outbound extended access list. Whenever I edit my access lists, it results in losing all IP traffic. I will have about 3 deny statements, and then end with ...

How to calculate the subnet mask for 310 subnets [duplicate]

So we have one task which is to calculate the subnet mask for 310 subnets. The IP of the company is 102.0.0.0. I think the right approach would be to solve this equation 310 < 2^x which gives me ...

Changed network connection for Windows server running on Google Cloud and can't connect

So I changed the IP for my windows server 2012 running on Google Cloud Platform in network sharing center and "tab" the subnet mask which was 255.0.0.0 and I got disconnected from the server and I can'...

AWS for Magento: what should I set “remote access CIDR”

I am trying to set up Magento on AWS and I am using a their guide (and CloudFormation) here: http://docs.aws.amazon.com/quickstart/latest/magento/step3a.html They are asking for a value for ...

DHCP server is not selecting IPs inside of the specified range

I have my DHCP server which I specificaly set the ip range to be between: 10.53.70.100 -- 10.53.70.200 but there are sometimes I get IPs outside from this range. For example, the last server I created ...

Connect a computer through VPN with a different network

Hi, I would like to connect to a computer through a vpn in another network. My computer (Debian 7.11) is in the network 192.168.2.0/24. My gateway (192.168.2.1) is a VPN router. It connects to ...

GCE Protocol Forwarding, use IP for outgoing requests

I have a GCE instance that has multiple protocol-forwarding rules to it. All the forwards work prefectly, but when the instance creates a request from itself to the internet, how do I specify which ...

Change scale set virtual network default address 10.0.0.0/16

By default, when creating a scale set through the Azure Portal, that scale set has a a virtual Network with the default address 10.0.0.0/16, even if you are already using that Network for other ...

How to map a hostname to IP with custom logic?

I need to resolve hostnames with the next logic: r0z0n0 10.0.0.0 r10z15n120 10.10.15.120 r255z255n255 10.255.255.255 and so on. I don't want to have 16,581,375 records. It is better to use a ...

Apache access from Tor

I have an application running on Apache on CentOS. It has internet facing IP address. I want it to accept only anonymous connections from Tor browser. How to do this?

How can i use port forwarding to multi ip

I have two IPs (public IPs) eth0: 1.1.1.1 and eth0:1: 2.2.2.2 I'm using portforwarding. ssh -D 1080 root@2.2.2.2 But when i go to check ip site (ip2location) then my ip is: 1.1.1.1 I want to use: ...

How to simply Reroute an IP to another?

Basically, here is my need : Being able to specify an IP address in the DNS Zones of my 60+ domains, and have the ability to redirect this IP to another one (and change it when needed). I'm not the ...

Two adapters communicating on same subnet

I have two sensors that each provide approximately 1Gbps of data and have static IPs on the same subnet. I have one PC with two 1xGbps adapters that I am using for processing the incoming data (OS is ...

Mobile ip assignement using NAT are location dependent?

This post explains very well the logic behind ip assignation for mobile devices but as far as I understand 1 IP can be assigned to various smartphones by the ISP using NAT. I would like to know if ...

Alpine on Linode looses it's IP after reboot

I am trying to install an alpine server on a linode computer. Here is a tutorial from linode to show how to install alpine on their hosts, I've done that so often, that I wrote a script which ...

Networking Issue with DHCP and Vlans

We've had this issue for a while now and im at my whits end. Bit of background, we have a simple setup, we have a main vlan for the office, then a few seperate ones for development, testing and ...

Router's IP and devices external IP are different

Is that normal if my router's IP address and external IP that my devices shows me are different? What does that mean? laptop screeshot router screeshot

Centos7 disable IP Redirect sending on IPSec VPN Server

When using StrongSwan as an IPSEC S2S VPN Gateway, ICMP redirects are being sent to machines behind the right side. I have added the following lines to /etc/sysctl.conf: net.ipv4.conf.all....

How to configure DNS Zone to use a different IP as Email server?

I used to have my web and email services on the same machine, on the same IP address, so my DNS Zone was relatively simple. Now, I am setting-up 2 separate machines, for Web server, and for Email ...

How to mark packets depending on hostname?

We can mark packets on the basis of IP addresses in the following way - iptables -A FORWARD -t mangle -s 123.2.3.4 -j MARK --set-mark 1 How to mark packets depending on the hostname? I tried this - ...

HA configuration on Compute Engine

Is it possible to have something like this using compute engine? In my case I would like to have an external IP address as a service IP so this IP can be configured in any compute engine VM. Is it ...

Server Connection Error : IP adress is not available

I use a web app deployed on an apache-like proprietary server to create my building automation system. I match ip settings of server and network interface. But it gives such an error : error And ...

One particular dedicated server can't ping one particular IP on on a VM and vice versa

I've 3 dedicated servers. 2 of them are running multiple VMs. VMs are all using multiple IPs from different countries. When the other dedicated tries to contact a particular VM using one ip, the ...

How to block access to a website by its dedicated IP address? [duplicate]

Guys I currently own a dedicated server with cPanel / WHM installed on it . I have a problem though . When I assign a dedicated IP address to a user , people can view their website by opening their ...

How do I get the name of the host (based on ip)? [closed]

I am not going to disclose the public IP address here , but is there a way on to get the name of the hosting PC / Server . Thanks

Updating a paid domain or subdomain to a dynamic ip [closed]

i was wondering if there was a service that is totaly free that can update the subdomain registered IP adress in the registry automaticly ? Like if i had a update script on the server that checks in ...

Identify clients in VPN network

I have a bunch of devices (raspberry pies) which are located in different buildings and networks and are constantly sending me some data. I need a way to be able to ssh to the devices. I am thinking ...

Google Analytics filter out public ip

I have an ASP.Net MVC application with Google Analytics. I recently added a few user's public IP addresses of the developers and other internal staff to a bunch of filters on analytics to be excluded. ...

How to block all ip's which are not in ipset list

I am trying to block all traffic except US and Canada. I added all US and Canada IP's to ipset geoblock and when i am trying this command. I am getting an error. iptables -A INPUT -m set --set !...

Curl is working but ping is not working when specify an interface

Running on Fedora 25 in a virtualBox, I attached 2 network cards with NAT configuration. I can see both interfaces and routes are automatically created by the system: $ ip route default via 10.0.2.2 ...

bridging does not work on Proxmox (OVH)

We are using ProxMox on OVH. We have followed the following guide in the way that can be seen in the attached screenshots down below: http://docs.ovh.ca/en/guides-network-bridging.html However, ...

Ping is working but curl not working on a specific interface

I would like to be able to make a curl through 2 different interfaces: ppp0 (data connection) and enp3s0 (ethernet connection). ppp0 connection is mounted by pppd. This gives the following route ...

Nginx still redirects even though I removed the rule from the conf

I was using this block for redirecting the website's IP to the actual URL: # IP to domain redirect server { # tell on which port this server listens listen [::]:80; listen 80; ...
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