Questions tagged [ip-address]

IP address is a numerical label assigned to each device participating in a computer network that uses IP for communication.

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ISP gave me one public IP (WAN) AND a block of public IPs for use [closed]

I have been given a range of public IPs from my ISP, plus a single IP they route to. What's the best way to go about this? Not looking to firewall or NAT, just distribute the IPs to two different ...
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1 answer
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Is there a way to get the IP address of the interface on the other end of a wireguard tunnel?

Server 1 is the Wireguard server (listening). Its Wireguard interface wg0 interface IP is 10.100.100.1. Server 2 is a Wireguard client connecting via the Internet to server 1. Its Wireguard interface ...
7 votes
3 answers
1k views

Amazon EC2 multiple private IP addresses per instance

I have a scenario where an application requires multiple private IP addresses but does not require the resources of multiple instances. In this case, I would like to run multiple jboss instances on ...
124 votes
5 answers
226k views

What is this IP address: 169.254.169.254?

I have always noticed an IP something "169.254.x.x" in my routing table even when I am not connected to any network in my Windows operating system. In Linux, when I list my routing table. $ ...
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1 answer
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Domain name resolves to IP address

I wanted to get clarity on this issue (instead of the usual try-stuff-till-it's-fixed approach). As a developer and curious person I really want to understand what's going on here so I can ...
5 votes
5 answers
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What does a CIDR mask mean in the context of "ip address add"?

I'm attempting to learn to set up Wireguard properly (not just by copy-pasting). I've come across this line on the quickstart page: ip address add dev wg0 192.168.2.1/24 Reading the man page for ip, ...
32 votes
14 answers
87k views

How can I display the IP address of an interface?

If I want to display the IP address that is assigned to eth1, how can I do this in Bash?
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1 answer
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Creating a server with fixed IP that can be freely moved among networks

Given a public /24 prefix, announced via BGP, 192.0.2.0/24. I have split this prefix into various smaller networks. I would like to use 1-2 servers for the DNS server (forward and reverse) which needs ...
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1 answer
745 views

RTNETLINK answers: Cannot assign requested address

161: ovs_bond0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1 link/ether 00:11:32:xx:xx:xx brd ff:ff:ff:ff:ff:ff inet 192.168.0.20/24 brd 192.168....
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Is it possible to change the routing preference on an existing Azure public IP address?

When creating a public IP in Azure, you can set the Routing Preference to "Microsoft Network" or "Internet Routing". But looking at an existing public IP in the Azure Portal, that ...
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1 answer
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Docker renaming network interfaces

I am trying to rename the network interfaces inside a docker container. Right now they are eth0, eth1, eth2, etc. I would like them to have different names. I know how to do it in Ubuntu with ...
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running systemd-run with some bpf-firewall rules as regular user does not work

I'm trying to run a program with restricted networking via systemd-run as root systemd-run -p IPAddressAllow=192.168.253.1 -p IPAddressDeny=any PROGRAM works nicely but as regular user none of the IP ...
1 vote
2 answers
3k views

Nginx - If IP then proxy_pass else return 403

I am trying to proxy_pass users with certain IPs to http://server1 and certain other users to http://server2. I'd like to return 403 if the user doesn't match any IP. Here's what I have: geo $...
3 votes
4 answers
1k views

Find ISP/IP address by geographic location?

I'm trying to find an ISP or IP address by geographic location, Is this possible?
286 votes
5 answers
379k views

What's the difference between IP address 0.0.0.0 and 127.0.0.1?

I know that 127.0.0.1 ~ 127.255.255.254 are the loopback IP addresses for most modern operating systems, and these IP addresses can be used to refer to our own computer. But what's 0.0.0.0? It seems ...
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1 answer
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postfix restrict smtp sender based on ip address

I have a postfix server that I inherited many years ago. Originally it successfully controlled the sending of messages through authentication and IP addresses - if an authenticated user was sending ...
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ip address inet 127.0.0.1 changed unwillingly to 172.27.28.124 (Ubuntu 20.10 without netplan)

Below you can se the address 172.27.28.124 being used for lo. However the address was a few hours ago 127.0.0.1, this is the good value. This should not be changed. Could you please advice on how to ...
0 votes
1 answer
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Accessing a REST API from behind a firewall: whitelist the API's outbound IP addresses?

We have two applications. One application exists behind an on-premise site's firewall. It communicates with our second application, a service app that operates a REST API in the Azure cloud. My ...
1 vote
1 answer
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IIS 10 website with hostname served by Default Web Site

I have configured some websites in IIS on my Windows VPS. When I am accessing this subdomain installer.app-wards.com from the server, it's going to the wwwroot folder from Default Web site instead of ...
0 votes
1 answer
167 views

If I change my router's IP address, why do all client devices assume it's at 192.168.1.1? [closed]

I've decided to set my router at some non "1.1" IP address. I have even created a QR code for connecting to the Wi-Fi. The problem is, it looks most devices assume that if the DNS address is ...
0 votes
1 answer
549 views

Re-route all incoming traffic to my home computer over the wireguard interface

I have setup a server in AWS with WireGuard server installed on it. I configured the server and the client and the vpn connection is up and running. I am able to ping from my local computer to the ...
0 votes
1 answer
244 views

Stop Nginx from listening on all loopback IPv4 addresses EXCEPT 127.0.0.1

On Ubuntu, Nginx apparently listens on all of the IPs in 127.0.0.0/8. How can I disable listening on 127.0.0.0 and 127.0.0.2–127.255.255.255? That is, the only IPv4 loopback address that I want Nginx ...
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2 answers
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Connecting to Google Cloud MySql DB with a changing IP address

I connect to a Google Cloud MySql db from my laptop, however my IP address not only changes at home, but also when I travel. I have to specify the allowed public ip address in Google Cloud, but every ...
1 vote
1 answer
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How to connect to host in a different address range and VLAN

We have an industrial machine that has an intergrated web server we can connect to for changing parameters. The machine has an address in the 172.29.x.x range. My address is in the 192.168.x.x range. ...
26 votes
6 answers
37k views

IPv4 CIDR Ranges for Everything except RFC1918

I'm looking for a list of CIDR blocks for "The Internet", i.e. everything from 0.0.0.0 to 223.255.255.255, excluding RFC1918 address space of 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 (yes, I know ...
0 votes
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Firewalld Allow 1 ip address from a subnet and drop the rest

I am using firewalld to control access to my AlmaLinux 8 server. I have several subnets defined as sources in the DROP zone and it seems to work well. I am wondering if is easily possible to allow ...
0 votes
0 answers
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Website IP address doesn't match up with any EC2 instance IP addresses (AWS)

I've been asked to look at some non-technical friends' AWS account because they're worried about their costs, but I'm struggling to find where they're spending their money. In particular I'm getting ...
4 votes
10 answers
6k views

Management of Static IP Addresses in the data center

The university where I work uses DHCP for the vast majority of our IP addressing needs. Workstations and the like. However for servers we obviously use static IP addresses. The current method to ...
1 vote
1 answer
858 views

403 Forbidden on initial load after installing NextCloudPi

I am making this post mostly for awareness in case anyone else is having a similar issue. Story I am running nextcloudpi (nextcloudpi.ownyourbits.com) on a Raspberry Pi 4 8GB using the Debian Buster ...
-1 votes
1 answer
68 views

Windows folder share permissions

I suppose this is straightforward but can't get a solution for it. When i share a windows folder (server 2012) and set its permissions (share or ntfs) then if someone from the network writes "\\...
0 votes
2 answers
759 views

Bind nginx to vpn address only [closed]

I am probably unnecessarily paranoid. But still also I think paranoid isn't too bad when it comes to security. I have a web server running on a VPS. I run zerotier on all my VPS and my home machines. ...
2 votes
1 answer
563 views

How to make systemd journal remote use hostname instead of IP address?

I do have one log server which runs systemd journal remote software to receive journal entries from remote hosts via systemd journal upload. This works fine. The only trouble that I have is that the ...
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Map IP Address (NGINX running) in cloudflare

I have an IP address 65.1.106.XXX. In this instance, Nginx is running and I can able to see the nginx status page through this IP address. Now I'm trying to map the subdomain to this instance IP ...
0 votes
2 answers
7k views

How do I remove a HTTP header in Apache, if a certain IP access it?

How can I unset single/multiple HTTP headers when my website is accessed by a particular IP address? Because my CSP config blocks some local pages from loading properly. For example, if I have ...
0 votes
1 answer
1k views

Can't obtain ip-addres from my DHCP server

I can't obtain a ip-addres from my dhcp-server and it's going trough a firewall (pfsense), The firewall(pfsense) and DHCP server are two virtual machines on my physical server(ESXI). As rules i use ...
3 votes
1 answer
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apache 2.4.54 (httpd) require not ip not blocking ip addresses

So I am running apache 2.4.54 on a redhat centos 7 machine. I am using the below configuration to run my django application with mod_wsgi: # create new #LoadModule wsgi_module modules/mod_wsgi.so ...
0 votes
1 answer
354 views

Debian server changing ip address

I had set up a Debian server with an ip address that was assigned to another device by accident. I forced the server to connect through /etc/network/interfaces but am still finding it switches to the ...
2 votes
1 answer
2k views

How to change the network adapter bind order in Linux

The SNMP trap always uses the first IP address as displayed in the network adapter binding order on the computer. For example, assume that the computer has the following binding order: LAN connection ...
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2 answers
2k views

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 ...
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6 answers
8k views

How can I get the IP address IPV4/IPV6 on linux

I don't have much knowledge to network layer, I know the basic command to get ip address. Have one requirement where I need to read ip address and it should work for any linux or unix system. I am ...
0 votes
2 answers
132 views

All IPv6 prefixes that should be routed by a public router

I need a list of IPv6 prefixes that that cover the public internet with the fewest possible entries. I´ve found the answer for IPv4 here: IPv4 CIDR Ranges for Everything except RFC1918 The problem is ...
0 votes
1 answer
2k views

Nginx change default IP form 0.0.0.0 to pecific IP

I have nginx running as a web server. The virtual host have the IP specific configuration with IP addresses listed, however whtn I check netstat Nginx is litening on 0.0.0.0:80. I would like to change ...
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0 answers
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Tentative of shh->rsync to wrong IP; potential security risk?

I have set up a little RPI backup 'server' (with rpi OS) on my LAN. I use it to create a backup of my main personal machine data using rsync, and I reach it from outside my network through SSH (key-...
0 votes
2 answers
3k views

Finding the IP Address of a computer (through a firewall)

I am looking for a way to find the IP address of a computer connected to a network. The scenario is the following: The computer whose IP address I want to find is connected to the network. This ...
0 votes
1 answer
323 views

Should I create reverse zone in bind9 if I don't have authority over the ip address?

But I don't manage the ip address blocks... I have 2 dedicated servers each in different data centers the first provider offers me a panel to configure the reverse zones myself, in this case if they ...
1 vote
1 answer
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issue with pacemaker ipaddr2 and IPsrcaddr

I'm having trouble with setting up a cluster which contains two nodes. I want to setup a cluster with two centos nodes with a floating ip address and all packet which sends out from my active cluster ...
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1 answer
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Any way to join a server to Active Directory Domain by IP address in hostfile and not DNS?

To my knowledge their is no way to join a server to AD without the server being able to resolve the AD domain via DNS. Joining requires being able to get multiple records from DNS - including SRV ...
1 vote
0 answers
773 views

How can I make TPROXY option in iptables work when the destination proxy address is a non-local one?

I installed a TPROXY server in my router that forwards the traffic to a SOCKS5 server. The router has the address 192.168.1.1 and my PC has the address 192.168.1.33. Also, I have a local bridge "...
0 votes
4 answers
1k views

Why does a domain resolve to private IP

While going through a domain in the format as mentioned below , I did host lookup using the host command and got a private ip address. auth-ns.auth-ns.workspace.agate.example.com host auth-ns.auth-ns....
0 votes
1 answer
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Keeps setting windows-server-2012-r2 up in america (cali) when location is set to australia-southeast1-a

I have just tried to set up 2 back to back servers in Australia but for some reason when the servers deploy they are located in America in California. Any idea how to fix this issue? Both Zones are ...

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