Questions tagged [ip]

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

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Why the IP cannot be used directly when the IP mapped to the host name as a host entry works?

I was given an API for a service through which I tried to send a post message from server A, but the connection cannot be built. Then I ping the domain name in the API. It doesn't work, so I thought ...
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How to block RFC-4193 for IPv6?

For IPv4 I have a rule that blocks the VPNs to access the local addresses like this: :PRIVATE_ADDRS_FILTER - [0:0] -A PRIVATE_ADDRS_FILTER -d 10.0.0.0/8 -j DROP -A PRIVATE_ADDRS_FILTER -d 172.16.0.0/...
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Tunnel IP address

I'm using Pantheon to host my website. The website is using some third-party service through API, and this service can allow only one IP address to access it. The issue is that Pantheon changing IP ...
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How to get rid of secondary IP address without disabling dhcpcd (because there is no DHCP server anyway)

I have one system running RHEL7 that mysteriously keeps coming up with a secondary IP address in addition to the one I set statically. When I do "ip addr show eno0", it describes this ...
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## Heading ## determine the real ip to some host from his vpn

I need some methods to help me in my job to determining the real ip for some host that i got a vpn connection for him from facebook website or whatsApp?? Heading
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1answer
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Email click results in multiple requests from different ips and user agents

i run a small website that tracks game attendance for teams. Email is dispatched to the team players with 3 links in the email, 1 for attending, 1 for not attending, 1 for might be attending. Each ...
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1answer
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Is it possible to implement a TCP/IP network over DECT?

I am working at a site where DECT is implemented on Mobile Devices, and I am wondering if it is possible to setup a TCP/IP network using DECT as the data transmission layer.
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Cisco GRE routing semantics to ip_gre

I am reading this article about setting up a GRE IP Tunnel: https://packetpushers.net/anatomy-of-gre-tunnels/ There's a section about creating a GRE tunnel interface on router A R1: interface ...
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Cannot ping two computers with each other on the same switch. (Newbie)

I am an absolute 0 in network science and I would like to understand it a little bit. We have an offline machine connected to a switch, which is also connected to a series of other hardware that ...
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1answer
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Subdomain with variable IP

Subdomains like http://3qax.munzer.webproxy.idc-lorien-apiver01-repay-action.bh-arppofind.comssets.mealcardhss-int-bh-awwwppofind.wire.2.homeetingroom.walmartmobile.cn presents a behavior that when I ...
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How to enable access to IPv4 users?

My router works with IPv6, I tried to open a IPv4 server but due to CGNAT no one could access my web server. I asked to some friends to test it, those without IPv6 couldn't reach it. ReqBin also could'...
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Configuring VirtualHost in Spring Boot application embedded Tomcat server in Windows

I have a private Windows server running a Spring Boot jar file and I can access it via the IP address. I have a few websites available which I am able to access via the IP address and filters. (Note ...
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Linux Kernel IP Forward activated, firewalld is bypassed?

On a Linux Centos7, I have some traffic that is routed with static routes from one interface to another. I did notice that with firewalld activated, both interfaces added in a zone, and nothing ...
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What can cause 'Network is unreachable' when the link is up, the route is there, and the netmask is correct?

What could cause this? $ sudo ip route show 192.168.100.0/24 dev usb0 ...
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Proxy with mobile IPs

How can websites, like BrightData, rsocks.net, and others, offer a proxy product that is using a mobile IP address? To my understanding, mobile operators block all incoming communications in their NAT....
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2 Different Public Address for High Availability

this is my first time asking a question here, and I was wondering is it possible to have two different ISP public IPs connected to a single system for high availability? for example, if our ISP 1 ...
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Why does facebook only have 2 IP addresses? [closed]

In the process of setting up DNS for my own website I got curious about looking up a large company's DNS record. I chose facebook.com and used dnschecker.org to view their dns record. Ignoring AAAA ...
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find the ip address on Linksys [closed]

I get two differents Linksys routers : WAG54GX2 and WAP54G. I tried to get the IP address to reset the routers correctly and verify if they are still working. So I use the RJ45 cable on my routers and ...
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How to access IP4 server from IPv6-only MacOS client

My telco provider made some unannounced changes to my iPhone's hotspot settings last week, whereby they essentially disabled my phone's hotspot from providing its clients with IP4 (DHCP assigned) ...
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Problems related to ip requests related to translation services in the internal network

Our team is planning to use translation services and OCR services on the internal intranet network. So I opened the firewall for ip communicating with translate.googleapis.com and vision.googleapis....
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How do Virtual IPs allow fast switching?

I am designing a simple fail over system with just a primary and standby server. The main one will be in our office, while the standby will be on the cloud. I was reading about virtual IPs and how ...
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ssh into a server without a public IP from a server without a public IP that is hidden behind a server with public IP

I have the following setup: I would like to access machine A from machine C, but neither of those have a public IP address. Machine C is, though, in the same network as machine B, which has a public ...
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Flushing IP table doesn’t flush NAT

When I execute sudo iptables -F,my iptable rules for the nat table are not flushed. Why is this the case? What does the above command do? I believe there are three tables: filter, nat, and mangle. I ...
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Wireguard - How to only tunnel some of the traffic

Is it possible to set up the Wireguard server so that only a list of ips [A, B, C,...] is tunneled via Wireguard - while the rest of the traffic is ignored and goes through the non-Wireguard interface?...
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1answer
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Tracking the IP and Physical address of the machine originating an email message

My organization is using Google's email services for the creation and management of their email accounts. Recently, an objectionable email was sent from a Gmail ID (presumably a fake account created ...
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1answer
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How can i bind a network interface to an entire /48 subnet of IPv6 addresses without having to enumerate each and every individual address?

Context I need to know how to setup an entirely /48 IPv6 block in my server to perform outgoing requests with any of these IPv6 addresses without setting up each one individually. My ISP provides this ...
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Are their public IP ranges which don't belong to any country?

I've been working on project and we use IP geo-location using an API to identify user's country. The legacy code has an edge case when there is no country information for a particular IP. I have been ...
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Why is net-dhcp-leases coming up empty in VIRSH?

From the following command virsh net-edit default, I see: <network> <name>default</name> <uuid>7a106327-942a-40e7-a977-018b5323832a</uuid> <forward mode='nat'/&...
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1answer
551 views

Router doesn't have a public ip adress

I have a problem with my ISP where my router gets a different ip adress compared to my external ip adress (the router doesn't have a public ip adress). I previously setup a VPN service with EdgeMax ...
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2answers
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Redirect IP to another if not available

I have 4 IPs something like that 10.10.10.11 10.10.10.12 10.10.10.13 10.10.10.14 and two ports 1000 and 1001. my Linux server should connect those IPs with ports. Now I want to make this process ...
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1answer
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All Outbound Traffic Uses IPV6

I have a Debian 10 server which has postfix installed, each time I try to send outbound mail traffic, the server uses IPV6 over IPV4. This causes postfix to log Connection timed out. I have tried ...
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Security issues with configuring default IP address(0.0.0.0) to ethernet interface

In our linux embedded application we would like to keep available ports up and running and assigning with 0.0.0.0 IP address. In short we will be executing all ports with ifconfig ethX 0.0.0.0, and ...
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How to create TCP proxy that supports multiple hosts?

I would like to create a TCP proxy that supports multiple hosts. The example I saw was where a DNS server was used to point a specific host to a TCP proxy which had the host hardcoded in it. The TCP ...
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Apache2 on Centos 7 will not let me restrict access to IPs other than my own

I am trying to restrict access to any IP but my own, and I've searched up how to do it but it doesn't work. I've searched up how to do it on CentOS, but nobody cares about CentOS so there's no help ...
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1answer
144 views

Is it possible to force the DHCP server to assign a different IP address each time the address is renewed?

I need to detect IP address renewals in my C++ Linux application and check if the new address is different from the old one. I have access to a router running OpenWrt. I can change the lease time, but ...
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How to configure and use all the IPs given by my provider?

Need assistance on how to use all the Ips given from my hosting provider. Currently i have 5 IPs that is routable and can be used on any circumstances. I wanted to make a new environment on my ...
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Suitable configuration for failover for ISP diversity?

My Internet connectivity is currently via a DOCSIS cable modem in bridge mode. It's supplied by the ISP and I can't do much to change its configuration. The link is not very reliable, it's prone to ...
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1answer
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Fail2ban with Firewalld on RHEL 8 - Fail2ban seemingly blocks IPs, but they are not really blocked

I'm running fail2ban on RHEL 8 using firewalld. According to the fail2ban log (with DEBUG level) it blocks IP addresses without any error, but in fact there are no such rules in firewalld and nftables....
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Wildcard SSL not working for subdomains

I have a wildcard SSL for my website, I want to access my site using any subdomain like abc.immersive.com,xyz.immersive.com etc. I tried to ping these sites, its pinging successfully and pointing to ...
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On premise SpamTitan appliance injecting IP routes

We recently migrated to a new firewall and most things were okay apart from email flow. There was a queue on SpamTitan which wouldn't release. When I checked the routing table, rather than using the ...
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Remapping overlapping VPN Ranges (including DNS)

I have the following scenario, with a VPN connecting two companies together there is some overlap in the used private subnets. So the solution I was trying to achieve is to remap the remote subnets to ...
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1answer
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finding which tier 1 or isp to connect to to reduce latency [closed]

I am looking to connect to 4 location p,q,r,s. I a ntrying to find the set of locations where I should connect to (isp or pop) to minimize latency . Is it lower latency to connect to a tier 1 network ...
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1answer
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Why is a host sever location displayed differently?

I am very new to this field, and would like to get an explanation on the mechanism of the below. When I check the location of a host server, sometimes they show the location differently. For example, ...
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1answer
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Connecting Computers accross different subnets or IP addresses

I have a setup that involves: Cable modem/router at 192.168.10.1 Wireless Router 1 at 192.168.20.1 Wireless Router 2 at 192.168.30.1 The wireless router are connected to the Cable Modem via the WAN ...
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Some Google Cloud SQL Authorized Network IPs do not work?

I use Google Cloud SQL for my databases. It's connected to my website and working just fine, but I also authorized my local computer to access the Database via Sequel Pro. But for today, I went to my ...
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No gateway / LAN without internet / CCTV system

I've tried to post this on superuser.com but they don't accept questions from Tor network now for more than a week so I hope I can find help here since we could say it's network administration ...
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Issues with Ubuntu Network Setup

Please, someone tell me whats up here, I am going bonkers, I have used multiple calculators etc, everything tells me the details in the image are correct but ubuntu just will not accept.
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Why we would need public IP in LAN vs NAT

could somebody explain why I would need some public IP for an equipement inside the LAN while I could NAT it ? Why a company could be provided a full subnet of public ip and not just one for the ...
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Ubuntu 20.04 cloud image can't get IP address

When using virt-install to create a guest, CentOS 7.9 cloud image successfully gets an IP address, which can be checked with sudo virsh domifaddr <domain>. However, Ubuntu 20.04 LTS cloud image ...
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Decoupling IP address from hosting provider

We run a service that provides on demand websites to our users as part of our offering. In order for our users to use their own domain with our website feature, we have them create an A record to our ...

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