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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Can't persist default ip route on Ubuntu 20 (Hetzner cloud)

I am using Hetzner cloud where I created 2 servers in a subnet (10.1.0.0/24) - one only with local ip, another one has public IP and is used as a NAT gateway for the first server. On private server I ...
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Checking visitors IP for open port 25 smtp and blocking this IP

I try to figure out which IP is a residential proxy. The most IP's with a fraud score +75 has an open port 25. A normal visitor's IP does not have port 25 open. So you can assume that it is a ...
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Jumbo MTU and switches

I have a network with several file servers, workstations and application servers. For simplicity we can consider it all attached to a single switch, say Dell 4032F with maximum Jumbo MTU size of 9216. ...
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PC/Switch (in one subnet) connect to Switch (in another subnet), but not to PC connected to the switch

Two subnets on the same vlan. Everything works fine within the subnets & can ping from PC/Switch in one subnet to the Switch in the other subnet. But, cannot ping from Switch/PCs in one subnet to ...
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Two IP addresses on different networks - Netplan

I have a server with only one network card (enp2s0) and I would like to have two IP addresses on two different networks. However, I would like to have one static IP and one using DHCP. The first ...
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Distribute one IP stream to multiple IP's

I am running raspberry pi and PIVPN. I need to distribute an incoming stream to one of the vpn's ip to the other ip's on the same interface (wg0) I am streaming from my pc (10.212.50.2) a srt or udp ...
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Openstack VM not accessible from Local network

I am new to Openstack and trying to deploy Openstack environment to instantiate VM for Customer Demo. I am able to instantiate VM and multiple VM are able to PING/SSH each other from console (accessed ...
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Can't configure unique IPs in Parallels VMs

I have 4 VMs running Ubuntu within Parallels (host machine is OS X). I am trying to set up SSH so that I can SSH into them, but I can't connect to them individually. They are all reporting the same IP ...
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SSL for destination ip forwarding

I have two ubuntu VPS. VPS_1: public IP = x.x.x.x VPS_2: public iP = y.y.y.y In VPS_1 I just only set a domain name for it and set iptables IP forwarding to VPS_2 (x.x.x.x:zzzzz >> y.y.y.y:zzzzz)...
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iptables Limit port : ip 1:1 ( each port 1 ip only ) in order to limit each user

we use port range from 1000-12000 and each port for one user, so basicly i need to limit each user port 1 <--> 1 ip iptables -A INPUT -dports 1000:12000 -m iplimit --iplimit-above 1 -J ...
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How many client PCs can access interent via a proxy which has only one public IPv4 address?

If I have one proxy server with a static public IPv4 198.51.100.138 which can access interent. How many client PCs in a local network can access Internet via the proxy server ?
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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 ...
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Cloning a UTM virtual machine - IP address the same?

Can someone point me in the right direction on how to configure the IP address of cloned VMs with UTM? When I create a new UTM VM, the IP address is different. This is fine. When I clone an exisitng ...
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Iptables, Limit the number of IPs connected to a specific port per second

iptables can limit connections per ip at the same time with the --connlimit command . but I want to know is there a way to limit connected IPs at the same time? for example, if you limit connections ...
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Wireguard - How to use wireguard for outbound only

I would like to run Wireguard vpn on my server to take advantage of another server's good routing. But of course I don't want Wireguard to take over my inbound traffic for ssh,hosted services etc. ...
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Assigning IP address to an embedded board

I want to explore the possibility of assigning an IP address manually to an embedded board. For example, a raspberry pi or an open mote b. Is there any way that this can be achieved through ARP? ...
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configure iis6 smtp server to send from a specific IP

We have a dedicated Windows 2016 server that hosts multiple websites. Each site uses the IIS6 SMTP server to send emails from the websites (enquiries, order confirmations, etc.) - each site has a ...
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KVM and Docker Containers on same Host to receive IP from DHCP (via bridge)

I've got a real host, headless and Debian as OS. On this host I've got a few KVM machines and a few Docker Containers. The KVM machines receive their IP from a PI-Hole DHCP in my network. Now I ...
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Want to set GRE as the default network

I have configured 2 servers, SERVER A and SERVER B. (I have followed this tutorial: https://community.hetzner.com/tutorials/linux-setup-gre-tunnel) I have used SERVER A for GRE tunnel to SERVER B (...
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Using external ISP/ipv4 allocation for home-based VPS

I am wondering if it is possible to connect/vpn my host machine to an external service that would allow more public IP allocation. I have looked through countless sources and articles and the closest ...
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How to achieve 2 servers to communicate over HTTPS and IP addresses

I am not an expert in this topic and so did a lot of research but could not find a clear anwser that I could understand. I have 2 webapps (microservices) on 2 servers/machines. The webapps communicate ...
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Will a web server get blacklisted for port scanning?

As I understand it, port scanning is an activity that can be a precursor to malicious activity, as one of the things it is used for is to scan for open ports that one can attack. In that train of ...
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How does DNS work with websites that have large traffic and multiple servers? [closed]

Based on what I learned from CS50x, each computer on the internet has its own unique public IP address. Some computers are used on the client-side to access websites, while other computers are used as ...
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Using burp to redirect all traffic to a specific domain (and all subdomains) to a different ip address

there is a site a.com with many subdomains b.a.com, c.a.com etc... assume that the ip address of a.com (what the dns returns) is a.a.a.a I want to redirect all traffic to a.com and it's subdomains to ...
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Configure a DHCP server with isc that gives the clients IPs depending on the OS

The problem is that I cannot put a static IP or filter by mac because some clients have dual boot and use both Windows and Ubuntu, I need to be able to somehow distinguish between both OS and both ...
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How to remove virtual network adapter?

Recently, I added one layer to my network(basically I've a router doing only a modem, with its own 192.168.0.x network, and then my new LAN+WIFI router having the 192.168.1.x network). Only my new ...
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Many external "On-Link" IPv4 addresses shown as Persistent routes in Windows

When I run route print on my "normal" Windows 10 Pro machine, the "Persistent Routes" section lists 136 (!) Network addresses with a /32 mask, and "On-link" as the ...
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Instance created in multipass without IP address

The error is the following, when creating an instance in multipass it is created without an IP address. I run the multipass launch command, and the instance is created normally. C:\Windows\system32&...
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Sendgrid IP Address Consistently Blocked on RATS-Spam

Overview For our application, we use SendGrid to send emails to many of our users. Recently over the past few weeks, our SendGrid IP addresses have been added to the RATS-Spam blacklist multiple times....
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Nginx Proxy Manager does not report correct client IP in logs

I am new to networking and ran into an issue where the nginx proxy manager logs (proxy-host-*_access.log) report "[Client 172.19.0.1]" for all traffic making it useless in identifying who is ...
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Error restarting networking service

I am trying to set both a static ipv4 address and a static ipv6 address on a home hosted Debian 11 server (it's actually just a PC). Here is my /etc/network/interfaces : # This file describes the ...
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Apache's remoteip module does not populate the client_ip

In an intranet environment, I have a relatively involved scenario, all on the same server: IIS server acting as a reverse proxy listening on 443 forwards matching requests to localhost:1080/redmine ...
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Trouble connecting to the internet with direct connection to the modem

I have a windows server that is directly connected to the modem but cannot connect to the internet with the APIPA self-assigned IP address. There's no router/DHCP as that's going to be the servers ...
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Will the raw table ever receive fragmented IP packets?

Assume the conntrack module is loaded (thus nf_defrag_ipv4 is loaded). Will there ever be a situation in which the raw table receives a fragmented packet? In particular, will a BPF rule (loaded ...
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Changing IP range that holds the Primary Domain Controller

My domain includes a few /24 ranges over an MPLS and we've recently acquired a business which uses the same /24 range as my Primary domain controller (172.17.0.0/24). Because of this clash, I have 2 ...
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hostapd: assigning static sub-IP based on MAC

I've set up an access point / wifi-repeater via hostapd on my raspberry pi using this incredible tutorial. Now I want to ensure that the connecting clients have a "static" IP in the subnet. ...
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Fixed IP address to an EC2 Instance in CloudFormation

I'm developing an infrastructure in CloudFormation where the database and the application is separated, but since I don't know what IP my application will receive, I can't create a filter for the ...
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Static IP configuration with ip command in Linux gives Destination Host Unreachable

I am a total newbie when it comes to network configuration. I would like to configure my Ubuntu 18.04 PC so that it connects to a device. I use USB to Ethernet converter and connect the ethernet jack ...
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Configure persistent wireguard network interface

I have configured Wireguard VPN on Alpine Linux 3.16.2. Manual server and client configuration works fine. uname -mrs # Linux 5.15.60-0-virt aarch64 ip link add dev wg0 type wireguard ip address add ...
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Routing all VM traffic from NAT to second NIC on Hyper-V server

I have a Hyper-V server running nested in an Azure VM. There are two Azure subnets, 192.168.169.0/28 and 192.168.169.16/28. The first NIC, used for only host traffic is connected as 192.168.169.4. ...
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Port Number only working when using IP to connect, not URL

so I have a nginx server listening on port 80. Works fine. I can connect to it via "exampleip" and "exampleurl" Now on my dedicated server I have another program on Port 9999 If I ...
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Can this two IP see each other?

I can't remember how networking worked. I need someone to help me with this, it may sound a bit stupid but I have to take care. This are the two IPs: 107.1.233.7/24 10.202.104.148/25 Simple question....
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Unable to access other guest operating systems when using openvpn

I am learning to set up a VPN network but I'm running into scenarios that I don't understand due to my weak knowledge of networking. For my education, I thought I'd take two computers, host a VPN and ...
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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 ...
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Install a CDN on a subdomain in a different IP: error 523

HAPPY MONDAY I have Ubuntu instances running on 2 servers: Server1: Docker, Cloudflare-OZNU-API and Nginx Proxy Manager, wildcard for: domain.app and *domain.app. Server2: Apache2 - PHP7.2, Certbot ...
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Access drive dump from Ibm 35p1970 LTO over ethernet

I am trying to get drive info from an lto 6 fh drive that belonged to a library. I don´t have a fibre connection, as we use sas for tape. I connected the drive to an atx psu and one of those serial to ...
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How can I forward a port from the IP of an network interface to the same IP with iptables?

I need to forward a port in an IP of an interface to the same IP but with a different target port. First I add a bridge and add an IP to it: ip link add br0 type bridge ip link set br0 up ip address ...
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How to keep IP address when ethernet cable unplugged linux?

My board has wlan0, ppp0 and eth0 interfaces and I always want to keep my IP address on eth1. How can I do this?
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VPS can not be reached in any way from some clients; IP routing issue?

I have been running a VPS which is situated in Amsterdam. It has not given any problems, and can be reached from most locations reliably. Except when a French customer was not able to reach the server ...
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How to set specific broadcast IP address on Windows

Problem: I have a machine Sender, that sends packages to a certain IP address in a local network. I have also machines A, B, C, etc, connected to the same local network. I want these machines to ...
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