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Questions tagged [ip]

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

IP (Internet Protocol) is a protocol which encapsulates data for transit across the Internet and encodes its source and destination addresses, among other parameters. It implements the network layer (layer 3) of the OSI model.

Questions related to IP (addressing, routing, and protocol issues) fall under this tag; questions merely containing an IP address do not.

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mail server mx record only shows dns ip

I am trying to setup BIND9 (Master and Slave DNS Servers), which I have done, and it is working as it should be (I believe). I can dig the domain name I am using and IPs and extract all the neccessary details from the zone file. DNS1 is running on…
Laird Brian Clough
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Workaround for site-to-site Azure VPN Gateway tunnel with conflicting IP ranges

We have site-to-site VPN connections using Azure VPN Gateway and various on-prem network appliances at respective client locations. We are trying to on-board a new connection, but have an IP range conflict with a network on the other end. The…
Brian
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How can I offer a dedicated IP service to customers?

I am working on an email project that could benefit from dedicated IPs in regards to sender reputation. A lot of email services like Mailchimp offer this feature. I am curious how to go about setting something like this up. Here are my ideas so…
sonrh
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Same IP twice in the same interface

I'm trying to find a bug in a program and I was wondering if it is possible to have the same IP twice in a network interface. For example, have network interface eth1 with ip 192.168.56.174 twice. I haven't been able to find any information on the…
jesusjimsa
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"docker-compose down" removes ip routes

On two different machines (a desktop and a server), the same docker-compose file behaves differently... On one machine docker-compose down seems to remove ip routes altogether that a following docker-compose up does not recreate. Transcript: After…
FLBzh
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Some XP clients intermittently getting wrong IP for STATIC IP Server

We have a server with a static IP, let's say x.x.2.5. We have several WinXP (but not all) that will occasionally resolve the hostname to x.x.1.59 (x.x.1.x is the local subnet). The DHCP range in the router is set to x.x.50-199 and the router has…
Matt Rogish
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CentOS 8 does not resolve DNS

Here is the very strange issue with freshly installed CentOS 8.0 I configured static IP with nmcli which essentially using NetworkManager. So turning it of is not an option as I want to follow RedHat's standard way of managing the system. Here is…
Zeebra
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Avoid local communication routed outside local network when using public domains

i have set up a server running Nextcloud and some other tools. To be able to access it from outside, i've already set-up DDNS and a DNS Entry for my domain nextcloud.mydomain.com referring to the DDNS, which works perfectly. The problem is, when i…
metinkale38
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Accessing networked computers by hostname?

I have computer with a host of DumbServer. When I try to connect to http://DumbServer or use DumbServer in Putty, it doesn't work. If I use the IP address, everything is fine. How do I set it up so that DumbServer works without having to add the…
SJaguar13
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Configure an Ubuntu ethernet interface for inbound-only connection

I'm trying to diagnose a connectivity problem on a headless ubuntu (16.04) server so I have a second ethernet interface (call it "eth1"), and I can use that to start a terminal ssh session from my laptop. What's the best way to disable outbound…
WiringHarness
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which means double 2 points 192.168.1.2::3 in a vnc connection

install real vnc to make connections to a windows server but at the time of accessing me it appears that to access I must approach it with the route 192.168.1.2::3 I understand that : after the IP means port but :: what does it mean?
Bryro
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IPv4 Addresses and AWS Elastic IP

So, the world is finally out of IPv4 addresses. It's been expected at least since I've been to college in 2004. But how is it that AWS have so much of this precious product, that they can give them away for free with every EC2 instance (free as long…
noamtm
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Does a reverse proxy use subdomains to know which private IP to route to?

I know this is very basic, but I'm very new to the reverse proxy, network admin world. Could someone provide a high level overview how a reverse proxy knows which server/port to route traffic to? Does it use a HTTP Referer/Origin Header or…
koral
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Do ports change for every request? Are Ip ports are different from system ports?

A typical ip address has >65k ports then again a system that runs localhost offline has port which sometimes face conflicts. Am very under-read in this area please give some light. Pardon my English. Thanks
saul
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List active sessions from tun interface

I'm running CentOS and have a tun interface with IP subnet 10.0.0.0/24 attached for "users". Is it possible to list current active sessions with netstat, ss or similar? Ex. netstat something: tun-mytest 10.0.2.32/32 tun-mytest …
Alfred Balle
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