Questions tagged [ip]
IP - Internet Protocol, the most commonly-used set of rules for dispatching data across a large computer network.
2,866 questions
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Routes are getting lost on OVH VPS
For my tunnel I have added the following route and rule:
ip rule add from 127.0.0.1/8 iif lo table 123
ip route add local 0.0.0.0/0 dev lo table 123
It works fine for a few weeks and then it suddenly ...
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0
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Static IP Assigned by ISP is in Private Range (172.168.4.50) and Not Reachable from Outside [migrated]
Issue Description:
I am trying to set up file transfer between my Raspberry Pi and an Ubuntu desktop using a FastAPI server. Here’s my setup:
FastAPI Server Setup:
Deployed FastAPI on the Ubuntu ...
0
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1
answer
64
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VPN & changing outbound interface per user - correct source IP but wrong interface
I am connected through a VPN and I want some user accounts to bypass it. VPN interface is tap0 (IP is 172.16.x.x), the main one is wlan0 (IP is 192.168.10.3). All regular traffic goes to the Internet ...
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Finding IP addresses for AWS Lambda
AWS provides lists of IP ranges for its services, and documentation if available to "Get all IPv4 addresses for a specific service in a specific Region". However, services is the list are ...
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Add default route on physical interface using `systemd-networkd`
In /lib/systemd/network/10-eth0.network on my client, I am failing to configure anything that can translate my manual command:
sudo ip route add default via 192.168.7.1 dev eth0
where 192.168.7.1 is ...
- 135
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3
answers
1k
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How to find domains that have IP address 142.251.211.234 defined, belonging to a google API?
I'm searching for domains that own IP addresses that I'm seeing traffic to in my GCP network, in order to configure a firewall rule for that specific domain.
For 142.251.211.234, I know it's a Google ...
google-cloud-platform
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1
answer
53
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Is it possible to differentiate devices connected to the same router in nginx logs?
We have a web server running nginx and a Rails app. Our logs have this format:
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $...
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1
answer
85
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What happens when multiple customers share same public IP
What if the destination IP and port of different customers sharing the same public IP are the same too, and the source port and source IP are the same as well? How will ISP router differentiate then?
...
- 101
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2
answers
99
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Postfix mailserver with two IPs. Map each sending IP to different application
I have one mail server (Debian 12, Postfix) with two public IPv4 IPs for two applications.
I must send all emails from application A from IP 1.2.3.4 and application B from IP 5.6.7.8.
Both application ...
- 228
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45
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Server with 2 ip address change outgoing ip address
I have a server with a single eth port the primary ip address is assigned by dhcp.
I have a secondary ip address (failover ip) that I want to add and configure as outgoing ip address.
This is the ...
- 111
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1
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106
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Any issues with changing IP address on newly configured domain controller?
In the middle of replacing an old DC with a new one running Windows Server 2022.
Just about everything is done on the new server, DHCP, DNS, roles transferred, etc. and the new DC is replicating ...
- 429
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44
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Unable to create VLAN on top of vbond
I am using CPU
Model name: Intel(R) Xeon(R) CPU D-1581 @ 1.80GHz
with two 10G NIC's
02:00.0 Ethernet controller: Intel Corporation Ethernet Connection X552 10 GbE Backplane
02:00.1 Ethernet controller:...
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1
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107
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Multiple switch devices with same gateway IP in one LAN
guys,
I have here a client who use 3 switches in his LAN, but with these switches have the same default IP of 192.168.0.1. My question here is: why the devices(around 30) with manual set IP (from 192....
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1
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39
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How to return longest IPv6 formt when using `ip` command on Linux
When I use the command ip address show eth0 my Centos shows my IPs using this format 2600:5c35:e991:92b::3/64 but I would like it to return in this format 2600:5c35:e991:092b:0000:0000:0003/64 which ...
- 316
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70
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Dhcp range with fixed Ips
Here I have a DHCP server with some IPs with fixed IPs that are in the range 192.168.1.91-254.
And for the leases only the range 192.168.1.11-90.
But I want to make the lease range bigger can I use ...
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68
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How do I get packets to egress to the tap0 interface rather than the lo interface?
I ran ping 10.0.0.1 and ping -I tap0 10.0.0.1 to see if my custom tcp/ip stack would receive them.
Instead of sending the packets through the tap0 interface, they are sent through the loopback. I ...
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0
answers
54
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Hyper-V Server (Azure) IP Change
I'm having issues changing a server IP in Microsoft Azure Server. The system keeps giving me an error though I'm following the prompts. I have not been able to find much information on how to make the ...
1
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2
answers
126
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Blocking duplicate IP addresses within network
I have a self contained network, which at the moment consists of 13 machines with PLCs connected to three unmanaged TL-SG105S switches in one room.
The idea was to connect a laptop to one switch, and ...
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37
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Glue DNS records not reflecting new address
On Ubuntu 24 using bind9 to config my DNS entries.
I got my domain pihosting.ca from GoDaddy and I updated my nameserver ns1.pihosting.ca to reflect the new server address 209.15.158.25. the old IP if ...
7
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2
answers
1k
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How to temporarily disable a primary IP without losing other IPs on the same interface
Context
I am working on Centos 7 and I have a network interface eth0 configured with multiple fixed IP addresses (I am only concerned about the IPv4 addresses here, I do not care what happens to the ...
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3
answers
529
views
Change source IP address, send over eth0 instead of lo
If a packet is sent using TCP and source address 127.1.1.1 (lo) and destination port 80, I want to be sent over eth0 and source address a.b.c.d instead.
How can I get this working?
I tried:
iptables -...
0
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0
answers
257
views
How to assign multiple IP addresses to one client in OpenVPN Network?
I have an OpenVPN network and I need to assign multiple ip addresses to one client (like 10.8.0.10 and 10.8.0.12) But i could not figured out.
is it possible to do it?
Firstly, I tried to create ...
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0
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1
answer
88
views
DNS issue, Website only accessible through specific network service providers
I recently shifted my domain www.magina.in from Google domains to squarespace. Thinking that the transfer would be easy as google has closed it’s domain business and shared it to squarespace. After ...
0
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2
answers
440
views
Configuring Routed Static IP Addresses from ISP on Linux Router
I have received 4 static IP addresses from my ISP on a business plan which are to be used on a Linux-powered router and configured via the ip command. My previous ISP gave me 4 /32 IP addresses which ...
0
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0
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148
views
Use 192.168.1.x on docker-compose
I'm installing an OpenVPN Docker container using docker-compose and I need to change the IP range from the default 172.17.0.0 to 192.168.1.x.
I tried adding to the /etc/docker/daemon.json file:
{
&...
- 101
0
votes
1
answer
52
views
Domain DNS settings for email
My email is hosted on a server, IP x.x.x.x.
I'm using domain example.com to display a website. My domain is IP y.y.y.y.
Current settings:
A mail.example.com x.x.x.x
A webmail.example.com ...
1
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1
answer
78
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Can I see from an outside perspective if a IPv4 and IPv6 address are mapped to the same server?
I am using a shared webhosting, for which I have an IPv4 and IPv6 address pointing to the server. I am wondering, if any user can see from the outside that both addresses point to the same server? Are ...
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63
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Change interface/IP service binds to
I have a few Node.JS and TypeScript application. Some uses SNMP and other internal services. None of them have any specific bind/sourceAddresssettings.
I see services binding to the wrong interface ...
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0
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1
answer
135
views
UDP traffic DNAT doesn't return as expected
I'm looking for a solution with the following situation.
There is server1 with public interface eth0 and IP 33.33.33.33 and GRE interface 10.10.10.1, GRE tunnel point to second server2 with public ...
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1
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101
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Map internal VMs to one domain for external access [duplicate]
I have the following situation that kinda got me stuck, since it's not really my area of expertise.
So, we have an internal server with multiple VMs, each VM hosting one or more applications, running ...
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28
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getting error in azure ip configuration
I bought a centos virtual machine from Azure and installed plesk in it, I got this error when trying to define a license for my plesk,
"This license belongs to the IP address "20.1x.10x.x1 (...
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0
answers
71
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IPREV check failing on multiple ipv6 addresses
I'm using a Raspberry Pi 5b running Ubuntu to host a Postfix and Dovecot mailserver from my home. After setting up various sender authentication mechanisms on the server eg. SPF, DKIM and DMARC - and ...
0
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0
answers
62
views
Setting the same secondary public IP on multiple servers
The question concerns floating public IP's. I'm trying to set up a failover mechanism in the simplest way possible. Are there any hidden downsides to configuring the same secondary static public IP on ...
- 101
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2
answers
199
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Change netmask subnet on server due to reduced IP range allocation
I am running a few Ubuntu 22.04 servers, each with one IPv4 address configured.
Currently with a /24 network allocation, the datacenter requested some IP's back, and now I am left with a /28, which is ...
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1
answer
13k
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curl: (28) Failed to connect to X.X.X.X port 80: Connection timed out
I'm getting this error:
curl: (28) Failed to connect to X.X.X.X port 80: Connection timed out
When I run this:
curl X.X.X.X
I'm curling a specific IP address and it fails on both port 80 and 443. I ...
- 101
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votes
2
answers
230
views
Exclude local sub-net (local IP ranges)
In my company's VPN app we have a disable-able feature which excludes below List of non-web-site IP-address ranges from being routed into the VPN server.
This allows local-net Apps to continue working ...
- 103
1
vote
0
answers
114
views
How Linux kernel selects the source IP of outgoing data packets?
I have multiple IP addresses assigned to a network interface, each corresponding to a different outbound IP.
:~# curl --interface 112.73.59.255 ip.sb
157.119.73.25
Using the above command, I ...
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1
answer
526
views
Sending email with postfix on a specific IP address fails. Error 81126 with Gmail
Recently, I started to receive errors from Gmail:
host gmail-smtp-in.l.google.com[142.250.110.27] said:
550-5.7.25 [X.X.X.X] The IP address sending this message does not have
a 550-5.7.25 PTR record ...
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435
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Which ip is chosen as source ip when sending a multicast packet on a specific interface with multiple ip addresses?
I am trying to send a multicast packet on a network interface with multiple host ip addresses(lets say ips A and B). How can I specify the source ip field of said multicast packet to the host ip that ...
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1
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275
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How to block unrecognized hostnames in .htaccess (A Domain Name I Don't Recognize Is Redirecting To My Site)
I'm using Dedicated IP on a shared linux server... At first, I saw that an unfamiliar hostname displayed my own website like a mirror. I scanned the A records of this site to investigate what was ...
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1
answer
391
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Why do calls from our Google Cloud Function deployed in europe-west6 (Zürich) originate from an US located IP address?
We have a Google Cloud Function deployed in europe-west6 (Zürich), which makes HTTP calls to an API. In our server logs these HTTP calls originate from the IP address 35.203.247.36, which is showing ...
0
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1
answer
398
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Convert IPv6 from the compressed/short format to expanded format
When I execute the command ip address show my server shows hundreds of IPv6 that I have assigned to it. It works great, however the leading and trailing zeros are omitted from the IP addresses, and ...
- 316
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2
answers
222
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How to separate two IP Pools for the single LAN network
I want to create two IP pools in my private network. I want to do this so that the IP cameras in my network are separated and the data devices(PC's, AP's, IP Phones) are separated. But I'm doing all ...
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2
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284
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Should we use the LAN IP or the public IP for bind settings such as A records, etc.?
I'm a newcomer to working with bind, and a while ago, I purchased a static IP from an ISP. I used bind to bring up a domain, and now it's working without any issues.
For example: the LAN network IP ...
0
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0
answers
384
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Creating onlink route via bridged adapter unexpected behavior
I am trying to create an onlink connection between a Windows host and a Linux vm guest in VirtualBox using a bridged network adapter. The IP on the guest 10.x.x.x. The IP on the host is 192.x.x.x.
I ...
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2
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1
answer
177
views
Is SLAAC generation affected by non 64 bit size network prefix?
I have enabled all the parameters needed for the generation of SLAAC, and I am obtaining router advertisement, but the network prefix in the router advertisement is /52 and not /64. The system is not ...
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2
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228
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I have a whole ipv6 range /32 for my application. I want to use all of it [closed]
The Problem
I know how to add block to interface. But I really don't know how to use specific address dynamically.
What I want
For example:
I have a block fe80::/32 for my application.
I will let my ...
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2
answers
3k
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How to force a server to return my IP address in IPv4 and not IPv6?
Scenario
I have a tiny PHP script on a server that echoes the IP address of any client reaching it so the address can be added to the cpanel MySQL remote hosts table via the API. I call this script ...
- 103
1
vote
2
answers
956
views
How to create a static IP for pods in OpenShift?
I have an application that needs to get data from a mainframe using FTP.
Each MF account is connected to a specific IP, whenever I try to connect from the pod I am connecting through a different ip ...
Gabriel H
0
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0
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25
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Blocking WhatsApp traffic from a specific Country [duplicate]
How can a country block all WhatsApp traffic from a specific country?
