Questions tagged [routing]

the process by which data packets on communication networks are forwarded into the direction of their ultimate destination by routers.

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Networkd Carrier Loop And Conflicting Default Route Declarations

I got this system with 2 NICs, 4 ports on each and a total of 7 are up and used. For some reason networkd goes in a carrier lost and gained loop. One of the ports goes down, but is shown as up, no ...
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Route all TCP traffic from port to another host:port [closed]

I have a wireguard config, creating a VPN between a remote server (10.0.1.1) and my local machine (10.0.1.2), so that the server can reach the local machine and vice versa. I'd like the server to ...
winwin's user avatar
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PFSense: Subnet can not communicate to the outside

I have multiple subnets on a hypervisor with four Ethernet ports. Two are called subnets. Both of them are utilizing a NordVPN tunnel as their default gateway. The first subnet LAN can talk to ...
daniellooartist's user avatar
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Email Routing is currently disabled and not routing emails. - but... it is working

Im using cloudflare as my domain host and google business email. We have not had any noticable issues receiving or sending email, however when I logged into cloudflare today I see the error message in ...
rockit's user avatar
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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 ...
鱼鱼鱼三条鱼's user avatar
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Port unreachable when wireguard is connected

I have a server that routes all of its traffic through wireguard. When I start the wireguard, all ports listening on this server's public IP are unavailable - even ssh does not work. What I want is to ...
Iuri G.'s user avatar
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Flask or one of its derivatives: one route to handle multiple endponts that are defined in a config file?

We are using Flask-3.0.2 under Python 3.11. We want to write a highly configurable REST service which manages a few dozen endpoints whose characteristics are defined in a config file (either YAML or ...
HippoMan's user avatar
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Redirect all HTTP/HTTPS traffic through WireGuard to external HTTP Proxy

I have set up a Wireguard VPN whereby all of my devices connect to a Wireguard peer running on a computer with a public IP address (host). My Wireguard is set up so that clients connect to the host on ...
TopCat's user avatar
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UFW blocks traffic despite there is an allow rule

I have Ubuntu server with OpenVPN server running there. IP addresses as follows: enp1s0: 192.168.3.67/24 tun0: 172.18.37.1/24 OpenVPN is configured so that devices behind the VPN client are ...
Hanz94's user avatar
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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 ...
denvercoder's user avatar
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VPN netmap multiple sites with same LAN network address

I have some issues applying netmapping to a case for which I could not find much info about on the web. I am trying to set up a VPN network (server ip: 10.1.0.1) where a user (VPN IP: 10.1.0.2) can ...
Daniel's user avatar
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Debian Firewall will not forward traffic from interface x to tun0

I want to have a debian system working as a router with openvpn traffic, where all traffic on interface x should be forwarded to openvpn interface y. Following pic shows my network setup, more or less ...
kasper2083's user avatar
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Reply on same interface from which the request came?

Virtual machine with two network interfaces. Both interfaces have a default gateway. One is connected to the Intranet. The other is connected to the Internet. ...
Qmails's user avatar
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No internet connection after setuping OpenConnect server on ArchLinux

ip tuntap add mode tun dev vpn0 ip addr add 192.168.2.2/24 dev vpn0 # systemctl restart ocserv iptables -A INPUT -p tcp --dport 22 -j ACCEPT iptables -A INPUT -p tcp --dport 8443 -j ACCEPT iptables -...
Dmitry Bubnenkov's user avatar
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Dockerized http services are not accessible from nordvpn meshnet

I am setting up a home server (using ubuntu server 22.04) with several services deployed on various ports. For example, my homepage server is deployed on port 3000. When on the local network: Ssh ...
matthieusb's user avatar
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ocserv VPN with 2 NIC CentOS6 routes

I have a working installation of ocserv 0.12.6 on an old CentOS 6 machine with 2 physical interfaces: eth0 (192.168.10.155) and eth1 (192.168.0.190). eth0 has a manual configuration and uses default ...
minicooper's user avatar
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Routing with an Allied Telesis switch and ARP bottleneck

I use an Allied Telesis x610/24-Ts switch as a central switch in a company building. The central switch connects several edge switches and also provides routing between VLANs. The forwarding ...
Jerry Xia's user avatar
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What is systemd "refresh-policy-routes" [AWS Linux 2023]?

I'm trying to find the cause of an instance outage, which seems to be from a scheduled systemd refresh-policy-routes service, followed by a 404 Error call to EC2RoleProvider. After the error, all ...
Josh Hibschman's user avatar
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Routing with ipsec tunnel

We are trying to determine how to route traffic from our office 1 worker subnet through the office 1 server subnet over the IPSec tunnel to our office 2 server subnet. We want the office 2 worker ...
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Mikrotik cloud router with vlans routing

I have a MikroTik router configured with 30 VLANs, all passing through a trunk via a bridge. The router provides internet access via three PPP links with load balancing, and also local services to ...
mohamed barakeh's user avatar
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Interpreting a route that does not specify a gateway

The following line is part of the output of ip route show 10.244.0.0/24 dev kube-bridge proto kernel scope link src 10.244.0.1 The above route has no gateway specified. Does this mean all it does is ...
shintuku's user avatar
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Dhcpcd not assigning IPV6 address to LAN Interface

I am trying to use Raspberry Pi Zero 2 W as an IPV6 router having a debian based os. I have a usb wifi adapter (Interface Wlan1 ) facing wan . The inbuilt wifi (Wlan0) is facing LAN with hostapd ...
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How to 'rename' IPs in a subnet while they go through WireGuard?

first question here, I hope I'm at the right spot. I have successfully configured WireGuard on my Linux server and am able to connect my laptop to it. The laptop is able to access a subnet that's on ...
samvv's user avatar
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Routing setup with nmcli does not seem to work correctly

I have an ec2 instance with 2 interfaces (ens5 and ens6) attached both using the same subnet. ens6 has a private IP assigned along with eip. I am trying to route out this interface but seems ...
Andy Smith's user avatar
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1 answer
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Can two LAN networks both at one level behind a router higher up the routing chain use the same subnet mask and network ID? [duplicate]

Can two LAN networks both at one level behind a router higher up the routing chain use the same subnet mask and network ID? See the diagram below. This question was already answered here, but I am ...
riverofwind's user avatar
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2 answers
88 views

Ip routing two subnets

I've got two subnets A: 192.168.2.0/24. Within A we have got a firewall and a connection to the internet. B: 172.16.12.0/24. They are connected with each other via a switch and both subnets are ...
Nils's user avatar
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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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Route between ip adresses on same interface

I have on my linux host several vitualbox machines and one docker machine. Docker created the default network interface docker0 with ip=172.17.0.1/16. To connect vbox machine to the docker one I've ...
misterx527's user avatar
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Ping from a network namespace to another EC2 instance not working without NAT rule

I have the below setup. I have setup two EC2 instances. I have added the security group rules on both machine to allow ICMP traffic and both can ping each other. On one machine I have created two ...
thunderbolt's user avatar
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1 answer
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Routing webserver access between LAN and VLAN

I have a LAN set up with IPs 10.0.0.X and a VLAN with 10.147.18.X (Zerotier) and I have a webserver (Plex) that is accessible within the VLAN. I have a ubuntu 22.04 pc connected directly to the LAN ...
Bill's user avatar
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Configuring 2nd and 3rd NIC on Ubuntu 22

I'm trying to install 2nd and 3rd NICs on a Ubunutu 22 VM running on VMWare. At first setup new VM with 1 NIC - that was successful and able to go out to internet: network ethernets: ens160:...
user212398's user avatar
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AWS EC2 networking

I've been trying to understand how exactly networking works for EC2 instances, more specifically I'm coming from on-prem infrastructure where I had dedicated networking devices (switches/routers) ...
talematros's user avatar
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1 answer
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Multiple server processes on a Multihomed machine with one process bound to 0.0.0.0

I develop a data broker service that repeats individual device data onto multihomed IP addresses on a single interface. Each repeat server is a separate process bound to a specific TCP IP and port (e....
falon89's user avatar
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2 answers
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S2S VPN on AWS EC2 - routing issue for VPC

I'm trying to prepare VPN setup from scratch. I used Terraform + AWS + Strongswan. Basic diagram is attached here: AWS diagram, S2S VPN So I have VPC_left: 172.32.0.0/16 with subnet_left: 172.32....
Frumbar's user avatar
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Configuration to remote-site networking

Sorry if I miss some things or are unclear, I'm a bit noob in network. We have this configuration of network: I can't change local IP of remote site machine. I can't use IPV6 because of software that ...
Maxime's user avatar
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Route traffic to the Softether server via it's own vpn gateway

I want to route traffic to the Softether server via the VPN gateway. It may sound foolish, but for security reasons, some ports on the server have to be accessible only with the server's public IP ...
stingy64's user avatar
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1 answer
52 views

How do I set up multiple networks to 1 computer with 4 ethernet cables with quad-nic (IS SOMETHING POSSIBLE?)

I'm not going to act like I know what I’m doing because obviously, I don’t. Complete n00b here. So let's start with this. I have 4 networks. All 4 have their own router and switch. Mega Computer has ...
Junior Oh's user avatar
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Use Windows as a router

I need a client application to connect to a server in a different network. Another computer is connected to both networks as shown here: Client Computer ...
Maxime's user avatar
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1 answer
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How to route traffic from private LAN to specific public remote host via alternate gateway?

Overview I am trying to deal with the following scenario: +------+ (Internet) 50.a.b.c +---------+ | edge + eth0 <-----------------------------> + outpost | +--+---+ 25.u.v.w ...
risclr's user avatar
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IPsec tunnel gets connected, Phase 2 is successful but no IP adapter is created thus tunnel does not work

I am trying to establish an IPsec tunnel between my virtual server and a customer's server. The IPsec tunnel gets established successfuly in Phase 2, but no IP gets added to my system. This is the ...
Hanz94's user avatar
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nginx rewrite should be a loop

Is chatGPT bullsh!ttn me, or am I missing something obvious? This is my question: I have an nginx location block like this: location / { location ~ \.html { # First send it back to ...
asimovwasright's user avatar
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MIKROTIK ONE LAN - TWO WAN - TWO GATEWAY how to dispatch internet trafic depending on PC's gateway

On the LAN there are two configured type PC. All PC belongs to the same network (ie : 192.134.234.0/24) but there are two different gateway: 192.134.134.253 et 192.134.134.254.Each of them are ...
felix34's user avatar
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Default gateway setup in different networks connected through intranet service

How do I setup default gateway on two different networks connected to a third network (home office) through a provider? the provider provides intranet service. The two sites need access to internet ...
Sakadude's user avatar
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route to VPN network

I have a VPN question and hope there is an answer in the ether. :-) My setup so far: (layer 3) OpenVPN Server: NIC eth0 10.85.202.20 tun topology subnet server 10.10.16.0 255.255.240.0 route 172.16.0....
T McTrain's user avatar
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send Windows Sandbox network traffic through host VPN connection

I want to run an application in a Windows Sandbox. The application must contact a server only accessible through the host Windows PC VPN connection. But Windows Sandbox network traffic only uses the ...
JamesThomasMoon's user avatar
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systemd-networkd: add second gateway for the second public ip

What is the recipe for adding a second gateway/route for the second public ip that the machine has for systemd-networkd (on the single interface that is used)? This is Alma9/systemd-252 L.E. to ...
Adrian Sevcenco's user avatar
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When I create a bridge and make my ethernet port the bridge's master, what device does the kernel use for sending and receiveing

If I create a bridge and set its master to my ethernet port, how does the kernel send and receive packets? # Create the bridge ip link add name br0 type bridge ip link set dev br0 up # Make eno1 the ...
djshaw's user avatar
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How to Set Up a Server to Route Local and Global Requests to Different Web Servers (Server1 and Server2)

I have 2 Servers (Server1 & Server2) where is each one should have a web application on its own and I have a centralized server (for example DNS Server) The Centralized server receives a URL ...
Hassan Bosha's user avatar
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converting ip to netplan

I'm trying to convert a set of ip commands to a netplan configuration. I haven't had any luck so far, and I'm not sure why. My script for creating the bridge is: # Create the bridge ip link add name ...
djshaw's user avatar
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1 vote
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Prevent routing loop with FwMark in Wireguard

I want to set up a VPN server so that the VPN connection is used only when accessing resources within the server. Normally, I'd do this by using the server's internal IP, but I want to use the domain ...
Asher's user avatar
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