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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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Configuring Data and Voice VLAN Cisco SG300

I have a Cisco SG300 managed switch I am attempting to configure to handle two VLANs one for data (VLAN1) and another for voice (VLAN20). Ports 1 and 52 are configured to trunk to the router/...
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Cisco Switch Port Routing

There's a Cisco 3560-24PS-S, and I need to configure it. I'm not a certified network expert, but I have some basic understanding of how the switches and routers work. The plan is to connect a BMS ...
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Squid and dynamic ip network adapter

I am struggling with setting squid proxy server to work with dynamic (3G/4G) USB modem adapter. I know that I should set tcp_outgoing_address directive to the IP of the adapter, but that is an issue ...
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OpenVPN/OpenWRT/TP-Link TLWR1043ND: How to configure OpenVPN on this router to get access to connected devices only over the WAN interface?

I have the following problem: There are two networks, network X and network Y. In network X is an OpenVPN server. A TP-Link router (see the model in the topic) should be connected to network Y only ...
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1answer
19 views

VPN Router does not reply to ARP Requests

So i have these three network interfaces setup on a linux box: eth0 is facing the external network (192.168.1.0/24) tun0 is the vpn interface (10.8.8.0/24) eth1 is the local network interface (...
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Accessing IPv6 Only Network from IPv4 Network? [on hold]

My ISP has provided me IPv6 only internet connection. If I connect from my IPv6 PC to IPv4 Internet I have no issues, because the ISP does all the IPv6 to IPv4 conversion. However, at home, on this ...
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Accessing two isolated subnets from a Linux box

I have a Linux box with two NICs, each connected to a different LAN: LAN A: 192.168.1.0 255.255.255.0 LAN B: 192.168.2.0 255.255.255.0 The routers are: RouterA: 192.168.1.1 RouterB: 192.168.2.1 ...
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routing multicast trough debian miniPC eth0->eth1

Hello i have probably noob question by i already spent some time on it and messed a local network as well so: I have miniPC for real time log purposes between network and IPTV set-top box. The box ...
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Windows 10 ICS with 2 NICs and one VPN connection

I am under an education network which the content is unfilterred but the volume of traffic to the Internet is limited (unlimited within EDU network). This restriction only applies only to office ...
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Using Fritz!Box 3490 to forward external traffic to internal servers [migrated]

I have a Fritz!Box 3490 along with 5 usable external IPv4 addresses provided by our ISP. The Fritz!Box is to replace our existing DrayTek 2925. One of five IP addresses is an MX; so we use that IP to ...
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pfsense using .x.x.0/27 as host address

On OVH I have 8 ip's, x.x.141.0-7, i.e. a /29 All 8 addresses are reachable from outside. The pfsense itself is .0 However, I can't set the netmask to /29, because pfsense say the .0 is the network ...
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Multiple IpSec VPNs in failover config - pfSense to Draytek

I am looking to create redundant IpSec VPN Tunnels between two sites. I already have one VPN operational but due to overlapping LAN IP ranges I cannot have more VPNs active at the same time for ...
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OpenVPN route client LAN to VPN clients and back again

At some point in time I had this working, but have since broken it. I need to have bi-directional traffic (routing) between LAN clients behind a CCD gateway, and VPN clients. With the below ...
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18 views

Windows Server - Redirect Traffic To Another Subnet

on windows server 2012 I have 2 network cards, one of them connects directly to the router on static ip 192.168.1.11 and that second card I have a second ip set as 192.168.1.12. From the router I ...
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GRE tunnel cant connect to it self?

the tunnel works... just not for me so ... i used tcpdump and saw that i get packets going in and through the tunnel all the way to my end point and then its as if it doesn't make it to the program or ...
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VPN server route traffic through squid for access control to websites

So I'm trying to restrict outgoing traffic to specific websites from the VPN server. I currently have Outline VPN and squid setup. I want both of those to work together, i.e; Use VPN for access to the ...
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DNS Edge Routing with LEDE/OpenWRT [duplicate]

I managed to setup a nameserver on a VM in a virtual subnet. All the machines in my LAN are Debian based. In order to get my laptop to use the local nameserver, I wrote out the following to /etc/...
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How to configure ip6 gateway routing with a wildcard

We have a number of devices that need bidirectional traffic with our servers. Each of these devices has an address prefixed by their gateway (they are IoT devices sitting on a local mesh network, ...
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Mac OS X - network interface preference defined by host domain [migrated]

There are two network interfaces on my Macbook: an ethernet LAN and Wi-Fi, which are both DHCP-configured (albeit separately). I only need to access a limited number of hosts through my Ethernet ...
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18 views

UDP multicast on a dummy NICs

I have an Ubuntu virtual machine that makes some end-to-end testing of a software. For these tests I need 3 ips in the same subnet. 2 ips should listen for udp multicast (224.0.0.50:4321) and make a ...
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94 views

Advanced routing with firewall marks and `rp_filter`

Today is routing day. You should now how to add an IP route, basic use of ip rule, and good understanding of iptables to read this. This is cross posted (in French) on LinuxFr. Problem I have an ...
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How do I route all requests from one linux server to another?

I want to route all requests from server A to server B (like a proxy) (i want to hide the ip from server B because Server A have a good ddos protection and server B not) I tryed this but this ...
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1answer
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Two ipv6 tunnels on one host

I have host with additional IP addresses. We will call them as 51.52.53.54 and 71.72.73.74 and two ipv6 tunnels with /48 subnets. Tunnel provider gives example configuration and I configured my first ...
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How can I access a VM from external network

I have a windows physical server, and I will install a CentOS 7 VM on it. I a have a VPN account that allows me to get a dedicated IP only on my host machine. What I want to do is to make my VM ...
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1answer
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how to setup 2 routers (no bridge) with DDNS [closed]

My current network setup (which works): A) ISP-provided modem/router (Main): Fiberhome HG180 VDSL w/ voip Notes: 2 RJ11 ports (1 for DSL and 1 for landline phone) 4 lan ports and NO wan port ...
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Sharing local 4g USB modem internet connection through public/remote servers IP to be used as a Proxy

After 30+ hours of research and trying different solutions I have found many solutions to each piece of this puzzle but can't quite get them to work together or figure out the best approach so I'm ...
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1answer
40 views

Connecting two AWS Peering Connections

I have an AWS Lightsail instance (deployed in AWS Managed VPC) that I want to connect to my Mongo ATLAS (deployed in Mongo Managed VPC). I was able to connect my AWS Services (Lambda, API Gateway) to ...
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1answer
47 views

how do /var/spool/(clientmqueue,mqueue,mail) work?

If - for example - cron jobs output to stdout, which is the process collecting the output and writing to these directories ? /var/spool/clientmqueue /var/spool/mqueue /var/spool/mail Where ...
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1answer
40 views

how do you reach a secure shell server connected to a virtual private network?

Simply put : Laptop running ssh and connected to a vpn. How do I ssh to it ? I get the external ip with a google search, my router forwards port 22 on the laptop and I can connect with success when ...
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Linux - how to set a default route with 0.0.0.0 as gateway

I have a problem where I need to manually set up a route on Ubuntu 18.04 during the init (ram) process. I cannot use any of the new networking tools, only Busybox is available. The routing table ...
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Add static route (default gateway) on Ubuntu 16.04 server

I have set up Ubuntu 16.04 VM server, and I'm trying to change default GW on it. (all traffic should be redirected to another gw - because of whitelisting problems). Incoming traffic will come from ...
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Routing issues with PPTP VPN server

This is my first time working with PPTP and I'm not very proficient in networking or iptables like you guys are. So, please bear with me. The desired scenario is this: A remote linux box runs pptp ...
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1answer
189 views

nginx listen on specific interface

I'm running a Nginx as a proxy server, forwarding to 10.12.96.4. I would like the NGINX server to listen on ens3:, and forward requests through `tun0 Here is my /etc/nginx/sites-available/default: ...
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Strange internet timeout issue

Working with a client, setup a new server for them 3 weeks ago. The It's a Windows 2016 server, replacing an SBS server; the domain is already setup, I had initially started to setup RDS, but removed ...
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2answers
107 views

Public traffic routed over an Amazon AWS VPN dies. Want it to egress from our corporate network

We're migrating to a new jump host, migrating from a machine in-house. We also have 100+ customers that we will still need to communicate with via SSH. Their firewalls currently allow our primary ...
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2answers
39 views

Public subnet routing

I have one public IP from my ISP 198.51.100.123/21 and a public 203.0.113.1/29 subnet routed by my ISP through the first IP. OS: CentOS 7. I want to assign each IP from the /29 subnet to a virtual ...
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1answer
43 views

Change outbound IP - centos

i have a server (linux/centos) and my default ip is: 111.111.111.111 so i bought another ip (ip failover) 222.222.222.222 if i visit in browser 111.111.111.111 or 222.222.222.222 its opening same ...
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2answers
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Connect One Linux PC to two different LAN networks (one production, one for testing)

Cable Modem (with 4-port switch) | / \ / \ / \ Router1 Router2 | | LAN | ...
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1answer
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The routing behavior of VMs in Azure is strange

I have three Ubuntu machines, machine A, B, C. I also created a VNet 10.3.0.0/16, and create three sub-net SubN1: 10.3.0.0/24 SubN2: 10.3.1.0/24 SubN3: 10.3.2.0/24 Machine A has 3 nics, eth0, eth1, ...
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84 views

proxy which sends traffic and uses dns from openvpn

I would like to set up a proxy like dante-server, which uses an openvpn client to send all trafic and dns requests. The rest of the traffic should not use the vpn! Through policy routing i already ...
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OPNSense Have SSH but no Internet or web ui

I have OPNSense running in ESXi on a DL360 G7. Here's what my console shows LAN (em0) -> v4: 192.168.1.1/24 WAN (em1) -> v4: 10.0.0.199/16 (note, it's currently getting internet ...
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1answer
66 views

Access other AWS VPC Instances but OpenVPN server

I've configured OpenVPN server on Bastion instance in public subnet on AWS VPC. Right now, I have access private IP address of that instance with my OpenVpn client, but we want to access EC2 ...
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1answer
82 views

How to set up pfSense/OPNSense on virtual host?

I'm a little confused as how to to host a *Sense box as a VM and have it provide routing for the host. Internet -> Modem/Router (bridge mode) -> en1 on Dell r710 -> OPNSense in a VM Then ...
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1answer
43 views

Can't ping 253.100.156.93 from Linux

At a remote location, there is a chinese ethernet enabled POS printer. It somehow garbled it's configuration, and its self-test now says that its IP address is 253.100.156.93, (which is inside a IANA ...
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3answers
66 views

Single IP address assigned to multiple servers?

How could one IP be assigned for multiple Domain Name Servers? For example, Google has a IPv4 8.8.8.8 with many DNS having the same address. When I make a domain lookup request to their DNS, based on ...
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1answer
32 views

centos 6.5 - Route specific domain traffic thru specific Network Interfaces (eth0:1)

I wonder if I have a VPS with 2 Network Interfaces (1.1.1.1 AND 2.2.2.2) and 1.1.1.1 set as primary ... eth0 = 1.1.1.1 eth0:1 = 2.2.2.2 Now I want to route all traffic for domain.com (I don't know ...
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44 views

Failure to ping two devices on the same subnet

Need some help with Routing. I do not understand how to make this work I have 2 Devices configured. One of the devices(somebox1) is configured with 2 interfaces and the Routing table looks similar as ...
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1answer
24 views

Route traffic between two Linux PCs with DHCP-assigned addresses

I have two Linux computers that are assigned IP addresses via DHCP by our corporate router. The two computers are also connected directly together over another network port by an optical network ...
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1answer
49 views

Manual routing in EC2 instance

I have a VPC with two EC2 instances: API Private IP 10.0.103.200 (private subnet) VPN router Private IP 10.0.103.100 (private subnet) Private IP 10.0.4.100 (public subnet) and public IP ...
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Routing between OpenVPN subnets in tunnel modes

Hope someone can help me and understand what is wrong in my setup. I have installed OpenWrt Chaos Calmer 15.05 on m TP Link router. The router have the WAN connected and a WiFi and wired subnet on ...