Routing (in IP-based networks) is the process of selecting paths in a network along which to send network traffic.

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2 ip ranges / 1 nic OR why does one ip range follow default route before local routes

Updated at the bottom I'm using Centos as a router, and just replaced the routing system at work. I've got 2 routers to send data around. For the most part it's working. On one router I have 2 ...
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1answer
389 views

Firewall/routing rule in Centos for this setup

I have two ethernet interfaces, namely eth0 and eth1. I want to implement an advanced routing rule but I am totally new to firewall/routing rules in CentOS. Here is what I am trying to do: Both my ...
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137 views

Unable to access internet if wireless enabled

The following is my route output. eth0 is my wired network and eth1 is my wireless network. Only wired one has access to internet. If I enable wireless, I am not able to access internet, it tries to ...
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1answer
1k views

FreeBSD and StrongSwan routing issue

Good day, gentlemen. I have recently faced a problem when a device connected to the FreeBSD server via StrongSwan can't route outside its subnet. Let me explain in details: FreeBSD 10.0-RELEASE, ...
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1answer
120 views

Help translating this `ip` command to `route` command in `post-up` hook

I am having trouble getting a static routing ip command to become permanent by way of the post-up hook in /etc/network/interfaces. Here are the relevant details: /etc/network/interfaces # The ...
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139 views

Tools for Debugging Routing Tables on a Linux Machine?

Is there a tool that debugs routing tables on a Linux machine? I mean one that I can use by inputting an ip address into it, it'll take the existing routing table into account and output the ...
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690 views

Linux tun interface packet routing [closed]

I have questions on the ip packet flow for the following scenario. The scenario is : A tun0 (10.0.0.2/8) interface and a physical wireless lan card wlan0 (ip address not fix) on the client side, ...
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1answer
42 views

Adding a route with time-limited validity?

I have read different routing protocols, each one adds routes with limited time validity to routing table. Is there a method in Linux/Ubuntu, without installing any routing daemon, to add a time ...
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1answer
125 views

Testing a Linux router on Laptop with one NIC [closed]

So, I have these instructions on converting my Linux machine to a router using (enable IP forwarding, NAT). Now my laptop has only one NIC and I want to test this setup. Any ideas how I can do this? ...
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2answers
110 views

Routing Configuration sending some traffic over VPN

I have a DD-WRT router with an OpenVPN service configured. I'd like to send only certain source IP's over the vpn connection. I believe my current routing table (as seen with netstat -rn) sends all ...
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1answer
79 views

Splitting port/IP-bound traffic between interfaces

Similar to this request (I think) I'd like to see traffic bound for a certain port number routed through one specific interface while traffic for a specific IP is routed through another. The server ...
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147 views

IPv4 broadcast routing in Linux

I have a server with three network interfaces- loopback interface lo and two physical network interfaces eth0 and eth1: 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN ...
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92 views

Default Route in ip route

I'm trying to setup an IP based route in DD-WRT using DD-WRT v24-sp2 (12/22/14) giga. Instead of only sending traffic from 10.13.37.0/24 to the tun1 VPN, all traffic is going there. Below is the ...
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2answers
137 views

IP routing to domain

I have a remote device that sends data to an IP address through a specific port. The problem I want to solve is that I need it sends data to a domain, but device only allow set IP addresses. I want ...
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1answer
285 views

Route OpenVPN clients to another different OpenVPN server

I have this scenario.. Server(Primary) with a multiple OpenVPN connections (so server is connected as a client to multiple OpenVPN servers.. lets say secondary servers) This server runs OpenVPN ...
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1answer
66 views

iproute command: ip -6 rule show nothing even with kernel option IPV6_MULTIPLE_TABLES=y

I want to enable my linux 3.2.4 to have ipv6 multi-routing table functionality. I enable IPV6_MULTIPLE_TABLES when make menuconfig and rebuild kernel.(Also with ip advanced routing and ip multi table) ...
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159 views

Linux routing tables

I'm trying to learn Linux routing tables and ran into bit of snag. In the example below I'm not sure what is happening. My understanding is 0.0.0.0 means that for line 1 and 2 any packets outside of ...
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1answer
204 views

Why won't my computer connect to my Linux access point?

I'm setting up a Raspberry Pi as a proxy access point which accesses the internet via my USB tethered smartphone and is connected to my Windows PC via Ethernet. The internet works fine on the Pi, but ...
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676 views

solaris netstat -rn output clarification

We have couple of servers performing the same function. On some I see following output: Routing Table: IPv4 Destination Gateway Flags Ref Use Interface ...
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1answer
174 views

How to automate route commands

For some reason everytime I connect to my VM I have to manually launch these two commands for it to connect to the Internet. route add 198.245.49.254 dev eth0 route add default gw 198.245.49.254 Is ...
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1answer
271 views

Squid not forwarding my packets proxied from iptables on router

I am trying to make openwrt's iptables from my router to direct to my squid proxy on my machine (since there is no enough space in router's flash memory) but even if I have my squid config ok ( ...
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2answers
567 views

SSH connection does not work while browsers do

I have the following network layout: Internet comes true fiber optics to modem. From modem LAN cable goes to router. Since that router wifi signal is weak, a LAN cable goes to another router from ...
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6 views

How to use RTNETLINK in kernel module/kernel space to extract routing table?

I want to extract routing table information in kernel module using Netlink sockets? Is it possible? I know that in user space we can do that. Regards
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26 views

Possible to route all LAN traffic through router configured with my VPN service?

I have a paid VPN service (mullvad) and I wondered if it would be possible to route all my WAN traffic mullvad's VPN via an Asus RT-AC66U wireless router running DD-WRT v24 sp2. I guess what i'm ...
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1answer
18 views

Add a route permanently to mac

I connect from a Mac running PPTP VPN to a synology box VPN server. Connecting works great, but in order to access the the drive shares, I need to run ifconfig and then sudo route add -net ...
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35 views

Prefer wired over wireless for local subnet using NetworkManager

My wireless network is bridged to my wired network, so both have the same subnet. How do I tell NetworkManager to give the local subnet route on the wireless interface a higher metric than the route ...
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26 views

openvpn: iptables not forwarding

I have the following topology: And I'm following the iptables rules listed on https://community.openvpn.net/openvpn/wiki/BridgingAndRouting Here's the output of iptables -L -v Chain INPUT (policy ...
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16 views

Routing Traffic to IPSec

I set up an IPSec/L2TP connection. It operates in transport mode and the server acts as a gateway to the network behind the server. You can see my configuration here. I think I have a routing problem ...
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2answers
21 views

routing problem - arp

I have a computer that should connect two networks: 192.168.0.x and 192.168.1.x 192.168.0.x is reachable through interface tun3 while 192.168.1.x is reachable through interface virbr1. It seems ...
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11 views

AODV Routing protocol on Raspberry Pi model B?

is it possible to run the AODV routing protocol on rpi ?
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1answer
82 views

Routing tables with two network interfaces

When I try to access the internet with my raspberry pi via ethernet, it works, but when I do ifdown eth0 and try to ping any server outside my home network, it tells me connect: Network is ...
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1answer
42 views

Problems setting up Ubuntu Machine as a router

I have been at this for over 24 hours, here is what I have so far. -I have an Ubuntu Server running version 14.04.2.amd64, called SV-01 -SV-01 has two NICs. ETH1 is for the external network (goes to ...
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32 views

redhat 9 persist default gateway

We changed the IP addresses of our RedHat 9 system that controls a conveyor/sorter system. When originally installed many years ago someone chose 192.0.0.10 as the IP! But for some reason it defaults ...
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37 views

Trouble switching between wired/wireless networks with Fedora 21

I have a Gb/s wired network and a much slower wireless on my home LAN. I switch between them in the course of my day. I have always found that Linux is not particularly clever about using the wired ...
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1answer
37 views

Fully transparent DMZ

I'm trying to configure an openwrt router so that I get two wan IP addresses by dhcp - one for the router itself and one for a DMZ host. I followed the DMZ howto. It appears that the host on the DMZ ...
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33 views

Route dies on Ubuntu 14.04.2

So I have this routing setup in EC2 on a Ubuntu machine: 10.50.0.0/24 dev eth0 proto kernel scope link src 10.50.0.163 x.x.x.x via 10.50.0.80 dev eth0 proto static y.y.y.y via 10.50.0.80 dev ...
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1answer
41 views

How to route the traffic from machine 1 to machine 3 via machine 2 and vice versa, on the same subnet?

I've a Citrix Xenserver where I'm running VMs. I have three VMs there, and they have 2 NICs each: eth0 is my company LAN which I'm using for management, and eth1 is a "single-server private network" ...
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1answer
46 views

Lab environment for testing routing in a Unix environment?

I know there are tools such as GNS3 and Packet Tracker; but the big problem with these tools is they do not work with open source tools such as OpenBGPD and BIRD. So, this leads me to the question; ...
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1answer
35 views

routing/bridge issues

im having troubles with raspbian (raspberry's debian) while trying to route two networks. My network configuration is this (/etc/network/interfaces): auto lo iface lo inet loopback auto eth0 ...
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1answer
270 views

NetworkManager changes default routing policy

I have a machine with a built-in NIC (eth0), which serves as a DHCP server for a Raspberry Pi. I also have a USB 3G modem, which shows up as ethernet device eth1. eth0 has the static ip 192.168.100.1 ...
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1answer
46 views

Route a port through a network interface

I'm using OpenVPN on Ubuntu Server to connect to my VPN. That network interface is tun0. All traffic currently goes through the VPN. I'd like to exclude traffic that goes over a specific port, and ...
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200 views

strongSwan routing issue with roadwarrior behind NAT

Using the following ipsec.conf configuration: conn %default ikelifetime=60m keylife=20m keyingtries=3 rekeymargin=3m keyexchange=ikev2 ...
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multicast routing (forwarding) using mrouted from OpenVPN tap interface to LAN

Brief network diagram: Host "S" < Tap OpenVPN > Host "C0" < eth0 > Physical Switch < eth0 > Host "C1" According to mrouted document, it doesn't need to config anything for receiving ...
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38 views

How to add routes multiple times in routing table?

Need to add same route multiple times in the routing table, or is there a way to maintain references in the routing table entries ? (may be with different priorities etc.) Am working on a switch ...
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1answer
151 views

VPS: How to forward traffic to devices from public IP

My goal is to set up a public IP for a Android Smartphone which is running an "IP Cam" software - the interface can be accessed in local network on (example) 192.168.0.2:8080 - But it has no public IP ...
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37 views

Linux as a router

I'm wondering whether this would be possible with linux and how ... I've got a normal DSL connection and 3 VPNs - I'd like a Linux computer to connect to all connections (maybe through a DSL Router or ...
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157 views

How to setup routing tables to connect two subnets

How do I setup my routing tables to allow traffic between two subnets I have a gateway box with two NIC's 1st NIC [eth0] is connected to my outgoing network side and DSL modem and has subnet ...
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1answer
86 views

Redirect traffic through the server

My task is to redirect traffic (port range) through the server. Here is the schema: Why NAT is not appropriate here: If NAT is set to "Tunnel Server", then all users will be assigned the same IP. ...
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1answer
220 views

Switching between Network Interfaces

I am trying to write script to switch between two interfaces on a Linux machine, wlan0 and eth0. My primary reference is: http://askubuntu.com/questions/338100/forwarding-traffic-between-2-interfaces ...
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31 views

Forwarding packets through a host

I've setup a Site-to-Site network using this How To This How To fits exactly what I need. But I've a problem. From site wich hosting the OpenVPN AS server (site 2, right in the howto) I can't ping a ...