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

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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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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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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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Bridge interface - add default route

I used to connect my ubuntu 14.04 laptop on office network via eth0 and the route table gets updated with the office network gateway ip in auto mode. Now, i changed my /etc/network/interfaces ...
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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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52 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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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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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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52 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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81 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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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 ...
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yast routing problem — connect: Network is unreachable

---------------------------------------------------update----------------------- on doge the route works: thufir@doge:~$ thufir@doge:~$ route Kernel IP routing table Destination Gateway ...
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RHEL6.6 in which file you put the gateway configuration

In RHEL6.6 OS system, which file we've to put the gateway configuration? I tried GATEWAY=xxx.xxx.xxx.xxx in these files : /etc/sysconfig/network /etc/sysconfig/network-scripts/ifcfg-eth0 and I ...
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375 views

Not understanding the meaning of Genmask in linux routing table

lanix@lanix ~ $ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 10.0.0.138 0.0.0.0 UG 0 0 0 ...
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Dynamically assign outbound network interface

I'm establishing a network connection with wvdial (PPP) and I want to assign this as the outgoing network interface AFTER it is established. The connection is being established by a bash script and ...
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83 views

DNAT forwarding for FTP: No route to host

I have a single public IP for multiple VM, i need forward multiple ports for FTP service, i write these lines: iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 20:21 -j DNAT ...
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108 views

two NICs in the same subnet— need to set up routing

I have a tricky case: +---+ +----+ |D1 +->eth0---------<-eth0-+D2 | | | | | | +->eth1---------<-eth1-+ | +---+ ...
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153 views

iptables IP address (source and destination IP address) mangling

I tried to understand the concept of iptables mangling part, but somehow failed to understand the IP header manipulative section. For example: Below is the system scenario which I'm trying to ...
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49 views

Adding routes for configured virtual IP addresses of different segments

I have configured virtual IP addresses in different segments as below in RHEL box. eth0 - 192.X.X.208/27 eth0:1 - 192.X.X.219/27 eth0:2 - 10.72.X.19/24 eth0:3- 10.72.X.20/24 The problem here is as ...
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128 views

How to bridge a VM to public IP

I wish to to assign the IP from my eth1:2 to a VM; I also have no use of this IP for the host, it would be desirable to be exclusive to the VM. I've ended up with a setup just like this (eth1:1, ...
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Which path are the packets taking?

I have set up a host-only network in VirtualBox. Windows Host: VirtualBox Host-Only Network IPv4 Address. . . . . . . . . . . : 192.168.56.1 Wireless LAN Adapter Wireless Network Connection 2 ...
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198 views

How can I connect to a local computer behind a router with the router's IP address?

I am trying to set up an IPA server to be used from machines that share the same network as the server and machines that don't. The router's IP address is 12.34.56.78 I am using port forwarding on ...
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118 views

VNC connection times out

I have a VNC server running on a box but can't connect to it over the internet and I don't know why. Here's what I have: on server $ ps ax | grep Xvnc 21304 ? S 0:00 Xvnc4 :1 -desktop ...
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OpenVswitch in Linux kernel configuration

There's a kernel configuration variable Open vSwitch (CONFIG_OPENVSWITCH). This enables openVswitch support inside the kernel, but still to use it, we need a userspace daemon. My question is, what ...
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WAN interface using his own queues for QoS different that the provided by Linux

My Linux embedded system have a WAN interface with the default pfifo_fast qdisc attached to it. The web interface for configuring the system let the user configure three Queues for the WAN interface ...
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46 views

IPv6 - how to force traffic destinated for same system but another interface to pass through the wireless network?

I want to perform some IPv6 stress testing (file transfer, flooding, Neighbor Discovery, etc) on wireless routers using a system which has two network interface cards. However, all traffic goes ...
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205 views

Linux routing table entry disappears

I run Fedora 20 (3.13.10-200.fc20.i686) inside VirtualBox on a Windows 7 SP1 host. The Ethernet adapter on the guest is configured as a Bridged Adapter in VBox, and gets an IP via DHCP. Here's the ...
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29 views

How to use networks default gateway dynamically? [duplicate]

I want to use specific interface for specific use from different different application. I am using Ethernet, Wi-Fi and 3G modem interfaces in my embedded Linux set-up. Now my set-up is up with ...
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1k views

ICMP gives host an impossible redirect

I am having trouble with forwarding on a system which hosts a few headless VirtualBox VMs. I have not changed anything but the configuration has stopped working. The VMs have IP addresses on their own ...
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114 views

iptables rules - input and output

I'm new with Linux and iptables. I have a Ubuntu Server distro (12.04) on a PC which has 2 network interfaces (eth0 and eth1). I also have 2 laptops, one is plugged to eth0 and the other to eth1. ...
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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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How to route “single ip” to different interfaces [duplicate]

i have a dd-wrt router (ip 192.168.1.1) with the following network interfaces: eth0 ath0 ppp0 (a pptp vpn client) i would like to route all traffic from ip 192.168.1.10 to 192.168.1.20 through ...
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On ssh connection the auth.log shows as source IP the external IP of the server instead of the IP of the client

I have a very odd situation with my ssh connection. Every time I connect to my server, whatever is my external ip, the connection have as source the server's external ip. Example Server S.O.: ...
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116 views

DNS not resolving using IP rule for dialup modem

I am running Ubuntu 12.04. I have a HSDPA USB Modem, with which I can successfully dial in. It works fine as well when I set the default gateway (remote IP address) in the main routing table. But I ...
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Routing Application through different network interfaces [duplicate]

I have two interfaces on a server, let's call them eth0 and eth1. The underlying server is running CentOS 6.5 I would like to be able for some application to use eht0 while some others use eth1. ...
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813 views

Use iptable do redirect all the HTTP traffic to localhost

I use a Linux machine as WLAN Router with the help of hostapd and udhcpd. There's also an Apache web server installed on the same machine. Now I want to redirect all the traffic which comes through ...
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62 views

Ip connectivity with two interfcaes

I have two network interfaces in Linux machine , eth0 and eth1. IP is assigned to both interface from two different VLANs and default gateway to eth0. Now if interface eth0 is down I am unable to ...
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routing based on source IP [closed]

Is it possible to configure routing based on source ip? For example, if I have source IP 10.0.0.0, then all the traffic will go via the specific interface or would be sent to specific default gateway. ...
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1answer
40 views

iptables routing through firewall

I have a httpd service running on server machine, I have a firewall and internet browser on desktop machine. On server I have a rule that only firewall can access to server: -A INPUT -m state ...