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

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Is it possible to prevent eth0 network traffic from accessing eth1 network?

I am not really sure how this is possible but I have a linux(ubuntu 14.04) box with 2 interfaces. eth0 is connected to our lan 192.168.0.* and eth1 is connected to a dlink wifi router on network ...
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iptables routing

I believe this question has been answered a 100 times before, but I'm almost sure that I'm searching into the wrong direction. My desired setup is the following: I have a virtual host using KVM and ...
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Essential tasks of a routing daemon in Linux [closed]

What I have understood so far from some software router projects already there (e.g. bird), there are some essential subtasks for routing in Linux. Task 1: Get a routing table first (using ip route ...
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ISC DHCP Server - A Client's Uplink Is Not Working

Running a DHCP server, client(s) does not have up-link (0Mbps) and has a downlink (50Mbps.) I am setting up a gateway/router on a PC running Debian Wheezy with ISC-DHCP. I have 1 WAN (eth0) and 2 LAN ...
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ip route match multiple fields

I have a Linux machine set up to forward IPv4 packets. I'm looking to do this: if packet matches both source and destination, forward to GW X. How do I specify the source field? Do I need to use ...
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Packets sent through TUN interface not routed

I have a C program attached to a TUN interface. In my C program, I'm building packets and writing them to the TUN interface. Now to check if packets are really sent from my TUN interface I use ...
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1answer
85 views

Setting up a gateway between two subnets on the same physical network

I need to configure a DHCP-enabled network (192.168.2.) on a physical layer where resides an already existing network (192.168.1.) with static IPs. I have a Debian 7 server with two interfaces (server ...
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237 views

Routing a LAN through OpenVPN on OpenBSD 5.5

I'm configuring an OpenVPN gateway to allow a LAN access to the internet through the tunnel. The gateway is running OpenBSD 5.5-stable amd64 on the PC Engines APU platform. The LAN contains re1, re2, ...
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Iptables not forwarding. Input instead

I have set up iptables on my ubuntu headless server: iptables -S -P INPUT ACCEPT -P FORWARD DROP -P OUTPUT ACCEPT -A INPUT -s 10.1.3.90/32 -i eth0 -j LOG --log-prefix "INPUT: " -A INPUT -i eth1 -j ...
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Port redirection on loopback with IP other than 127.0.0.1

I want to redirect port 80 on the loopback network interface so that accesses to that port actually go to port 8080. I tried using the following command, but it only works if the application is ...
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382 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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178 views

Conntrack TCP Timeout for state stablished not working

Im using a private IP address and I want to keep alive SNAT entries in my Router (Gateway) for at least two hours (some windows apps of my network are using TCP keepalive set to 2 hours). Gateway is a ...
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46 views

How to use one nic for storage traffic & other for network traffic in Linux(Slackware)?

Problem I have a Linux machine (Slackware) with two network interface cards and i want to use one interface for network traffic and other for storage traffic . As this is Slackware i dont know this ...
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1answer
80 views

tcp/ip - trigger action or event after period of no network activity on certain port(s)

Is it possible, perhaps using iptables or one of the wrappers/frontends to iptables, to trigger an action or run a script after a certain period of time has elapsed with no network activity on a ...
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393 views

How to redirect tun SSL VPN through HTTP CONNECT proxy, using iptables?

I use a VPN under SSL solution (Firepass) on Android. VPN opens an SSL connection on port 443 of remote VPN server. My mobile carrier doesn't allow direct connections on port 443 but allow SSL ...
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458 views

Understand the Route table

I just setup the OpenVPN and it is working as expected. However, the routing table of the client is confusing me to no end. Here is the route table: # route -n Kernel IP routing table Destination ...
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Different routing for each address on an interface

I know I can add several IP addresses to an interface without using interface aliases (ex.: eth0:0). My question: but how can I create different routing decisions for the different IP addresses on ...
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353 views

OpenWRT configuration when router is in bridged mode

I am planning on putting my Zyxel ADSL modem in bridged mode and use an OpenWRT router instead as the exit point from my local network. So, what protocol must have the Wan interface if the router is ...
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Linux Source Routing with one gateway

I've a Linux box which have IP 10.1.1.100/24 on eth0 with gateway 10.1.1.1 and as well as 20.1.1.1 on eth0:1 and 20.1.1.2 on eth0:2 . Is there any way that I could communicate to a remote machine ...
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invisible bridged router with 2 route table

my setup I have 2 ISP connexion : ADSL and SDSL. A qos (named qos, ip : 192.9.201.252) server stands before the ADSL router. It is the only way to access the ADSL gateway (192.9.201.254) through a ...
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How to send packets coming from a second router on a particular port back to the router, using iptables not a route

I have a Linux server which runs a particular service listening on a single TCP port. The Linux server connects to the internet using a PPP connection and also acts as router for a local network using ...
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435 views

Route outgoing traffic to different gateway based on port

I am trying to get around my Usenet download bandwidth restrictions based on IP. I currently have two IPs from my ISP to double the download speed. So far I have it working and getting double speed ...
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complex dd-wrt routing setup - is it possible?

I have access to my university's VPN through OpenVPN, and would like to extend it to all the devices at home. I have cable internet, a DD-WRT router, a bunch of clients (mostly Windows), and a ...
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134 views

Managing iptables for home lan routing

I have a LAN at home. One Netgear router - 192.168.0.1 connected to the internet. One Macbook - 192.168.0.10 (connected to Netgear router) One PC with Kali Linux - 192.168.0.20 (connected to ...
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SSH to a machine that is getting it's network connection from an Android device(Google TV)

I have a Linux(Ubuntu) machine for my HTPC. It's running XBMC and I control it via my IR remote control. I don't have a (wired) keyboard to control it. It has Wifi adaptor but it's not installed. I ...
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iptables one IP through another network interface

This question is very similar to what I am trying to do: iptables --set-mark - Route diferent ports through different interfaces However I attempted to follow the answer but I was unable to make it ...
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2answers
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Using a specifing gateway for a packet. (CentOS/RHEL)

I have just setup a machine which has two NICs, one for private network and the other one for public network which has a real IP assigned to it. DEVICE=eth0 HWADDR=XXX TYPE=Ethernet UUID=XXX ...
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Network in LXC not forwading through a bridge

I've got an LXC container, on the host I've got a bridge between the LXC container and eth0. The LXC container can ping it's Host 10.1.0.5, but can't ping the gateway of 10.1.0.2. The host is able to ...
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Network not working after fiddling with webmin

Can some please help me restore my networking? I have a VPS CentOS 6.3. Few minutes ago it was working well, Except I couldn't connect to the Yum repository. So I thought I could change some settings ...
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2answers
143 views

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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Debian, two network cards - “no route to host” on eth1

I have added a secound nic in a debian box. That nic is ment for doing some test stuff, so those devices connected should just be able to access the debian box or be accessed from it. To set up the ...
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316 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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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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479 views

Wrong route taken on a network with two gateways [closed]

In the following output, why does vpn1 route pings to 10.100.0.1 instead of 10.100.0.112? 10.100.0.1 is a network gateway with no NAT; 10.100.0.112 is a dual-homed host with NAT enabled. root@vpn1:~# ...
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Is /etc/resolv.conf needed when using a static IP address?

I am trying to configure the IP address of my embedded device. The device should have a static IP address and I attempt to set this using the /etc/network/interfaces file with iface eth0 inet static ...
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1answer
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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
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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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1answer
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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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1answer
54 views

Trying to connect to gateway in static ip network

I have arch-linux-arm running on a raspberryPi. The network I am in uses static IPs. gateway IP is 192.168.178.5 IP for my device is 192.168.178.201 To connect to the internet I use: ip addr add ...
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1answer
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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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4answers
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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
101 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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1answer
129 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
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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
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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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1answer
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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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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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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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routing based on source IP - a continue [duplicate]

Following my previous question routing based on source IP The source IP floating one and assigned to a cluster (consists from 2 servers). Let's say that the physical IP on server1 is 10.0.0.1, on ...