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

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Meaning of address netmask without route to subnet?

My understanding is that the netmask of the interface tells what subnet the interface belongs to. Meaning of this information is that the routing system knows that packets to this subnet should be ...
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How to define different routes for global and non-global zone to the same destination?

I have the requirement to separate the management network for global and non global zones in a Solaris 10 server. The global zone has its own management network and all non-global zones share their ...
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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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49 views

Rewrite source IP in TCP replies using iptables

I'd like to rewrite the source IP on TCP/514 traffic leaving a redhat machine, for connections that weren't initiated from the machine. The machine receives TCP/514 traffic on an interface, for ...
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1answer
29 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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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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How can I use Linux as a Gateway?

NOTE: If client devices (computer B in this example) want to obtain internet through the gateway computer, maybe they still need to configure nameserver resolution. This is not explained here ...
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37 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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32 views

OpenConnect: Setting default routes

I'm trying to use OpenConnect to connect to my company's Cisco VPN (AnyConnect) The connection seems to work just fine, what I'm not understanding is how to set up routing. I'm doing this from the ...
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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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19 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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Routing only VM traffic through VPN

I'm stuck on a problem and would like some help if possible :-) My goal is to make my VM going through my VPN connection and my HOST through the standard gateway. Configuration : VM (192.168.100.1) ...
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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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How to drop packet if conntrack entry not present

Is there a way to check if conntrack exists before doing a particular action in iptable chains ? I would like to drop the packet in mangle-postrouting if conntrack entry is not present, dont want it ...
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AODV Routing protocol on Raspberry Pi model B?

is it possible to run the AODV routing protocol on rpi ?
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1answer
84 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
43 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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77 views

Iptables exception for specific port

I'm new to iptables but configured a simple natting today on my raspian: # Always accept loopback traffic /sbin/iptables -A INPUT -i lo -j ACCEPT # Allow established connections, and those not ...
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Howto configure linux router to allow clients to use maximum bandwidth?

The problem is that I'm always limited on the final client machine to about 1/3 (one third,about 200/300kb) of the internet hotspot bandwidth when testing download speed with wget. I have configured ...
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bash command/script to reset default route

I manage several OpenWrt (embedded linux) routers for which I've written bash scripts to run an Openconnect VPN client. The client uses "vpnc-script" to set up routing, which replaces the initial ...
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1answer
36 views

Routing problem from internal eth1 interface to an external ppp0 interface

I'm trying to connect two LANs using a ppp link. I had a basic network topology diagram but it didn't come out well. This can be seen here. Routing Problem ================ 172.20.0.0/16 ...
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246 views

Error when redirecting ports with iptables: No chain/target/match by that name

I am trying to redirect all incoming TCP connections, originally to port 80, to port 8090, because I am running Confluence in 8090 and I want to avoid it running as root, which is a requirement to ...
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1answer
29 views

Packets not forwarded due to second routing table

I've just spent about an hour trying to understand why my docker containers couldn't connect to the internet, in particular couldn't resolve any DNS names. By now I've found a workaround, but I still ...
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Bind unix program to specific network interface

Question: How do I launch a program while ensuring that it's network access is bound via a specific network interface? Case: I want to access two distinct machines with the same IP (192.168.1.1), but ...
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Linux Routing Question

I was wondering how it would be possible to have multiple IPv6 default gateways on CentOS linux. I currently have two interfaces with IPv6 (venet0 and tb0), both with different blocks routed to them. ...
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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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NAT box with multiple internal and external interfaces

Similar questions have been asked before but my setup is a little different and the solutions to those questions are not working. A have a CentOS 6 server running iptables with 5 interfaces: eth0: ...
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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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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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IP packet forwarding in Debian

I have a physical network set up with machines A←–→B←–→C.  IP and Ethernet configurations are summarized as following: A(eth0: 10.10.10.2) ←—→ (eth0: 10.10.10.3)B(eth1: 192.168.0.3) ←—→ (eth1: ...
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routing table “220” in Linux kernel 3.2.0-23-generic

I have a Linux machine with kernel 3.2.0-23-generic and it has rule with priority 220 in RPDB which points to routing table named "220": T42:~# ip rule show 0: from all lookup local 220: ...
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routing cache in latest Linux kernels

As I understand, routing cache was removed since Linux kernel 3.6. In systems with older Linux kernel one could view the content of the routing cache with ip route show cache command and routing ...
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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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ip rule not acting on fwmark

I'm trying to use iptables to load balance web traffic over multiple DSL lines by marking the packets and routing based on the mark. I'm working with CentOS 6.6, Kernel 2.6.32-504.16.2.el6.x86_64, ...
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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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Routing table and multiply hops

I have 6 networks, I need to connect network 1 and network 5 via five routers. What’s the command to set multiply hops? ip route add IP_address/mask via IP_adrress dev eth0, but how do I set next hop? ...
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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
284 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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49 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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112 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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206 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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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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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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Separate Network Traffic on Two Network Interfaces

I am not an R&S professional, so much of that realm of computing escapes me. Could you lend your expertise in helping understand how to go about configuring the separation of network traffic on ...
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1answer
129 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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Why is my traceroute hitting the wrong gateway?

What "Should" Happen I want traffic to Google to go through en0 (Mac) and hit gateway A (let's say IP = 123.456.789.000). I have another route setup for en3 and I don't want to mess with that. Tried: ...
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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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Port forwarding with iptables and PIA VPN for single user

I've gotten a Private Internet Access VPN setup on a Mythbuntu 14.04 machine and I am at wits end trying to get port forwarding working with rTorrent (and ruTorrent). My setup is rTorrent running ...