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

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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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103 views

Packets do not cross IP tables Postrouting when originating from an external IP

I'm trying to reflect traffic from the internet to an internal device that I only want to have local access. I have a host in my DMZ that I'm trying to DNAT traffic to this internal device, and SNAT ...
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179 views

Traffic getting routed through Apache

for some reason, certain outgoing traffic on my server gets routed to the apache webserver i am running. this problem just started happening. i have the webserver set up to use vhosts, the webserver ...
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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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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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148 views

Routing traffic for specific user to specific interface

I have a Linux box with these interfaces: eth0 Link encap:Ethernet HWaddr 14:da:e9:ef:75:7d inet addr:176.9.85.182 Bcast:176.9.85.191 Mask:255.255.255.224 tun0 Link encap:UNSPEC ...
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137 views

Making static routes persist after a reboot

I have two VLANs (default vlan and vlan 5 for voip). I have 2 interfaces, one for each VLAN. My route table looks like this right now: Destination Gateway Genmask Flags Metric ...
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122 views

Default iterface/routes metric in Linux

When I run ip route on my Linux machine, I see default via xxx.xxx.xxx.xxx dev eno1 metric 202 I wonder, where this 202 metric is configured and what other ip commands use it.
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Network connectivity trouble to non-routing multi-homed hosts?

I have two networks: A and B (172.16.2.0/24 and 172.17.2.0/24). A is Ethernet, B is WiFi. An OpenWRT router connects A and B, and most traffic gets passed OK. Default route on router leads to a ...
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750 views

How do I route bittorrent through a second interface?

I've managed to configure openvpn on my DD-WRT router such that the tunnel is up and working, but that it doesn't mess with routes at all (the default configuration wants all traffic to go through ...
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92 views

Transparent Proxy

I am setting up attempting to set up a transparent proxy on CentOS using Squid. So far I have managed to filter the content and get it working perfectly. The only issue I am having is getting a form ...
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125 views

Configure routes to access WAN and LAN through diffrent interfaces

In my organization. Some useful technical websites are blocked by the firewall. In my machine i got three interfaces eth0, wlan0, wwlan0 eth0 Link encap:Ethernet HWaddr 00:9c:02:93:b1:b4 ...
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2k 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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313 views

SNAT problem in iptables

I am trying to reroute traffic from specific devices in my house over openvpn. For this, I've created an OpenVPN tunnel between my house wifi router and my server. Here is my setup: Wifi router's ...
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1k views

Adding multiple gateways for separate physical interfaces with various metrics/priorities

My system has 3 interfaces. These are eth0, eth1 and usb0. eth0 is linked to my router and is the line I want to be used by default. eth1 is un used. usb0 is a 3G phone that's tethered. My issue is ...
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223 views

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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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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43 views

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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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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94 views

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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220 views

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 ...
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Route wireless LAN through OpenVPN

I am trying to set up my home server to act as an OpenVPN gateway so I can connect to my VPN from any device without installing special software of them. My server is running Ubuntu 14.04. The host ...
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45 views

No “rwnd” option to “ip route” for managing the receive window?

Context: I'm doing some self-guided studying on TCP Window shaping. The scenario I'm trying to control for are clients which will be pulling down large amounts of data in addition to their normal ...
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44 views

Outgoing masquerade address changes after adding a second interface to the bridge

In fact I have the following configuration: extrouter(192.168.1.1) <- wifi -> [eth2 (192.168.1.11) Centos 6/6 based host br0 (172.22.5.254)] br0 contains two tap interfaces (tap0/172.22.5.1 ...
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210 views

Miniupnp thinks my router doesn't support UPnP

I have a IP camera on my network that is truly plug n play. As soon as I plugged the Ethernet cable in, it was accessible from 'the outside', without me having to touch my router's configuration. So I ...
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44 views

Routing problem through 2 hop in the LAN

This is the scenario I'm facing with: firewall (Zyxel Zywall USG210) configured as default gateway, with LAN IP 172.29.0.1 /16 2nd firewall, directly connected with the 1st, with LAN IP 172.29.0.250 ...
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routing through a GVPE network

The following is a GVPE network (VPN) setup on Debian Linux systems. It is how I interpreted the two paragraphs starting at line 174 in the GVPE README. Sadly, there is not much detail and my ...
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78 views

How to create a wireless-to-ethernet router?

I have a Debian machine, which I want to turn into a router. It will connect via wireless to a access-point, where it will get an IP. To its ethernet port, other machines will be connected. It will ...
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134 views

Internet sharing disappears when either eth0 or wlan0 gets disconnected

I just got a RasPi B+ and I'm looking to replace the Windows PC that's doing the routing job. What I'm trying to do with the Pi is making it share the connection (wlan0) with another wifi router (via ...
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128 views

route gateway proxy traffic through different interface with identical upstream gateways

My question is similar to the below with a small caveat not answered by any of these threads: Output traffic on different interfaces based on destination port ...
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99 views

Using a VPN client as a VPN gateway

I would like host 1 to use host 2 as a gateway to the remote host 3. I have scoured the web looking for a solution, but it doesn't seem to work for me. VPN client software is ike (shrewSoft VPN) is ...
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Is legacy checkpoint endpoint blocking puppy 528 wireless Internet connection and how can I remove it?

Background: Whilst booting with an old flash drive (SafeXs by block master) plugged in to my laptop (DELL latitude 6430u) I came up against a blue login screen . At full encryption point ... ...
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how to binding each each interface to a seperate VPN config

What I am trying to do is route all traffic that comes on a given interface to a specific, per interface, VPN connection where all outbound traffic is actually leaving on WAN0. I frankly don't have a ...
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77 views

Egress packets do not use non-default routing table

I made a custom routing table named test: # ip route show table test default via 10.10.10.126 dev eth0 # As seen above, it contains only a single route. As a next step, I made a rule where traffic ...
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322 views

Setting up a 802.11s mesh network for mobile devices to communicate with a wired server

I'm in the process of developing an android app that maintains a device's connectivity to a linux-based WiFi mesh network, and periodically sends status information (GPS, battery life, etc.) to a ...
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99 views

What is the point of the second route lookup after OUTPUT?

According to the packet path diagram, and its description: Table 6-2. Source local host (our own machine) [...] Routing decision, since the previous mangle and nat changes may have ...
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78 views

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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32 views

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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262 views

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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826 views

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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246 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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563 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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54 views

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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685 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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107 views

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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946 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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191 views

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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384 views

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 ...