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

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Port Routing/DNS for individual program

Background Flickr has closed its http api leaving an https only api. My favourite uploader (the official Flickr Uploadr version 2.5 running under wine) is no longer maintained, so this change broke ...
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2answers
563 views

Send traffic to self over physical network on Ubuntu

I have a dual port ethernet NIC and let's say I have connected both ports in a loop and assigned the following IPs to the 2 ethernet interfaces: eth2 -> 192.168.2.1 eth3 -> 192.168.3.1 I want to ...
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932 views

How to set up ssh server with VPN tunnel? (Policy routing for sshd service)

It's difficult to me to explain in words, so I made diagrams. In short, I want this to work: Basically I want to be able to connect from my laptop [A] to my desktop [B] via ssh, and run terminal ...
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2answers
288 views

Is it possible to set-up a VPN in such a way that I disconnect from the Internet if it goes down?

How can I set-up a VPN so I loose connection to the Internet if it goes down? I use Ubuntu and have used the network-dialog to use a VPN; but if the VPN goes down, it just switches to the non-VPN ...
4
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1answer
589 views

Simplest way to set up multiple subdomains to separate VMs running on single host

Problem: I´m planning to set up several virtualized centos, rhel or ubuntu guest machines on a single centos host server (most likely using KVM). Each guest VM is running an instance of a webapp + ...
4
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1answer
873 views

Routing Tables: What is the effect of the RTF_IFSCOPE flag?

(Related to this question I posted a while ago on apple.stackexchange.) What is the difference between the following two routing table entries: default E.F.G.H UGSc 0 ...
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3answers
4k views

Send duplicate packets over two Internet connections

I need to duplicate an RTP stream over two different (non-reliable) Internet connections. On the receiver side, I will probably run a custom program that will use a buffer and rebuild the stream ...
4
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1answer
578 views

Fix “Route hash chain too long” without restart

On our production server (ubuntu 12.04, 3.2.0-63 kernel) routing cache reached its capacity. Modifying rhash_entries is out of the question, since it is a kernel boot param, and we can not restart the ...
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1answer
1k views

How to open VPN connection inside other VPN connection under Linux/Ubuntu

Is it possible to have two VPN connections on top of each other under Ubuntu? Scenario: My organization is quite large and has its own large network. Each group inside the organization has its own ...
4
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1answer
127 views

putting extra hops into traceroute6 on OpenBSD

I'm running OpenBSD, or maybe FreeBSD. I don't have lots of IPv4 addresses to waste, but who doesn't have a few billion of IPv6 ones? How do I add some extra IPv6 hops to a traceroute6, around pf(4) ...
4
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1answer
444 views

Throughput test setup with two local Ethernet interfaces

I'm currently testing the routing performance of a hardware device (DUT - Device Under Test) with the following setup (all addresses start with 192.168.): eth0 (29.2) <---> eth1 (29.1) eth2 ...
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1answer
2k views

multigateway routing for specific src port

I have two gateway to access internet, somehow I want to load balancing it, so far its working, but some connection or service need persistent gateway IP to be used, so the client should never change ...
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Reassemble images forwarded though Linux router? [migrated]

In 2003-2004 I used a Linux app that reassembled images from HTTP traffic forwarded through a Linux router, displaying them live. Just a command line app that threw up an X window, showing the images ...
4
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1answer
900 views

Why is this static route not taking effect?

Original Question I am running Ubuntu and network manager. I have two different interfaces, eth0 and eth1. Network manager has (as far as I can tell) correctly added this manual route: ~$ ip route ...
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2answers
713 views

Policy routing with load balanced ppp connections

This my setup using Debian 6.0. 6. It's role is a proxy server and a load balancer using eight 3G modems. Whenever a ppp connection dials it takes over the default gateway which is ok but it also ...
3
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1answer
187 views

Local DNS Server Refuses to Ask itself for DNS

I am running Debian 7 and have set up a DHCP and DNS server. Everything is working nicely, except for the server itself not following the DNS entries in BIND. The problem is that /etc/resolv.conf is ...
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4answers
2k views

Sniffing packets through router

I would like to create a system like this. The user would connect through a wifi network which would reroute all http requests and responses through the network card on a computer thus allowing that ...
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2answers
2k views

Use eth interface to connect to a router and wlan for the internet

I am currently trying to configure a router to which I connect to (to its web interface) using an Ethernet cable through the eth0 interface. That router doesn't have access to the internet. Now, I ...
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2answers
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Xen, bridge and multiple IPs on CentOS

There's a new server that is assigned 5 IP addresses. I want to use Xen to run several VMs with various services. This is my first attempt to install Xen, I use this tutorial as a guideline. Stuck ...
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2answers
794 views

Block specific IP from accessing gateway

Suppose you are on linux internet gateway/router. What would you do to block a client with specific IP using bash script. I prefer something like ./block_client.sh 192.168.1.123 to block and ...
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2answers
64 views

Linux static routing : Ping a private network(Network Diagram Attached)

In the Network Diagram above my aim is to ping 192.168.20.20 from System A. I do not want to configure the router. For that to happen All the traffic to 192.168.20.0/24 should be first forwarded ...
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1answer
82 views

add route in Linux if sub-net, where gateway is situated, is not configured

I have a PC which has 192.168.1.1/24 configured to eth0 interface. Now if I try to add routes via 10.10.10.254, the ip utility reports that No such process: root@PC:~# ip neigh add 10.10.10.254 ...
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554 views

Use two NICs for different subnets

In my office I have use a system with two network cards. I want to use both at same time. I have four subnets in my LAN. I want to route two subnets (192.168.2.0 and 192.168.4.0) through eth0 and ...
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2answers
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Primary network interface in Linux

I have a server box with two interfaces. One of the interfaces is connected to the internal network, another - to external. I have assigned IP 192.168.1.200 to internal interface (eth0). I have some ...
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1answer
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mutliple default gateways for alias interfaces (SOLVED)

Alias interfaces defined in /etc/network/interfaces cannot have multiple default gateways. Unfortunately I would like to use the same interface to access 2 differents nets, and I need to define 2 ...
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1answer
1k views

Share Internet Connection from computer to new router

On my linux computer I have an external wlan adapter which is connected wirelessly to internet (an access point). Now I want to connect my linux computer via ethernet cable to a new ddwrt router. This ...
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3answers
404 views

What happens to local LAN traffic on linux to non-loopback addresses?

One thing I've never quite understood on Linux is what happens to local traffic that isn't directed at loopback. For example, given the following network setup: [root@pe-323-master ~]# ifconfig eth0 ...
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1answer
859 views

Routing through iptables

I have this vpn client that touches the routing table and then keeps watching it to exit if it gets touched. It is the kind of setup needed for an endpoint, such as a laptop. I want to use a small ...
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2answers
828 views

Need help with routing

I have set up a Ubuntu server, that I want to use as a router for my local office. The problem is, that I want to make 2 VPN connections, to remote branches, and then I want to route all traffic to ...
3
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1answer
111 views

How to create an internal multipath gateway

Basically trying to bend bridging and NATing to my will with quite a unique project. I've simplified what I'm doing below (VM=Kali virtual machine for testing): ZoneX's are network namespaces, ...
3
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1answer
369 views

Linux: How to auto-configure IP routing based upon ping results

I've got a linux server with two possible connections to the net: one is a slow, high-latency cellular modem (ppp0), and the other is through fast wifi->broadband (wlan0). The problem is that the ...
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1answer
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How do I route different users over different OpenVPN tunnels in Linux?

The setup: I have multiple, static-key OpenVPN client/server configurations, labeled "client1", "client2", and "client3" with server/client IPs 10.10.1.1/10.10.1.2, 10.10.2.1/10.10.2.2, and ...
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Linux: Is there a IPv6 equivalent to the IPv4 kernel option accept_local?

Since linux kernel >= 2.6.33 the kernel option "accept_local" can be modified: /proc/sys/net/ipv4/conf/${interfaceID}/ accept_local - BOOLEAN Accept packets with local source addresses. ...
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Debian 8 : where are default static routes set?

i'm facing a strange problem with my newly installed Debian 8 box : default static routes are missing the 0.0.0.0 destination route. $ sudo route -n Kernel IP routing table Destination Gateway ...
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Routing on per application basis

I'm using a proprietary VPN client on my Ubuntu Linux work station (Astrill) which support several types of VPNs. One of these VPN types is OpenVPN, which creates a virtual interface tun0 when ...
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241 views

About tun2socks (BadVPN) SOCKS proxy

I am not very experienced with socks proxy. Recently I found the tun2socks. If you open the link, in the 1st paragraph it says : It implements a TUN virtual network interface which accepts all ...
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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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346 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 ...
3
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1answer
202 views

Route VPN traffic through different proxies

I want to setup VPN server and route (based on my routing algorithm) all traffic through different proxy servers. Let's say I have one host, with many users, connected to my VPN. I want to route all ...
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134 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 ...
3
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1answer
143 views

How does Linux handle 2 identical destinations in its routing table?

I have this is my routing table (in that order): 10.3.68.0/22 via 172.16.100.9 dev vlan4 10.3.68.0/22 dev eth3 proto kernel scope link src 10.3.69.254 eth3 has ip 10.3.69.254/22. Why does ...
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4k 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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1answer
1k views

Creating a private network for internal VMs

I am trying to configure a private network for use with my Xen VMs, in addition to the public network in use by another of the VMs (VM1, which has its own public IP). So far, I have the public side ...
3
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1answer
199 views

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 ...
3
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1answer
140 views

What are the requierements to sniff UDP packets in a Wireless Ad-Hoc network?

In a wireless Ad-Hoc network, I have two computers which communicates in UDP together from 192.168.1.3 to 192.168.1.5 I have a third computer (192.168.1.6) which wants to listen to the packets which ...
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1answer
495 views

Alternative to mrouted for DVMRP on Debian Squeeze

I need to implement DVMRP protocol to route multicast over Openvpn (tun) connection for some old 3Com NBX phones. I use Debian squeeze so mrouted is not available (obsolete). What can I use ...
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185 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 ...
3
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1answer
2k views

How do I configure OpenVPN as a Gateway client for Witopia?

I have the following setup: Witopia SSL account Synology 409 NAS (with OpenVPN and Apache etc) PS3 Mac Apple AirPort router (configured for NAT) Locked IPT-box (using DHCP and NAT traversing) ...
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2answers
2k views

Use a specific interface for a specific destination subnet (source IP setting)

I am looking for some sort of routing trickery to set a specific source IP: Local machine has two IPs; Eth1: 192.168.0.1 Eth1:2 192.168.0.2 Default gateway is 192.168.0.254 via Eth1 Remote subnet ...
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3answers
3k views

CentOS: Sharing WLAN for internet access

I have installed CentOS 6.2 on HP Proliant server. I want to share my USB wireless internet (Tata photon +). I am able to start internet on my server, but when I enable my LAN, I don't have internet ...