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

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2answers
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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
5k views

multiple 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 different nets, and I need to define 2 ...
4
votes
1answer
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 ...
0
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2answers
26 views

Configuring 2 NIC with 2 gateways

Lets say my router has a LAN (192.168.0.1/24) and a DMZ (192.168.1.1/24). My computer has 2 NICs, one for LAN and one for DMZ. How can I configure my routes so that it uses both gateways instead of a ...
5
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1answer
4k views

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 ...
2
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1answer
2k views

forward packets from one interface to another interface using iptables

I have an embeded system with 2 interfaces e0 and m0, whose ips are 10.0.0.20 and 192.168.0.20, respectively. Incoming packets into e0 have an ip of 10.0.0.10 and should be forwarded to m0 interface ...
7
votes
1answer
2k views

What do I need to add a virtual IPsec adapter?

I'm trying to set up an IPsec connection manually from the console with iproute2. What I need is a virtual interface (at best, a virtual IP address could also be sufficient) that IPsec-transforms ...
0
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1answer
763 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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0answers
51 views

Centos 7 persistent static routes for any interface

I am trying to set up some static routes in a CentOS 7 box. The official RHEL says it is possible to add files in /etc/sysconfig/network-scripts/route-interface. This approach works, however I need ...
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0answers
36 views

How add configure to add default gateway from different subnet?

I am working in a host in LAN segment of 192.168.148.X with subnet mask 255.255.255.0. The LAN should be configured to use 192.168.128.1 as default gateway. What I normally do is to issue following ...
4
votes
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) ...
3
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1answer
72 views

PPTP VPN not working with Linux router

ORIGINAL: I've just switched from an old Linux install (Debian squeeze) to a new one (Linux Mint 17.3) for my router (I am using a full desktop PC with a Linux install as my router). The Linux PC ...
8
votes
7answers
115k views

How can I change the default gateway?

Currently I'm running a FreeBSD 9.1 and the default gateway is already configured in the rc.conf. rc.conf: defaultrouter = "10.0.0.1" But now I want to change the default gateway without rebooting ...
8
votes
2answers
2k views

Bind unix program to specific network interface

Question: How do I launch a program while ensuring that its 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 ...
0
votes
1answer
21 views

Show kernel routing exception entries (FIB)

Linux 3.6 removed the ipv4 routing cache (commit). Changelog says: Remove the ipv4 routing cache. Now lookups go directly into the FIB trie and use prebuilt routes cached there. According to ...
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0answers
36 views

How to route packets between private networks on linux?

Hello! I need to connect 3 networks. Here is what I did: for the "left" host ip route add default via 192.168.26.4 ip route show default via 192.168.26.4 dev enp0s3 for the "right" host ip ...
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0answers
24 views

Why does a connection from my LAN to my public IP address fails?

I have an OpenVPN server on server. It is available from Internet via a two NATs: first the ISP box relays to 192.168.0.10, then 192.168.0.10 relays to 10.10.10.254 (relays = DNAT). I can connect ...
0
votes
1answer
55 views

How to route IPv4 traffic from an interface to another

I connected my Pi to my home computer through an Ethernet link. My computer is connected to the Internet by a wireless connection. And I'd like to route all Internet traffic from my Pi by my computer. ...
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0answers
30 views

How to make load balancing work from the pfSense box itself?

pdSense is a special distro of FreeBSD for routing. It supports limited multi WAN load balancing, i.e. it is possible to configure pfSense so that each next request will connect via different WAN ...
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0answers
11 views

OpenVPN maintain connection state during tunnel reconnect

Sometimes I want to do a short maintenance like restarting a tunnel, all connection running on top such as file transfer...etc will receive connection lost signal, is it possible to maintain those ...
3
votes
1answer
79 views

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 ...
9
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1answer
3k views

Change remote host IP address without losing control (Linux)

How can I change a remote host primary IP address without getting disconnected at all (without being in a "no IP addr" state). The matter is poorly discussed on Internet (according to my research). ...
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1answer
25 views

How Would I Appropriated Add this Route?

I've got an ASUS RT-AC66u running an OpenVPN server working fine. But on my debian server I have to add a route or else I get no responses. Just curious if there is a way to add the route to the ...
3
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0answers
16 views

Routing policy is not working

I have an Access Point with OpenWrt. On other host of the same LAN there is a squid (IP Address 192.168.80.148). I'd like to route packages with destination port 80 to 192.168.80.148. So I have ...
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0answers
33 views

Browser issues with VPN

I have a VPN setup which usually works completely fine. However, when I connect to my VPN server via some wifis, Firefox and Chrome seem to run into issues and aren't able to open websites anymore. So ...
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1answer
51 views

Which components update routing table?

I am experiencing strange behavior on Arch Linux, when various virtual network interfaces lead to undesired automatic updates to the routing table. For example, when I start KVM. Before (network is ...
2
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0answers
15 views

ipv6 rule priority duplication

When I add ipv4 policy rules using ip rule add the resultant rules get added to the end of the policy table with decrementing priority from 32767 eg: # ip rule add lookup 8 # ip rule add lookup 9 ...
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0answers
25 views

Centos static route

I have a load generator running on a Centos client and I need to alter the routing table on that client to send all traffic destined to a particular server(192.168.7.215) through a WAN ...
0
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1answer
34 views

Routing traffic with multiple NICs on Ubuntu

I currently have a workstation set up with two NICs on separate networks. My current setup is this: eth0: LAN eth1: Outside internet I have a default gateway set up on eth1 to reach the outside ...
3
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0answers
87 views

iptables and ip forwarding for failover

hi i have an ethernet nic interface with 4 additional virtual interfaces (failovers) all configured with public ip4 (IP-1 to IP-5) / netmask 255.255.255.255 / broadcast addr same as ip: eth0 ...
0
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0answers
32 views

pptp: possilbe to push routes to windows client?

I use pptp (PopTop) as default from Ubuntu 15.10, I try to push some routes to windows clients. Ad I 've read, it should be possible using a dhcp server instead of the internal address configrations. ...
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6answers
6k views

Make nslookup use specific interface

On my computer I have two network cards. Both are using different Internet Providers service. Both Internet service provider have different DNS server and their IP address are known to me. I want to ...
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0answers
24 views

Setting up VPN on Linux

I have problems setting up networking on my laptop over VPN. I need to connect from my home to VPN which has the same IP address space as my home network. My network: 192.168.0.0/24 Other side of ...
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1answer
20 views

Execute command with specific routing (ip/iptables)?

I saw great solution for binding application based on some routing table alias... not sure now what it was, but for sure with ip, route or iptables tools... anybody knows the procedure? What was the ...
0
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0answers
31 views

Why is apache rendering internal ip?

I have apache running on 192.168.0.2 (localhost), and a NAS on 192.168.0.32. When I set apache to listen to port 80, attempts to connect to my external ip produce a connection refused error, while ...
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0answers
15 views

Is there a tool or a command to change the “tagtype” from VLAN tags (single and double tag) before sending the frame over a VLAN Interface?

I have to talk to a device in a VLAN network. It requires that the tagtype field of both VLAN tags are the value 9100 or it refuses to answer. Thanks
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votes
2answers
850 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 ...
0
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1answer
29 views

How to switch generic routing to source routing?

I will need to do source routing and before going into more complicated setups I want to understand how this works by switching the generic routing (the one created magically by the networking setup) ...
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0answers
72 views

Force OpenVPN to route all traffic through one IP address (2 IPs on same NIC)

I've trying to dig up a solution for this, but all I keep turning up is how to bind OpenVPN to a particular hardware interface. Not quite what I need to do here. I run a server and I have 2 IPs at my ...
8
votes
5answers
57k views

How to remove all default gateways

I'm running a custom built linux machine, so not all linux commands are available. I execute network related commands, so I need to set a default gateway right before I run my command, then remove ...
2
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0answers
41 views

Why could policy routing on iptables marks applied in FORWARD or OUTPUT chains be inconsistent?

I am routing HTTPS connections down a SSH tunnel (-w) using iptables marks and iproute2 rules, the reasons I need to do it this way are contrived, to say the least, so most alternate solutions may not ...
1
vote
1answer
118 views

OpenVPN - Understand the routing table + How to route only the traffic to a specific ip via the VPN

I'm connecting to a VPN service using OpenVPN and everything works fine. Once I connect these are the rules that automatically are set: root@linux:~# ifconfig eth0 Link encap:Ethernet HWaddr ...
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0answers
26 views

Centos 6.x multi-homed routing question

I have a conundrum and would like to hear any pointers (been working on this for 2 days now, and need to get this server in to production). My "google-foo" has not been strong with this ...
1
vote
1answer
33 views

Which network interface is used if they are both the default gateway?

In this example below on my Linux machine, I have an Ethernet and Wifi interface established. Here is the route output: Kernel IP routing table Destination Gateway Genmask Flags ...
21
votes
3answers
32k views

what is the meaning of 0.0.0.0 as a gateway?

Can anyone clarify gateway assignment for me? What is the difference between adding gateway as 0.0.0.0 and assigning a specific ip address as a gateway?
0
votes
1answer
77 views

Does “ip_forward” need to be enabled for any iptables SNAT/DNAT (postrouting/prerouting) rules?

I remember I had to enable ip_forward kernel parameter in the past in order to run SNAT/DNAT rules in iptables successfully. Today I was reading this post: ...
12
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1answer
9k views

Linux as router with multiple internet providers

Linux as router: I have 3 Internet providers, each with its own modem. Provider1, which is gateway address 192.168.1.1 Connected to linux router eth1/192.168.1.2 Provider2, gateway address ...
0
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1answer
127 views

Linux Source Routing, Strong End System Model / Strong Host Model?

Can a multihomed Linux machine implement a true Strong ES Model? Specific Use Case I have a system with five different interfaces, each connected to the same subnet, thus the same gateway to the ...
4
votes
3answers
5k 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 ...
0
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0answers
18 views

iptables: route back to source

How can I have iptables route a source back to its source on the same requested port? Example: X.X.X.X comes in on port 22; I want to route X.X.X.X back to X.X.X.X on same requested port; how do I do ...