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

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How should a two nic gateway be routed (FreeBSD 10.2)?

I am trying to set up a freebsd router that sits between the cable/dsl modem and my lan machines. Here is the logical setup: Cable/DSL modem connected to internet: gateway 192.168.0.1 FreeBSD ...
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Debian : 2 Nic 2 different networks switches - kernel sees a bad network

Hello Here is the situation : - VMplayer with 2 physical NICs (network interface cards) on the Windows host - VM Debian 64bits - On VM settings: both NICs are configured to replicate on the physical ...
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Configure Linux PC as router

Consider the below network configuration. wan ----[WAN router] <----> [eth1 (PC2) eth0]<---->[eth0 (PC1)] wan ----[WAN router 192.168.169.1] <--> [192.168.169.5 (PC2) 10.1.2.3] <-...
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Direct connection w/ ethernet cable

This is for "research" not pragmatic purposes -- I want to know how this is supposed to work, since my guess below does not. In other words, I do not want an answer that involves /etc/network/...
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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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How to delete gateway from default routing table use systemd

There are two physical interfaces on my machine, both with DHCP, so my default routing table looks like this: Destination Gateway Genmask Flags Metric Ref Use Iface default ...
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1answer
395 views

how to configure multiple interfaces with systemd-networkd

I have three physical network interfaces one my machine, they are all connected to different subnets, the first interface is eno1 with IP 10.10.24.157/24, the second one is eno2 with IP 10.10.25.160/...
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23 views

DNS lookup with different Port

I have 2 interface. interface_1 ip address 10.192.0.1 --- interface_2 ip address 192.168.10.2 gw 192.168.10.1 --- default gateway. Not I want to pass my url lookup (keeping 4.2.2.2) with ...
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69 views

how to add default drop route in custom routing table?

Am trying to learn using policy based routing which is based on fwmark as below. Need to forward traffic by using default entry in table1, if table1 doesnt have a default entry, then that particular ...
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22 views

Conditional routing according to protocol HTTP/S

There is a wifi corporate network which is reasonably fast but does not allow ssh connections. I want to be able to web browse using both that network and a ssh tunneled mobile USB tethering in my ...
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1answer
110 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 ...
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1answer
296 views

Can't delete default route on linux

I have two default routes and I want to delete one of them, but can't. I get no error message and the route is still there. Am I doing it wrong? Is NetworkManager screwing with me? [11:09:52]user@...
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2answers
275 views

Can't access my device via SSH over internet

I'm running sshdroid server on my android device at port 22 and I get this while I use my pc to connect to it via ssh (LAN) root@kali:~# ssh -l root 100.107.219.116 The authenticity of host '100.107....
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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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1answer
42 views

How do I configure my server to stay hidden unless it receives correct password?

The server is supposed to silently ignore any requests (including ping) unless it receives correct credentials with initial request. Nobody else can tell that the host even exists. I am talking about ...
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127 views

Sniff on SWITCH(lan) traffic openWRT

Is it possible to sniff (with tcpdump) or mirror LAN traffic that doesn't get routed to WAN using openWRT? Say I have two PCs connected to LAN ports and I want to sniff on traffic one PC is sending ...
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1answer
273 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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88 views

Access my web server publicly

On my Debian server I have a eth0 interface (192.168.10.x) and I just added eth1 (176.31.36.x). I would like to set up a public access for ssh, web, ..etc. allow-hotplug eth1 iface eth1 inet static ...
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Incoming internet SSH traffic to eth0 and outgoing internet traffic to wlan0

I have this setup: kali linux on raspberry PI connected to eth0 and wlan0. eth0 has internet access and public ip with port 22 open. wlan0 has internet access. I want to be able to connect to my ...
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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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144 views

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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1answer
287 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
312 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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53 views

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 192.168.x....
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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 (a ...
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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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1answer
1k 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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185 views

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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89 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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44 views

AODV Routing protocol on Raspberry Pi model B?

is it possible to run the AODV routing protocol on rpi ?
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1answer
380 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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180 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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43 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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399 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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289 views

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 DHCP-...
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1answer
281 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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4k 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
96 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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4k 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 ...
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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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1answer
695 views

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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209 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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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: 192....
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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 ...