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

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Allow IP packet forwarding from LAN to modem via router

In short: I'd like to be able to telnet to my modem from my PC via my router. There is a simple home router on 192.168.33.1. It is running OpenWrt. It has the following interfaces defined: br-lan ...
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1answer
358 views

Firewall/routing rule in Centos for this setup

I have two ethernet interfaces, namely eth0 and eth1. I want to implement an advanced routing rule but I am totally new to firewall/routing rules in CentOS. Here is what I am trying to do: Both my ...
5
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1answer
393 views

Using source routing (LSRR) - any ideas?

What I want to do is conceptually very simple, but I can't find any information or help about how to go about doing this. Basically, I want to configure my networking to use source routing (LSRR). ...
3
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2answers
593 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 ...
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0answers
134 views

Unable to access internet if wireless enabled

The following is my route output. eth0 is my wired network and eth1 is my wireless network. Only wired one has access to internet. If I enable wireless, I am not able to access internet, it tries to ...
3
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2answers
1k views

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 ...
3
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2answers
475 views

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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1answer
2k views

iptables forwarding and routing

In fact, this question is about openwrt and CoovaAP, but I guess it's the same in other linux distributions. I've two interfaces, a "wan" and a "wlan" interface. Is there by default any filter, ...
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2answers
3k views

How is the loopback network interface implemented?

The loopback network interface "is a virtual network device implemented entirely in software," according to another question on Unix.SE. But how is this implementation actually accomplished, and how ...
2
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2answers
421 views

How do I route a spare network interface through an SSH tunnel?

I just bought a Raspberry Pi and I am wanting to route an ad hoc wireless network interface fully through an SSH tunnel that was created using another wireless interface. I want to do this so that I ...
1
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1answer
594 views

How to provide a “guest LAN” on one ethernet device

I have an always-on machine running Debian/Squeeze with a couple of ethernet ports (it's doing various serverish jobs, including DHCP) and a LAN on each. eth0 is on 192.168.7.* and has access to the ...
3
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1answer
438 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 + ...
3
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0answers
173 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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1answer
2k views

Redirect http using iptables for an ip range

I have a range of ip addresses (10.13.13.10-19) that I want to redirect all outgoing http traffic to an internal webserver. So if someone in that range tried to access any site, the html from my ...
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2answers
11k views

Linux Networking routing to virtual ip addresses from a different subnet

New to linux networking, had a question about routing to virtual ip addresses from a different subnet. I have three servers (they can all ping each other): A 10.10.51.182 (connected to router ...
4
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1answer
5k views

Using the Wifi of a notebook via ethernet for another PC

I want to connect a PC to the internet via my notebook, which is connected to a WLAN. The setup should look like the following scheme: PC (eth0) -> Notebook (eth0) -> Notebook(wlan0) -> ...
3
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1answer
667 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
1k views

Different domains for multiple VM's on host with one WAN IP

I've got only one WAN IP address bound to KVM host system and multiple VM's with internal IP's, say, 10.0.0.1/28. On the other hand I have multiple domain names bound to host system WAN IP. The ...
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2answers
750 views

Route and “e” flag

k# route -6 Destination Next Hop Flag Met Ref Use If ::/0 fe80::8001 UGDAe 1024 0 0 eth0 [...] What does flag "e" mean?
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2answers
604 views

Having trouble with packets not making it into Fedora 16 Apache [closed]

Background: I haven't done anything with iptables in a few years... I have Fedora 16 running in a VM on VMWare, with my firewall (TomatoUSB) port forwarding to the VM. VM is at 192.168.1.155. I know ...
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2answers
2k views

linux multiple internet connections load balancing with fail handling

I have two ISP connections and need automatic load balancing between them. I also need to handle failed connections (not use one that does not work). First link is a PPTP connection (ppp0), second is ...
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2answers
2k views

Bringing up an interface does not add default gateway to the routing table in Ubuntu

I have this in my interfaces file: auto eth1 iface eth1 inet static address 20.135.251.218 netmask 255.255.255.252 up route add default gw 20.135.251.217 dev eth1 metric 1 ...
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2answers
2k 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 ...
3
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1answer
37k views

Adding two default gateways in Debian interfaces file

This is my interfaces file: auto eth0 iface eth0 inet static address 192.168.1.10 netmask 255.255.255.0 gateway 192.168.1.1 auto eth1 iface eth1 inet static address 192.168.2.10 ...
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2answers
635 views

Adding an ip to a routing table

Is there any way I can add an ip to an interface , but interface route gets created on a routing table other than 'main' routing table in linux? For ex: If I add an IP 10.11.20.10/24 to eth0, it ...
2
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1answer
896 views

Routing private network to internet via 2 gateways

I have the current set up for an embedded environment: Embedded Target (192.168.0.200) -----> Virtual Machine (VMWare) (2 NIC's - 192.168.0.2 (Target Port) and 192.168.49.69 (NAT Port to host)) ...
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1answer
582 views

routing between two private networks (NICs)

I have two private networks say: 10.0.1.0/8 and 192.168.0.0/24 I have two machines with two NICs per each machine. machine1 NIC1: 192.168.0.10 machine1 NIC2: 10.0.1.10 machine2 NIC1: 192.168.0.11 ...
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2answers
511 views

SSH connection does not work while browsers do

I have the following network layout: Internet comes true fiber optics to modem. From modem LAN cable goes to router. Since that router wifi signal is weak, a LAN cable goes to another router from ...
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2answers
207 views

How can I use the same IP from the Internet and intranet?

I have an Ubuntu firewall box (Alma), at the office, with a web server on it. It looks like this: [Internet] <-> [DSL Router] <-> [Alma] | ...
3
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2answers
718 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 ...
2
votes
1answer
644 views

Multiple VPN connetions, routing based on country

I want to set up a couple of VPN connections to two different countries, A and B, on my Ubuntu Server. Then I would like to set up rules based on GeoIP to determine which VPN connection should be used ...
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2answers
4k views

How to build a gateway from my Linux OS

I want to configure my Linux so that it will be used as a network router (gateway). Can anybody give me some hints on this? (links are welcome!)
2
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1answer
6k views

Static route in Centos 6

Here is my route -n output: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 ...
5
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3answers
1k views

Redirect traffic through vpn on an as needed basis

My problem is really simple yet it sounds complex, but I have zero to none experience with this. I have set up a box using gentoo which has its own semi-static WAN-IP and acts as router for my LAN. I ...
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1answer
510 views

Routing tables and default routes

I have two rules in my routing tables. The default route, which is to the gateway, and a second route which forwards everything in the network segment to * or to no gateway. Is this second rule ...
2
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1answer
876 views

How to setup DHCPD on two interfaces (Angstrom)

I have an embedded system running Angstrom just fine. This platform has multiple uses, one of which is to act as a home router, so it has wireless and wired network interfaces, which work correctly. ...
5
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1answer
837 views

What is the routing behaviour when two or more default routes?

I have two ISP at the time, connected to the same machine. I added both of them in the routing table as default. However, only one connection is used. $ route Kernel IP routing table Destination ...
4
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1answer
409 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
274 views

route traffic to github through specific network interface [closed]

okey, I'm a complete NAP, so take it easy on me :) My Situation; My computer is in this stupid cooperate network of the company i work for. They have alot of policies and stuff, so its not possible ...
11
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3answers
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Output traffic on different interfaces based on destination port

My question is basically the same as Only allow certain outbound traffic on certain interfaces. I have two interfaces eth1 (10.0.0.2) and wlan0 (192.168.0.2). My default route is for eth1. Let's say ...
2
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1answer
402 views

Can I use 2 WANs on DD-WRT?

I bought TL-WR1043ND and flashed it with DD-WRT. Now Im wondering if it's possible to use physical WAN port and wireless client WAN for internet usage and at the same time broadcast SSID for wired and ...
2
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0answers
445 views

Why are packets not moving forward? [closed]

I have a server with forwarding turned on. I placed an iptables LOG target in the PREROUTING, INPUT, and FORWARD chains of the mangle table. I can see the LOG messages from PREROUTING, but not INPUT ...
2
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1answer
2k views

Routing in OpenVPN between a private network and a client

I'm trying to setup OpenVPN between a private network and home clients that connect to it. (The clients don't need to connect to each other). The network topology is a little interesting. There is a ...
2
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1answer
2k views

Static routes in HP-UX

I need to set static route in HP-UX. I edited /etc/rc.config.d/netconf file and added new entry for my route: ROUTE_DESTINATION[1]="10.105.2.0" ROUTE_MASK[1]="255.255.255.0" ...
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2answers
817 views

use iptables to allow incoming connections to some computer on port XYZ?

This is what I have: iptables -i em1 -A INPUT -j ACCEPT -p tcp --dport 9001 -v. If I want to accept incoming connections on port 9001 at this (127.0.0.1, or on the network 192.168.1.143) address, ...
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2answers
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How to refuse routes that are PUSHed by OpenVPN server?

When I establish an OpenVPN client connection over the Internet to our corporate OpenVPN server, it pushes several static routes. Unfortunately, these routes break some connectivity within my local ...
10
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2answers
16k views

Use ssh with a specific network interface

I'm using openconnect to connect to vpn. After entering my credentials, I get this: POST https://domain.name/... Got CONNECT response: HTTP/1.1 200 OK CSTP connected. DPD 30, Keepalive 30 Connected ...
4
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1answer
636 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 ...
2
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1answer
4k views

Find connections per ip on an OpenWRT router?

How can I list the number of connections per client on the FORWARD chain of an OpenWRT router? I know how to list the number of connections per IP address on the router: netstat -ntu | tail -n +3 | ...
2
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1answer
2k views

Limit the max connections per IP using OpenWRT?

Would the following iptables command on an OpenWRT router assure that no one client has more than 50 active connections? $ iptables -I FORWARD -m connlimit --connlimit-above 50 -j REJECT ...