Command line tool for manipulating and listing the routing table.

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5
votes
2answers
4k views

Routing selection: specificity vs metric

I understand that Linux chooses the most specific route to the destination when it does routing selection. But what about a route's metric? Does it have a higher priority than route's specificity? A ...
2
votes
2answers
115 views

linux caches route with IPs of machine it has no access to

I have a VPN with a gateway, and an application server. The app server only knows about the gateway of the VPN. The gateway of the VPN knows about the gateway of the physical network the vms are ...
0
votes
2answers
7k views

How to route UDP traffic from one public IP (linux) to another public IP(Windows)

I want to prevent direct access of my Windows Machine and want to expose some programs running on it via my Linux Machine (which again is accessible by a Public IP). Is there a way where-in I can ...
2
votes
1answer
3k views

load balancing multiple gateway using route and iptables

under linux, how do I load balancing multiple gateway by using route, note that I have one input interface lets say eth0, and one output interface lets say eth1. eth1 can connect to multiple IP ...
2
votes
1answer
2k views

Under what circumstances will Linux ignore the route table when choosing the MAC address for an outbound frame?

While debugging a problem with the networking configuration for a set of virtual machines running under KVM, I discovered a circumstance where the kernel in the guest VM has decided to stamp the ...
0
votes
1answer
2k views

Why is a ping response being sent to the wrong gateway?

In a previous question, I was trying to determine why my OpenVPN clients could not ping the server LAN, even though the server LAN could ping the clients. Having investigated this further, I ...
6
votes
3answers
38k views

howto only tunnel specific hosts route through openvpn client on tomato [closed]

I am relatively newbie in networking world although I did coding and know some sysadmin background for a long time. and here I'm only one step from my destination. The whole picture is : at home I ...
19
votes
6answers
8k views

Use IPtables or null route for blacklisting about 1 million IP addresses?

I've come across a situation where a client needs to blacklist a set of just under 1 million individual IP addresses (no subnets), and network performance is a concern. While I would conjecture that ...
14
votes
2answers
27k views

Where route to 169.254.0.0 comes from?

Running CentOS 5.4 Why do I have route to 169.254.0.0 although it does not appear in Network > Ethernet Device > Route configuration dialog? Destination Gateway Genmask Flags ...
14
votes
6answers
13k views

How to duplicate TCP traffic to one or multiple remote servers for benchmarking purposes?

Infrastructure: Servers in Datacenter, OS - Debian Squeeze, Webserver - Apache 2.2.16 Situation: The live server is in use by our cusotmers every day, which makes it impossible to test ...
2
votes
3answers
34k views

OpenVPN client on Windows 7 - cannot add route from config script

Hi I am connecting from my Windows 7 laptop to an openvpn server and I am unable to automatically add a route. In my script I have the line: route-up "route add 192.168.33.0 mask 255.255.255.0 10.0....
1
vote
4answers
747 views

Why am I getting different results from two servers that located in the same destination network?

There's two servers with the same network IP, and the only difference between them is the last two numbers like: 37.211.15.247 and 37.211.166.178. The Hosting Provider claims that the subnet mask for ...
6
votes
1answer
6k views

Why Openvpn use network 0.0.0.0 netmask 128.0.0.0 as default route?

If you use "redirect-gateway def1" option in openvpn config file,the server will add a default gateway on your route table, what i want to konw is Why openvpn did not use network 0.0.0.0 netmask 0.0....
1
vote
1answer
106 views

Routing based on the source ip

I'm trying to configure a host in a way that the traffic is routed either via eth0 or vlan123@eth0, depending on the source address used. Both interfaces have access to the whole network and both have ...
0
votes
2answers
4k views

.bat file to automatically connect to VPN and add a route in Windows 7

I can establish VPN connection using RASDIAL command. But how do I add a route to 192.168.254.0/24 automatically after VPN is connected? Each time after VPN connection is established, Windows could ...
6
votes
2answers
899 views

AWS VPC internet gateway and AWS services

Am I doing something wrong or is the AWS VPC ec2 instances not able to reach any of the AWS managed services (s3/sns/sqs) without a public route to the Internet Gateway in the routetable? I was told ...
2
votes
2answers
410 views

How does Linux pick which network interface to use?

Let's say I have a machine with two network adapters on different subnets, eth0 (10.0.100.5) and eth1 (10.0.200.5). Assuming both subnets have routes to the internet (though their own NATs) and to the ...
2
votes
1answer
459 views

Windows 7 routing traffic through the gateway for local addresses

Windows is adding a route for a local address (10.0.0.90 - my fileserver) with a gateway of (10.0.0.138 - this is my gateway), the gateway only has a 100Mbs link so all of my fileserver bound traffic ...
1
vote
4answers
15k views

Static route toward a DNS Address, it is possible?

I need to add a static route on a windows server toward a web server with a service; I need to add a static route with this command on a Windows command prompt: ROUTE ADD -p IPADREESS GATEWAYIP Is ...
1
vote
1answer
1k views

How can I configure my DHCP server to distribute IP routes?

I have a DHCP server (Linux, IPCop, dnsmasq) running on my default gateway server 192.168.0.1. I have a VPN endpoint on another server in the network (192.168.0.4). Is it possible to configure the ...
1
vote
2answers
4k views

How to remove route with IP?

Used to ban some flood-bots with route add -host $ip reject But couple of 'good' IPs were banned as well. My question is stupid (but I've searched and found no good solution (all were large and/or ...
1
vote
2answers
3k views

Static route for entire octet or by host name?

I've added a few static routes, for the most part the following has worked fine: route add 123.123.123.123 mask 255.255.255.255 100.100.100.100 metric 10 -p However, one URL resolves to more that ...
1
vote
3answers
10k views

Adding static route through group policy

We are trying to add a static route across all of our end user machines, we have setup a GPO object under Computer configuration > Policies > Windows Settings > Scripts (startup/shutdown) > Startup. ...
1
vote
3answers
12k views

How to reach a device on a different subnet?

I have what may seem to be a basic question about routing, but I ask it because I am not sure where to start. I have a simple network setup: Client1, Win7, 192.168.0.50, default gateway is set as ...
1
vote
5answers
560 views

Different Routes For The Same DNS

I don't know the right term for this concept. But basically, I just want to reroute internal traffic to go directly to a server within the network instead of going around the internet. The domain have ...
0
votes
2answers
2k views

Linux as a gateway (no NAT)

I'm trying to configure a linux server as a gateway/router, but I can't get it to work, and all information I've managed to find is NAT-related. I have a public IP block for the gateway and devices ...
0
votes
0answers
301 views

How to redirect VPN traffic on OS X

I have following problem: I need to connect to VPN and access specific resources (ip addresses). When I connect to VPN all network traffic goes through VPN but in fact I need only specific ...
0
votes
3answers
3k views

OpenVPN - Client traffic is not entirely routed through VPN

I installed OpenVPN on my dedicated server. Using Viscosity or Tunnelblick on the client, I successfully connected to this server. However, after some tests, I realized that not all the traffic ...
0
votes
1answer
48 views

Bizzare routing: EITHER accepts emails OR sends depending if NetworkManager is running

Due to an otherwise unrelated hardware failure (long story) I've been forced to return an older Fedora Core system into service as a mail server. It's primary service is as a file server and Samba ...
0
votes
1answer
3k views

openvpn: after changing to server mode, client does not create TUN device

I had a previously working configuration with the config files used in a previous question However, I've changed this now to the following configuration using server mode, everything on the logs seem ...
0
votes
1answer
4k views

Static route issue on Windows Server 2008 R2

There's a virtual machine with Windows Server 2008 R2 installed. There are two NICs connected to it: PROD & BUP. The BUP interface is configured without default gateway. After adding static route ...
0
votes
1answer
2k views

using a gre tunnel as default route

I have two private networks (A, B) that connects via another company's private network (C). Network A has internet access. I want to make a tunnel between B and A that goes through C. Then network B ...