the process by which data packets on communication networks are forwarded into the direction of their ultimate destination by routers.

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5answers
336 views

Dividing web traffic between servers

My website is growing too large for the one webserver that powers it to handle the traffic. Anticipating this, the code is perfectly capable of running in parallel, sharing a database, but I've never ...
2
votes
2answers
393 views

Linux: Three default gateways?

My server has three default gateways, how can that be? Shouldn't there be one default gw? I have three NICs, each attached to a separate subnet: server1:~# route Kernel IP routing table Destination ...
2
votes
4answers
944 views

Determine switches between devices on LAN

I'm on a network where most devices are DHCP. If I have a few switches between device A and a DHCP server, how can I find out what they are? traceroute just gives me 1 hop, regardless of the number ...
2
votes
3answers
108 views

Can I balance load between 4 ADSL links

I recently began to work in this organization, we have 4 ADSL separated links, so the people connect to the nearest WiFi, resulting in usage inequality. I was about to change the links to a fiber ...
2
votes
2answers
765 views

How do I determine which traffic is routed through the VPN from the client side?

If I have a Cisco VPN client on my computer and I want to see if https or http traffic is routed through the VPN or not, how should I do this? Can viewing the routing table tell me this information? ...
2
votes
2answers
183 views

Default route not on LAN

I have a network that in principle looks like this: H1---\ /----Inet1 H2---->---GW1---< H3---/ \----GW2-----Inet2 H1 and H2 = Hosts that need access to internet with GW1 ...
2
votes
2answers
7k views

Routing decision when there are two default gateways on windows

My windows machine has two network cards, both have default gateways. How does windows determine which gateway should it access when sending a packet to a remote endpoint? More precisely, here's my ...
2
votes
2answers
265 views

How should dual failover routers be switched on the WAN side?

This might be a highly daft question so apologies in advance... I have the following set up: 100 Mbit on 1Gbit carrier Fibre line into comms room, Fibre <-> EDD (ethernet demarcation device) EDD ...
2
votes
2answers
245 views

What routing protocol to use with MPLS?

My MPLS provider is giving us a choice to use static routes or BGP for our new MPLS setup. What are advantages/disadvantages of the 2 choices? What is more commonly used?
2
votes
3answers
1k views

How can I reroute a sub-domain to localhost + port number?

I have several web applications running on my developer machine. They mimic our production web applications which are hosted on sub-domain. For example, consider: api.myserver.com - is mimicked by ...
2
votes
2answers
251 views

HTTP Hostname to IP Address Routing

I currently have the following network setup: Router/Firewall > IIS Web Server When a HTTP request comes through, IIS will look at the host header and decided which website to return. My problem ...
2
votes
4answers
830 views

Linux router and firewall with IP accounting

I'm working on a project to replace my organisation's aging Slackware gateway/router/firewall machine, which will have several hundred users behind it. Previously we used rc.firewall but we are now ...
2
votes
3answers
178 views

Routing domain on lan

I have LAN setup with public server on it. The server is accessible via domain example.com. If I access example.com from within lan, it goes over my ISP. I wish it went just over my local network. ...
2
votes
5answers
2k views

Link aggregation with DSL and Ethernet, and different ISP's?

We're a webdev company that has outgrown its ADSL bandwidth. It's currently 4/1 Mbit/s and due to distance we can't simply get faster DSL, whether ADSL or SDSL. Stacking multiple DSL connections is ...
2
votes
3answers
239 views

Strange requests coming from Korean Site

Lately I've been finding a lot of strange requests like this coming to my rails app: Processing ApplicationController#index (for 189.30.242.61 at 2009-12-14 07:38:24) [GET] Parameters: ...
2
votes
2answers
116 views

Can a Windows DHCP server serve a scope that it is not a part of?

The situation I have a windows SBS 2008 box running as DC/DNS/DHCP/Exchange/File Server to a network on 192.168.1.0/24. Suffice it to say that the IP of the SBS box is immutable. At some point in the ...
2
votes
2answers
862 views

Can't ping multihoned Linux machine on non-default interface

I have a multihoned Ubuntu server with a set of interfaces that includes: eth2: 10.10.0.131/24 eth3: 10.20.0.2/24 The default interface is eth2, with a gateway of 10.10.0.1. Here's what the routing ...
2
votes
1answer
2k views

forcing network traffic to route via a specific, non-default interface

I've got a bunch of Linux servers with multiple(3) NICs and associated network interfaces. I'm tripping over a bizarre routing problem, where traffic that should use the default route is not, and ...
2
votes
2answers
220 views

Linux internet gateway able to route to address with no route set up

Synopsis I can ping and see the http config page on my cable modem at its fixed address of 192.168.100.1 from computers on the local network behind my Linux internet gateway. That gateway is the ...
2
votes
2answers
89 views

A tricky converged VoIP design

A client (roughly 30 people) wants to replace their existing analog phone system with VoIP. However: they have dual Ethernet drops to some desks, but not all their (recently purchased) router does ...
2
votes
3answers
500 views

Ping only works after about 30 seconds

Today I am working on this issue and I would love your ideas. There is a network with something like this LAN 1 -- WAN CHANNEL--- LAN 2 The LAN 1 have two segments. When I make a ping from LAN 1 ...
2
votes
2answers
1k views

Ubuntu Ignoring packets from network A on eth0 when eth4 configured on network A

I have an Ubuntu 12.04 (final beta, up-to-date) server with two configured network interfaces: root@mac:/home/sysadm# ifconfig eth0 Link encap:Ethernet HWaddr 00:1e:4f:28:fd:7b inet ...
2
votes
2answers
264 views

Networking several devices with the same IP

I have a bunch of embedded devices that I need to flash with a custom OS. On each device, the boot-loader (U-Boot) has a fixed IP of 192.168.100.2 and on boot it looks for a TFTP server at ...
2
votes
1answer
13k views

Two network interfaces and two IP addresses on the same subnet in Linux

I recently ran into a situation where I needed two IP addresses on the same subnet assigned to one Linux host so that we could run two SSL/TLS sites. My first approach was to use IP aliasing, e.g. ...
2
votes
2answers
4k views

Routing between subnets with one router?

I have a Draytek Vigor 2820 which is connected to three gigabit Netgear Layer 2 switches. Currently the network is fairly simple, 192.168.1.0/24. One the network I have 7 servers, around 50 ...
2
votes
1answer
6k views

Linux: routing traffic between two networks with iptables

Ok, so this is a strange network setup, but I`m trying to get the internets from one network to another. headless server ((((( wireless router (other network)-----internet | | router ...
2
votes
2answers
653 views

Public IP behind NAT firewall

I have a Linux NAT Firewall serving a virtual machine infrastructure. Right now all the VMs use NAT, but I'd like to have some of them to use a public IP that is not NATed. I have a range of IPs: ...
2
votes
4answers
462 views

Networks, subnets, routing and NAT

What I'm going to ask may be trivial but I really need to understand cause my teacher is confusing me! That's the problem. I got 2 private networks The first is a class C network and the address is ...
2
votes
2answers
1k views

How do I delete a route from Linux routing table

This turns out to be harder than I thought. The routes I want to delete are the "!" rejected routes, but I can't seem to formulate the right "route del" command to pull it off. Here is the routing ...
2
votes
2answers
205 views

Route over the public interface or the VPN?

I have a site-to-site VPN between two offices. Office A hosts a web service that Office B wants to access. The web service is accesible from the public internet (http://www.example.com) and on the ...
2
votes
3answers
3k views

Routing application traffic through specific interface

First question here, so please go easy: I have a debian linux 5.0 server with two public interfaces. I would like to route outbound traffic from one instance of an application via one interface and ...
2
votes
1answer
1k views

How to properly interpet the results of tracert, in particular the second to last hop before a timeout

I am troubleshooting a wireless internet connection that is continuously dropping. The isp says the radio signal is good so it must by my cisco asa 5505. I don't believe them... For discussion ...
2
votes
1answer
206 views

OpenVPN not redirecting all traffic through VPN

I have just finished setting up my VPN, and google shows my IP to be that of my VPN, so this works fine. However, when I log in through SSH to the VPN server, it shows my last login to be that of my ...
2
votes
1answer
193 views

Company VPN on same subnet as home network

My company has a PPTP VPN (I know it's not very secure) on a 192.168.1.0 /24 subnet. For people connecting from their home networks, file sharing doesn't work if their subnet is 192.168.1.0 /24. Some ...
2
votes
1answer
315 views

I need to change the external IP address based on source IP address

I'm running an iptables firewall with 5 aliased ip addresses (actual ip 10.64.18.1). This machine is also my gateway out for all internal machines (192.168.18.*). My problem is, when 192.168.18.65 ...
2
votes
1answer
239 views

Amazon AWS: SSL in our testing environment

My company has a running business web service on AWS which uses a wildcard SSL certificate (works for *.example.com). Multiple partners have subdomains and need SSL (https://partner1.example.com, ...
2
votes
3answers
853 views

Static-to-OSPF Route Redistribution

Is it possible to use redistribution of static-to-ospf in order to create an external OSPF route other than the type E2? Does this process only create a type 5 LSA and can any other LSA types be ...
2
votes
1answer
162 views

Can fragments of a packet be refragmented again?

In IPv4, fragmentation is done by routers on way to the destination if DF(do not fragment) flag is not set in the IP packet. Once a packet is fragmented, its fragments may take different paths (due ...
2
votes
2answers
368 views

IPv6 Addresses causing Exchange Relay whitelists to fail

Several of our new Exchange servers are failing to relay messages because it is communicating over IPv6 and not matching any receive connector I previously set up. I'm not sure how we are using IP6 ...
2
votes
1answer
122 views

Two different networks with two different nameservers

On (Arch) Linux, I configured a VPN, which I do not want to use for all the traffic, but for the software that binds to the associated tun/tap interface. So far, with the help of iproute2's policy ...
2
votes
2answers
4k views

Is there a way to stop relaying network traffic through VPN?

I have been experimenting with VPN lately, and I managed to get it running on W7 PC. The problem is, though, that as soon as someone connects to my PC, the internet traffic from their PC is routed ...
2
votes
1answer
167 views

Cisco Router: select outbound gateway based on the source IP

I have a network which is currently using a Microtik AH493 as the edge device. This uses IPTable for routing and packet manipulation, and we're using policy routing to select the appropriate outbound ...
2
votes
1answer
2k views

Is it possible to configure HAProxy to choose a backend server based on a request's source IP? If so, how?

The title pretty much says it all. Basically, I want to route a request to a specific backend server based on the request's source IP. i.e., HTTP Request from 192.168.100.1 -> HAProxy -> ...
2
votes
4answers
2k views

Linux Ubuntu - Two NICs separate lan

I have this /etc/network/interfaces (IPs on eth1 are fake) auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 10.0.2.15 netmask 255.255.255.0 broadcast 10.0.2.255 gateway ...
2
votes
1answer
207 views

Building a custom Router

I need to create the network below: Facts: The router is a Linux box (don't care about the flavor), it has 2 NIC's. The switch is unable to support VLAN's. The servers need a WAN-IP. NAT is not ...
2
votes
2answers
1k views

How can I prevent OpenVPN from clobbering local route?

I have a local network on 192.168.1.0 with netmask 255.255.255.0. When I connect to a VPN though OpenVPN (as a client), it pushes a route for 192.168.1.0 that clobbers the existing one, making my ...
2
votes
5answers
2k views

How can I access an internal server using a dns path?

Our build server is hosted in our office, but is accessible from the outside via build.mydomain.com. I have a dns entry on rackspace that points to the office firewall which in turn forwards :80 ...
2
votes
2answers
2k views

Using Ubuntu 10.04 as access point

Is there an easy way to configure Ubuntu laptop as access point? Sometimes when I only have cable connection to the internet I would like to give my gadgets access to the internet using WiFi. Is it ...
2
votes
1answer
836 views

Routing requests from external hostnames to internal IP addresses in Ubuntu

I want to host several websites using the same IP address. My ISP gives me one static IP address, however I have three different webservers (all running different sites) hooked up behind a cheap ...
2
votes
2answers
3k views

Why can't my local network access the internet site hosted by a server on that network?

A server on my local network is running Apache2 that hosts a site accessible from the Internet. I can access that site from outside the network just fine, but not from inside it. That is, I can't ...