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

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1answer
761 views

Can I set up two NICs bridged together and still SSH into the bridging machine?

I have a ubuntu box setup with two NICs. I can bridge them together just fine, but I haven't been able to setup a way to SSH into the box once the connections are bridged together. Here's my ...
3
votes
1answer
239 views

one way routing

I have two computers connected with VPN, and some virtual machines on each. I want everything to see each other (that is basically 4 different networked machines). What I've not managed so far is that ...
3
votes
1answer
669 views

Site to site VPN : how does the routing work?

I've established a site to site VPN with two Zyxell routers. Site A (LAN: 192.168.16.x) is the main office, and site B (LAN: 192.168.17.x) is a branch office. Both sites are able to reach each other, ...
3
votes
1answer
4k views

how to secure an vmware esxi host on a root server?

for me, a vmware machine normally has 2 lan interfaces, one connected with the lan or the management computer and the 2nd one connected with the wan interface for public access. so security is ...
3
votes
2answers
2k views

Linux IPTables Destination NAT with Asymmetrical Routing?

What is the proper way to handle DNAT when traffic leaves a different interface than it arrived on? When this happens it seems the reply doesn't have the source address replaced automatically as it ...
3
votes
3answers
2k views

udp through nat

I've two private networks (each of them behind a typical dsl router). The routers are connected to the WWW. The extern interface of each router have one dynamic IP address. I want to stream data via ...
3
votes
6answers
2k views

How to access a webserver on external network from local network?

I'm trying to make it possible to access a webserver on another network (A) from my local network (C). They have a router on our end which I cannot access directly to make any changes, If I ...
3
votes
1answer
69 views

Routing on Bonded VLANs

I've got a linux d/b server (OEL 6.4 but effectively Redhat 6 I believe) with bonded nics connecting to juniper switches. I've split the bond up into multiple vlans (bond0.11, ... bond0.18) with IP ...
3
votes
1answer
207 views

Internet access from private VPC subnet?

My brain is a little bit fried trying to figure this out but I can't seem to get private subnets to connect to the internet to grab updates for example. Basically all I want is web access for these ...
3
votes
1answer
6k views

How do I route all traffic from clients connected to the DD-WRT to its OpenVPN tunnel tun0?

I am setting a secondary (DD-WRT) router to act as a OpenVPN client so that all clients would get VPN access simply by connecting to the router. But seems clients traffic is always routed via the main ...
3
votes
2answers
654 views

How to Reverse Proxy Raw TCP Packets

I am designing a system where remote devices securely send status updates to a central logging server for aggregation. On the server I am using the Redis + Logstash + Elasticsearch solution. The data ...
3
votes
1answer
2k views

iptables: access connected openvpn client from the LAN with the VPN server

I have what is essentially a routing problem, and I'm not familiar enough with routing and iptables to effectively troubleshoot and set up my network needs. What's working I have an openVPN network ...
3
votes
3answers
3k views

Almost working: How to set up iptables and iproute2 rules on dual WAN linux server?

I have a Raspberry Pi (running Raspbian) with three network interfaces (one ethernet and two USB wifi nics). What I want to achieve is this: I have two WAN connections to the internet (DSL + Cable), ...
3
votes
2answers
6k views

How to route between 2 networks with a server with 2 network cards?

This is the first time I am faced with routing and it seems I have hit a dead end. I have the following scenario: client1: 192.168.1.10 255.255.255.0 gateway: 192.168.1.100 DNS server: ...
3
votes
1answer
190 views

Connection Drop with Load Balancing over Multiple Uplinks

I have a Server with to uplinks into the Internet. I'm doing load balancing over both uplinks with ip utility from the iproute2 package. ~ # ip route show [...] default nexthop via 217.0.117.212 ...
3
votes
1answer
650 views

selective routing through a VPN tunnel

The problem: after establishing an IPsec VPN tunnel all traffic is routed to the remote endpoint, while I only need to route the packets destined to that internal network and still be able to access ...
3
votes
1answer
1k views

No TCP connections to hosts behind VPN server (SYN, SYN-ACK, but no ACK), UDP, ICMP works

I'm probably doing something incredibly stupid, but I just can't seem to figure out what. Here's what I'm trying to accomplish: I want remote users to be able to log into our network, so I set up a ...
3
votes
2answers
821 views

Basic networking: Centos Server Router + Ubuntu Client setup.. unable to access outside world from client

I am trying to set up my Centos Server with two NICs as a router. eth0 is connected to the outside world and eth1 is connected to an Ubuntu client. Here's eth0 on the server: DEVICE=eth0 ...
3
votes
1answer
901 views

Configure server to route all traffic through OpenVPN

I have an openvpn setup that is working great. There are some 50 clients connected and everything is handy dandy. I need one of these clients to route all traffic trough the vpn. I setup a ccd for ...
3
votes
2answers
2k views

Delete specific conntrack entries?

in a multi-ISP configuration, I'm routing and NATing specific traffic, e.g. VoIP, through specific interface - to a distinct provider. When one of the interfaces (or routes) becomes unavailable, all ...
3
votes
1answer
3k views

Multiple GRE tunnels on the same host, only one routes incoming packets

I'm having a routing problem on CentOS 6.2 (kernel 2.6.32-220) Here's the setup: One host is on my local network. It's talking to two nearly identical hosts at a remote location. The two remote ...
3
votes
3answers
2k views

How do I get internal hosts to use a VPN connection set up on a FreeBSD router?

Question in short: How do I get traffic from a host on an internal network, using NAT behind a router, to use a VPN connection set up on the router? I have a FreeBSD 9 router with 4 network ...
3
votes
3answers
4k views

IP Phone over VPN - one way calls unless default route?

I have come across a strange problem with our VPN and BCM 50 (Nortel/Avaya) phone system. As you can tell by my other questions I have been doing some work on setting a VPN up from one location to ...
3
votes
3answers
364 views

ipv6 local connection

So I have an ubuntu 10.04 router that is tunneling ipv6 to hurricane electric. It has perfectly fine ipv6 connectivity. My problem is that I want to have my ubuntu 10.04 machine behind it be able to ...
3
votes
1answer
2k views

How to route all traffic over site to site VPN tunnel?

I have a site to site VPN configured between our main site (Site A) and a remote site (Site B). Site A is 10.60.0.0/16 Site B is 192.168.99.0/24 The firewall in Site B is a Juniper SSG running ...
3
votes
4answers
2k views

Dynamic subdomain routing

I asked this question over at stackoverflow, but got very few views: http://stackoverflow.com/questions/2284917/route-web-requests-to-different-servers-based-on-subdomain Perhaps it's more applicable ...
3
votes
2answers
3k views

Routing based on source address in Windows Server 2008 R2

I'm implementing a direct routing load balanced solution using Windows Server 2008 R2 as back-end server. I've configured a loopback interface with the external IP address. This works, I am receiving ...
3
votes
5answers
7k views

Is there a command in Cisco IOS to show all routes tagged with a specific tag?

In Cisco IOS, if I have a route-map entry as follows: route-map redistribute deny 10 match tag 65000 100 ! Is there a 'show' command that will give me a list of all routes that will match that ...
3
votes
2answers
72 views

Transparent proxy cache on BGP multihome

Provider A have transparent caching with squid . In the situation which a client has multihome BGP with provider A and provider B then client does not send its outgoing traffic (upload) to provider ...
3
votes
1answer
260 views

Windows server 2012 ignores static routing

BIG UPDATE: I was blind I see now that route 172.17.50.1 has netmask 255.255.255.255 and so it point to single host! But now I cannot understand how can I ping 172.17.50.10 because there is not route ...
3
votes
0answers
136 views

timing issue after route add/delete (route not used)

I have an application that is running a raw IP socket, destination of this socket is governed by routes installed via the 'ip route add' command. These routes can change during the lifetime of a ...
3
votes
1answer
229 views

Packets not entering FORWARD chain

first of all, this is not an every-day routing issue. The setup is fairly complex, so let me state it before. I got a router with, lets keep it simple, 3 interfaces. eth0, eth1, eth2. eth2 is used ...
3
votes
2answers
1k views

Routing using Linux with 2 NIC cards

Configured Clear OS to be in Gateway mode on a machine with two NIC cards. eth0:192.168.2.0/24 with ip 192.168.2.27 which is connected to a modem and thus have internet connectivity. ...
3
votes
0answers
656 views

bridged network problems running VirtualBox appliance inside VMware server

One of our hardware vendors supplied us with a virtual appliance that they said needed to run inside VirtualBox. That's non-negotiable - as it's designed to run as an appliance, they need some way of ...
3
votes
0answers
685 views

Forwarding traffic from TUN device (C++ backend) to the default gateway

The following problem is just a piece of the bigger solution I have a problem with. All other elements seem working so far, so I'll try to describe very small piece which I have problem with. I've ...
3
votes
2answers
316 views

Routing problems IPv6 client/server where server has both native and tunnelled address

I have been trying to get IPv6 working on my tap OpenVPN network. The server already has IPv6, however it only has a /64 and the biggest range available is a /116 (which breaks autoconf). I am getting ...
3
votes
2answers
287 views

Traffic not routing as expected

In the following output, why does vpn1 route/ping to 10.100.0.1 instead of to 10.100.0.112? 10.100.0.1 is network gateway with no nat. 10.100.0.112 is dual home host with nat enabled. root@vpn1:~# ...
3
votes
1answer
2k views

Windows Server 2008 R2 RAS VPN: access server on internal interface ip

short question: I'm usually a linux admin but need to setup a Win2k8 R2 server for a student project. The server is running as VM on a root server and has a public internet IP assigned. Additionally I ...
2
votes
8answers
909 views

Configure routing between same network address

I'm trying to configure routing between two networks with the same address. They are connected through a router with 2 NICs (Linux machine). Consider the figure above: How may I configure the ...
2
votes
5answers
364 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
3answers
511 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
2answers
10k 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
3answers
243 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
1k 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
223 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
4answers
7k views

Trying to understand the correct way to create a static route in CentOS, please assist

I've been trying to understand what's the correct way to add a static route on a CentOS 6.x machine. In some forums they say to create a file named route-dev_name (for example route-eth0) with the ...
2
votes
2answers
3k views

Ping one interface from the other

I have a computer (running Linux) with 2 interfaces eth0 and eth1. eth0 with address 10.0.0.100/24 eth1 with address 192.168.1.100/24 They are connected to 2 different networks (10.0.0.0/24 and ...
2
votes
2answers
326 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
300 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
2answers
352 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 ...