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

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4answers
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How to make routes on a windows 7 laptop persistent?

I have a number of (windows 7) laptops that normally connect via wireless. We also have a wired network for special purposes. When one of these laptops plugs in to the wired network, at the moment, it ...
4
votes
3answers
4k views

How to configure remote access to multiple subnets behind a SonicWALL NSA 2400

I have a client that uses a SonicWALL NSA 2400 as their firewall. I need to setup a second LAN subnet for a handful of PC. Management has decided that there should be a second subnet even though ...
4
votes
1answer
12k views

Clear all and only persistent (static) routes on Windows

Is there a simple way of doing this via a shell command / batch ? A VBScript would also be ok.
4
votes
4answers
175 views

Monitor an internet link to a remote host

I have a Debian Wheezy server running Xivo (let's call it A), this server has 2 interfaces: eth0 and eth1 . There is no default gateway and only a few servers are statically reached from A. eth0 has ...
4
votes
1answer
195 views

libvirt guest cannot reach outside world

My server connects to the public internet via eth0 (50.131.xxx.xxx). The same server connects to the LAN via eth1 (192.168.138.1 on 192.168.138.0/24) On the same server, I run libvirt, which created ...
4
votes
3answers
4k views

Windows Server 2008 Ignores Persistent Route With Lower Metric

I have three Windows Web Server 2008 SP2 machines on a 10.100.20/24 subnet. I need to setup a persistent routing rule so that outgoing traffic to the same subnet goes through a hardware load balancing ...
4
votes
1answer
695 views

Quagga keeps announcing down routes

I have set up BGP on two routers using qugga. When I down the interface that holds the IP block that I am advertising zerba removes the route from its table but bgpd keeps advertising it. I can see ...
4
votes
1answer
225 views

ping request not forwarded in one direction

Edit: I solved my issue just as I was finishing this insanely long post. I had simply not enable ping reply in my windows firewall which is why I could not ping a computer on network 0 from network 1 ...
4
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1answer
1k views

Are Link-Local routes necessary (IPv4)?

I noticed in my routes output in RHEL6 (and most 2.6.x series Linux), for every interface I see the creation of the following route in my kernel routing table: 169.254.0.0 0.0.0.0 ...
4
votes
1answer
2k views

OpenVPN server cannot ping client IPs

I have flashed a router at two separate sites with DD-WRT firmware and setup OpenVPN on both. once connected the client can ping computers on the servers LAN however the server cannot ping IPs on the ...
4
votes
1answer
3k views

Single m0n0wall - Two LAN Subnets - How To Setup

I have two LAN subnets that I need to link together they are 192.168.4.0/24 and 192.168.5.0/24 There is a m0n0wall running on 192.168.4.1. It's LAN connection goes out to our network switch, and it's ...
4
votes
1answer
169 views

Calculating and billing IP multicast usage on the Internet

I've been searching for the reasons why IP multicast isn't widely supported on the Public Internet, and a commonly-cited reason is the difficulty ISPs have in tracking Multicast usage for later ...
4
votes
7answers
2k views

Dropped IP traffic with a multihomed server

(Before getting into details, I'm presenting this problem with Apache and SSH as an example, but this is not specific to TCP traffic, it is the same problem with both TCP and UDP based protocols.) I ...
4
votes
1answer
115 views

TCP works for a while, then fails, why?

This comes from an implementation of OpenStack, and we have a fix, but I don't understand why we need this fix. My machine has an ip of 192.168.20.45 My default gateway (pfsense) has an ip of ...
4
votes
1answer
172 views

Multi homed firewall with ipnat

i am trying (without success) to configure a ipnat/ipf box under FreeBSD 8.2, here is the scenario: outside inside +----+ ADSL ...
4
votes
1answer
250 views

How to prevent default route from propagating into iBGP?

I have 2 Foundry FESX448 switches which have external BGP connections. Each of them receive a default route. These 2 switches also have a BGP session configured between themselves and advertise routes ...
4
votes
2answers
487 views

Linux TC / Policy Routing tools

In addition to a really good firewall Linux has a builtin advanced routing and traffic shaping (lartc). There are many applications (firehol, firestarter, etc) to make the creation of iptables ...
3
votes
5answers
23k views

What is the difference between BGP and OSPF?

I want to setup a dynamic routing network, I want to know, What is the difference between BGP and OSPF ? Does both two need to be used together commonly ?
3
votes
10answers
5k views

Use first or last free IP for the default gateway?

Please assume a simple LAN on 192.168.100.0/24. Would you configure the default router on 192.168.100.1 or 192.168.100.254 and why? Thanks
3
votes
3answers
664 views

Is it possible to use 1 IP address to RDP into different machines?

We have 5 static public IP addresses. But we have a number of machines that we want to RDP into from home (our individual work pcs, a couple of servers, etc). Is there away to setup our router so that ...
3
votes
2answers
330 views

How any routing protocol packet reaches(flows of operations) from NIC card (physical layer) to any Routing (OSPF/RIP/BGP) daemon?

The problem is rearding the routing protocol packet flow in any linux/unix device where multiple routing protocol daemons are running. How any routing protocol packet reaches(flows of operations) ...
3
votes
3answers
1k views

What are the security risks of using pfsense in a virtualised environment?

I am thinking of using pfsense on my ubuntu server box. I'd virtualise pfsense with virtualbox, and have it route and firewall all traffic both on and destined to my server as well as the the rest of ...
3
votes
2answers
495 views

Blocking a network device from communicating with another device on the LAN

I have been working with the firewall/router distribution Pfsense for a while now and I have been trying to figure out how to "isolate" a server on my LAN from other computers on my LAN by using ...
3
votes
1answer
3k views

Multiple NICs with static IP address, default gateway problems

My server is running Ubuntu 10.04 64bit and have 2 NICs, my configuration is one interface for incoming/outgoing traffic of all the KVM guest running on this server, the other interface for different ...
3
votes
1answer
285 views

Which route when there are two physical connections?

I'm a developer, not an admin, so apologies in advance. In a small office I have two Windows Server 2008 boxes connected to a 100mbps router, which is fine for day to day running. I'm looking to ...
3
votes
3answers
6k views

How to assign multiple public IP-Adresses for 2 KVM-Guests

I am new to this whole topic and I try for days now to figure out how to assign multiple public ip-addresses to KVM-guests through a KVM host. I found tons of examples howto get such a setup with 1 ...
3
votes
4answers
943 views

What kind of router do I need? [closed]

Currently, our company network is pretty basic, consisting of two class C subnets, linked across a slow network connection via VPN. However, we are shortly moving into new premises. Our new building ...
3
votes
1answer
129 views

Reason of Dot1q Encapsulation

When creating Inter-VLAN Routing environments via Router-on-a-Stick method, why do we have to encapsulate sub-interfaces with dot1q vlan-number? What does that dot1q do and why do we have to type the ...
3
votes
3answers
2k 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 ...
3
votes
2answers
371 views

why do Vagrant docs suggest using public IP address 33.33.33.10 for local VMs?

I'm following a tutorial to set up vagrant (a tool to build and configure portable virtual machine images), and it seems that vagrant documentation suggests using IPv4 address 33.33.33.10 to configure ...
3
votes
2answers
1k views

How ISPs will assign IPs /subnets for end users in IPv6

Consider two scenarios: The end user has a simple computer, dual-stack The end user has a LAN behind a dual-stack router How will ISPs differentiate each one of these kind of users in IPv6? An ...
3
votes
5answers
2k views

How to route all traffic to one host trough one of two nic's on linux

Setup as follows: One gateway/firewall One switch Two servers behind firewall with 2 NICs each. Each NIC is connected to the switch. The servers are running Ubuntu server. One of the two NICs ...
3
votes
2answers
2k views

Two DHCP servers on the same network

We are setting up a routing link between the Windows Server 2008 networks of two different buildings in my organisation. Each network uses a different IP addressing scheme (one uses public addresses, ...
3
votes
2answers
1k 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 ...
3
votes
2answers
180 views

What happens if one BGP peer only gives me a default while the second peer gives me the full table

Summry question: If ISP A only gives a BGP Default and ISP B gives me the full table, can my router use the information it receives from ISB B to know what IP's are easier accessed through ISP A? ...
3
votes
1answer
906 views

Very slow ssh, snmp, telnet network connections but http, sftp are fast

I have a small network with about 8 linux servers, a Cisco 2600 router, and a Cisco 3500XL switch. The router and switch have been configured and working properly for years. About 6 hours ago the ...
3
votes
3answers
407 views

Problem with connecting two different networks

I have two networks: 192.168.13.0/24 (blue) and 192.168.15.0/24 (green). Computer A is connected to the 13-net, only. Computer B has two interfaces, one in each network. There is third computer that ...
3
votes
4answers
1k views

Are network and broadcast IPs supposed to respond?

I have a /24 network that is subnetted into a bunch of small chunks. I have recently gone into each router on the network (mostly Cisco) in order to document how this network had been divided. Now ...
3
votes
3answers
2k views

Recommend- XORP vs GNU Zebra vs Quagga

Any recommendations which of XORP, GNU Zebra and Quagga routing software is simple enough to hack and learn?
3
votes
3answers
1k views

Copy/Mirror traffic to WAN interfaces without “iptables tee” support

I want to copy every outgoing packet to others WAN interfaces but my iptables (v1.2.7) has not TEE target support. I wonder if there is another way (maybe using iproute2 or ebtables) to copy every ...
3
votes
2answers
363 views

Bypass openvpn for particular ip

My desktop machine runs Trisquel GNU/Linux 6.0 (which is basically a libre version of Ubuntu 12.04), and I use OpenVPN to connect to a commercial VPN provider for internet access. It currently routes ...
3
votes
2answers
1k views

custom route not working on windows

My windows laptop is directly connected to 192.168.1.0/24 (wireless lan). I access 10.21.0.0/16 though a router that is connected to both networks. The routing works fine with this configuration. I ...
3
votes
1answer
439 views

BGP path prepended route not listed anywhere

We have a simple multi-homed setup with two routers that advertise our AS to two ISP. The second ISP (ISP B) is only used for backup when ISP A goes down, so we prepended our AS 3 times on this route. ...
3
votes
1answer
159 views

Network Design and Implementation

I am currently designing the network in my office, which is relatively small now but it plans to grow very fast. The design is pretty much done, the problem is occurring during the implementation. So ...
3
votes
3answers
365 views

identify a router that cuts certain port

Is there a way to identify which particular router between me and some server blocks connections on certain port? I am in a hotel in Thailand, where they have recently changed some settings in their ...
3
votes
3answers
3k views

How to prevent asymmetric routing with multiple eBGP routers?

I have 2 routers announcing a /22 subnet to different providers (one providers connects to each of the 2 routers). I have split the /22 in two /23 to announce one /23 on each of the routers plus the ...
3
votes
1answer
412 views

Does ESXi 5 have a “routed IP” feature like Xen?

I have a dedicated server that I would like to use ESXi 5 on. I previously had Xen and it worked great. Initial network configuration was a bit confusing. The problem I have is the hosting company ...
3
votes
2answers
257 views

Multiple IPv6 routers in a local network

I'm setting up some servers that will run virtual machines using IPv6. The network topology is something like this, where the br0 interfaces are virtual: 2001:db8:fedc:aaaa::/64 ...
3
votes
4answers
2k views

Failover routing between 2 gateways

I have 2 routers in a cabinet and would like to setup fail over between the two for our servers sort of like BGP but not BGP :). I need to setup the system to realize gateway 1 is (down) or under ...
3
votes
1answer
984 views

Setting up linux routing

The system I'm trying to set up has an IP address 172.31.2.1. Its default gateway is 172.31.254.1. This works fine, and I can reach anything the gateway allows me to go to (172.31.0.0/16 + ...