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

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2
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2answers
92 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 ...
0
votes
1answer
112 views

IP failover for different paths

I have a device (a single-port terminal server that I use to emulate a serial port) that is accessible via two paths: a microwave T-1 (which connects the device to the internal network at my job) and ...
3
votes
3answers
554 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 ...
1
vote
1answer
92 views

Network routing for multiples public ip?

I am using Xen Virtualization for my VM's and everything is going right with bridge mode. I can assign a public Internet ip to each VM. I want to have a VLAN for my VM's and I am thinking about ...
-1
votes
1answer
358 views

Routing RFC1918 addresses through dd-wrt via a switch

I am a bit stuck with an experiment of mine. I have a network looking somewhat like this. | Internet | | ---- |Switch| ---- | | Server w/pub IP ...
0
votes
2answers
274 views

Blocking ports on the public IP assigned to lo interface in GNU/Linux

I have setup my Ubuntu server as a router and webserver by following the answer given here. My ISP facing interface eth0 has a private 172.16.x.x/30 ip and my lo interface has a public IP as mentioned ...
2
votes
1answer
245 views

Packet flooding while configuring a Debian L2TP/IPSec client?

I'm currently at my wits end trying to configure an L2TP over IPSec VPN connection on my Debian using openswan and xl2tp box connecting to a server of unknown configuration. I've managed to ...
0
votes
2answers
1k views

Hosting websites on a public ip routed via a private subnet using one Linux machine as both router and server

I use Ubuntu server as router, NATing router and webserver. The server is connected to ISP with a public /29 subnet. Also I host some important websites on it. I asked the ISP to provide ipv6 address ...
1
vote
1answer
109 views

correct routing for multiple devices

I have Debian Lenny machine with 3 interfaces enabled (eth0-2), and I have problems as follow. eth1 is connected to a router and this router has portforwarding for port80. eth2 is connected direct ...
3
votes
1answer
969 views

Configure IPv6 routing

I've got IPv6 addresses from SIXXS. My host is connected with SIXXS network over a AICCU tunnel ("sixxs" interface). My host address is 2001:::2, the host on the end has address 2001:::1. On my host ...
0
votes
1answer
1k views

Allow access to printer between interfaces on Cisco ASA5510

I have a Cisco ASA5510 where we have to separate networks on two separate interfaces. The networks should have nothing to do with each other except that network B needs to access a printer on network ...
0
votes
1answer
597 views

Bringing an IPsec tunnel on the hardware node to the OpenVZ containers

I have a server hosting OpenVZ containers. An IPsec tunnel is configured on the hardware node (HN) and I'd like to make the remote network available in the containers (CT). How can I do this? The ...
0
votes
2answers
189 views

Iptables DNAT / only one url

I have a rule similar to this: iptables -t nat -I PREROUTING -p tcp --dport 80 -s 192.168.1.5 -j DNAT --to-destination 192.168.1.2:80 which redirects all http requests from 1.5 host to 1.2.. I want ...
-1
votes
2answers
1k views

Route forwarded traffic through eth0 but local traffic through tun0

I have a Ubuntu 12.04/Zentyal 2.3 server configured with WAN NATed on eth0, local interfaces eth1 and wlan0 bridged on br1 on which DHCP runs, and an OpenVPN connection on tun0. I only need the VPN ...
7
votes
2answers
11k views

Why do ICMP Redirect Host happen?

I'm setting up a Debian box as a router for 4 subnets. For that I have defined 4 virtual interfaces on the NIC where the LAN is connected (eth1). eth1 Link encap:Ethernet HWaddr ...
0
votes
1answer
2k views

Adding a route via a different subnet on linux

Here's my configuration : IP adress : 192.168.1.4 Netmask : 255.255.255.0 Default gw : 192.168.1.200 Routing table : Destination Gateway Genmask Flags Metric Ref ...
-2
votes
2answers
205 views

Network traffic across different (sub-)nets, how does the route get determined? [duplicate]

Possible Duplicate: How does Subnetting Work? Imagine there is a small network with 2 subnets. Both of the subnets have their own switch (means: all machines on that subnet share the same ...
4
votes
2answers
241 views

Impact of MTU on IP packet fragmentation and reassembly

Let's say computer S (sender) sends some IP packets to computer R (receiver). Between S and R, there are 6 networks, divided by 5 routers. So the IP packets leave R, go through network 1, pass router ...
2
votes
1answer
1k views

Using Juniper EX3300 as a router [duplicate]

Possible Duplicate: Using the Juniper EX3300 Switch as a router? So I have a Juniper EX3300 Switch. One of its uplink ports (ge-0/1/0) is connected to my ISP's router. ISP router's port ...
8
votes
4answers
2k views

Multi-WAN bonding across different media

I've recently been thinking again about a product that Viprinet provide, basically they've got a pair of routers, one that lives in a datacentre, Their VPN Multichannel Hub and the on-site hardware, ...
0
votes
2answers
161 views

VLAN across a router to give wireless access to remote sites?

I've been looking online for this answer, but getting conflicting information. I was under the impression that you couldn't use a VLAN across a router, but maybe it's possible (according to some ...
10
votes
1answer
382 views

Network Restructure Method for Double-NAT network

Due to a series of poor network design decisions (mostly) made many years ago in order to save a few bucks here and there, I have a network that is decidedly sub-optimally architected. I'm looking for ...
1
vote
1answer
265 views

Routing between two OpenVPN tunnels fails

We have three sites A, B an C. There is an OpenVPN link from A to B and from A to C. A is the client for both. Bnet Cnet | | B C \ / \ / V A | Anet Anet can communicate with ...
1
vote
2answers
303 views

IPv6 connections routed to IPv4 device

I have an IBM 9406-250 with V5R1 and IPv4 only connectivity, and want it to be reachable over IPv6. I cannnot install an IPv6 stack on it, but I want it to be accessible by IPv6 so I can drop the ...
1
vote
1answer
197 views

How to force a host to not send a broadcast for an IP address in its own subnet?

For a LAN, instead of a switch, I have built a topology where each machine is connected to a router. Each host is assigned an IP address from 10/8. Here are the interface details: Lets say I ping ...
1
vote
1answer
1k views

Configuring ipv6 over radvd using sixxs, routing not working

So this morning, I have been trying to configure IPv6 upon my network using the guide I found on reddit (of all places) at http://ipv6friday.org/blog/2012/06/ipv6-enabling-training/. Now at first ...
3
votes
3answers
7k views

Routing WIFI and LAN for specific traffic

I have two network devices aboard my macbook pro: WIFI (en1): Used for general traffic. Connects to an ip of 192.168.19.* via DHCP LAN (en0): Used for specific traffic. Connects to an ip of ...
5
votes
3answers
4k 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
646 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 ...
0
votes
1answer
250 views

NAT ing to port 80 not working,when request comes to itself

We have a machine with Virtual Machine with local IP NAT ed to Public IPs. When a request comes to public IP on port 80 it will be redirected to VM with local IP. This is the iptable rule we are ...
1
vote
2answers
283 views

Run All Traffic Through a WireShark Box?

I'd like to build a box that I configure as default gateway for client computers that: Captures all of their traffic Allows me to easily review all of their traffic Anyone have some ideas on the ...
2
votes
2answers
803 views

Layer 3 switch routing

I need help moving over to using our layer 3 switch as the inter vlan routing device rather than our cisco router. I've mostly got it working but I've got stuck near the end and need some advice (I ...
1
vote
2answers
616 views

Ubuntu 10.04 Server, 2 NICs in separate Subnets, 1 Router

following configuration: Ubuntu 10.04 Server, 2 NICs: - eth0 192.168.1.215/24, Default GW: 192.168.1.250 - eth1 192.168.3.225/24 Both are connected to the same router (Funkwerk Bintec R3000). The ...
2
votes
1answer
203 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
600 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 ...
1
vote
2answers
2k views

What is the difference between flow control and congestion control at layer 2 and 3? [closed]

Is there a difference between flow control and congestion control at the following layers? layer 2(data link layer) layer 3(network layer) If they are not same, then how is each handled at the ...
0
votes
2answers
2k views

Set up router with 2 WANs and multiple subnets

I'm trying to set up a Debian box as a router for an office. I need to have 3 subnets in the LAN and 2 WAN connections, and I want one of the subnets to ALWAYS use WAN 1 and the other subnet to ALWAYS ...
0
votes
1answer
345 views

Remotedesktop to windows 2008 server with 2 nics

Hi I have 2 NICs on a Windows 2008 R2 Server. nic1 with ip address 192.168.2.1 with gatewaty 192.168.2.254 and nic2 with ip address 10.96.6.253 with no gateway. The windows 2008 server is connected to ...
1
vote
4answers
448 views

Route web browsing through a separate iterface

I'd like to route web browsing through the wlan0 interface and the rest through eth1. Can you please help me with the iptables commands to achieve this. Below is my configuration. Thank you :) Edit: ...
1
vote
1answer
209 views

High latency due to non-presence of a transit provider in my country

My ISP, a state owned incumbent, buys bandwidth from different transit providers. Whenever it buys transits it announces only a specific prefix (in most cases a hitherto unused) through the new ...
0
votes
1answer
310 views

Add IPv6 support to DirectAdmin server

I just set up an new DirectAdmin, and I want to prepare it for IPv6 use. My ISP have gave me an range of IPv6 addresses that I can use. Lets say that address is 2a01:7c8:**:1f::. My neworkadapter ...
0
votes
1answer
282 views

Python: how to calculate data received and send between two ipaddresses and ports [closed]

I guess it's socket programming. But I have never done socket programming expect for running the tutorial examples while learning Python. I need some more ideas to implement this. What I specifically ...
2
votes
3answers
2k views

Isolate clients on same subnet?

Given n (e.g. 200) clients in a /24 subnet and the following network structure: client 1 \ . \ . switch -- firewall . / client n / (in words: all clients connected to one ...
0
votes
1answer
585 views

Are neighbors formed in EIGRP and OSPF always directly connected?

I always thought that neighbors formed in EIGRP were not necessarily directly connected because the only requirement for two routers to be neighbors is that they share the same Autonomous System and ...
0
votes
1answer
145 views

WAN IP address for LAN with public IPs?

Given a computer with 2 network cards, one for WAN, the other one for LAN and some public IPs 123.1.2.0/24. Now the computer shall connect all LAN clients to the outside, without NAT or any further ...
1
vote
3answers
2k views

multiple vlans routed on one nic? trunk?General? or Access?

ok for the last week I've tried racking my head around this... I have a SRW208P with 802.1q support, and a virtual endian appliance. I would like to be able to have 3 vlans having everything routed ...
1
vote
2answers
191 views

Routing subdomains with querystrings

RewriteEngine on Options -Indexes DirectoryIndex index.php RewriteBase / RewriteRule ^user/([a-zA-Z]+)/([a-zA-Z]+)(/)?$ index.php?controller=main&function=$1&arguments=$2 [NC,L] I can go ...
1
vote
2answers
676 views

Cisco IOS PBR - PBRing Skype

I've got a very simple question, which seems to be extremely difficult when put into practice. I have a Cisco IOS router with two Internet links (one over a WAN, through a proxy, everywhere, etc.) ...
0
votes
1answer
2k views

Cisco ASA 5505 Voice/Data VLANs not pinging/routing

Hi i am very new to Cisco ASA 5000 series and have two interfaces that i would like to route between, a data network 192.168.69.0/24 and voice 192.168.70.0/24, I have addded both and can ping the ...
1
vote
1answer
400 views

iptables redirect tcp to checkip.dyndns.org from localhost to 127.0.0.1:8118

I've tried several different combinations of rules and nothing seems to be working. I know that you can't use prerouting table for a request coming from the localhost so I used the output table and ...