a device that connects to 2 or more networks and is capable of forwarding data packets into the direction of the ultimate destination based on information read from the packet and internal routing tables.

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32
votes
11answers
24k views

What is the difference between UDP and TCP?

My router has two protocols (and a "both" option) that I can select when setting up port forwarding: UDP and TCP. What is the difference between these two protocols and when would you select one over ...
14
votes
4answers
60k views

What's the maximum number of wifi connections for a single WiFi router?

We've got a Draytek 2829VN Wifi router and I'm wondering how many concurrent connections I should expect a router of this kind to cope with? We are looking to connect 60 iPads! I'd also be ...
12
votes
3answers
1k views

Can you recommend a good intro to iptables?

I have to setup a firewall on a Linux server (all my previous experience is with Windows). My rules are meant to be pretty simple - forbid all, allow some ports with all, allow some ports for specific ...
8
votes
2answers
20k views

Bridging wlan0 to eth0

On arch Linux, I would like to mainly have eth0 (connected to bridged router) share the connection recieved from wlan0, Ive read tutorials but I'm not command sabby as other users are and don't ...
5
votes
3answers
9k views

Cisco 877 as a VPN server?

I have a Cisco 877 router which connects my network to the Internet using an ADSL line, a single public IP address and NAT; the IOS version is 15. Everything is working ok, but I'd like to configure ...
4
votes
11answers
3k views

Small business firewall/VPN device [closed]

What's a good small business (<50 users at a location) firewall and VPN device? Wireless would be a nice addition, and I'm thinking of something in the $1,000 range. This would be for businesses ...
3
votes
2answers
2k views

linux router setup

I a trying to setup a a linux router for the first time and i am struggling with the setup. Here how i want to setup it up: ISP line -> Linux router -> Linksys router -> Lan. Linux router has eth0 ...
4
votes
9answers
12k views

Best solution for Multi-WAN failover (inside & out)? [closed]

Looking for a way to setup 2 ISPs in failover mode, for both incoming & outgoing traffic, for our small (<100 devices) network. The leading contender for now seems to be the Peplink Balance ...
2
votes
1answer
575 views

How come I can't redirect TCP ports on this wireless router?

I am configuring a router to redirect TCP port 5900 (yes, this is for VNC) to a specific IP address on the network. Here is what I have: From a local computer on the same network, I can telnet to ...
4
votes
2answers
344 views

EIGRP neighbors flapping

I have a EIGRP topology set up in GNS3. It looks like this: The neighbor relationship between R7 and R8 is constantly flapping and I cannot figure out why. Hello timers and time delays are all set ...
3
votes
3answers
649 views

Is NAT based on URL possible with port 80?

I only have 1 IP address, but I would like to host 2 websites: www.example1.com and www.example2.com on the same IP. So I was wondering if there is a router/firewall feature that let's me do that?
2
votes
1answer
538 views

Multicast accross the subnets

My application sends some UDP packets on a multicast address. In our office we have 3 subnets connected via routers. Sitting in my subnet I'm able to ping the IP of the other subnet. Will multicast ...
0
votes
1answer
439 views

How to configure Transparent IP Address Sharing (TAS) on a Mediatrix 4102 with DGW 2.0 firmware?

I am making the switch to VoIP. I chose voip.ms as my service provider and Mediatrix 4102 as my ATA. One reason why I chose the Mediatrix over other popular consumer ATAs is that it's supposed to be ...
0
votes
2answers
3k views

amazon ec2 pointing domain name to elastic ip and setup ssl

I am new to amazon ec2 however I managed to run EC2 instance and connect elastic ip to that. Now I bought a new domain name, I thought i need to use amazon route 53 service to point my domain name to ...
0
votes
5answers
736 views

Will a router allow network traffic from a static IP?

We have some servers in a data center but the data center does not offer a DHCP service. We want to have some computers setup with DHCP and others that have static IP's. Currently our WAN cable going ...
-1
votes
2answers
2k views

How to create a public hotspot [closed]

I hope this question is appropriate for this forum. I am looking to create a public hotspot for a restaurant, where the access to the internet is restricted until the user has registered through a ...
22
votes
11answers
11k views

Is anyone else using OpenBSD as a router in the enterprise? What hardware are you running it on? [closed]

We have an OpenBSD router at each of our locations, currently running on generic "homebrew" PC hardware in a 4U server case. Due to reliability concerns and space considerations we're looking at ...
12
votes
3answers
10k views

What's the difference between a switch, a router, and a modem?

What's the difference between a switch, a router, and a modem?
7
votes
7answers
3k views

How do you manage your Linux iptables configuration on a machine acting as a router?

I have a couple Linux machines that act as routers/firewalls for my networks and I have a script that runs all the iptables commands to set my rules. This seems to me like a really silly way to do it ...
8
votes
11answers
2k views

SOHO - throttle bittorrent traffic from problem users

I manage the network in a small office (SW dev is my "real job"), and there are a couple of users who beat the hell out of our internet connection by running bittorrent. Between the almost crippling ...
5
votes
3answers
4k views

Unable to connect on natted server from a host computer on the same LAN using public IP address

I have a server statically NAT’d using a registered IP address and it is accessible from the outside. The problem is I cannot access my server from the inside using the registered IP address with a ...
3
votes
2answers
6k views

QoS for Cisco Router to Prioritize Voice and Interactive Traffic

I have a Cisco 891W NATing Voice and Data to the internet over a 10mbit/2mbit connection. Voice traffic gets degraded when I upload large files. Pings time out as well. I tried to configure a QoS ...
9
votes
3answers
4k views

Is there danger to virtualizing a router?

I had read on a few forums about pfSense that said it was dangerous to virtualize pfSense. The reason that was stated was an attacker could use pfsense as a spring board for an attack on the ...
6
votes
4answers
1k views

Is Selling Old Cisco Routers a Security Issue?

I'm a system admin but I'm not Cisco certified and I'm not a network engineer. Basically I only use switches/routers/modems with a GUI. I've inherited a pile of old Cisco routers that are not in use ...
5
votes
4answers
937 views

Does anyone use DD-WRT/OpenWRT etc. at their office? [closed]

Does anyone use any of the third party router/AP firmwares (DD-WRT, OpenWRT, Tomato, etc.) in an office environment? How many users does it handle well? How long have you been using it? I understand ...
4
votes
3answers
32k views

What is a Cisco BVI interface? What is it used for?

I have been Google'd and searched for the answer to these questions, but I cannot find a simple answer. So my questions are about BVI interfaces. What are they? Why do you use them? In what scenario ...
2
votes
2answers
1k views

Cisco Router - Website Doesn't Work Locally Because Public IP Directs to Router Itself!

I have an RV220W but this issue may apply to other Cisco routers. My website is deployed at public IP address 123.45.67.89/MyWebsite/Default.htm. My web server has an internal IP to which port ...
2
votes
4answers
3k views

Wireless router with vpn server [closed]

I'm searching for a WLAN (Wifi) Router that can be used as VPN server as well for my home office. Any good suggestions?
0
votes
6answers
3k views

cisco router : redirect any dns request to my own dns server

how I can redirect any DNS request from the client with my Cisco Router 2621XM. I want to redirect any dns request to my own dns server. So if the client has set the dns server in their ip address ...
3
votes
3answers
605 views

how to connect 2 independent computer networks?

I have 2 independent networks that are connected to internet. Each systems in a network can connect to the internet through the corresponding router/NAT device. i wish to connect these two LANs. I ...
2
votes
2answers
4k views

Restoring a Cisco router config using a config file

I'm working with a Cisco router over telnet (actually PuTTY), and I'm a newbie to ios. I'm slowly getting the hang of it, but have a very basic question: I have issued a show running-config command ...
2
votes
1answer
173 views

managing and auditing existing cisco firewall access control and routing rules

I'd like to perform audit and maintenance of the existing cisco router and switch configuration before changing to the new ISP and implementing new VLAN features, how do you manage and audit your ...
2
votes
3answers
548 views

Forwarding hostheaders

I have a question about forwarding of the hostheader inside a network. My setup is this: - On the front I have a Linksys router - Behind the router I have 3-4 test webservers with different setups - ...
1
vote
4answers
7k views

How to properly nest a wireless router behind a wired router? [closed]

I wish to repurpose a wireless router to serve as a wireless access point behind a wired router (serving as gateway to WAN) so that I don't have to buy more hardware and recapture value on prior ...
1
vote
1answer
2k views

ESXi Behind Virtual Machine

Just as a follow-up to my previous question: I have an ESXi server that I'm moving into a colocation facility that supplies me a single IP address. I think I'm going to go the route of setting up a ...
0
votes
2answers
192 views

Hosting a bunch of sites on a server with Verizon DSL?

I have 50 demo sites (running on .Net 3.5) that are very resource intensive. So shared hosting or using a Virtual Server is not working out. These sites are not production and do not use a lot of ...
-2
votes
3answers
1k views

D-Link Router “Virtual Servers” with 0.0.0.0 IPs [closed]

I recently erased all of the Virtual Server rules from a D-Link router and added just the ones that I needed (for example I don’t need DNS or NetMeeting, etc.) You can see the defaults on the ...
9
votes
6answers
7k views

monowall vs pfsense

I'm building a router out of a Mini-ITX pc + compact flash card setup and I'm trying to choose a suitable distro. My criteria are: Must be able to run from a CF card (so no excessive disk writes) ...
3
votes
2answers
142 views

VPN Router question

What does it take to set up a wireless router to connect to a vpn service so everybody in the local wireless network surfs the internet through that vpn tunnel? What do I need to be careful about? ...
3
votes
3answers
3k views

How do I configure my router under another to avoid NAT issues?

I'm sorry if this has been answered before; I tried looking but couldn't find a solution. I'll try and explain as clearly as I can. I've recently purchased a Rogers Mobile Rocket Hub and it's ...
3
votes
6answers
2k views

Generating and capturing Netflow on a Linux router

We currently have a dual-NIC Ubuntu server at our data centre acting as the gateway router between our public networks and our ISP. We have a /30 cross connect network on the ISP-facing NIC, and one ...
3
votes
6answers
9k views

Getting an IP's MAC address from behind a router

I want to know, if possible, how to get a MAC address of an IP address if I am behind a router. I tried doing a ping to the IP and checking the arp table, but the only entry is the router's MAC. Any ...
2
votes
1answer
989 views

Does there exist a short range wireless router, or are all 2dBi?

When I look at specs for wireless routers, then I either can't find the signal strength or it is 2dBi per antenna. I am looking for a short range (low antenna dBi) and low throughput (transmitted ...
2
votes
5answers
2k views

Mac laptop crashing wireless router

We have a office with a wireless router - whenever a particular Mac laptop comes in the wireless router needs to be rebooted. Does anyone know the cause of this?
2
votes
2answers
3k views

Best ADSL router with built in secure VPN?

What is the best adsl modem/router with a built in VPN service? How secure is this method with Windows XP clients? Will I be able to log into a Windows domain using this VPN method? Many thanks.
1
vote
3answers
2k views

How to block external access to the DNS service running on a Cisco router?

I have a Cisco (877) router acting as the main gateway for a network; it has a DSL connection and performs NAT from the internal network to its external, public IP address. The router allows SSH ...
1
vote
2answers
1k views

How can I team or balance two DSL connections? [duplicate]

Possible Duplicate: Is there a sensible way of ‘teaming’ two ADSL connections? WARNING: I am NOT a networking professional (obviously, see below) but I am a programmer and have a decent ...
1
vote
1answer
133 views

What router to choose between a 3620 and a 3640 to work with 3500 series switches?

This question is issued from the following: Will a Cisco 2514 router work properly with a Cisco Catalyst 3500 series switch? Following the inner requirements, I have searched for a more recent ...
1
vote
2answers
96 views

Question about port forwarding on router

How to forward from from port 222 to 22 inside local network to ip 192.168.1.103 for example? Have router TPL-Link TL-WR740N_V1 Setting allow to forward only outside port, but not for ip inside ...
1
vote
1answer
5k views

What is strict, moderate and open NAT?

NAT options on domestic routers often come configured as strict. What does this mean? What do moderate or open do? Port-forwarding/DMZ access works properly on strict so why bother with the other two? ...