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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31
votes
11answers
23k 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 ...
30
votes
4answers
5k views

Why does a hardware router perform better than a Linux router with better specs (RAM & CPU)?

I have a minimal CentOS 6.3, 64 bit acting as gateway with 4 NIC (1 Gbps), each bonded together one for public traffic and other for private, which performs NATing. It has 6 GB RAM and 4 logical ...
29
votes
4answers
2k views

Our wi-fi at work is ridiculously slow, will adding more range extenders improve it?

At work, we have two wireless networks (e.g., Work1 Work2); the Work2 is used downstairs and Work1 is used upstairs. However, both are notoriously slow. The connection is better when we are wired in, ...
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 ...
21
votes
10answers
10k views

Why do I want to run Tomato firmware on my router? [closed]

What is the most compelling reason to flash your router to the Tomato firmware?
14
votes
4answers
54k 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 ...
13
votes
5answers
2k views

How can I split my personal network (with WIFI) from my office network?

I work from my home home office and have a VPN router to my company. I share the same network for my personal and office use. I have a WiFi Access Point, I don't want access to any of my company ...
12
votes
3answers
9k 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?
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 ...
11
votes
13answers
1k views

What decent small-office level routers are there [closed]

So let's say I have a network of less than 20 computers including a server that needs to be accessed externally. What router/firewall solutions would you recommend? It can be either hardware or ...
11
votes
3answers
6k views

Any reason not to enable DoS Defense in my router?

I recently found a DoS Defense setting in my DrayTek Vigor 2830 router, which is disabled as default. I'm running a very small server on this network and I take it very serious to have the server up ...
10
votes
7answers
9k views

Why do I want to run DD-WRT firmware on my router?

What is the most compelling reason to flash your router to the DD-WRT firmware?
10
votes
10answers
5k views

Basic firewall, switch, & router device? [closed]

I am a developer and haven't dealt with server admin or networking in years, so "rusty" is very generous. I am setting up a new web server cluster (starting with two 1U web servers and one DB server). ...
10
votes
2answers
327 views

How to safely install a new IOS image on a Cisco device when the installed flash memory size isn't enough for two of them?

Today I was updating IOS on a Cisco 877 router, and a problem came up: the installed flash memory wasn't enough to hold both the old and the new IOS images, so the new one couldn't be uploaded unless ...
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 ...
9
votes
3answers
1k views

Configuring a router to drop packets, introduce latency, corrupt data

I was wondering if anyone had any experience setting up an environment designed purposefully for poor performance when sending/receiving requests over a network. I'm developing an application and ...
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) ...
9
votes
1answer
1k views

Limit ICMP Per Source IP with IPTables

I have mistakenly thought that the limit module is per source ip, but it appears to be based on all requests: 577 36987 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0 ...
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 ...
8
votes
4answers
1k views

Slow down individual connections passing through a Linux router?

We have a Linux server acting as a router/firewall for our office. Occasionally someone will upload a large file that takes up all our bandwidth. I don't want to implement any complex rules or traffic ...
8
votes
6answers
556 views

Cisco router for educational purposes

I want to buy a Cisco router to use on my home network. I'm just hoping to get a unit that is not too old and is not a SOHO model. I want to run the latest Cisco OS just to learn how Cisco does ...
8
votes
2answers
18k 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 ...
8
votes
4answers
5k views

Linux router: ping doesn't route back

I have a Debian box which I'm trying to set up as a router and an Ubuntu box which I'm using as a client. My problem is that when the Ubuntu client tries to ping a server on the Internet, all the ...
8
votes
4answers
833 views

Wireless AAA for a small, bandwidth-limited hotel

We (the tech I work with and myself) live in a remote northern town where Internet access is somewhat of a luxury, and bandwidth is quite limited. Here, overage charges ranging from few hundreds, to ...
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 ...
7
votes
4answers
994 views

Enterprise grade router, when to get it?

I manage an architect firm of 30 persons. I installed them a 'random' router from bestbuy (about $100). At the time they where 10 architects. Now they've grown to 30+ and are now experiencing a ...
7
votes
4answers
369 views

Why are ISP's installing routers on my site when the feed is a form of ethernet already?

I'm connected to 3 ISP's right now. Two of them already have routers at my site, the third one announced me "they need to install some equipment" when I requested BGP session. I can only assume they ...
7
votes
3answers
2k views

Experiences with BIRD for BGP?

We're currently using Quagga with Debian Linux to run a full table BGP router. The set-up has been dead simple up to now, but we've come to a point where I have to reconfigure the router quite a bit, ...
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 ...
6
votes
2answers
13k views

A nice tool to look up make/model via MAC address?

The first several digits of a MAC address (Ethernet ID) are specific to its manufacturer/model. I won't ask what's the best way to look these up since it's subjective... but I'd love to know if any ...
6
votes
9answers
2k views

Need prosumer router/firewall/vpn/vlan/nat advice [closed]

Looking for a recommendation on a device (or devices I guess) to do router/firewall/vpn/vlan/nat functons for my home network. Right now, I'm doing this with an IPCop box, but I'd prefer a little ...
6
votes
6answers
8k views

What's the difference between a gateway and a router?

Here we can see the router is 67.23.27.187(first hop), but the gateway is 67.23.27.1. What's the difference between a gateway and a router? How does my computer know the IP of the router when only the ...
6
votes
2answers
2k views

Could someone explain why traceroute seems to be skipping a router on my network?

This is probably a very basic question, but I'm hopping someone can explain what's going on to me. I configured our wireless router at work to connect to directly to the router that provides our ...
6
votes
7answers
950 views

Are there any good free Cisco router simulators out there?

I'm just starting some Cisco training and I would like to know if there are any freely available simulators available.
5
votes
10answers
1k views

Very strange home router problem [closed]

For a long time now I've had a very strange problem with my wi-fi network at home. I have a BT Voyager 2100 ADSL modem and an iMac, ageing PowerBook and a PC that connect to it wirelessly. The problem ...
5
votes
3answers
7k views

Hardware alternative to PfSense software Firewall/Router

I have been using PFSense on a PC for about 4 years now for my home network, and it works perfect. I love all of its features and I really cannot complain. Recently though I have been getting tired ...
5
votes
3answers
892 views

Can internet gateways be plugged straight into a layer 2 switch?

tl;dr Internet gateways (eg., cable modems, fiber optic gateways) don't function properly when they aren't behind a device with "layer 3" or routing capabilities, correct? Incredibly long backstory ...
5
votes
4answers
926 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 ...
5
votes
2answers
3k views

Using dd-wrt Dynamic DNS client with CloudFlare

I'm trying to configure Dynamic DNS client on my router with dd-wrt (v24-sp2) firmware so it would dynamically change IP address in one of the DNS records. Unfortunately I encountered a problem… Here ...
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 ...
5
votes
6answers
1k views

Need help diagnosing network performance issues

I am currently working in a developing country as a system analyst for a government department. My area of expertise is software projects, but I've come across a few issues with the network setup in ...
5
votes
4answers
5k views

Can't communicate between lan ports on openwrt router

I've got a WBMR-HP-G300H Buffalo Airstation router on which I've installed the lates OpenWRT software. All is working well (ADSL, WIFI etc) except for one niggle. I can't communicate between lan ...
5
votes
3answers
1k views

AT&T U-verse 2Wire Router - Increase session table limit?

AT&T U-verse VDSL "fiber to the node" 24Mbit down / 3Mbit up 2Wire Router Model 3800HGV-B Software Version 6.1.9.24-enh.tm The 2Wire router appears to have a limit of 1024 TCP and UDP sessions. ...
5
votes
5answers
451 views

Unknown local router stealing DHCP requests

I am in charge of a local network in a dormitory, we have two 50-way switches and using them to connect to some remote router which is not administered by me (it is not in my building). Note: this is ...
5
votes
1answer
493 views

Internet routing table breaks 512,000 routes [closed]

Looks like with all the mass IP grabs as well as subletting of space, things have finally hit the 512K mark. Anyone on the raw end of an upstream router that ran out of route space? How do most ...
5
votes
3answers
8k 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 ...
5
votes
3answers
4k views

Restrict Computer or Users from Internet but allow access to intranet and Windows Update / ePO?

So this may be impossible but I've been asked to try and find something about it. So far nothing I have found is possible. I need to restrict specific machines or user accounts from regular Internet ...
5
votes
1answer
116 views

Route traffic directly between nodes in a cluster

I apologize if this is a really dumb question. Objective Ensure that traffic that is meant to go between nodes in a cluster does not (inefficiently) go outside the cluster and then come back in, but ...
5
votes
1answer
1k views

Draytek Vigor 2820 static IP's

I have a Draytek Vigor 2820 router which is connected to our ADSL provider (British Telecom, BT). We currently have one static IP address which is accessible from anywhere outside of our network and ...
5
votes
2answers
3k views

What do “Unknown SSAP” and “Unknown DSAP” mean in tcpdump?

While trying to fix a problem with intermittently losing internet connection on a machine with a wireless connection to a router, I ran tcpdump and noticed packets with "Unknown SSAP" and "Unknown ...