Questions tagged [router]
A device that connects two or more networks and is capable of forwarding data packets to a destination based on information contained within a packet and internal routing tables.
2,053
questions
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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 cores....
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11
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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 ...
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Bridging wlan0 to eth0
On Arch Linux, I would like to have eth0 (connected to bridged router) share the connection received from wlan0, I've read tutorials but I'm not command savvy as other users are and don't completely ...
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4
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Is there a way to provide user-specific passwords for Wi-Fi?
Is there a way to provide user-specific passwords for Wi-Fi, so that different users have different passwords?
I'd like to provide each user with a different password for my Wi-Fi connection.
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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, ...
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5
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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 ...
user57675
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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 ...
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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?
...
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21
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5
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What's the difference between a switch, a router, and a modem?
What's the difference between a switch, a router, and a modem?
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21
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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?
- 1,507
19
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7
answers
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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 ...
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19
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3
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Slowest wireless client dictates the connection quality of all others?
Not sure if this is the place to ask this, but I couldn't find a more appropriate StackExchange site. I heard that the quality of wireless connection follows the law of the lowest common denominator - ...
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7
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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 ...
wireshark
15
votes
3
answers
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Can you recommend a good intro to iptables? [closed]
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 ...
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3
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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 ...
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14
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5
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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 ...
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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 ...
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3
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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 ...
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1
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Do I really need a DB9-RJ45 adapter to connect to a Cisco router console, and if so, why?
I have an Enterprise grade Cisco router and an HP laptop. I would like to connect to the router on the console port to conduct out-of-band management.
The console port on the router uses an RJ45 ...
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13
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2
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What does the command "ip route" show
These are my outputs from the command ip route
10.1.40.0/24 via 10.255.115.1 dev eth1
10.255.114.0/23 dev eth1 proto kernel scope link src 10.255.115.18
default via 10.1.1.1 dev eth0 metric 100
...
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12
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4
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What happens if two local systems download the same resource on same port?
I'm aware of NAT table. I just want to know what happens if two clients in a private local area network want to download exactly the same resource on the same port? In other words , When a packet ...
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12
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2
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CentOS 6 router/firewall seems to be throttling throughput
TL;DR
CentOS6 NAT router/firewall behind a 120Mbps cable modem connection
seems to be capping throughput at 30Mbps after recent updates and
security "hardening".
Prior to updates and ...
- 854
11
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13
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2k
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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
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2
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Why is nat required when proxy is enough? [closed]
My machine is connected in a local lan. to connect to the internet the traffic goes through proxy server. my understanding of proxy server is that it sends the request on behalf of the original ...
- 317
11
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4
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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 ...
- 439
11
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6
answers
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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)
I'm ...
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11
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3
answers
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How do I get IIS working and accessible outside my network behind a router? [closed]
My machine is running Windows 7 Ultimate. Here's what I've done (successfully) so far:
Installed IIS 7.5 with PHP over FastCGI
Got it working! When I go to http://localhost/index.php , my PHP scripts ...
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7
answers
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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?
- 1,507
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10
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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
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3
answers
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NAT: If two hosts initiate a connection to the same IP:PORT, with the same source PORT, how does the router handle it?
I was just thinking and that idea came to my mind.
Let say I have hosts A and B inside my local area network. I have a Router, and a host C in the internet. I know that when initiating the connection,...
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10
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3
answers
4k
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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, ...
- 1,235
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2
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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 ...
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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 ...
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11
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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 ...
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2
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Using iptables to block ALL outgoing traffic from one NIC?
I must pretty bad at Googling as this seems like a very basic question but I can't seem to find the answer anywhere... and man iptables is a very long read!
I have two NICs - eth0 and eth1 - on a ...
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9
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2
answers
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How to prevent or block other DHCP servers?
Is it possible in a managed switch such as a 3com 4500 or a HP Baseline PWR-Plus type switch to block DHCP from being served through specific ports, or all except 1 port?
I have a DHCP server for ...
- 1,882
9
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4
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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 ...
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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 ...
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8
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7
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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 ...
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What are some ports that are essentially "never" used (super rare port ranges) [closed]
I want to set my port forwarding routes far far away from the normal ports which my computer uses. I asked this question on Google and nothing like it came up, so, here I am.
(this is a subjective ...
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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 ...
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8
votes
4
answers
2k
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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 ...
- 1,729
8
votes
6
answers
811
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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 ...
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4
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12k
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Inexpensive, Reliable Captive Portal [closed]
I do some wifi hotspot installations, and a new client recently asked me if it would be possible to force users to his website when they first open their browsers. After some Googling I figured out ...
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2
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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 ...
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2
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UDP traversal through router automatically without router port forwarding?
Everyone knows the router is working like a firewall. Without port forwarding, a connection (no matter TCP or UDP) cannot be initiated from outside of the router. However, if a user initiate a TCP ...
Jack
8
votes
4
answers
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connect two routers with different subnet
I've seen a lot of questions about this, but haven't really understood/didn't match my issue.
I'm a newbie regarding networking.
I got two routers, both are connecting to the wan (giving them ...
- 276
8
votes
4
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1k
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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 ...
- 295
8
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1
answer
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Configure Juniper M320 as Ethernet/STM transparent converter
There is Juniper M320. We need to move ALL the traffic from one port to another. Everything that comes to one port goes to another and vice versa. No snooping or any other processing is required. One ...
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How does a router get its IP address assigned?
I understand how a device connecting to a router (e.g. 72.73.74.75) gets assigned a local IP address (e.g. 192.168.1.5) using DHCP.
BUT, how does the router itself get the IP address assigned from ...
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