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• How to configure router to give XBox top priority / most bandwidth?

  - by MrSparky

  Hi all - Newbie here so go easy... and apologies in advance if I blow the community etiquette / rules! Here's what I'm trying to do: I have a "D-Link DIR-655 Extreme N" wireless router and an XBox 360 w/ the old-style wireless connection thing (usb attachment)... I want to configure my router / network to give my XBox as much bandwidth as it wants, whenever it wants. I have tried giving the XBox a unique IP (within my network) and then tweaking the router to treat that IP as a top priority application (using the router's QOS stuff). Problem is whenever I turn off the xbox, I can't connect to the network the next time I start it up. It seems the only reliable setting in the XBox is to use "Automatic" for the IP settings within the Network Configuration area. Supposedly the D-Link ships with default settings that attempt to recognize a game console and give it top priority... but i've not seen good results (lots of stuttering / lag when someone else jumps online, etc). Any suggestions? thanks again!

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• Avoid corporate blocked URL's when on Cisco VPN

  - by Marcus

  When I'm on my home PC and on my company VPN I can't get to sites that my company blocks. Is there a way to get around this? Why do my requests to facebook.com go through the VPN? Can you configure your system to, for instance, not go through the VPN for HTTP traffic? Update: We are using Cisco VPN v 5, I'm running on XP

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• Why DELL PowerConnect and Juniper are so rare ? Why do enterprises stick with Cisco ?

  - by Kedare

  Hello ! I have a little question, I'm actually studing IT in France, and when looking on alternative on the very [...] very expensive Cisco equipments, I've found Juniper and DELL PowerConnect pretty attractive on features and price, but I rarely see something else than the classics Cisco/LinkSys, HP Procurve and Netgear.. Why it's so rare to find those switch ? They looks really great but... I've never seen any Juniper or Powerconnect... Why do enterprises stick with the expensive Cisco ? I've tried to find how to buy both, it's quite easy with PowerConnect, everything is on the DELL website, but it looks it's very hard to find Juniper equipments in France :( Thank you !

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• trying to connect to non-standard port over esxi guest network

  - by user52874

  I've got an exsi 5.5 box that has a redhat 6.5 guest and a win7 guest. The guest nics are connected on a vsphere standard switch. There is no connection from the vswitch to an outside physical nic. I can ping between the two boxes, each way. I can successfully psping redhat:22 from the win7 box. I can successfully tcping win7:139 from the redhat box. All firewalls are down on both boxes. I cannot connect from the win7 box to redhat:8003, either via psping redhat:8003, nor telnet redhat 8003, nor by the application client itself. sudo netstat -patn | grep 8003 on the redhat box shows that it's listening on 0.0.0.0. Any thoughts? suggestions?

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• Using 2 Transparent HAProxy for load balancing

  - by Nyxynyx

  We can configure HAProxy to be a transparent proxy by using the guide here, where one of the steps says ...to put the backend servers in a different subnet to the front end clients and make sure that the default gateway points back at the HAProxy load balancer. However when we need to have 2 transparent HAProxy in front of our balanced servers (for redundancy), it seems like this wont work as we can only set one gateway for our balanced servers. What will be the correct way to setup the system such that we can have 2 transparent HAProxy infront of the balanced servers? The main reason for having transparent proxies is the need to find the client's IP addresses over TCP.

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• Adding a Second Wireless Router to an Existing Wired Network

  - by KVCrawford

  I apologize ahead of time, I know this has been asked before, but I'm still having problems...maybe you guys can help. I started out with the basic instructions from the highest-voted answer at http://serverfault.com/questions/41572/adding-a-second-wireless-router-to-my-network The new Wireless router in question is a Linksys Wireless-N Gigabit Router, Model # WRT310N Here are the steps I've taken in setting it up: Plug my laptop into LAN port #2 in the new router. Nothing else is connected at this point Configure the new router to be 192.168.1.200 (the original router is 192.168.1.1, and its DHCP clients are from 192.168.1.100-x.x.x.199) Set the internet connection on the new router to "DHCP Client" Turn off the DHCP server & NAT routing on the new router Plug in a LAN cable from the original router into the LAN port #1 on the new router (NOT the WAN port, nothing is plugged in there) Reset the new router Afterwards, I try to ping 192.168.1.1 from the laptop plugged into LAN port #2 on the new router, with no response. 192.168.1.200 garners no response either. Typing "ipconfig" tells me: Autoconfiguration IP Address: 169.254.198.113 Subnet Mask: 255.255.0.0 Default Gateway: 169.254.198.113 What's going wrong? I appreciate any help!

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• How do the routers communicate with each other ?

  - by Berkay

  Let's say that i want make a request a to a web page which is hosted in Europe (i live in USA).My packets only consist the IP address of the web page, first the domain name to ip address transformation is done, then my packets start their journey through to europe. i assume that MAC addresses never used in this situation? are they? First, my packets deal with many routers on way how these routers communicate with each other?, are router addresses added to my packet headers ? Second, is there a specific path router to router comminication or which conditions affect this route? Third to cross the Atlantic Ocean, are cables used or... ?

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• Use one NIC to create multiple interfaces for Linux KVM

  - by Phanto

  I am working on a thesis research project, and I am having some difficulty figuring out how to make one NIC spawn several "bridge" interfaces such that each KVM VM can be seen on the local network. I am very new to KVM, and am still exploring what it can do. Below is the scenario that I am attempting to make (on a CentOS/RHEL 6 system): Linux KVM Host has 1 NIC (eth0) connected to a switch. Create multiple "bridge" or equivalent interfaces that are spawned off of eth0 that would provide a unique IP for each VM. This is so that each VM can communicate with other hosts on the network, and that other hosts on the network can communicate with the VM. IMPORTANT: I would like iptables on the KVM host to be able to manipulate/control/restrict the traffic that would be sent on those "bridge" interfaces. I would like to create a minimum of three VM's, each using their own unique "bridge" interfaces. I have previously made a br0 interface off of eth0, but unfortunately, I am unable to add any more to it. It appears that you can only bridge 1 interface to the NIC. I would like to bridge many to one. Would a tap device be able to do this? If so, how would it be set up? Effectively, I am attempting to replicate what can easily be created with VirtualBox on Windows, where each VM is given a "bridged" interface, and can live on the network. I want to achieve this very same thing with Linux KVM. Thank You EDIT: To be more descriptive, I want to achieve something that looks like this: This can be found on this page: http://en.gentoo-wiki.com/wiki/KVM#Networking_2 HOST +---------------+ | | KVM GUEST1 | | +--------------+ | +------+ | | | LAN ---+--- eth0 | +--+---+---- nic0 | KVM GUEST2 | | tap0----+ | |192.168.1.13 | +--------------+ | | tap1----+ | +--------------+ | | | +------+ | | | | | br0 +--+----------------------+---- nic0 | |192.168.1.12 | |192.168.1.14 | +---------------+ +--------------+

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• How should I isolate computers with different roles on a network

  - by fishhead

  I work in an industrial plant and we have one network(physical wire) that us used for both office usage and for process systems. The office computers are only used for typical office needs but occasionally do connect to the process computers to obtain information from a sql server or for some other purpose. A new initiative is in the works and is rolling down hill from corporate and that is to standardize how the the computers are used at work and they would be severely locked down and only a standard set of applications will be allowed to execute. one of the requirements is to also have non office computers isolated from the company domain. our non-office computers are a mix of Man-Machine interfaces and sql-servers all running software that non standard. My question is, how can we divorce the control systems computers from the company domain but still have access to the servers from the company domain. thanks

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• How should I isolate computers with different roles on a network

  - by fishhead

  I work in an industrial plant and we have one network(physical wire) that us used for both office usage and for process systems. The office computers are only used for typical office needs but occasionally do connect to the process computers to obtain information from a sql server or for some other purpose. A new initiative is in the works and is rolling down hill from corporate and that is to standardize how the the computers are used at work and they would be severely locked down and only a standard set of applications will be allowed to execute. one of the requirements is to also have non office computers isolated from the company domain. our non-office computers are a mix of Man-Machine interfaces and sql-servers all running software that non standard. My question is, how can we divorce the control systems computers from the company domain but still have access to the servers from the company domain. thanks

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• public key infrastructure - distribute bad root certificates

  - by iamrohitbanga

  Suppose a hacker launches a new Linux distro with firefox provided with it. Now a browser contains the certificates of the root certification authorities of PKI. Because firefox is a free browser anyone can package it with fake root certificates. Can this be used to authenticate some websites. How? Many existing linux distros are mirrored by people. They can easily package software containing certificates that can lead to such attacks. Is the above possible? Has such an attack taken place before?

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• how does ospf control flooding?

  - by iamrohitbanga

  what method is used by ospf protocol to prevent looping of flooded packets for link state advertisements? The packet header does not contain any timestamp. How do the routers recognize that it is the same advertisement that they sent before?

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• SOHO NETGEAR wireless router disconnects when downloading torrents

  - by Lirik

  I have a NETGEAR WGT624 wireless router at home which dies when there is a heavy torrent load. I open up my torrent client and it downloads for about 5 to 10 minutes and it continues to increase the number of seeds (goes up to 70-80 seeds), but after that the router simply fails and I have to restart it in order to get an internet connection again. When I connect directly via an ethernet cable the router and open up the torrent client, then it seems to be doing fine, but when I go wireless then the router stops working properly (although all the lights are still blinking as normal). Is there any way that I can fix this? New router firmware? Change some router options? Feed it a cookie? Anything?

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• Social network for internal company use

  - by khelll

  I'm seeking a social network app for employees in the company that can do the following: allows people to communicate within a company or across everyone on the social network (they can have access to a group or to everyone) post and archive interesting links, documents, etc. start a thread that goes to a group or to everyone lookup people’s info (profile) integrate w email so I can know if someone posts something new or responds to a questions Open source + customized deployment is a plus.

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• How to selectively route network traffic through VPN on Mac OSX Leopard?

  - by newtonapple

  I don't want to send all my network traffic down to VPN when I'm connected to my company's network (via VPN) from home. For example, when I'm working from home, I would like to be able to backup my all files to the Time Capsule at home and still be able to access the company's internal network. I'm using Leopard's built-in VPN client. I've tried unchecking "Send all traffic over VPN connection." If I do that I will lose access to my company's internal websites be it via curl or the web browser (though internal IPs are still reachable). It'd be ideal if I can selectively choose a set of IPs or domains to be routed through VPN and keep the rest on my own network. Is this achievable with Leopard's built-in VPN client? If you have any software recommendations, I'd like to hear them as well.

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• Debugging IO limitation

  - by Martin F

  I have a Fedora box with some severe IO limitations which I have no idea how to debug. The server has a Areca Technology Corp. ARC-1130 12-Port PCI-X to SATA RAID Controller with 12 7200 RPM 1.5 TB disks and a Marvell Technology Group Ltd. 88E8050 PCI-E ASF Gigabit Ethernet Controller. uname -a output: 2.6.32.11-99.fc12.x86_64 #1 SMP Mon Apr 5 19:59:38 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux The server is a file server running Nginx with the stub status module enabled, so I can see the current amount of connections. The problem present itself when I have a high number of simultaneous connections in a writing state. Usually around 350, at this very moment it's at 590 and the server is almost unusable and stuck at 230mbit/s. If I run stop and hit 1 to see CPU core usages I have all 4 cores with around 99% io wait, if I run iotop the nginx workers are the only processes producing any read load, currently at around 25MB/s. I have each of the workers bound to their own core. Initially I figured it was just the disks being bugged. But I've run fscheck and smartmontools checks and found no errors. I also ran an iozone test which you can see the result of here: http://www.pastie.org/951667.txt?key=fimcvljulnuqy2dcdxa Additionally, when the amount of connections are low I have no problem getting a good speed. If I wget over the local network it easily hits 60MB/sec. Right now I just tried putting a file in /dev/shm, then I symlinked a file from the public dir to it and used wget over the local network and only got 50KB/s. Also, if I try to cp /dev/shm/test /root/test it quickly copies around 740MB and then slows down HEAVILY. Again with iotop reporting 99% iowait. I'm not really sure how to go about figuring out what the problems are. It could be a natural disk limitation but then the file from /dev/shm ought to transfer so it seems there's a network limit, but that's fine when there's not many connections. Perhaps it's a TCP stack problem but I really have no idea how to check that. Any suggestions on how to proceed with debugging would be very welcome. If additional information is required then let me know and I'll try to get it. Thanks.

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• Connecting a Mac to the office network

  - by user36501

  Hi All, I am busy preparing to start working with a Mac at work - in addition to my old PC. Just wondered, is it difficult to setup the Mac to run on the office network - i.e. does it need any special settings or servers or anything like that? and also printers...can I use the network printer as normal. I am just pottrying to think ahead of any ential issues. Also share drives...will I be able to access share drives and my backups to these shares drives - all a bit daunting! Btw in case you didn't notice I am a Mac Nube lol

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• what causes drops in apache throughput?

  - by Robbie Mckennie

  i was poking around in the windows task manager, and i found this cool network throughput graphing thing. so i wanted to see it max out, so i started downloading a 1.8gb image (from the localhost to a remote system). but, much to my surprise, it looked like this: i count 16 dips, so i divided the 1.8gb into 16 and i got 115mb. then i looked up the mtu of ip, and i knew the mtu of ethernet from my reading, both far smaller than 115mb. and since tcp is connection orientated, it doesn't have an mtu.

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• Trying to understand why VLANs need to be created on intermediate switches

  - by Jon Reeves

  I'm currently studying for the Cisco switching exam and having trouble understanding exactly how 802.1q tagging works. Given three daisy chained switches (A,B, and C) with trunk ports between them and VLAN 101 defined on both end switches (A and C), I'm not sure why the VLAN also needs to be defined on the middle one (B)? Note that I am not disputing that it does need to be configured, I'm just trying to understand why exactly. As I understand it, traffic from VLAN 101 on switch A will be tagged as it goes through the trunk to switch B. According to the documentation I have read, trunks will pass all VLANs by default, and the .1q tag is only removed when the frame leaves through an access port on the relevant VLAN. From this I would expect switch B to simply forward the tagged frame unchanged through the trunk to switch C. Can anyone shed some light on how switch B processes this frame and why it does not get forwarded through the other trunk ?

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• Wireless mouse keeps freezing when using whole network bandwidth

  - by Ümit AKKAYA

  Hi i have wireless mouse and keyboard connected to pc with USB receiver. When i downloading something without limiting download speed, mouse and keyboard keep freezing randomly. Mouse : Microsoft Wireless Mouse 5000 Keyboard : Microsoft keyboard 3000 v2 Chipset : Intel HM65 Processor : Intel Core i7 2670QM @ 2200MHz Physical Memory : 8192MB (2 x 4096 DDR3-SDRAM) OS : Win 7 x64 Note : The solution described in http://superuser.com/a/309622/157168 not helped.

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• Mac claims to have connected to wireless network, but hasn't

  - by Mick

  I am attempting to connect a new mac OSX 10.6.5 laptop to a wireless network (I am a windows expert but a mac novice). It used to connect without problem to the network when I had the security set to "64 bit wep". Now I have changed the security on my belkin router to "WPA-PSK (no server)". I have two PC's and an old mac connecting via the new security setting without problem. Now I have the problem that on the new mac, the wireless icon is indicating a good connection (5 dark bars). Also the network name has a tick next to it on the wireless drop down menu. But I can not view any websites. I can not even connect to the router by typing 192.168.2.1 into a browser address bar. Any ideas where I went wrong?

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• Extending home network using multiple access point originating from another access point

  - by cyberjar09

  I have a home network with the current setup (RJ45 running from main router to access point) : +-------------+ +--------------+ | 192.168.2.1 | |192.168.2.2 | | router +--------------->access point 1| +-----^-------+ +--------------+ | | +-----+--------+ | 192.168.1.1 | | modem | +-----^--------+ | | | | +--+--+ | ISP | +-----+ However I would like to extend the network to two more floors in the house via the existing Access Point (router is too far and not reachable using a network cable, hence I need to extend using current access point). Please see diagram below : +-------------+ +--------------+ +----------------+ | 192.168.2.1 | |192.168.2.2 | | 192.168.2.3 | | router +--------------->access point 1+----------> access point 2 | +-----^-------+ +--------+-----+ +----------------+ | | | | +-----+--------+ | | 192.168.1.1 | | | modem | | +-----^--------+ | +----------------+ | +----------------> 192.168.2.4 | | | access point 3 | | +----------------+ | +--+--+ | ISP | +-----+ Q1 : is this setup possible? Q2 : if possible, will I have to do anything different from what I did to setup access point 1? edit 1 : I am trying to study the dd-wrt documentation to see which would be the correct mode of operation for me Linking Routers but Im confused because I dont see any info on how to use an existing Access point to extend the signal of the SSID. If anyone could point me to the correct wiki for how I should setup AP2 and AP3 based on AP1, it would be very helpful. For AP1, I did the following Use static IP and setup same SSID as primary wireless router use same security as primary wireless router make AP1 point to 192.168.2.1 (primary router) for DHCP Thanks in advance.

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• Trying to understand Wireless N vs Wireless AC

  - by EGHDK

  Whenever a new wireless standard gets approved you expect faster speeds and longer range. From everything that I've read about it, it seems that AC will only transfer over the 5GHz band and up to 3Gbps. Studying the new AC routers on the market, it seems that they will transfer over 5GHz and 2.4GHz. And 5GHz will only transfer at 1.3Gbps. Which isn't what AC is supposed to be. I know there is a difference between what the standard actually says, and what products will actually do, but is there any reason for this? Is there any other main differences between AC and N? I've heard people discussing AC and saying that it's finally "fixing" what N was supposed to fix... what do they mean by that? Any security benefits? I have seen this image online: Will AC really do that? Will that require an AC network card in my laptop for that to actually happen? Lastly, will the router only be able to communicate with AC devices if I have beamforming technology on? I know it's a ton of questions, but most articles online seem to be outdated, and don't provide too much reliability.

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• Throughput; capacity planning help for C10K like design

  - by z8000

  I am designing a network service in which clients connect and stay connected -- the model is not far off from IRC less the s2s connections. I could use some help understanding how to do capacity planning, in particular with the system resource costs associated with handling messages from/to clients. There's an article that tried to get 1 million clients connected to the same server [1]. Of course, most of these clients were completely idle in the test. If the clients sent a message every 5 seconds or so the system would surely be brought to its knees. But... How do you do less hand-waving and you know, measure such a breaking point? We're talking about messages being sent by a client over a TCP socket, into the kernel, and read by an application. The data is shuffled around in memory from one buffer to another. Do I need to consider memory throughput ("5 GT/s" [2], etc.)? I'm pretty sure I have the ability to measure the basic memory requirements due to TCP/IP buffers, expected bandwidth, and CPU resources required to process messages. I'm a little dim on what I'm calling "thoughput". Help! Also, does anyone really do this? Or, do most people sort of hand-wave and see what the real world offers, and then react appropriately? [1] http://www.metabrew.com/article/a-million-user-comet-application-with-mochiweb-part-3/ [2] http://en.wikipedia.org/wiki/GT/s

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• Multiple Set Peer for VPN Failover

  - by Kyle Brandt

  I will have two Cisco routers at Location A serving the same internal networks, and one router in location B. Currently, I have one router in each location with a IPSec site-to-site tunnel connecting them. It looks something like: Location A: crypto map crypto-map-1 1 ipsec-isakmp description Tunnel to Location B set peer 12.12.12.12 set transform-set ESP-3DES-SHA match address internal-ips Location B: crypto map crypto-map-1 1 ipsec-isakmp description Tunnel to Location A set peer 11.11.11.11 set transform-set ESP-3DES-SHA match address internal-ips Can I achieve fail over by simply adding another set peer at location B?: Location A (New secondary Router, configuration on previous router stays the same): crypto map crypto-map-1 1 ipsec-isakmp description Tunnel to Location B set peer 12.12.12.12 set transform-set ESP-3DES-SHA match address internal-ips Location B (Configuration Changed): crypto map crypto-map-1 1 ipsec-isakmp description Tunnel to Location A set peer 11.11.11.11 ! 11.11.11.100 is the ip of the new second router at location A set peer 11.11.11.100 set transform-set ESP-3DES-SHA match address internal-ips Cisco Says: For crypto map entries created with the crypto map map-name seq-num ipsec-isakmp command, you can specify multiple peers by repeating this command. The peer that packets are actually sent to is determined by the last peer that the router heard from (received either traffic or a negotiation request from) for a given data flow. If the attempt fails with the first peer, Internet Key Exchange (IKE) tries the next peer on the crypto map list. But I don't fully understand that in the context of a failover scenerio (One of the routers as Location A blowing up).

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