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• Network topology for both direct and routed traffic between two nodes

  - by IndigoFire

  Despite it's small size, this is the most difficult network design problem I've faced. There are three nodes in this network: PC running Windows XP with an internal WiFi adapter.Base station with both WiFi and a Wireless Modem (WiModem)Mobile device with both WiFi and WiModem The modem is a low-bandwidth but high-reliability connection. We'd like to use WiFi for high-bandwidth stuff like file transfers when the mobile is nearby, and the modem for control information. Here's the tricky part: we'd like the wifi traffic to go directly from the mobile to the PC, as rebroadcasting packets on the same WiFi channel takes up double the bandwidth. We can do that with a manual configuration by giving the both the PC and the base station two IP addresses for their WiFi interfaces: one on a subnet shared with the mobile, and one on their own subnet. The routes on the PC are set up so that any traffic going to the mobile via WiModem goes through the secondary IP address so that return traffic from the mobile also goes through the WiModem. Here's what that looks like: PC WiFi 1: 192.168.2.10/24 WiFi 2: 192.168.3.10/24 Default route: 192.168.2.1 Base Station WiFi 1: 192.168.2.1/24 WiFi 2: 192.168.3.1/24 WiModem: 192.168.4.1/24 Mobile WiFi: 192.168.3.20/24 WiModem: 192.168.4.20/24 We'd like to move to having the base station automatically configure the mobile and PC, as the manual setup is problematic when you start having multiple mobiles and PCs. This means that the PC can only have 1 IP address and needs to be treated as being pretty simple. Is it possible to have a setup driven by DHCP on the base station that is efficient with bandwidth?

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• Sharing internet through a wireless ad-hoc in Windows 7

  - by vzait

  I'm actually requesting a workaround to share a PPoE wired Internet connection between two laptops using wireless. I've tried sharing it the usual way... New Ad-hoc = Click turn On sharing = etc. I've tried changing all the settings I could find related to the two networks on both machines. Conclusion: Sometimes it works, sometimes it doesn't. Is it really buggy, or are my hands growing from the wrong place? I'm almost sure I'm not the only one having this kind of problem. What is the easiest/correct workaround ?

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• Measure Upload Speed between a client and our server

  - by tresstylez

  We host a SAAS application specially customized for multiple clients. For one customer in particular -- they are reporting sporadic performance issues from various locations on their network, in particular UPLOADING documents through a form on our website. The client claims they have "bandwidth to spare" and that utilization of their "pipe" is so low that it MUST be our application, but our application has MANY clients and all features are working fine for all other clients. Interestingly enough -- DOWNLOADS (ie. just accessing the website, or downloading documents) is working fine. Speed test shows that they should get 1.2Mbps UP. So, a 3MB file should take 20 secs to upload. It takes 60+ seconds on their network. Sometimes even small files take OVER 10 minutes to upload or they timeout. Pings and Traceroutes don't show any abnormally long hops or response times. They claim other SAAS applications they use allow them to upload just fine. Both IT teams are working together to resolve this issue. What kind of data can I request from the clients to begin ruling things out. Seems like we need to somehow measure LATENCY of the networks involved or even at the switch level, we need to understand if packets are getting dropped somewhere and why. Where should I start? Any help is appreciated. I'll provide more info upon requests

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• Limited connections to Ubuntu 12.04 server

  - by Luis M. Valenzuela

  I'm having a weird problem with my server. The server is inside my network, connected to a 3com switch which is connected to the router that handles the internet connection. The main purpose of the server is to host a php application. What's happening is that user 1 to 15 in the private network have no problems connecting to the server, when user 16 tries to connect a time out comes out and is unable to connect to the server. It's not just to the php application, but to any service from the server. When the 15 users are using the application, the server doesn't even answer to ping. I haven't set any special limit in Apache's ini file or MySql and the firewall is being turned off because the server is only to give service to the internal network. Is there a parameter in any of the network's card conf. files that might me causing this ? Or should I suspect from the router's or switches configuration ? UPDATE. Tomorrow, I'm gonna do some test on the server modifying two kernel params in : /etc/sysctl.conf The settings are: net.core.somaxconn which has the limit on simultaneous network connections to the server and kernel.shmmax which controls the amount of memory the system can use for managing connections.

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• How to use aliases for remote hosts when accessing locally

  - by alexloh

  I would like to use an alias for a remote host. For example, when instead of "ping giraffe.foo.bar.com" I want to do "ping giraffe", but only when I do it from my own machine. I am able to do this for raw IP addresses by adding an entry in /etc/hosts (ie "123.456.1.0 giraffe"), but it does not seem to work for host names.

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• Customer site is out of IP addresses, they want to go from /24 to /12 netmask... Bad idea?

  - by ewwhite

  One of my client sites called to ask me to change the subnet masks of the Linux servers I manage there while they re-IP/change the netmask of their network based on a 10.0.0.x scheme. "Can you change the server netmasks from 255.255.255.0 to 255.240.0.0?" You mean, 255.255.240.0? "No, 255.240.0.0." Are you sure you need that many IP addresses? "Yeah, we never want to run out of IP addresses." A quick check against the Subnet Cheat Sheet shows: a 255.255.255.0 netmask, a /24 provides 256 hosts. It's clear to see that an organization can exhaust that number of IP addresses. a 255.240.0.0 netmask, a /12 provides 1,048,576 hosts. This is a small < 200-user site. I doubt that they'd allocate more than 400 IP addresses. I suggested something that provides fewer hosts, like a /22 or /21 (1024 and 2048 hosts, respectively), but was unable to give a specific reason against using the /12 subnet. Is there anything this customer should be concerned about? Are there any specific reasons they shouldn't use such an incredibly large mask in their environment?

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• How can I create a VLAN on my extreme switch for a seperate subnet/domain?

  - by drpcken

  I'm putting together a small active directory implementation for a buddy of mine. I currently have 2 servers (one is the primary domain controller) and a couple clients. I need to test and run updates on every machine on this domain, but I would have plug them into my current LIVE domain to get it internet access. From what I've read having two separate domains on a single subnet is a bad idea (even though it is temporary) so I don't want to risk messing anything up on my production domain. I'm pretty sure I can create a separate VLAN on my extreme 48 port switch and plug this smaller domain into it on a different subnet, but I don't know the commands. Both subnets would need internet access of course (one of the things I can't wrap my head around is routing internet traffic between subnets (gateway is on production subnet). My production domain is on subnet 192.168.200.0. My new domain I want to put online would go into subnet 192.168.10.0. A shove in the right direction would be greatly appreciated. Thank you!

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• Linux Mint on VirtualBox has no internet connection

  - by Martin

  Physical machine: Mac Mini running OSX 10.7.5 Virtual machine: Linux Mint 15 Cinnamon 64-bit Using VirtualBox. I am trying to make the linux connect to the internet. For some reason I can access the host computer with 192.168.2.100. Its set up to show me a web-page that says "It works". This I can see from the linux. But I cannot reach anything on the internet. Either FireFox says "Unable to connect" or when I run nslookup google.com I get connection timed out; no servers could be reached. My setting on VirtualBox under the Network tab are: Bridge Adapter vnic0 promiscouos Mode:Allow All`. If it makes a difference, the host has a WiFi connection to the home router. What have I missed?

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• How to build a private Wi-Fi Network server with VMware?

  - by Maarten Schermer

  For a school project, we have to build a Private network with VMware vSphere , which we can connect to with a Username and Password. On the network we want to create a folder for each Useraccount. Also we must have add a few groups (Admin,Customer,Manager). We must be able to connect to our network via the school Wi-Fi. We want to build a safe and secure network, with an easy way to access the network. Do you have any tips on how to approach this?

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• Looking for a router with multiple WAN ports and load balancing

  - by Cyrcle

  I'm going to be moving in a few months. The location I'm moving to is great except it's on a road with very few people, so the internet access option is limited to DSL at 1.6Mbps down, 384kbps up. This is much slower than I'm used to. One option is to get at least two of the DSL lines. There's also good possibility that I'll be able to get WiMax or similar. I've been looking around a bit and it seems like what I need is a load balancing router with multiple WAN ports. Can anyone recommend some good ones? I could also go with a small power efficient Linux box with multiple NICs. What would be good software for that? It'd need to be able to handle around 10Mbps. Thanks for any help

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• VmWare - Internet connection not available in Virtual machine

  - by n0v1c3c0d3r

  I'm using VMWare. My host machine has internet connection. I have selected NAT in the virtual machine settings. What else do I need to do to get internet connection in virtual machine.

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• convert home phone wiring to Ethernet

  - by aaa

  can i convert phone wiring in walls to act as only Ethernet network cause the phone wiring is not in use and not connected to the phone company so there is no voltage in the wires i remove the wall plate and i find 6 wires blue,blue/white,green,green/white,orange,orange/white , and i know that Ethernet use 8 here is what i am thinking get Ethernet cable cut it in half and attach wires from wall to the first computer and the same with the other computer so if this is possible do i just attach wires in the same color and ignore brown wire or do i have to rearrange wires , and how much the speed will be thank you in advance

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• Can I use two internet connections simultaneously in Windows 7?

  - by Chibueze Opata

  I have two internet connections - one via a 3G modem, and the other via wireless. The modem is faster so I normally browse with it, but it does not support torrent downloads while my wireless does. When the two are connected, my PC automatically makes every connection through the modem. Is there a way I can force a particular program, eg. uTorrent to browse through my wireless internet connection instead? Thanks.

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• xtreamer doesn't see Window 7 shares

  - by Assaf Lavie

  Weird situation after reinstalling Windows 7 on my PC. Suddenly the xTreamer (media streamer) that's connected to the same LAN doesn't see shares by my PC. Other PCs (and even a MacBook) on the same network can access these shares just fine. And the xTreamer is capable of seeing other shares in the network (e.g. by some other NAS server I have). It can't be permissions/firewall because the Mac does connect to the shares... I'm stumped. Ideas?

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• Monitoring instantaneous network throughput at one second intervals?

  - by Shaddi

  For a testing setup I have, I need to monitor the throughput through a "router"* at regular intervals of around 5 seconds or less (sub-second intervals would be very nice, but not required). Ideally, I would be able to generate a file which contained both the number of bytes and packets seen during each interval. I will eventually be generating a time-series of throughput from this data. On a previous setup using an older version of FreeBSD, there was a tool called "bpfmon" which gave me this information. However, I need to do this under a modern version of Linux (namely, Ubuntu 11.04). I have looked at both iptraf and iftop, but these do not appear to provide the resolution I need, nor do they seem to easily allow scraping the data I need. I understand iptables statistics may be able to give me what I'm after, but the examples I've seen of this seem to rely on repeatedly reading and resetting traffic counters, which seems like it could give inaccurate as read/reset is not an atomic operation. I already capture a tcpdump trace of the traffic I'm interested in on the link I want to monitor, so I am open to approaches which simply parse that. I feel like this must be a common problem though, so I am hoping there will be a standard "best practice" tool for accomplishing this. *I say "router" in quotes because I am really talking about a machine with two bridged NICs through which all the traffic I'm interested in passes.

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• How frequent are network partitions on cloud services?

  - by roja

  Much is made of the CAP trade-off for data storage where conflicts can be introduced if there is a network partition. My question is there any evidence that this is a problem that arises with any significant frequency in modern cloud IAAS services e.g.; EC2, Azure, Rackspace. Is it a problem which, despite being a theoretical roadblock in constructing idealised distributed systems is, in fact, a non-issue for all practical concerns? Has anyone experienced a network partition within one of these systems (within a single data-centre?) If so would you be willing to share any details?

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• nmap reports host up when it isn't

  - by martianway

  On an Ubuntu VM I ran: sudo nmap -sP 192.168.0.* This returned: Starting Nmap 5.00 ( http://nmap.org ) at 2010-12-28 22:46 PST Host 192.168.0.0 is up (0.00064s latency). Host 192.168.0.1 is up (0.00078s latency). Host 192.168.0.2 is up (0.00011s latency). . . . Host 192.168.0.254 is up (0.00068s latency). Host 192.168.0.255 is up (0.00066s latency). The problem is I only have 4 live machines on 192.168.0.* so why did nmap report every ip in the subnet has a live host? The ip address of the Ubuntu machine is 192.168.28.131 From this VM I can ping the live systems on my internal subnet 192.168.0.* and get the expected response. And if I ping a machine that doesn't exist I can get no response as expected.

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• Ubuntu 10.04 network manager issues

  - by Shark

  I was using the default network manager to connect to my wi-fi network, but if the connection is dropped or router restarted the network manager wont reconnect automatically after i guess a couple of tries and just gives a pop-up to connect manually . To avoid this annoyance I installed WICD but though it does try to reconnect to the network after a drop in connection it is unable to resolve the ip address and i am left with an even bigger annoyance . 1. Is there a way to counter either of these issues ? 2. Something like a background process that will check network status periodically and then try to connect to a favored network ? Edit- out put of lshw -C network *-network description: Wireless interface product: Broadcom Corporation vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:12:00.0 logical name: eth1 version: 01 serial: c0:cb:38:18:9b:7f width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=wl0 driverversion=5.60.48.36 ip=192.168.11.2 latency=0 multicast=yes wireless=IEEE 802.11 resources: irq:17 memory:fbc00000-fbc03fff *-network description: Ethernet interface product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller vendor: Realtek Semiconductor Co., Ltd. physical id: 0 bus info: pci@0000:13:00.0 logical name: eth0 version: 02 serial: f0:4d:a2:94:2d:74 size: 10MB/s capacity: 100MB/s width: 64 bits clock: 33MHz capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half latency=0 link=no multicast=yes port=MII speed=10MB/s resources: irq:29 ioport:e000(size=256) memory:d0b10000-d0b10fff(prefetchable) memory:d0b00000-d0b0ffff(prefetchable) memory:fb200000-fb21ffff(prefetchable)

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• How to Configure Different Gateways for Different VLANs

  - by Bryan

  I have around 10 VLANs, and two different internet gateways. I want traffic on some VLANs to use one gateway, and traffic on other VLANs to use another gateway. (e.g. I wish to route server traffic via one gateway and desktop internet traffic down another). Is it possible to configure different default routes for different VLANs on a Dell 6224 switch? Or is their a better way of doing what I'm trying to achieve? The core switch I am using is a Dell PowerConnect 6224 switch. Currently I'm using: ip route 0.0.0.0 0.0.0.0 10.58.3.16 which creates the default gateway for all VLANs. I did consider adding multiple routes with equal metric, and setting ACLs between the VLANs to deny access to the 'wrong' gateway, but that idea just doesn't feel right to me.

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• How to setup wireless radio to network using 2 nics?

  - by CptanPanic

  I am having problems setting up this network, hopefully someone can help me. Laptop <- Wireless Radio <- ... - Wireless Radio <- CPU1( NIC1,NIC2) <- SWITCH <- CPU2 I have a computer with 2 NICs (CPU1). One goes to a wireless radio that connects to a wireless laptop, the other NIC goes to network switch. I can't connect Wireless Radio to switch due to space constraints. All the machines and radios are on same network addresses. I tried using Window's Bridge network which did allow Laptop to reach CPU2, but not CPU1. What is the way to get this to work so all the computers can talk to each other?

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• Joining a network with a Virtual Windows Server 2008 R2

  - by Triztian

  Hi all, here's my case, I have set up a share in a virtual windows server 2008 R2, the server is hosted by GoDaddy my question is, how do I access the server's public folders, I need to open a file locally (on the client) and to do that I need the server to show up in my Network locations, I have the right credentials and have created a special group that has access to the particular folder that I'm sharing the problem is I don't know how to add the server to my network locations. I have tried VPN Connection but it is my understanding that it cannot be done since it is virtual share server. Any help is trully appreciated.

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• convert home phone wiring to Ethernet

  - by aaa

  can i convert phone wiring in walls to act as only Ethernet network cause the phone wiring is not in use and not connected to the phone company so there is no voltage in the wires i remove the wall plate and i find 6 wires blue,blue/white,green,green/white,orange,orange/white , and i know that Ethernet use 8 here is what i am thinking get Ethernet cable cut it in half and attach wires from wall to the first computer and the same with the other computer so if this is possible do i just attach wires in the same color and ignore brown wire or do i have to rearrange wires , and how much the speed will be thank you in advance

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• unable to start apache after changes to rc.conf and resov.conf

  - by shupru

  I had a working configuration this morning with the following simple /etc/rc.conf ifconfig_rl0="DHCP" ifconfig_xl="inet 192.168.1.11 netmask 255.255.255." defaultrouter="192.168.1.1" I added the following lines: firewall_enable="YES" firewall_type="SIMPLE" firewall_logging="YES" sshd_enable="YES" apache_enable="YES" mysql_enable="YES" my httpd.conf includes: NameVirtualHost 192.168.1.11 <VirtualHost 192.168.1.11> ... </VirtualHost> now apache and ssh server are down. changed rc.conf back to last working configuration and still no ssh or apache apachectl start #--> /usr/local/sbin/apachectl start: httpd could not be started apachectl status #--> Looking up localhost Making http connection to localhost Alert!: Unable to connect to remote host.

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• Network load balancing, efficience and limits?

  - by Vimvq1987

  I'm about to study about NLB on Windows Server 2003. It archives both of my interests now: scalability and high-availability. But I don't know about its power in production environment. Is NLB a efficient solution? How does it implement in real-world? Is it popular? What are its limit? Thank you so much for answering my questions. :)

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• No Drivers in Ubuntu 9.1!!!

  - by Chris

  I have a Lenovo G550 and I installed Ubuntu on it through Windows and I have no drivers. No sound, no wireless. I previously had installed it through Windows Vista with no problems at all. I now run Windows 7 and cannot seem to get it to function properly. I tried installing the recommended drivers to make sure the proper ones were installed and that still did nothing. Any one have ANY idea what could be happening? I just don't feel like dealing with it.

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