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  • Router recommendation to virtualize 800 IPs

    - by delerious010
    I've recently been looking at getting some new load balancers for our environment as we are expecting to double our client base in the next 12 months. Currently we have 400 public IPS serving 800 clusters ( 2 clusters / IP due to ports ) on Coyote Point Balancers, and distributing connections to 3 web servers serving about 6GBytes outgoing, 2Gbytes in per day. If we double, this would be about 800 IPs, possibly 1600 clusters, and about 6 servers per cluster ( for a total of 9600 so called "real servers" using Barracuda's lingo ). Due to the amount of clusters, most solutions I've looked at ( Coyote, Barracuda, Loadbalancer.org ) seem to be unsure whether they'll be able to handle our planned growth, mostly due to health checks performed on the servers ... which makes total sense when you think of it. So the fine folk at loadbalancer.org recommended that we may be better off offload the 400-800 public IPs, which we require for SSL eCommerce solutions, over to a forward facing router. From that point on, the router could do some mangling to route EXT_IP:443 to INT_IP:INT_PORT which would then allow us to reduce the Load Balancer configuration to 1 or 2 clusters, thus resolving the health check problem. Does this idea make sense to yall ? Or would you have other recommendations to make ? Secondly, what router would you recommend for such an undertaking ? I'd be looking at something that has some form of failover mechanism built in. On a totally unrelated note, I've got to admit that I'm extremely pleased with the responses I got from loadbalancer.org. Their responses to my inquiries were surprisingly helpful ( i.e. I didn't feel as if I was taking to a sales guy trying to push something ). ( No I don't work for them, and sadly nor are they sending me free gear ).

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  • I can't connect to my network, except in safe mode

    - by eidylon
    My laptop cannot connect to my network all of a sudden except in safe mode. When it boots, it will show the networks available in the tray popup, but if I click connect on any, it says "Unable to connect" and the troubleshooter is useless. Shortly thereafter all the networks disappear. I have tried removing IPv6 support as I have seen that cause problems. No joy. I've also tried removing the wireless network adapter in Device Manager and reinstalling it, also no joy. I've also tried attaching a USB wireless adapter, and it has the same problem. If I boot in safe mode, then it has no problems at all. Three other devices in the house connect fine, so I am pretty sure it is nothing to do with the router. Any ideas what to check next? I am running Win7 Ultimate on a 2GHz Quadcore with 8GB RAM with a Broadcom 802.11n wireless card. EDIT: RE wired connections: What is very weird is that if i plug in a wired connection, then not only does it connect via the wired connection, but the wireLESS also starts working perfectly. And a soon as I unplug the wire, then the wireLESS stops working again! So it seems the wireless is right now working only in safe-mode, or when a wired connection is also plugged in.

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  • How does NMap decide to print a progress line?

    - by Andrew Bolster
    Checking a larger subnet than I normally do; mapping out a cluster suite in a university for a traffic mapping project (permission attained), and I was wondering something. NMap usually prints its progress periodically, but I'm unclear to what that 'periodically' is, because the cirrent scan printed a line for basically every 100th of a percent up to 1% done, then one at 1.5%, and has said nothing since. I suspect that it changes at different 'levels' but does anyone have an actual answer?

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  • PXE Boot not working

    - by Nishant
    Please explain the error in this screenshot DHCP Setting: This screenshot was taken after powering off the old comp hence he server interface is shown as the wireless card - it becomes 192.168.0.1 when I connect wires and power up the old laptop to boot via PXE. My scenario is simple. An old laptop and a new laptop . A cross over cable ( that I myself made from CAT 6 cable by cutting it and connecting 4 wires as mentioned in some doc). The new laptop ( tftp server ) has a Wirelss Card ( with which I am browsing and writing this ) . And the cable is connected between laptops . TFTP server ( new laptop details ) Windows IP Configuration Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Link-local IPv6 Address . . . . . : fe80::f511:3d4a:ca01:122e%16 IPv4 Address. . . . . . . . . . . : 192.168.0.1 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.0.2 Wireless LAN adapter Wireless Network Connection: Connection-specific DNS Suffix . : Achilles Link-local IPv6 Address . . . . . : fe80::99b1:8ae0:9e6c:f300%11 IPv4 Address. . . . . . . . . . . : 192.168.2.3 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.2.1

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  • Why should I use Firewall Zones and not just Address Objects?

    - by SRobertJames
    I appreciate Firewall Address Objects and Address Groups - they simplify management by letting me give a name to a group of addresses. But I don't understand what Firewall Zones (LAN, WAN, DMZ, etc.) do for me over Address Groups. I know all firewalls have them, so there must be a good reason. But what do I gain by stating a rule applies to all traffic from LAN Zone to WAN Zone which comes from LAN Address Group to WAN Address Group? Why not just mention the Address Groups?

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  • Access Home Network Server via External Address (DSL vs Cable)

    - by Dominic Barnes
    For the last few months, I've been using a server on my home network for basic backups and hosting some small websites. Up until this past week, I've been using Comcast (cable) as an ISP and now that I've moved into an apartment, I'm using AT&T. (DSL) I've set up dynamic DNS and I can verify it works externally. However, I can't seem to access the public address from within the local network. Is there something DSL does differently from Cable that makes this frustration possible?

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  • Planning home network

    - by gakhov
    I'm planning to setup my home network from scratch and want to ask professional opinions or tips. My home is connected to Internet with a cable connection (100 Mb/s). The devices I would like to connect are VoIP phone (RJ-45), TV (WiFi/LAN), 3 laptops (WiFi), 2 smartphones (WiFi), an iPad (WiFi), a Kindle (WiFi), a network printer and, probably, a home media storage (WiFi/LAN). As you can see, the most load will be on WiFi connections (probably, even if TV supports WiFi it's better to connect it by LAN?). So, I need help to choose the best router (or combination of routers) to support stable connections for all these devices and minimize the total number of routers/adapters. I like how Cisco/Linksys devices were working for me in the past, so preferably (but not obligatorily) I want to setup network with their solutions. Any thoughts?

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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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  • 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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  • 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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  • Shared firewall or multiple client specific firewalls?

    - by Tauren
    I'm trying to determine if I can use a single firewall for my entire network, including customer servers, or if each customer should have their own firewall. I've found that many hosting companies require each client with a cluster of servers to have their own firewall. If you need a web node and a database node, you also have to get a firewall, and pay another monthly fee for it. I have colo space with several KVM virtualization servers hosting VPS services to many different customers. Each KVM host is running a software iptables firewall that only allows specific ports to be accessed on each VPS. I can control which ports any given VPS has open, allowing a web VPS to be accessed from anywhere on ports 80 and 443, but blocking a database VPS completely to the outside and only allowing a certain other VPS to access it. The configuration works well for my current needs. Note that there is not a hardware firewall protecting the virtualization hosts in place at this time. However, the KVM hosts only have port 22 open, are running nothing except KVM and SSH, and even port 22 cannot be accessed except for inside the netblock. I'm looking at possibly rethinking my network now that I have a client who needs to transition from a single VPS onto two dedicated servers (one web and one DB). A different customer already has a single dedicated server that is not behind any firewall except iptables running on the system. Should I require that each dedicated server customer have their own dedicated firewall? Or can I utilize a single network-wide firewall for multiple customer clusters? I'm familiar with iptables, and am currently thinking I'll use it for any firewalls/routers that I need. But I don't necessarily want to use up 1U of space in my rack for each firewall, nor the power consumption each firewall server will take. So I'm considering a hardware firewall. Any suggestions on what is a good approach?

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  • Host spreads wrong MAC Adress of router on the WIFI

    - by JavaIsMyIsland
    Strange things are going on our network. Since yesterday a host which is actually not on our subnet spreads wrong ARP Replys on our network. To be precise, only on the WIFI. If I connect my Laptop to the cable ethernet, it gets the right MAC adress of the router. Also my Android phone and my Ubuntu system do get the right MAC Adress. So I took a look at wireshark. When I clear the ARP cache of the windows machine, the first ARP response is correct and comes from the router. But like 10 ms later another ARP response comes from another host in the WIFI. The host changes its IP Adresses from time to time and they look like they are not on our subnet. So I can not use the internet because DNS is not working anymore. Sometimes the router wins the race condition and the mac adress is set correctly in the arp cache. I first thought, this is an arp-poisoning mitm attack but it does not make sense if the packets get not routed correctly?! I restarted the router but it didn't help. I have no access to the router, else I would change the shared key to make sure there is no intruder on the wifi.

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  • Mixed network, Linux-to-Linux hostname resolution issues

    - by James
    At work we have an WinSBS domain at the heart of our network, which is all Windows PCs. The domain controller is acting as a DNS for these computers. I have recently added some personal use Linux machines to the network, without joining them to the domain. I have set up Samba with "wins server" pointing to the domain controller, which lets the Windows boxes resolve the Linux hostnames just fine. I also have resolvconf set up with the domain controller as a nameserver and the local domain as a searched domain, which lets the Linux boxes resolve the Windows hostnames just fine. However, the Linux boxes will not resolve other Linux hostnames at all. Given that I don't have control over the DNS server (I am not the network admin) and that at least one of the Linux boxes is not an always-on machine and is likely to change its LAN IP frequently (via DHCP), what service am I missing to make their hostnames visible to each other?

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  • Homegroup should be working, but doesn't

    - by Tim
    I have Win7 installed on both my PC and laptop. When I choose to make a homegroup I can go through the steps of creating, getting password, then joining it from the other computer and it says that it all connects properly. But when I go to the homegroup tab it always says no other computers connected. If I look in the settings it will say "connected to suchandsuch homegroup" but the comps won't show. Also, on my PC, when I tick the boxes in the homegroup settings on what libraries I want to share, then click on save settings, it shuts down the settings window and when I re-open it the library tick boxes are all unticked again. Yet, I have had no problems with the tick boxes stayin ticked on the laptop. I have tried cancelling and remaking the homegroup, have tried making it on both computers, and have tried disabling and re-enabling the network connectors but it still won't work. At my old house we had 3 PCs running win 7 and 2 of them could homegroup together fine but mine never could as it was getting the same problem I am getting now. I feel like I am the only one on the planet with this problem. Can anybody help?

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  • Wifi connected but no data transfer

    - by Anuj
    I have a Desktop which runs on Windows XP and a laptop which runs in Ubuntu. Recently I have set up a wireless router in order to be able to access internet on my laptop through wifi. The laptop connects to the wifi at ease, but is unable to transfer any data. Only when I switch on my laptop for the first time, it is able to transfer some data only for around 2 mins, after which it shows Destination Host unreachable on pinging the router, and everything stops working, but the wifi still shows to be connected. Please help!

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  • Pros/cons to turning off cable modem

    - by Jay
    A little off the wall perhaps, but ... I have a cable modem and a router for a wireless home network. Is it a good or a bad idea to turn it off at night and during the day when we're all at work or school? Or should I leave it on 24/7. I was thinking that leaving it on constantly makes me more vulnerable to hackers, not to mention wasting electricity. (Though I'd guess the amount of electricity used by a cable modem and a router is probably pretty trivial. Still, every little bit helps.) When I have turned it off and turned it on again, it takes several minutes for it to go through its little dialog with the cable company and get me connected to the Internet again, which is annoying but not a big deal. Anyone know any good reasons one way or the other?

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  • Trouble with wireless driver on a Dell Latitude D830

    - by Kevin
    After uninstalling Dell's wireless utility I get a new hardware found dialog that can not find any driver for my wifi card on it's own. I'm running Windows XP Professional Service Pack 3, and I would like to use the default wifi handler since dell's utility does not work with my company's wireless switch. I did try downloading the recommend driver from the dell support site Network Adapter 2 Model Intel(R) PRO/Wireless 3945ABG Network Connection Description [12] Intel(R) PRO/Wireless 3945ABG Network Connection Status Connected

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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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  • Unable to connect to cable modem when connected to VPN

    - by Spuas
    the scenario is as follows: First I have a cable modem which gives the internet connection. The network is 192.168.0.0/24 and its IP is 192.168.0.1 Second line, I have a router connected to the cable modem. Its "outside" IP is 192.168.0.12. This router creates network 192.168.123.0/24 and its IP there is 192.168.123.254. My computer is wired to the router with IP 192.168.123.126. At this point I am able to access both devices web interfaces by their IPs on a browser (192.168.123.254 for the router and 192.168.0.1 for the cable modem). The problem I have is when I connect to a VPN from the computer. Then I am connected to a second network 10.0.0.0/24 and I get IP 10.0.0.200 (along with 192.168.123.126). I can connect to the router but then I loose connectivity to the cable modem: I cannot acces it through the browser, neither making a ping to it or a tracert. I have tried to add a new route to the windows routes by typing route ADD 192.168.0.1 MASK 255.255.255.0 192.168.123.254 but I cannot access it anyway... Am I missing something on the route adding? Which is the propper way of doing this? Thanks

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  • Why do I often have to refresh pages I navigate to once for them (or content in them) to load?

    - by GetOutOfBox
    I have noticed a bizarre pattern when using my PC, that when I open a link to a website, it often will often take a very long time to load, or time out. Sometimes content on the website will be drawn, but again, it seems to get "stuck" for an unusual amount of time before finishing. Most affected is Youtube; almost every time I navigate to a youtube video from another website such as Google, the video will not begin playing, but will instead just display the player controls with a black screen where the video should be and the buffering symbol, usually before displaying an error such as "The video failed to load". The unusual part of this problem is that whenever this happens, refreshing the page always causes it to load almost immediately the second time around, without any problems. Note that I'm not talking about how some browsers will dump whatever has been cached to the "pallet" briefly when the page is refreshed or loading stopped; but that the second time loading the website being faster. I have done my best to rule out some of the obvious causes: My Windows 7 desktop computer is the only device that seems to be affected. I use Firefox on it (latest version, flash updated, etc). My connection has more than enough bandwidth (30 megabits down, 4 up), and I've even tried QoSing all other devices to make sure this isn't happening due to usage spikes. Wireshark is not showing any clearly unusual network activity (i.e frequently dropped packets).

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