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• Colocation and HSRP setup

  - by WinkyWolly

  My colocation provider has setup HSRP for us and has provided us 2 drops (plugged into 1/1/1 and 1/1/2) from their routers as well as a /29 with 2 HSRP IP's and the rest of the /29 usable for the switch. I know that HSRP should be pretty much plug and play as long as the ports are in the same VLAN. However I'm confused as to how to the IP setup should work. Currently I've assigned port 1/1/1 the full /29 however I think this is incorrect because if I were to unplug it port 1/1/2 wouldn't work as it has no IP assignment. What's the proper way to do this?

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• Net send question

  - by somacore

  I'm on a work laptop. If I do a 'net send' to all computers on the domain while not VPN'd into the network, and it says it's successful, one of the following is true: It failed, but thinks it's successful, and it won't send anything. It failed, but it will send next time it's on the work domain. I know I was off the domain when I sent it (I made sure of that first). What will happen?

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• Does ICS modify windows firewall policies in the registry?

  - by insipid

  I had a host machine I wanted to enable ICS on. First I realized that doing so was not possible until I enabled the Windows Firewall. Once I enabled the firewall and set up ICS, I noticed due to group policy I could no longer disable the firewall. Also, any ports I tried to open seemed to be ignored. Although nothing seemed to be configured when I used the mmc snap-in to view local computer policy, when I checked the registry I noticed several policies set there in HKLM (such as disabling AllowLocalPolicyMerge). I was able to remove the policies from the registry and my open ports worked, but they were eventually re-added without my input. The network I am sharing the internet from is an "unsecured" wireless network with an authentication page, is it possible that this is causing those policies to be set? Did ICS set those policies? When you go to the properties of the ICS enabled adapter and go to the ICS settings it takes you to a tab called services where you can add and remove "services running on your network that internet users can access". Is this related to the windows firewall?

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• Hooking up a multifunction printer via network and USB

  - by C-dizzle

  I have a Dell 2155CDN Multifunction printer that is hooked up through our network. But when using the scan feature, it is terribly slow, and I assume it has something to do with it scanning through the network port. Is it possible to leave the printer hooked up across the network, but also attach it to a computer via USB just for the scanner? Or would doing this confuse the printer not knowing which port to use for each feature?

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• netkit: why cant my router 4 pc4 ping my router 1 pc1 - how can I solve this please?

  - by donok

  Below I have four routers connected but my pc1 on r1 cannot ping my pc4 on r4 and also my pc2 on r2 cant ping my pc4 on r4 and vice versa. Below is a network diagram: and the configurations are below that, could anyone help me please on making them accessible? ![connecting 4 routers][1] I cant post my diagram on serverfault(less than 10 rep) so I did on stackoverflow and asked the same question. pc1: ifconfig eth0 195.11.14.5 netmask 255.255.255.0 broadcast 195.11.14.255 up route add default gw 195.11.14.1 dev eth0 pc2.start: ifconfig eth0 200.1.1.7 netmask 255.255.255.0 broadcast 200.1.1.255 up route add default gw 200.1.1.1 dev eth0 pc3: ifconfig eth0 195.20.14.9 netmask 255.255.255.0 broadcast 195.20.1.255 up route add default gw 195.20.14.1 dev eth0 pc4: ifconfig eth0 200.2.1.11 netmask 255.255.255.0 broadcast 200.2.1.255 up route add default gw 200.2.1.1 dev eth0 r1: ifconfig eth0 195.11.14.1 netmask 255.255.255.0 broadcast 195.11.14.255 up ifconfig eth1 100.0.0.9 netmask 255.255.255.252 broadcast 100.0.0.11 up route add -net 200.1.1.0 netmask 255.255.255.0 gw 100.0.0.10 dev eth1 route add default gw 100.0.0.10 lab.conf: if you need more on that Ill post it up but I think most of the info is there. Any help would be greatly appreciated especially trying to make a connection between pc4 and pc1, even if you think it does not make sense please explain why. Thank you.

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• Capabilities of business and SOHO routers

  - by Q8Y

  I'm currently studying for the CCNA certifications (especially for Cisco routers and configuration). I know that business routers provide more features than SOHO routers, the processing speed and RAM can be enough. Assume I need to connect a number of users through a network (accessing internet, share files, printers, ...). I have a high speed connection to the internet and I already applied QoS. How can I find out how many users such a single (SOHO) router could handle? In my case I'd attach to it multiple switches until I have the number of ports needed. Would everything work well and smoothly with 50 users? What about 300? At which point would I need a business router instead? If I implemented VLAN here, would it make any difference in the performance? When do I really need to use more than one router? (Both SOHO and business) I'm thinking that I may need them only if I want to increase the performance (instead of replacing the existing one) and if I have multiple locations, so in this situation I need to have multiple routers, right? Put differently: Is there is a need to have another router if my business all in one place?

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• Switch to IPv6 and get rid of NAT? Are you kidding?

  - by Ernie

  So our ISP has set up IPv6 recently, and I've been studying what the transition should entail before jumping into the fray. I've noticed three very important issues: Our office NAT router (an old Linksys BEFSR41) does not support IPv6. Nor does any newer router, AFAICT. The book I'm reading about IPv6 tells me that it makes NAT "unnecessary" anyway. If we're supposed to just get rid of this router and plug everything directly to the Internet, I start to panic. There's no way in hell I'll put our billing database (With lots of credit card information!) on the internet for everyone to see. Even if I were to propose setting up Windows' firewall on it to allow only 6 addresses to have any access to it at all, I still break out in a cold sweat. I don't trust Windows, Windows' firewall, or the network at large enough to even be remotely comfortable with that. There's a few old hardware devices (ie, printers) that have absolutely no IPv6 capability at all. And likely a laundry list of security issues that date back to around 1998. And likely no way to actually patch them in any way. And no funding for new printers. I hear that IPv6 and IPSEC are supposed to make all this secure somehow, but without physically separated networks that make these devices invisible to the Internet, I really can't see how. I can likewise really see how any defences I create will be overrun in short order. I've been running servers on the Internet for years now and I'm quite familiar with the sort of things necessary to secure those, but putting something Private on the network like our billing database has always been completely out of the question. What should I be replacing NAT with, if we don't have physically separate networks?

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• Create account for service

  - by Andy

  I am configuring a new server. The server is running Hudson that is going to copy some files from this server to another. The other server is a virtual machine. Both running Windows Server 2012. Hudson is started on server A with log on as "Local System". When I come to the copy phase it says "Access denied". Changing the log on to "Administrator" works. However, I guess this is bad. I do not have much experience with user management. I tried to create a own hudson account on both servers A and B. I tried to log on as hudson account in the service-management but it doesn't start. How would you create an account for this particular service that has access to the shared folder on server B and can be used to start the service on server A? I guess I need two accounts with same username and password on server A and server B? The folder on Server B is shared with everyone and the guest account is enabled.

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• How to access an node of an LAN via WAN?

  - by gilzero

  Lets say I have a router that is connected to the Internet. An WAN IP address is given by ISP. It is using PPPoE ADSL, the IP address is not static, every time it connected, assigned a different IP address. There is an web server 192.168.0.100 running in the LAN. I heard something like DMZ + DynDNS can do the job? But not sure what these are and how they work. Any there way(s) to access the local node 192.168.0.100 via WAN, so that I can reach that node even I am not home. Thanks for any advice.

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• Laptop loses signal from WiFi router, but mobile phone holds it fine

  - by Anton

  I have an extremely weird issue with my WiFi router. Both Ubuntu & Windows 7 can connect to it fine, but after 5-10 minutes browser (any one) stops opening pages and tells me it cannot resolve host address. But, at the same time, tools like Skype or BitTorrent work without any issues. I can also browse Internet on my mobile phone connected to the very same router. If I reset router it helps, but after 5-10 minutes I see just the same problem... Ubuntu tells me that WiFi signal is lost (mobile sees it), Windows 7 just won't let me browse anywhere. Can anyone give me a suggestion on this, please? Thanks

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• Why would http & https be blocked, even in safe mode with firewall disabled?

  - by Cogwheel

  I have a windows 7 machine (dell studio xps). Everything on it seems to be in working order. The network device says it has internet connectivity, and indeed I can ping websites, transfer files via ftp, connect to vpns and remote desktop, but the web won't work. I've disabled the windows firewall and still no go. There are no other firewalls installed. The computer came with a trial of norton 360 so I also used the norton removal tool (which solved a similar problem on another computer for me previously). Any thoughts?

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• How to determine what program send the packet recorded in Wireshark?

  - by Tono Nam

  I was taking some tutorials on Wireshark in order to analyze the packets sent and received when talking to a web server for purposes of learning. When I start listening/recording packets in Wireshark, there where so many packages being recorded (700 packages per minute). Is it normal to have that much traffic if I have all the programs that will cause traffic such as all browsers, log me in, dropbox, goto meeting, etc., closed? In order to try to solve the problem I am analyzing random packets. Take for instance this filter: I just selected a random IP: 74.125.130.99. So how can I know from what program those packets where created? Also how can I get more info about that communication bwtween my computer (192.168.0.139) and that server (74.125.130.99)? I just selected a random IP from the Wireshark capture. There are also other IPs that I have no idea why they are communicating with my computer. How can I figure that out?

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• Creating a network link between 2 very close buildings

  - by Daniel Johnson

  I have a charity who have two adjacent medium sized modern detached houses (in the UK): the buildings stand next to each other and are less than 5 metres apart. They have DSL connected to a single computer in one of the buildings. They want to add a network with wireless, and want it to work across both buildings. Being a charity they need to keep costs down. The network would be used for sharing Word documents, e-mail, browsing and skyping. My initial thoughts were to connect the buildings with fibre. So: Option 1 Use fibre between the buildings. Sufficient cable and two TP-LINK MC100CM Fast Ethernet Media Converters. Cost ~£80.00. But there is the extra cost and hassle of running the cable down and up the external walls, lifting and relaying paving, and burying underground. Never having fitted fibre I'm also a little worried about going up the wall and then bending the cable at 90 degrees to go through the wall and into the building. Option 2 Use two TP-Link TL-WA7510N High Powered Outdoor 5Ghz 15dBi Wireless antennas to connect the buildings. There is a clear line of sight at first floor level. Cost ~£100. And much easier to fit than fibre! Is using the TL-WA7510Ns overkill? Is there something more suitable? I had hoped to use some Netgear stuff, e.g. two DGN2200, one in each house and also use them to provide the wireless link between the buildings. However, in bridge mode wireless client association is not available and repeater mode with client association only supports WEP security which isn't strong enough. Is there something similar that would be up to the job? Option 3 Connect the buildings with UTP cable. My concerns here are risk of electric shock due to a difference of potential between the buildings (or are they so close this shouldn't be an issue) and protection from lightning strikes. Is fitting lighting arrestors expensive? And what can be done to ameliorate against the risk of shock? This all falls outside my area of expertise so I would really appreciate some advice.

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• Stress test a server for simultaneous connection

  - by weston smith

  I am trying to figure out a practical way to stress test a server for 300 to 600 simultaneous connections. Any advice? Thank you everyone for the help. To be more specific (sorry I wasn't before) this is a Flash Media Server on AWS that will be streaming live video. I've been having problems with the video freezing/buffering for everyone and I need to verify if its on the user end, upload end, or server end. I mainly need help with stress testing the server with 300-600 multiple request before going live.

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• Different Ip adress range from provider

  - by victor

  I have different ip-range on the network, the dhcp is from the bordaband that says it uses different iprange as balancednetwork. however this causes issue as my nas and other computer gets the otner iprange of 84 and some computer gets iprange start at 94.254. i have use netgear switches gs108v2 but still get the issue with different ip adress. would apriciate answer on how i can get all devies on the same ip-range thanks

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• connection lost on computer lock

  - by unknown (google)

  hi i just formated my pc and installed WinXP sp3. now when i lock my comp. (Windows + L) or (ctrl + alt + del) it loses connection (LAN). is there any registry hack or something else because it didn't do this before formating?

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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 configure Amazon Security Groups to achieve multi-tier architecture?

  - by ks78

  What is the preferred way to configure Amazon Security Groups to achieve a multi-tier architecture? Each of my instances has its own Security Group, which I only want to use for rules specific to an instance. I'd like to keep any rules which apply to multiple instances in a separate Security Group, which can then be assigned to instance Security Groups as necessary. As an example, I've setup a group called "admin", which allows administrative access from my IP. I added the "admin" group as the source to each of my instance security groups. However, I still can't access the instances from my IP without adding the rules directly to the instance's group. Am I missing something? Although it seems a multi-tier security architecture should be possible, it doesn't seem to be working.

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• Why can't my networks reach each other?

  - by HOLOGRAPHICpizza

  We have two Buffalo WZR-HP-G300NH2 routers, with the default firmware, DD-WRT v24SP2-MULTI (10/31/11) std - build 17798. Each has a separate cable internet connection with a public static IP address. They are both in the 24.123.68.0/24 space. Both of them can contact pretty much the whole internet, and they can both be accessed out on the internet with no problem, but for some reason they can't talk to each other! When I try to ping one from the other I always get "Destination Host Unreachable". There are no strange routing or firewall rules in place. And they are both set to respond to pings, I can ping them from outside. Our main IT guy is going to call our ISP on Monday, but I'm impatient, so does anyone have any ideas?

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• How to connect 2 routers (Asmax and D-link)

  - by piobyz

  I just bought a new router, D-link DSL 2641B and want to connect it to another one, provided by my ISP, Asmax AR 804MP. Previously, I had Linksys WRT350N, and there was no problem, while I had Ethernet cable plugged in to one of LAN ports in Asmax and INTERNET(RJ45) port in Linksys, connection used PPPoE protocol -- worked OK. D-link has DSL(RJ11) port (which I don't want to use as Asmax replacement, while there is a separate Ethernet cable with a TV plugged to Asmax, which I don't want to configure from scratch on D-link). How should I connect my new D-link to work with Asmax? Via DSL port? Via one of the LAN ports (in which case I probably should change the purpose of this port in the config, I guess?). I tried connecting D-link both ways: LAN(ASMAX) to LAN(DLINK) LAN(ASMAX) to DSL(DLINK) (using RJ11 - RJ45 cable) I hope there is some setting in the DLINK's config that I overlooked. I haven't tried to see what's in ASMAX's config, but I guess I don't need to change anything there, while Linksys worked just fine? The only difference I see, is that D-link has RJ11 DSL port as WAN, and Linksys has RJ45 (called by them INTERNET) as a main WAN port.

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• setup PXE (i.e. DHCP + TFTP) server on MacOSX

  - by Albert

  What is the easiest way to setup an PXE server (i.e. a DHCP server + TFTP server) on MacOSX? Is there maybe some easy-to-use tool which just comes with both servers builtin? I have done that in the past but I remember that it took me several hours of editing some config files of tftpd (I think) and different versions of dhcpd, many trials and errors until I got it working (mostly). Now I have a fresh MacOSX installation and I want to avoid any complicated setup.

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• Tool to indicate type of network connection

  - by ggonsalv

  I know of whoami.exe. Is there a version called whereami.exe The output should be able to tell me if I am on a LAN, wireless or VPN. the machines would be running Windows Xp or better.

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• how to install Wimax Dongle over Ubuntu?

  - by Mosh

  i have Asus Wimax Dongle and it has an Independence software from the Asus company requires user name and password and its running will over windows 7 now i've tried ubuntu 10.10 but nothing happens when i plug the dongle into usb. in windows if you plugs it for the first time, an application wizard begins and you can find a virtual cd in my computer but i cant find it in Ubuntu now i would install it over ubuntu, how? toast for all

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• Netgear router is not resolving hostnames

  - by Thomas Clayson

  Not sure what the problem is, but I am used to being able to access other clients on my LAN via their hostname. We got a new router from plusnet (Netgear WNR1000v3) and now this has stopped working. For instance, if I were to run a web server from one computer with the hostname TomPC usually I could go into a browser and type http://TomPC and I would get the web server front page. I can access it by using the LAN ip of the machine. e.g. http://192.168.1.1 works fine. I thought it would be a simple option in the admin panel of the router - possibly I had to turn on DNS/DCHP or something. But I can't see anything, and my searches on the internet seem to turn up ridiculous solutions involving setting up a dedicated DNS server on my LAN. This is just a small home network - really I just want to be able to access my Raspberry PI on the network without having to work out the IP address every time. (I know I could just set a static IP address for it, but using its hostname would be much easier). DCHP is enabled in the LAN settings part, although RIP is disabled (I don't know what the latter is) I don't know if this has anything to do with it? Many thanks!

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• Win 2003 STD network adapter always showing DHCP when in static IP configuration, + it loses the DNS

  - by Darragh

  Hi, I have a server that after the first configuration it was DHCP, now I have added it to our domain and in a static IP, however after a few moments it returns to DHCP but with only some of the IPv4 setting staying the same, It loses DNS for example. I'm not sure what is causing the problem but all I know is this started to happen after I added it to the domain, Would it be a domain policy? or the NIC drivers Spec; Dell M605 Blade server Windows 2003 STD SP1 Intel Xeon Quad core NIC: Dual embedded Broadcom NetXtreme IITM 5708 Gigabit Ethernet NIC w/ TOE

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