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  • Anyone interested in obtaining a cable list from a visio Diagram? [closed]

    - by Alex
    it's my first post here. Just wondering if anyone had to deal with the following problem - you have to install over say a 100 network elements and servers - cabling is done via contractors, so you need to provide them with an accurate, error-free cable list - your inputs are a set of detailed, port by port, visio diagrams. Prb is to obtain the cable list and get the cabling started while you're busy crafting the switch/routers configs. I coded a Visio plugin, which I plan to release under the GNU license, that returns a cable list from a diagram, and tested it on intermediate size infrastructure, 2K+ cables. It works well. The tool needs a little work to be user friendly, so before getting started, I wanted to know if that was worth the effort. Questions are welcomed, let me know -A PS: the tool is targeted for those who need a port by port description of their network, in the form Source/slot/port/Destination/slot/port.

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  • Virtual Machine Network Architecture, Isolating Public and Private Networks

    - by Mark
    I'm looking for some insight into best practices for network traffic isolation within a virtual environment, specifically under VMWARE ESXi. Currently I have (in testing) 1 hardware server running ESXi but i expect to expand this to multiple pieces of hardware. The current setup is as follows: 1 pfsense VM, this VM accepts all outside (WAN/internet) traffic and performs firewall/port forwarding/NAT functionality. I have multiple public IP addresses sent to the this VM that are used for access to individual servers (via per incoming IP port forwarding rules). This VM is attached to the private (virtual) network that all other VMs are on. It also manages a VPN link into the private network with some access restrictions. This isn't the perimeter firewall but rather the firewall for this virtual pool only. I have 3 VMs that communicate with each other, as well as have some public access requirements: 1 LAMP server running an eCommerce site, public internet accessible 1 accounting server, access via windows server 2008 RDS services for remote access by users 1 inventory/warehouse management server, VPN to client terminals in warehouses These servers constantly talk with each other for data synchronization. Currently all the servers are on the same subnet/virtual network and connected to the internet through the pfsense VM. The pfsense firewall uses port forwarding and NAT to allow outside access to the servers for services and for server access to the internet. My main question is this: Is there a security benefit to adding a second virtual network adapter to each server and controlling traffic such that all server to server communication is on one separate virtual network, while any access to the outside world is routed through the other network adapter, through the firewall, and on the the internet. This is the type of architecture i would use if these were all physical servers, but i'm unsure if the networks being virtual changes the way i should approach locking down this system. Thank you for any thoughts or direction to any appropriate literature.

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  • Setting up dual NICs under Server 2008

    - by Randall Sexton
    Hi, I'm trying to determine how to set up dual NICs on my Server 2008 box (not R2). I want all web traffic on one NIC and all Hyper-V traffic on the other. Is this possible? ( I assume that it is ) How is this done? ( A link to a tutorial you know of would be great ) Both NICs are the same (Intel PRO/1000 EB Network Connection with I/O Acceleration). Thanks in advance, Randall

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  • 4 - 7 second delay accessing Mysql across the network

    - by Kristiaan
    Hello, our company has recently purchased a new server with the intention of replacing our aging database server. its a full 64bit 2008 enterprise system, i have got the basic server setup and configured and then installed the 64bit version of mysql on the server, this has then been configured to match where possible our existing server as much as it can. however i have noticed that when it was swapped with the production database server our software systems had an increased delay accessing the mysql database this was anything beween 4 - 7 seconds. i have tried disabling TOE, IPv6 and a few other suggested soultions to this but so far cannot find out where this slowdown is coming from. replacing the server with the production one and the delay goes away. in terms of software and hardware the servers are not very identical at all due to one being windows 2003 std with a 32bit server and the new one being windows 2008 enterprise with a 64bit server. thanks Kris

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  • What does this TCP Packet mean ?

    - by asksuperuser
    I'm total newbie at tcp/ip and I was experimenting with Wireshark. What this mean: 1824 578.194204 xxx.xxx.xxx.xxx yyy.yyy.yyy.yyy UDP Source port: 17500 Destination port: 17500 In data I can see that my user pc name is sent (happily it's a generic name): does this mean someone is trying to hack my pc ?

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  • Fortigate 200A firewall CPU high resource usage

    - by user119720
    This morning I'm receiving complaints from several end users that saying their whole department network are slow and have intermittent. Therefore I've checked our firewall to see whether if something goes wrong with the device.From my observation in the FortiGate dashboard status, the CPU resources is very high (99 percent). My first assumption is to clear the log since in the alert log the Fortigate log mention that it is already 90% full.Based on my understanding,the log can be cleared by restarting the firewall. After restarting the firewall the network seems okay again but then after several minutes it went up again.The condition still persist until now. Can someone show me where else I can check to fix this issue? I've really appreciate any help that I can get here.Thanks. Edit: diag sys top command

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  • Private staff network within public network

    - by pianohacker
    I'm the sysadmin at a small public library. Since I got here a few years ago, I've been trying to set up the network in a secure and simple way. Security is a little tricky; the staff and patron networks need to be separated, for security reasons. Even if I further isolated the public wireless, I'd still rather not trust the security of our public computers. However, the two networks also need to communicate; even if I set up enough VMs so they didn't share any servers, they need to use the same two printers at the very least. Currently, I'm solving this with some jerry-rigged commodity equipment. The patron network, linked together by switches, has a Windows server connected to it for DNS and DHCP and a DSL modem for a gateway. Also on the patron network is the WAN side of a Linksys router. This router is the "top" of the staff network, and has the same Windows server connected on a different port, providing DNS and DHCP, and another, faster DSL modem (separate connections are very useful, especially as we heavily depend on some cloud-hosted software). tl;dr: We have a public network, and a NATed staff network within it. My question is; is this really the best way to do this? The right equipment would likely make my job easier, but anything with more than four ports and even rudimentary management quickly becomes a heavy hit on our budget. (My original question was about an ungodly frustrating DHCP routing issue, but I thought I'd ask whether my network was broken rather than asking about the DHCP problem and being told my network was broken.)

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  • How do I force specific permissions for new files/folders on Linux file server?

    - by humble_coder
    I'm having an issue with my install of Ubuntu 9.10 (file server) and its samba permissions. Logging in and reading works fine. However, creation of new directories by users restricts access for other users. For instance, if Bob (Windows user who maps the drive) creates a folder in the directory, Jane (Mac user that simply smb mounts) can read from it, but can't write to it -- and vice versa. I then must go CHMOD 777 the directory for everyone to be happy. I've tried editing the "create/directory mask", and "force" options in the smb.conf file but this doesn't seem to help. I'm about to resort to CRONTABing a recursive chmod routine, although I'm sure this isn't the fix. How do I get all new items to always be 777? Does anyone have any suggestions to fix this ever-occurring situation? Best

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  • Mikrotik server networks and Cain & Abel

    - by user269742
    I'm connected to the internet via a mikrotik server network. Recently, I read about that scaring application named Cain & Abel and all the capabilities it offered for malicious users. I don't know if anyone on my network is using or even aware of such application but my questions are: 1- How to protect myself from this program? 2- How to know if someone using such application against me? 3- Is Tor Bundle capable of protecting me from Cain & Abel? 4- If I filled my e-mail password via SSL page, Can Cain & Abel collect it? 5- Is it safe to use SKYPE or Yahoo Messenger voice chat if some one using Cain & Abel on my network?

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  • Sendind an internet radio singal from my hifi to a portable

    - by Paul
    I'm just about to set myself up with a wireless network in my house. This is so that I can intregate an internet radio into my hifi system. What I would love to do is to listen to the radio in another room of the house. I also have a little portable radio/cd player that has a USB port on the front. Is there something I could buy which would allow me to listen to the radio through my portable in another room? I do realize that I could solve this problem by buying some wireless portable speakers, however I just wondered if anybody knew another way i.e. bluetooth or something similar?

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  • Printing on Windows 8 with PDF viewer (Adobe Reader) from network

    - by Bongo
    i have a problem with the Adobe Reader 8, but the problem seems to be equally bad with other pdf viewers. Here is the configuration: My PDF viewer is located on network drive "Z:" which is the network adress \dgs-main\progs. I tried to start the adobe reader from here - \\dgs-main\progs\Adobe\Reader 8.0\Reader\AcroRd32.exe and open the PDF from here - C:\Users\ServiceDesk\AppData\Local\Temp\GeneratedPDF.pdf The problem is as follows, if i open the PDF with a local PDF viewer everything works fine and i can print the document. If i open the PDF with the Network PDF viewer then it opens, but printing is impossible. The error message states: "Unable to start print job. Is printer available?" As mentioned above, it works with a local pdf viewer. In both cases i use the same printer. The Printer is a network printer but even with a local printer it fails. The error occurs only on Windows 8 machines. On windows 7 it works fine. I Hope somebody can tell me what the problem is. Thanks in advance and have a fine day.

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  • How do I load balance between two Linux machines?

    - by William Hilsum
    Inspired by the Stack Overflow network, I am now obsessed with HAProxy and trying to use it myself. At the moment, each HAProxy box has got two network cards (well, two configured, I can have a maximum of 4 and wasn't sure if they needed their own one for management between the boxes). On both machines, the backend one (eth1) is a private IP that goes to a switch connected to the webservers, and the front facing one (eth0) has a public internet IP that is routed straight though. In addition, I have created an additional virtual ip for eth0 called eth0:0 which has got a third public ip address. I just about get how to use it for load balancing between multiple web servers that are behind it, but, I am failing to load balance between the two HAProxy boxes - they appear to fight for the virtual IP, but, this does not appear to be a smart solution. Now, by using the virtual shared IP address, this solution appears to work and does seem to give me maximum uptime, but, is this the correct way to do it, or is there a smarter way? I have been looking at other Linux packages such as keepalived, but, I have only been using Linux (server) for a week now and am at the limits of my understanding. Is there anyone who has done this before and can you advise anything for maximum uptime?

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  • Gigabit capacity

    - by abronte
    Do gigabit ports have a total throughput of 1 gigabit so that you could be sending 800 mbit and receiving 200 mbit at the same time. Or is it 1000 in and 1000 out?

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  • Facebook doesn't work on computer, but work on mobile device, both use the same router

    - by sasa
    I have a very strange problem and I'm thinking that can be problem with dns or something similar, but not sure and don't know how to solve. My computer is connected to router and every site works fine except facebook (Chrome and Firefox). Chrome shows "Error 101 (net::ERR_CONNECTION_RESET): The connection was reset." But, on mobile device witch is connected to the same router facebook works fine (Fb application and Delphin browser). Pinging facebook works fine. Clearing cookies and cache didn't help. Also, I performed antivirus and antimalware scan and there is nothing. What can be a problem? Update: I'm also connect notebook on that wifi router, and on it works fine. nslookup facebook.com Server: UnKnown Address: 192.168.1.1 Non-authoritative answer: Name: facebook.com Addresses: 2a03:2880:2110:3f01:face:b00c:: 2a03:2880:10:1f02:face:b00c:0:25 2a03:2880:10:8f01:face:b00c:0:25 69.171.224.37 69.171.229.11 69.171.242.11 66.220.149.11 66.220.158.11

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  • How to connect cable internet on ubuntu

    - by NAVEED
    I was using my cable internet on windows and it was working. Now I moved to ubuntu for development work. But I am unable to connect this internet on ubuntu. I called their technical support and they ask me to install PTPPN (I have forgot the exact name) and then provide our server name, your username and passowrd. I download that software PTPPN(whatever) by using a debian file but I did not find it after installation. I tried to contact to technical support again but unable to connect. Can someone please tell the exact name of that software and how to install and then connect to internet on ubuntu? I have only the following information for now: Install "PTPN" on ubuntu. (forgot exact name of this package) servername: blue.connect.net.pk username: myusername password: mypassword Thanks

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  • Ninety-Fifth Percentile Calculation for Bandwidth

    - by Kyle Brandt
    I am trying to calculate the bandwidth of my current internet connection. I am pulling the current input and output transfer rate via snmp. If the argument to the following function is a sorted ascending list of the the some of each input and output sample, is this the right way to calculate 95th percentile? sub ninetyFifth { #Expects Sorted Data my $ninetyFifthLine = (@_ * .95) - 1; return $_[$ninetyFifthLine]; }

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  • Can't connect to domain computers until reboot

    - by thealliedhacker
    I have a domain with about 300 Windows 7 and XP machines, with the domain controllers running Server 2003. Sometimes, I lose the ability to communicate/authenticate with some of the machines until I reboot my computer. This also happens from other computers and regardless of user account and operating system. In other words, say I'm on ComputerA, and I can't connect to ComputerX. I can go to ComputerB and connect to ComputerX, but ComputerB may not be able to connect to ComputerY. If you reboot ComputerA, then it will be able to connect to ComputerX again. Here are some messages from various utilities: sc: [SC] OpenSCManager FAILED 1722: The RPC server is unavailable. mmc (compmgmt.msc): Computer (computer name) cannot be managed. The network path was not found. explorer (\\computer): Windows cannot access \\(computer name). ping: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss) / Average = 1ms

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  • Why would my wireless cut in and out every minute or so?

    - by Strilanc
    I've been having problems with my wireless. I moved to a new apartment, and the wireless seems incredibly unreliable. Sometimes it will be stable for hours until, all of a sudden, it starts cutting in and out. I'll get 30-90 seconds of normal behavior, then 5-30 seconds of nothing, then repeat. Sometimes the connection will stop working entirely, until I power-cycle the router. It is extremely, extremely annoying. Surfing the web isn't too bad, assuming you can stand the random 5-30 second waits. But some connections are sensitive enough to timeout, and it certainly makes multiplayer games unplayable. Facts: I confirmed the problem using ping google.com -t. I get normal traffic, interspersed with bursts of "Request timed out.". I've never had this problem before with this laptop. I didn't bring my own router or modem to the apartment. I'm using what the old tenant had. Hooking directly to the modem via an ethernet cable results in a stable connection. Temporarily cutting power to the router sometimes fixes the problem. Sometimes it doesn't. I reset the router, but the problem remained. Apparently the previous tenant had issues with the internet, but I don't know what they were specifically. The router is a D-Link DIR-615, and their tech support is useless.

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  • Adding a Printer to my Print Server Failing

    - by Rudi Kershaw
    So, on the Windows Server page I read the following. Step 4: Add Network Printers Automatically Print Management (Printmanagement.msc) can automatically detect all the printers that are located on the same subnet as the computer on which you are running Print Management, install the appropriate printer drivers, set up the queues, and share the printers. To automatically add network printers to a printer server Open the Administrative Tools folder, and then double-click Print Management. In the Printer Management tree, right-click the appropriate server, and then click Add Printer. On the Printer Installation page of the Network Printer Installation Wizard, click Search the network for printers, and then click Next. If prompted, specify which driver to install for the printer. So, I have got to this point, made sure the printer (Canon MP620) is on and correctly plugged into the network. However, when I click "Search the network for printers", the wizard doesn't find it. Now, I can't get any further. Is there anything I could be doing wrong? How should I proceed moving forwards?

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  • Routing RFC1918 addresses through dd-wrt via a switch

    - by espenfjo
    I am a bit stuck with an experiment of mine. I have a network looking somewhat like this. | Internet | | ---- |Switch| ---- | | Server w/pub IP | DD-WRT router 192.168.1.1 | | RFC1918 clients 192.168.1.0/24 What I want is for the RFC1918 clients to speak directly with each others. On the server with the public IP I have this route: 192.168.1.0/24 dev eth0 scope link and can see that packets are infact reaching the dd-wrt router for 192.168.1.1, even though if I get no answer. Trying to reach one of the RFC1918 clients from the public IP server will get no result, as the dd-wrt router is not announcing that network on to its external interface (arp who-has 192.168.1.107 tell xxx.xxx.xxx.xxx, but no answer). The router being an WLAN dd-wrt router has of course a load of routes, VLANs and interfaces: xxx.xxx.xxx.1 dev vlan2 scope link 192.168.1.0/24 dev br0 proto kernel scope link src 192.168.1.1 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.244 84.215.64.0/18 dev vlan2 proto kernel scope link src xxx.xxx.xxx.xxx 169.254.0.0/16 dev br0 proto kernel scope link src 169.254.255.1 127.0.0.0/8 dev lo scope link 0.0.0.0 via xxx.xxx.xxx.1 dev vlan2 xxx.xxx.xxx.xxx being the public IP, and xxx.xxx.xxx.1 being the default route for the public IP. I am not sure where to continue with this. I would recon that I both need routing on the dd-wrt router, as well as some iptables magic? Why do something this complex? Why not ;) Also, do not mind that "Internet" can get RFC1918 traffic, it wont go outside of the walls. EDIT 1: Following the tip from stew I do indeed get the correct ARP flowing. And adding an iptables rule for allowing traffic from that specific public IPd machine I get traffic between the systems! Oddly enough though, the speed I get from Server w/pub IP - RFC1918 clients are the same as if the traffic were routed out onto the Internet and back. Edit 2: Ok, disconnecting the external Internet connection will still give the same, crappy transfer speed. So it has to be something else. Edit 3: Ok, I guess there are other reasons for this crappy speed. Case closed. :)

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  • Debian can't connect to internet using LAN

    - by tampe125
    I have a headless Raspberry Pi using Debian Wheezy. I have a wifi dongle and if I connect my Raspberry using it, everything works fine: I can connect to the Internet, I can ping, I can update. However, if I get down my wifi and set up the lan interface, I lost my internet connection. I still can connect locally, using my laptop, but the connection doesn't exit (ie ping is not working). Some useful info: cat /etc/network/interfaces auto lo auto eth0 iface eth0 inet static address 192.168.0.105 netmask 255.255.255.0 gateway 192.168.0.1 ping www.google.com (nothing request timed out) ifconfig eth0 Link encap:Ethernet HWaddr b8:27:eb:a2:b5:20 inet addr:192.168.0.105 Bcast:192.168.0.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1130 errors:0 dropped:0 overruns:0 frame:0 TX packets:1116 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:97223 (94.9 KiB) TX bytes:146140 (142.7 KiB) ping 192.168.0.1 PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data. ^C --- 192.168.0.1 ping statistics --- 19 packets transmitted, 0 received, 100% packet loss, time 18007ms cat /etc/resolv.conf nameserver 8.8.8.8 netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface default 192.168.0.1 0.0.0.0 UG 0 0 0 eth0 192.168.0.0 * 255.255.255.0 U 0 0 0 eth0 well, I think that's all... Any ideas?

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  • Debian can't connect to internet using LAN

    - by tampe125
    I have a headless Raspberry Pi using Debian Wheezy. I have a wifi dongle and if I connect my Raspberry using it, everything works fine: I can connect to the Internet, I can ping, I can update. However, if I get down my wifi and set up the lan interface, I lost my internet connection. I still can connect to it locally, using my laptop, but the connection doesn't exit (ie ping is not working). Some useful info: cat /etc/network/interfaces auto lo auto eth0 iface eth0 inet static address 192.168.0.105 netmask 255.255.255.0 gateway 192.168.0.1 ping www.google.com (nothing request timed out) ifconfig eth0 Link encap:Ethernet HWaddr b8:27:eb:a2:b5:20 inet addr:192.168.0.105 Bcast:192.168.0.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1130 errors:0 dropped:0 overruns:0 frame:0 TX packets:1116 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:97223 (94.9 KiB) TX bytes:146140 (142.7 KiB) ping 192.168.0.1 PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data. ^C --- 192.168.0.1 ping statistics --- 19 packets transmitted, 0 received, 100% packet loss, time 18007ms cat /etc/resolv.conf nameserver 8.8.8.8 netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface default 192.168.0.1 0.0.0.0 UG 0 0 0 eth0 192.168.0.0 * 255.255.255.0 U 0 0 0 eth0 well, I think that's all... Any ideas?

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  • Disable option never goes away for network adapters

    - by mathee
    Hi, guys, I'm running Windows 7. Whenever I disable the wireless adapter, the "Disable" option does not change to "enable". Similarly, for the "Local Area Connection", when I click on "Disable", the adapter gets disabled, but the "Disable" option remains. In summary, I am never offered the option to enable an adapter.

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  • Why would one of my servers stop being able to access other servers by FQDN?

    - by Newlyn Erratt
    I have a number of servers on our local network and our debian server has suddenly stopped being able to access the other servers via their FQDN. Initial symptom was inability to login with Active Directory accounts. On further inspection, this machine, porkbelly, was unable to access our other servers (e.g. bacon and albert) via their FQDN. That is, they can ping albert by running ping albert but not by running ping albert.domain.local though when running ping albert it will be expanded to albert.domain.local. The server is still accessible from other servers via both porkbelly and porkbelly.domain.local. Upon examination of hosts information and running hostname its hostname and FQDN are correct. The resolv.conf appears correct. It contains: domain domain.local search domain.local nameserver 192.168.0.xxx (the nameserver) The dns server is also our Windows AD server. I'm not even sure where to go from here or why dns seems to be partially working though I don't have much experience. Where should I go from here? What might be causing this issue where machines are visible via their hostname but not their FQDN?

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  • Do all the network cards use the same frequency to send signals to wire?

    - by smwikipedia
    I am comparing my cable TV wire to my network wire. In a TV cable wire, different frequencies are used by different TV channels. And since a certain channel use a fixed frequency, I think the only left way to represent different signal is with the carrier wave's amplitude. But what about the network wire? For all the network cards with the same type, do they also use different frequencies to send signals just like TV cable? I vaguely remember that they use frequency adjustment to represent signals. So the frequency should not be a fixed one. So how did all the network cards that sharing the same medium differentiate their own signal from others?

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