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  • Set up layer 2 vlan between 2 data centres

    - by user41679
    Hello, Our data centre provider operates 2 sites, and we currently have equipment in one and would like to have equipment in the second. They've told me that they operate a layer 2 vlan between the 2 sites over a 20gbit connection, and that they'd just give me ethernet cable at each end to connect the locations. At the current site, we have Cisco 2960 48TC-L switches, all the machines are on a 192.168.x.x subnet and we have cisco firewalls with which we connect to our internet provider with. My question is what would I need to do to connect the 2 sites? could I just plug the ethernet cables the provide into the cisco switches, and have the same switches the other end? would I need to set up a separate internal network on the other side and connect both through the firewalls? Would the cisco switches need special configuration? We expect to maintain a number of connections between the 2 sites, and each site would have its own internal dns name like dc1.xx.com. Sorry if I'm being vague or haven't included enough information, I've a fairly good knowledge of hardware but we're down a netops guy at the moment and I'd like to get both sites on-line ASAP! Thanks in advance!

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  • VMware vSwitches and spanning tree

    - by dunxd
    I have two redundant core switches I want to connect to a new vSwitch I am setting up on a VMware ESX host. The switch will have two physical NICs each of which will connect to one of the core switches. The core switches are connected. If this was a physical switch, I would worry about connecting it to both core switches, because this would create a network loop. Do I need to worry about this for a VMware virtual switch? VMware's documentation says it is not possible to connect two vSwitches in a loop, therefore STP is not required. However, I am worried about connecting two physical switches together via a vSwitch.

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  • Opinion choosing Switch

    - by mastercode
    ) i have to reestruct a LAN network, with (currently) +/- 60hosts connected ... i have File Servers hosted, VoIP Phones,wireless AP's,printers, scanners, plotters,biometric dispositive,and 2 QNAP TS412 as FileServer and BackupServer, a Mac Mini as main Server of almost all services that need server ... and, a HP V1910-24 (L2+) and another two switches,but, only L2. which switch in your opinion, could fit better this reestruct, to ensure a VLAN division- and have to support Inter VLAN routing also - provide better performance, and also, allow a Future expansion. the budget, is low xD hehe!!

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  • Run command on init and restart on errors

    - by chersanya
    I have internet access on my PC through proxy through SSH, so every time I need to execute ssh -L PORT:SERVER:PORT LOGIN@SERVER and then type a password. After each network failure or reconnect this command has to be executed again. I've got bored of it and look for a way to do this automatically: first run this after boot (it doesn't seem to be a problem - put this command in some init file and that's all) and then rerun it (if possible, then type password) on each network failure. Is it possible, and how? OS Linux (Debian)

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  • list and explanations of ways to boost this router's signal strength? [closed]

    - by barlop
    Possible Duplicates: Improve Wireless Signal How to get wireless coverage over my whole house? What's the best way to increase the range of my 802.11g router? The back of my house doesn't have WiFi Signal I'm interested in ways that are both specific to certain routers, and generic. When I say generic, I don't necessarily mean a one way that works for many.. but it can also be a generic answer, so mentioning solutions for different situations. So not just the one router I mention. Explanations are important, as well as all the ways. One i'm particularly interested in boosting the strength of is this wireless router/modem Netgear VMDG280 maybe anywhere in a big house with three floors, maybe from the garden.

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  • Is this one network or two networks?

    - by colemik
    I have this simple question and really don't know the answer. Does the drawing below show one network or two networks? This is a question about the definition of a network from the OSI / TCP/IP model point of view: From one point of view, those are two L2 networks connected with a bridge. From another point of view, this is one L3 network, that can have a common L3 address space (like 10.1.1.0). PS If this question is too dumb, please move it to Superuser.

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  • Secondary fallback/failover network on Cisco ASA

    - by tyranitar
    In my network there is a Cisco ASA 55x0 with "inside" interface (network 192.168.79.0/24) and "outside" interface (network 89.x.x.48/29) There is this nat rule: object network NAToutside nat (inside,outside) dynamic interface and the static route route outside 0.0.0.0 0.0.0.0 89.x.x.49 1 and all ACL rules. Now I have another new outside network by another ISP called "outside2", this network is already natted and the Cisco ASA in in the network 192.168.70.0/24. I would use this network as a fallback one. So I set the nat rule: object network NAToutside2 nat (inside,outside2) dynamic interface and the static route with a different metric route outside2 0.0.0.0 0.0.0.0 192.168.70.1 2 Clearly it doesn't work: when I disconnect the outside ethernet cable no workstation can connect to the Internet throught the outside2 network... What do I need more?

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  • Setting up remote filesystem access without root privileges

    - by Luke Massa
    OK here's the situation. I have a computer A with complete admin access, and computer B (actually an account I login to) with very limited access. I am trying to make it so I can access a device on computer A (an external harddrive) on B. If I had more access to B, I would just mount the device on B, but I can't do that. I can ssh both directions, so theoretically I can copy data both directions, so it should be possible. I think a NFS might be helpful for me, but from what I've looked at, they all require the client to at some point perform a "mount" operation, something my client can't do. Thoughts?

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  • Cannot Access Server from External IP (Router)

    - by mindoftea
    We have an Ubuntu 10.04 LAMP server running on site (Apache is on port 80). It is running fine through the LAN, but I cannot access it using its external IP address through the Netopia 3000 Series modem by which it is connected to the internet. I have tried using what Netopia calls "Pinholes" (Port Forwarding) to make the server accessible, but a telnet to the external address just gives me "connect to address x.x.x.x: Operation timed out." I have also tried enabling "Services" and "IP Passthrough" on the router, but it gives the same result as above. How can I enable the server to be accessed through its external IP address? Because it connects fine locally, it would seem to be a problem with the Netopia router. Update: Booting the server in GUI mode instead of text mode solved the problem instantly. Any ideas why?

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  • How to route traffic via another machine before the default gateway

    - by Rich
    At the moment I have a router on 192.168.0.1, a Linux box on 192.168.0.2 and desktop clients from 192.168.0.3. Everything works with 192.168.0.1 as the default gateway. I'd like to send the traffic from the desktop clients via the Linux box before it goes out through the router so I can sniff the traffic (some of these are wireless connections). Can I set the default gateway to 192.168.0.2 on the desktop clients and then perhaps add some iptables rules to forward this traffic through 192.168.0.1? Quite happy to change the client desktops to another subnet if that makes it easier. Thanks in advance.

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  • Why would one server be sending DUP ACK packets to one PC, which is responding with HTTP RST packets?

    - by IronicMuffin
    I'm not a network profressional, so please excuse any wrong language. I was debugging why my DNS traffic was a constant 160Kbps on our corporate network. I opened up a wireshark trace, and I see one PC of a coworker broadcasting HTTP [RST] packets to one of our DMZ servers at the rate of 1000 a second. He restarted his machine, and as soon as it went offline, the server started broadcasting [DUP] [ACK] packets, until he came back online. It then resumed the HTTP [RST] packets. Apparently this server has been doing this kind of behavior since it went live. I believe it did this with a printer and an access point as well. Can anyone explain why this behavior is occurring? Any solutions? The initial research was done because there have been "bandwidth issues" and I wonder if this is contributing.

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  • I dont understand why [closed]

    - by gcc
    I dont understand why they vote down my question ,I couldont understand them -they do know nothing ,donot try to solve it-but they do vote down.If you do know nothing , dont fuck something or dont try to mess up

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  • How to disable wifi usage on Windows 7

    - by Eric
    On a laptop, we currently use LAN(RJ45) connection to access internet. But from time to time, on startup, the laptop "catch" an unsecured wifi hotspot from one of my neighbors, so we would like windows 7 to NOT choose any wifi network : how this can be done ?

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  • How can Icheck how much data has been transfered in a particular remote computer in my LAN?

    - by oDx
    I am the system administrator. I am suspecting some unwanted data transfers in some of the computers under my lan. This also effects the overall performance of the network. Is there anyway by which i can check the transfered data over a particular interval. I am not supposed to install any applications on any other computers than mine. I have the router access. I can use tools like ettercap dsniff wireshark etc.

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  • What if any free video player for windows can I set a custom frame buffer for streaming over the wifi?

    - by user268883
    I currently use DAUM PLayer (Pot Player) but I have problems streaming video to my laptop unless it is plugged into the network. An easy fix (so I thought) would be to find a player were I could adjust the cache / buffer so say 5 mins+ is read to the local Hdrive and then played from there... I can not work out how to do this in any player I have VLC, MPCHC and DAUM installed. All I want to do is increase the file buffer so X amount of the networkfile is copied to the local drive and then played... so all stuttering is stopped? How do I do this?

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  • Seemingly random disconnections on Windows Server 2008 R2

    - by bobblez
    So I have a box running a Windows Server 2008 R2 in my LAN, which is running, among other things, a voip server used by other people. I myself am in the same subnet with the server, while the other users are not. Now, maybe on average twice a day, all the other users get disconnected from the server (and if I take a remote desktop connection to it, I'm not able to open any web pages either). These disconnections usually last only about 5 seconds, but sometimes they may last up to a minute. What could possibly cause this? I have all the updates installed from windows update and the motherboard of the server is asus p5b deluxe (if that is of any interest). edit: Forgot to mention that my own internet connectivity stays intact while the server's does not, and both computers are behind the same router.

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  • How to set up vpn tunnel (ipsec) connection

    - by Alfwed
    I'm working with a client who wants to set up a vpn tunnel between their network and ours. They're in charge of the tunnel and to give us the access they are asking me my public IP and my LAN IP. This is what i've got when i do an ifconfig on the server i will use to connect to the vpn $ ifconfig eth0 Link encap:Ethernet HWaddr d4:ae:52:cd:xx:xx inet adr:62.210.xxx.xxx Bcast:62.210.xxx.xxx Masque:255.255.255.0 adr inet6: fe80::d6ae:52ff:xxxx:xx/64 Scope:Lien UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Packets reçus:55255032 erreurs:0 :779628 overruns:0 frame:0 TX packets:5419527 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 lg file transmission:1000 Octets reçus:5598164393 (5.5 GB) Octets transmis:1034297288 (1.0 GB) Interruption:16 Mémoire:c0000000-c0012800 lo Link encap:Boucle locale inet adr:127.0.0.1 Masque:255.0.0.0 adr inet6: ::1/128 Scope:Hôte UP LOOPBACK RUNNING MTU:16436 Metric:1 Packets reçus:45923382 erreurs:0 :0 overruns:0 frame:0 TX packets:45923382 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 lg file transmission:0 The inet adr:62.210.xxx.xxx is my public IP but it seems like i dont have any LAN IP. Can the connection work without LAN IP or should I create a private network somehow?

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  • Override my ISP's "domain not found" page?

    - by Amanda
    If I screw up typing a URL, my ISP shoots me over to their branded search page. So if I type "superuser" in my location bar I end up at http://domainnotfound.optimum.net/cablevassist/dnsassist/main/?domain=superuser I'd like my browser to leave the location the way it was and just say "nothing doing," rather than redirecting me to a search. Can I override that in my own /etc/hosts or at my router?

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  • Spoof database connection to be local instead of remote

    - by spydon
    I am trying to connect one of our clients "as is" programs to a remote database instead of a local one, they say that they have coded it to be able to do it, but for some reason the program crashes when trying to connect to a remote database. I don't have the source code so I can't really dig much deeper than that and the company does not provide any upgrades or custom modifications. I can succesfully connect to the database through SqlDbx and HeidiSQL so I know that the server is set up correctly. This is why I need to find a way to spoof a remote connection on port 1433 to appear like a local database connection to the program. I thought about editing the hosts file, but it will most likely crash other programs if I bind localhost to another IP than 127.0.0.1. Any ideas?

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  • Backup/Multihomed network connection

    - by J_P
    We have a couple locations that require 24/7 access to Internet and our current provider (AT&T) while mostly good is not always up. My concern would be if I go with another provider (for example Comcast) I'm going to be subject to the same down time if it's in the "last mile". I for the most part don't know where the failure points are on the ISP side but I would imagine the large majority are within the last mile. I'd looked at Mifi or similar solution but have concerns about bandwidth caps and overall speed. Any suggestions would be appreciated.

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  • Fedora 17 transparent Ethernet Bridge not forwarding IP traffic

    - by mcdoomington
    I am running on Fedora 17 with the latest ebtables and have been trying to setup a transparent bridge - using the following script, I send a ping through the bridged host and only see the requests on the bridge (among other traffic from eth0), BUT, arps and arp replies are making it through. My host is setup - Client 192.168.1.10 <-- eth0 -- eth2 192.168.1.20 Ethernet script: #!/bin/sh brctl addbr br0; brctl stp br0 on; brctl addif br0 eth0; brctl addif br0 eth2; (ifdown eth0 1>/dev/null 2>&1;); (ifdown eth2 1>/dev/null 2>&1;); ifconfig eth0 0.0.0.0 up; ifconfig eth2 0.0.0.0 up; echo "1" > /proc/sys/net/ipv4/ip_forward; ebtables -P INPUT DROP ebtables -P FORWARD DROP ebtables -P OUTPUT DROP ebtables -A FORWARD -p ipv4 -j ACCEPT ebtables -A FORWARD -p arp -j ACCEPT Any assistance would be great!

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  • Is it possible to create a full "encrypted worried about privacy" VPS, but still being externally us

    - by Somebody still uses you MS-DOS
    I've been reading a lot of things about privacy, "being in control of your data" and everything, and now a project called diaspora* is trying to be an OSS Facebook alternative. Fact is: you still have to use a server. Even if you use a VPS somewhere, they still have access do your data, so diaspora* isn't that protective shell people are looking for absolute power over your data unless you create a server on your basement. My question is: is it possible to create a really encrypted usable server using a VPS? From database to source files? If not, what it can be "obfuscated" or encrypted? (And just a mention, not really my question, do you think is diaspora* really possible to be made?) (I know if you really want privacy you shouldn't be even using these services and being social, but I'm asking if it's possible to at least avoid companies using your data)

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  • How to prefer ipv6 over ipv4 only for specific websites?

    - by kria
    I only have ipv6 connectivity via a HE tunnel on my router, so normally I want to prefer ipv4 over ipv6. For some websites however, I would like to prefer ipv6. Right now I have just set DisabledComponents to 0x20 and hard coded the ipv6 resolution into my hosts file for the sites i want to access over ipv6. Since these ip addresses change at times, this is not a good solution. Any ideas on how to handle this in a non-clunky way? Some kind of Chrome/Firefox add-on might do the trick, but I couldn't find one for this purpose.

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