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• Mass change Microsoft DNS & IIS server settings

  - by Antonius Bloch

  I need to change about 100 DNS records and IIS configurations on a Windows 2003 web server. The gui doesn't accommodate it and the MS command line tools seem incomplete (for example: dnscmd cannot edit a record, only create). Is there a third party tool out there I can use? Basically I just need to change one IP address to another. <vent It's frustrating that what would take a simple search and replace in Linux is this massive exercise under Windows. I mean IIS 6 wasn't Microsoft's first web platform! What were they thinking??? </vent

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• Add power over Ethernet without new switches?

  - by dannymcc

  I need to power 16 IP phones over their Ethernet connections. I am in the process of changing our switches and only the phones need PoE, everything else is powered by mains cables. I have contacted the supplier of the phones and for 16 mains leads it will be close to £300. I know it's possible to get a PoE injector that goes between the mains and the phone but I would like to do this as tidily as possible and ideally in bulk. I imagine something that looks like a switch but doesn't actually 'switch' if that makes sense. Basically I want to inject power to 16 devices at once.

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• Cannot connect to Musicbrainz VirtualBox through SSH using Mac

  - by olovholm

  I am trying to connect my mac terminal shell to a VirtualBox running the Musicbrainz server. I have configured the network through a BridgeAdapter and running ifconfig on both the host and the guest show corresponding IP addresses. I can now ping the guest, but I cannot connect through SSH. The verbose output from the SSH client on my mac states: (olaenv)hf-79-202:Python oclovhol$ ssh -vv [email protected] OpenSSH_5.6p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /etc/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to 127.0.0.1 [127.0.0.1] port 22. debug1: Connection established. debug1: identity file /Users/oclovhol/.ssh/id_rsa type -1 debug1: identity file /Users/oclovhol/.ssh/id_rsa-cert type -1 debug1: identity file /Users/oclovhol/.ssh/id_dsa type -1 debug1: identity file /Users/oclovhol/.ssh/id_dsa-cert type -1 ssh_exchange_identification: Connection closed by remote host

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• Running bridged-networking vmware player on a Linux machine with 2 interfaces

  - by Roman D

  I have got a laptop running Arch Linux with 2 interfaces: wireless (wlan0) and ethernet (eth0). I use wlan0 to access internet (static IP, networking is configured using netcfg), and I connect a second PC to the eth0. Now, whenever I start vmware player (v. 4.0.4), it chooses wlan0 to connect its bridged virtual NIC to, but I need it to connect to eth0 (I want my guest machine to be able to talk to the second physical PC on eth0). So, I disable the wlan0 interface (netcfg -d wireless) and restart vmware. Now, it connects to eth0, and everything works fine; I can ping the host PC from the virtual one, and I can ping the virtual PC from the second physical PC connected to eth0. Then, if I try to reenable the wlan0 interface (netcfg -u wireless), all of the connectivity between the host and the guest (and between the second physical PC and the guest) gets lost, until I disable wlan0 again. Can someone please give me a hint on what's going on?

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• cassandra node discovery

  - by eQuiNoX__

  I just set up a 3 node system with ip addresses "192.168.0.101", "192.168.0.102", "192.168.0.103". I have set the seeds value on the configuration of all three machines as seeds: "192.168.0.101,192.168.0.102,192.168.0.103" However, on running nodetool on any of them, only the 103 machine gets discovered. node101:/opt/cassandra/apache-cassandra-0.8.5/bin# ./nodetool ring -h 192.168.0.101 Address DC Rack Status State Load Owns Token 192.168.0.103 datacenter1 rack1 Up Normal 151.96 KB 100.00% 38174485210079977599903748344879358256 Could someone tell me where the problem lies?

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• Detecting man-in-the-middle attacks?

  - by Ilari Kajaste

  There seem to be many possible ways to create man-in-the-middle attacks on public access points, by stealing the access point's local IP address with ARP spoofing. The possible attacks range from forging password request fields, to changing HTTPS connections to HTTP, and even the recently discovered possibilit of injecting malicious headers in the beginning of secure TLS connections. However, it seems to be claimed that these attacks are not very common. It would be interesting to see for myself. What ways are there to detect if such an attack is being attempted by someone on the network? I guess getting served a plain HTTP login page would be an obvious clue, and of course you could run Wireshark and keep reading all the interesting ARP traffic... But an automated solution would be a tiny bit more handy. Something that analyzes stuff on the background and alerts if an attack is detected on the network. It would be interesting to see for myself if these attack are actually going on somewhere.

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• In ufw is there any way to disable logging for a particular rule?

  - by thomasrutter

  I am using UFW with a default logging policy of "low". I would like to keep this logging on for the default deny action, but disable it for a particular IP address only. So I'd like to create one particular new rule that doesn't have logging. Is there a way to achieve this? I have a rather uncomplicated ufw setup so far, like this: Status: active Logging: on (low) Default: deny (incoming), allow (outgoing) New profiles: skip To Action From -- ------ ---- 22/tcp LIMIT Anywhere 80/tcp ALLOW Anywhere 443/tcp ALLOW Anywhere 22/tcp ALLOW Anywhere (v6) 80/tcp ALLOW Anywhere (v6) 443/tcp ALLOW Anywhere (v6)

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• Failed pinging a LAN card of the server from the client using shared internet connection

  - by bobo

  The server (Windows XP Pro SP3) has two LAN cards (LAN card A and B) and is connected to the internet using ADSL. The ADSL connection is shared to LAN card B using Internet Connection Sharing. The client (Windows XP Pro SP3) has one LAN card, and is connected to LAN card B of the server so that it has access to the internet. The IP address on the LAN cards are defined as follows: Server: LAN card A: 192.168.0.3/24 (manually defined by me) LAN card B: 192.168.0.1/24 (manually defined by Internet Connection Sharing) Client: LAN card: 192.168.0.123/24 (assigned by DHCP) Default gateway: 192.168.0.1 From the server, I can ping 192.168.0.123 successfully. From the client, it can access the internet without any problem. I can also ping 192.168.0.1 successfully but for 192.168.0.3, it failed with the Request Timeout error message. Why did the ping fail, and what should be done to make the ping possible? (all firewalls have been turned off.)

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• Load balancing with rsync

  - by David

  i have 2 server with public ip: SERVER A - 10.10.10.11 SERVER B - 10.10.10.12 both of them are centos 6 in OS, installed nginx with php-fpm, 2 exact same website stored at: /var/www/html. Domain with: myxdomain.com and dns hosted with cloudflare ( since cloudflare do support round robin ) to point the domain to A record of 10.10.10.11 and 10.10.10.12. I know that round robin dns does not cover the failover or fallover, but it does not matter, what i need is: How do i sync the both content of /var/www/html server A and server B to be exactly same? Lets say: 1) user uploaded their file to server A, the file content will be sync to server B as well. 2) user uploaded their file to server B, the file content will be sync to server A as well. rsync will be good choice here? Any example of command line and cronjob time that suitable? thanks

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• Where to begin with IPv6 [closed]

  - by Willem de Vries

  I am fairly familiar with setting-up IPv4 networks for bigger server configurations, only now I wanted to start familiarizing myself with doing the same for IPv6. I have been Googling for the second night in a row for things like: IPv6 network design, IPv6 for dummies, etc. So far most things you find go on about why IPv6 and the amazing amount of numbers that we have now. Yet I am looking for practical stuff, for example: what would be a good way to assign IP-number, as I understand it DHCP shouldn't be the default course of action. How do other assignment methods work with DNS configuration? what would be a good or standard way of dividing the network in to sub-nets? (database, application, web servers spread over multiple domains/applications and some what intertwined) In short I would like to find good resources with practical information books, webpages, etc.

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• SSL Proxy: Forwarding without the encryption

  - by John

  I have a python application listening on port 9001 for HTTP traffic. I'm trying to configure Apache (or anything, really) to listen on port 443 for HTTPS connections, and then forward the connection, sans encryption, to port 9001 on the same machine. My application would then reply via the proxy, where the encryption would be reapplied, and returned to the client transparently. I'm not doing anything crazy with the site names and SSL certs, I have one public IP, one hostname, and one SSL cert. Stripping the encryption at the proxy doesn't seem to be a common requirement. Is what I'm asking for a normal requirement? Are there other concerns with this sort of configuration?

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• Confusion about TCP packet analysis terms

  - by Berkay

  I'm analyzing our network and have some confusion about the terms: this is the 2-packet output from source to destination. from these i have to get some features as describe, pls make me clear... packets with at least a bytes of TCP data payload: it seems tcp.len0; The minimum segment size (confusion is headers are included or or not) The average segment size observed during the lifetime of the connection, the definition: is calculated as the value reported in the actual data bytes divided by the actual data pkts reported. Total bytes in IP packets, should be ip_len value. Total bytes in (Ethernet) The total number of bytes sent probably related to frame.len and frame.cap_len these two terms are describes as, also make me clear about these two terms. frame.cap_len: Frame length stored into the capture file frame.len: Frame length on the wire

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• does heartbeat v3 support same resource agent types of pacemaker?

  - by Emre He

  As we know, Pacemaker supports three types of Resource Agents, ? LSB Resource Agents, ? OCF Resource Agents, ? legacy Heartbeat Resource Agents http://www.linux-ha.org/wiki/Resource_Agents does heartbeat v3 support above 3 types resource agent? or it only support LSB and legacy heartbeat resource agents? because we have only virtual ip and one service need to switch in ha cluster, so we decide not involve pacemaker, so we come to this question, for example we cannot monitor the application service by heartbeat, heartbeat only can handle to start it on active node. thanks, Emre

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• OpenDNS servers initial response is very slow

  - by Ben Collins

  I've got a Time Warner cable ISP package (RoadRunner), and the modem they gave me doesn't allow me to specify which DNS servers to use; it always uses whatever the upstream dhcp server gives it. I prefer to use OpenDNS on my home network, so i've configured a couple of my PCs manually in the Windows adapter settings for IPv4 such that their IP addresses are obtained via DHCP, but the DNS server settings are fixed to the OpenDNS server IPs. Now, when I startup Windows on these PCs, it always takes 2-3 minutes to start receiving responses from the DNS servers; any request before that times out. While not debilitating, this is quite annoying. Any ideas why this might be happening?

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• Connected 2 routers, but they won't talk

  - by ekolis

  I'm trying to set up a second WLAN at home (since the Nintendo DS firmware won't connect to my WPA-encrypted main WLAN), but when I connect my second router's WAN port to one of my main router's LAN ports, the routers won't talk, and I can't connect wirelessly to the second router. I can still see the second router's WLAN - I am just unable to connect to it. And it seems that even the main router can't see the second router, despite being plugged directly into it - I went to the main router's admin console and pinged the second router (which is receiving an IP address), but it was unable to reach it! Does anyone know what might be wrong? Thanks!

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• Configure apache to reverse proxy for specific name

  - by Phrogz

  I have a working intranet server that: Properly serves some content from http://hqmktgwb01/ Is currently properly configured to reverse proxy from http://hqmktgwb01/dashstats to a round-robin of localhost:3000 - localhost:3003 Also has the DNS name dashstats (going to the same IP) The current working configuration file can be found here: http://pastie.org/1426082 I would like to modify the configuration so that:    4. http://dashstats/ performs the same reverse proxying http://hqmktgwb01/dashstats. I (naively) modified the config like this: http://pastie.org/1426047 (added lines 90-98) but this is not a valid Apache config. Please help me to modify the original config file to accomplish 1-4 above.

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• What is the best way to configure Apache or AWS to support a Rails multi tenancy application that allows each customer to have their own domain name?

  - by Ryan Arneson

  I'm building a Rails 3 SaaS site that allows for multi-tenancy. When a customer signs up they put in their own domain name, e.g. example.com. I need example.com to point to my SaaS application and serve them their content. My questions are as follows: Do I need to create an Apache vhost for each customer using their own domain? Is there an easier way with CNAME's to just have the customer point to the IP address of my server(s) that then forwards the request onto my application through some catch all vhost? Would I be able to create the CNAME record for the customer so they don't have to do any setup? Would this be a case better suited to Amazon Web Services? Any help or explanation or corrections on my understanding of dns would be appreciated. I'm a developer so the server ops portion of this is a bit cloudy.

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• mod_proxy security

  - by brad

  I'm on Debian Lenny using apache2. in my proxy.conf I tried adding Allow from localhost as suggested in some other forums to get proxying to work. Didn't work. It only worked if I say Allow from all My question is this. Are there any security implications to this Allow from all directive? Most people were saying to make this as limited as possible, but "all" is the client right? I want anyone regardless of their IP to be forwarded properly. Is there a better way to configure this?

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• Bridge virtual machines out WLAN interface

  - by Thomas

  It seems that my wlan card (intel 5100 AGN) firmware doesn't allow "spoofing" MAC addresses. This has the side effect of destroying the capability to bridge out my virtual machines on that interface. Apparently this is a common thing on wlan cards. I can see the incoming traffic just fine in my virtual machines, but their DHCP queries don't get bridged out of the WLAN card. It works perfectly well when using the wired ethernet port. Is there a workaround for this? MAC-NAT or something? I don't want to route my virtual machines out to the Internet because I don't want my host OS to even have an IP address. I'm using Linux and KVM for virtualization.

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• System 67 error scheduled task to transfer files

  - by grom

  Running directly on command line the batch script works. But when scheduled to run (Windows 2003 R2 server) as the local administrator, I get the following error: D:\ScadaExport\exported>ping 192.168.10.78 Pinging 192.168.10.78 with 32 bytes of data: Reply from 192.168.10.78: bytes=32 time=11ms TTL=61 Reply from 192.168.10.78: bytes=32 time=15ms TTL=61 Reply from 192.168.10.78: bytes=32 time=29ms TTL=61 Reply from 192.168.10.78: bytes=32 time=10ms TTL=61 Ping statistics for 192.168.10.78: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 10ms, Maximum = 29ms, Average = 16ms D:\ScadaExport\exported>net use Z: \\192.168.10.78\bar-pccommon\scada\ System error 67 has occurred. The network name cannot be found. Any ideas? Google is turning up nothing useful, just keep finding results relating to DNS etc, but using IP address here.

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• DNS server failure when forwarding

  - by Abraham Katz

  I run Bind 9 on a Ubuntu 12.04 server. I want this server to be a sort of a "wrapper" over my default server, so that it will respond to "domain_name.My_TLD" itself and forward requests to any other request. The server resides in a domain (Disconnected from the internet), so I configured it to zone "company_domain."{ type forward; forwarders { 1.2.3.4 }; #the DC's ip }; When i query it about sommething.company_domain. it sends a query to the DC and gets a response, but it returns "server failure". What can cause that? Cheers, Abraham

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• Losing WLAN connections but maintaining internet connections on WIndows 7 Workgroup

  - by Di

  I have 4 computers all running Windows 7 networked in a Work group through Billion 7404vgp-m wireless router.All drivers and firmware for wireless adapters and router are up to date. Windows Firewall and Defender disabled.Disconnected ipv6. Running Nod 32 anti virus software. All have own static IP address 192.XXX.X.XXX. When I Reset the router all computers have Internet and LAN access for about 1 hour and then they will lose the LAN connection but maintain Internet connection. Resetting wireless adapters or restarting computers does nothing to fix this but resetting router will. What is causing this and how do I fix it. Thanks Di

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• How to gain admin privileges on D-Link router if my isp is not allowing me to do so?

  - by Fischer

  So I switched to new ISP yesterday, they gave me a D-Link router, can't use my old router. I want to change the wireless password, went to 192.168.1.1, I can login with the the username and password user user, but not as admin. On the catalog it says that the default username and password are admin admin, tried that didn't work. Tried admin and no pass, tried many combinations, none worked. I asked some other users and they said that the isp is blocking the users from logging in as admins, and blocking the reset button, and said that there's a hack where you do something like: cmd telnet "router ip" and do something like dumpcfg. Could you please give a better explanation on how to gain admin privileges on your own router if your isp is not letting you do so by default?

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• Find DNS server automatically

  - by jdickson

  I've got a Windows 2012 server set up as a domain controller and DNS server in my basement. On my laptop, if I set it to use the IP address of my server as the DNS server, then it works as expected. The problem with that is that I use my laptop outside my home network and I need to switch it back to automatic. Setup is like this: ISP Router running DD-WRT Win 2012 DC/DNS and other network computers How can I have my laptop find the DNS server automatically instead of using my ISP's DNS servers?

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• securing server to server http post

  - by ad-inf

  Website is developed on JSF, Servlet, using apache web server. In my website, I accept data submission from few restricted websites using HTTP POST method. We exchange some secure key to ensure that correct source is sending data. But is there any way to ensure that the data is submitted from specific domain / IP address only? In application level I can check request.header('Referer') , but some proxy or firewall might hide the referer. Can this configuration done on firewall or webserver level to authenticate server to server communication? Eg. Say my website is a payment gateway website, integrated with www.abc.com. I want only abc.com to submit data. So a user using abc.com should be able to submit data to my website only through abc.com, and not any other website.

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