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• Connecting to IPv6 hosts when mobile and on a Surface?

  - by Cerebrate

  Specifically, at my usual location, I have an IPv6 network which connects to the Internet via a static tunnel set up to Hurricane Electric's tunnel broker ( http://www.tunnelbroker.net/ ). This works essentially perfectly, allowing inbound and outbound connectivity. Now, however, I need to connect back to host(s) on that network over IPv6 from mobile tablet(s); meaning the conditions are such that there is no guarantee or even likelihood of native IPv6 support where it happens to be at any given time, and the IPv4 address of the tablet will change on a fairly regular basis. The native Teredo support, as configured by default, functions well enough to let me ping my target hosts, but appears to have neither the reliability nor the throughput to support anything else; I have been unable to make any actual connections (trying a number of TCP-based protocols) using it. I had considered setting up an independent tunnel for the tablet(s), and using scripts to update the client endpoint IP address when it changes, but since both (a) many of the locations will be behind NAT devices over which I have no control, and (b) the option over which I do have control is an AT&T Unite hotspot which does not offer protocol 41 forwarding or respond to ICMP on its public address, this approach does not seem viable. I am additionally constrained as the mobile tablet(s) in question are Surface RTs, and as such are incapable of running, for example, AICCU client software. What is my best option to pursue to obtain IPv6 connectivity in this scenario?

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• If I scp a file through an intermediate server, is the file stored temporarily on the server?

  - by Blacklight Shining

  For the sake of simplicity (I find it easier to remember names than arbitrary letters), I will dispense with letters and use names to refer to the machines in this scenario. Say I have two machines, applejack and pinkie-pie, each on their own separate LANs and not in the same physical location. I also have a server, cadance, with a direct Internet-facing connection. I want to copy a file from applejack to pinkie-pie, so to avoid dealing with port forwarding and such, I set up an ssh tunnel from pinkie-pie to cadance (ssh -R etc cadance). Now I can connect to pinkie-pie from anywhere, by connecting to cadance and specifying an alternate port to use. I can also easily copy files to pinkie-pie with scp -P $that_port $some_file cadance:$some_path. My understanding of how it works is this: A secure connection is made from applejack to cadance I am authenticated to cadance A secure connection is made from applejack to pinkie-pie that spans the existing reverse tunnel and the new connection from step 1. I am authenticated to pinkie-pie Files are copied directly from applejack to pinkie-pie over this connection. Am I correct here? How secure is this approach? If I'm wrong…are files copied this way decrypted at cadance before being passed on to pinkie-pie? Is there a possibility that traces of unencrypted data could remain on cadance?

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• Install self-signed certificate on local server (iis)

  - by ile

  On this page there are instructions on how to create self-signed cert (on apache) and how to install this certificate on server. I found this page (http://www.visualwin.com/SelfSSL/) with instructions on how to create self-signed certificate on windows (iis). I followed instructions and when I type https://myip/myapp (this leads to localhost because I set my router's port forwarding to go to localhost on my pc) this part works. From the first link, the most important part is this: What needs to be installed in IE is actually the Root CA Certificate. In the how-to above, the Root CA Certificate is called ca.crt. Copy this file to the server that is running QuickBooks. The following is for IE6: - Open IE - Tools - Internet Options - Content - Certificates - Trusted Root Certification Authorities Tab - Import, Next, Browse to 'ca.crt' - Next, Next, Finish, Close, OK The part that is missing in second link is that there is no instruction on how to get .crt file, so I tried to get it myself. What I did was following: I opened https://myip/myapp in Firefox and then "This Connection is Untrusted" screen appeared. Then I clicked on "Add Exception" and then below "Certificate Status" I clicked "View". Under the Details tab I clicked on Export and choosed Save as type: "X 509 Certificate (PEM)" and file was saved with .crt extension. Then I opened IE8 and followed above instructions. After opening https://myip/myapp in IE8 I always get warning screen. Does anyone knows what am I doing wrong? Thanks, Ile

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• How to get my W2003-server (back) into the web (after setting up bridged networking)

  - by MBaas

  I have recently set up Virtualbox on a W2003-Server (which is also used as webserver, accessed from the web). My vbox worked nicely, but then I wanted more, I wanted to have the vm appear in the intranet like any ordinary pc. I was advised to setup bridged networking as opposed to NAT. I did so, and in the server's network connections have bridged the LAN-Connection and the "VirtualBox Host-Only Network" (yes, it says "host only network", but I assure that VBox networking is configured to use network bridge). So now my VM is visible in the intranet and it also has www-accesss, the server can also access the web. The only problem that came up is that the server is no longer accessible from the web. I've traced an HTTP-Request and it says "Can't connect to *:80 (connect: No route to host)". So maybe something in the router's config needs to be adjusted (yeah, well, the server's IP-Address changed from 192.168.1.199 to ...198). So I went into the router-config, reviewed port-forwarding for port 80 and adjusted the IP there, but it still didn't work. Unsure if it was a router-problem or rather something in the server's config, I've setup a "demilitarized zone" in the router and have put the server into it. (My understanding is that this would put the server straight into the web...) But the result of the HTTP-Requests is still the same :(

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• Server 2008 NAT Internet Not Working

  - by Jack

  I'm trying to set up Routing and Remote Access on Windows Server 2008 R2, I have a network connection that I want to share the internet from to another private network. The server has two NICs which are configured as follows: External NIC (Dynamically assigned by ISP) IP:10.175.4.150 Subnet:255.255.192.0 Gateway:10.175.0.1 DNS:10.175.0.1 Internal NIC IP:172.16.254.1 Subnet:255.255.255.0 Gateway:None DNS:None I have set the external NIC to be the public interface and enabled NAT on it in the RRAS MMC and set the internal NIC to be a private interface. I have also set up the DNS forwarding or whatever it is in the NAT section. From a client (IP:172.16.254.2) I can ping the server and access files on it, when I try to browse the web with the default gateway set to the internal NIC ip I end up getting a 404 page which is returned from the ISPs default gateway. I'm guessing it's something to do with the double NAT possibly. Trying to ping the ISPs default gateway from a private network client just times out as does accessing it directly. I've disabled and reconfigured RRAS multiple times and that doesn't seem to have made a difference, so can anyone tell me what I'm doing wrong? Thanks.

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• Forward Apache to Django dev server

  - by Alex Jillard

  I'm trying to get apache to forward all requests on port 80 to 127.0.0.1:8000, which is where the django dev server runs. I think I have it forwarding properly, but there must be an issue with 127.0.0.1:8000 not being run by apache? I'm running the django dev server in an ubuntu vmware instance, and I'd other people in the office to see the apps in development without having to promote anything to our actual dev/staging servers. Right now the virtual machine picks up an IP for itself, and when I point a browser to that url with the defualt apache config, I get the default apache page. I've since changed the httpd.conf file to the following to try and get it to forward the requests to the django dev server: ServerName localhost <Proxy *> Order deny,allow Allow from all </Proxy> <VirtualHost *> ServerName localhost ServerAdmin [email protected] ProxyRequests off ProxyPass * http://127.0.0.1:8000 </VirtualHost> All I get are 404s with this, and in error.log I get the following (192.168.1.101 is the IP of my computer 192.168.1.142 is the IP of the virtual machine): [Mon Mar 08 08:42:30 2010] [error] [client 192.168.1.101] File does not exist: /htdocs

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• Postfix selective header_checks: smtpd_relay_restrictions vs. smtpd_recipient_restrictions

  - by luke

  Some of my customers implemented commercial software that violate email-RFCs such that we have had to relax our header checks. In consequence, we receive more spam. Prolog: I know the domains (customer.com) and IP-addresses (a.b.c.d/C) these emails come from Kind request for help: Is it possible to setup one Postfix (2.11) instance on Linux such that: It applies only some header checks for emails from .*@customer.com But applies all header checks for all other email sources? I thought of a combination of mynetworks that includes the subnet a.b.c.d/C in smtpd_recipient_restrictions -- allowing all these messages through -- and simultaneously avoid an open-relay with smtpd_relay_restrictions. However, this has not worked out as expected. Any idea or help is highly appreciated. Thanks in advance. Luke ==EDIT== For the current issue, I solved the problem by prepending REDIRECTs to header_checks as follows: /^received: from.*customer.com.*by mail.own.com.*for.*luke@own.*/ REDIRECT [email protected] This works so far as neeeded. Irrespective thereof, I am still looking for a postfix configuration that would turn this text-based setting into an IP-Address-Range based forwarding rule.... Thanks. Luke

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• How to enable Ipv6 on my ubunutu 11.04 virtual machine

  - by liv2hak

  I have installed 3 VM's on my PC.(Ubuntu 11.04).I want to setup an IPV6 network to review and test some of the IPV6 tools like NDPMonitor.(monitors ICMP messages of Neighbour Discovery Protocol.) IP v6 addresses are as follows. linux_router - fe80::a00:27ff:fed5:f7e9/64 labhack1 - fe80::a00:27ff:fed2:8bd1/64 labhack2 - fe80::a00:27ff:fed7:2f2d/64 The below commands have been run on both linux_router and labhack1. sudo ip r a 2001:468:181:f100::/64 dev eth0 sudo vim /etc/radvd.conf /file looks like below./ interface eth0 { AdvSendAdvert on; /*means that we are sending out advertisments.*/ MinRtrAdvInterval 5; /*these options control how often advertisments are sent*/ MaxRtrAdvInterval 15; /*these are not mandatory but valueable settings.*/ prefix fe80::a00:27ff::/64 { AdvOnLink on; /*Says to the host everyone sharing this prefix is on the sam local link as you.*/ AdvAutonomous on; /*Says to a host: "Use this prefix to autoconfigure your address"*/ }; }; sudo sysctl -w net.ipv6.conf.all.forwarding=1 I try to do a ping6 -I eth0 fe80::a00:27ff:fed5:f7e9 I get Destination unreachable: Address unreachable.I am not sure what I am doing wrong here.I am a beginner at linux administration.Basically I think I am missing whatever is analogous to physically connecting VM's.Any help that would point me in the right direction would be greatly appreciated.

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• another "SSH connect to host github.com port 22: Bad file number"

  - by Mariusz

  Hello. I have a problem with my first-time ssh connection. Yes, I've already done yours guides, already tried your "Dealing with firewalls and proxies" article and the problem is still occuring. I am using Win7 32bit, Windows Firewall is disabled, haven't any third-party firewalls, ESET Nod32 Antivirus is not blocking any ports, I am not using any PROXY (neither local proxy) . Here goes the logs: Ordinary SSH connection try C:\Users\Mariusz>ssh -vvv [email protected] OpenSSH_4.6p1, OpenSSL 0.9.8e 23 Feb 2007 debug2: ssh_connect: needpriv 0 debug1: Connecting to github.com [207.97.227.239] port 22. debug1: connect to address 207.97.227.239 port 22: Not owner ssh: connect to host github.com port 22: Bad file number NCAT connection try C:\Users\Mariusz>ncat github.com 22 Strange connect error from 207.97.227.239 (10013): No error 10013 = WSAEACCES I think that method called "smart-http-support" won't be usable for me because I haven't created repo yet. I have just GIT INIT locally, and finished at step GIT PUSH, which returns the same: ssh: connect to host github.com port 22: Bad file number fatal: The remote end hung up unexpectedly corkscrew method (first article from yours guide) . While PUTTYing (with pageant in bg), after inputing login - an error is occuring (MessageBox): Disconnected: No supported authentication methods available And in terminal such message is printing out: Server refused our key Key I have generated correctly, using ssh-keygen. I tried not method by editing ~/.ssh/config yet because I had thought that because I haven't PUSHed anything to my remote repo so I won't be able to CLONE anything. Method called ssh-forwarding is not for my, cause it "requires access to an external ssh server" and I haven't any at this time. What else could I do? Thanks in advance for any help. Mariusz.

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• Printing to a remote printer through the internet

  - by Lock

  I have a remote network (A) that is connected to a head office (B) through a private network. Network A only has 1 PC that requires the connection, and this is into a terminal server at network B. We want to save money by getting rid of the private network as only 1 PC now access it and it seems silly to pay ~$400 per month for something that is accessed by 1 PC. A VPN tunnel is out of the question as the provider wants to charge $600 a month for a VPN tunnel (more than a private network? I might get them to check these numbers). I was thinking of 2 options: 1) VPN client on the PC. This wouldn't cost a thing as we already have VPN users available. 2) Open up a port on the firewall of network B, forwarding to the terminal server. Now the problem is this: On the terminal server, the program that is accessed is for printing labels to the printer that is at network A. The program is setup to send all print jobs to a printer that is setup locally on the terminal server, which has its port mapped to the IP address of the printer that is at network A. If we got rid of the VPN tunnel and used clients/open up firewall port, the printer would no longer be able to find network A, and hence printing would not work. Any ideas to combat this issue? Can the printers at the remote network be setup as internet printers? I've never had any experience with internet printers. Can you open up ports and map to a public static IP address?

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• Liferay - Verify each node in a cluster

  - by Schrute

  In this example, I have two clustered instances of Liferay using bundled Tomcat running, using cluster link and shared documents. Let's say the name of the public community is fubar and friendy URL used is fubar.lipsum.com. Let's say the ports listening on each server is 8080. If I go to both server1:8080 or server2:8080 I will get the default page for Liferay. How can I test fubar.lipsum.com on each node by using the backend server, so I can verify each server? If I test it, it just goes to the load balancer, I wish there was a way to append to the backend connection to bring it up. I can add the friendly URL to my local machines hosts file and this seems to kinda work, but then once something is called in the application, it tries to go out again from the backend server and then uses SSL and then we have problems. I think I may be able to do port forwarding, but this seems like a basic thing we should be able to do and what I've found so far in the admin docs has not helped. Using the option to print the server name in the page details isn't an option either.

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• Transparent proxying in MacOS X 10.6 Snow Leopard (and maybe FreeBSD)

  - by apenwarr

  I'm trying to create a transparent proxy on my MacOS machine in order to port the sshuttle ssh-based transproxy VPN from Linux. I think I almost have it working, but sadly, almost is not 100%. Short version is this. In one window, start something that listens on port 12300: $ while :; do nc -l 12300; done Now enable proxying: # sysctl -w net.inet.ip.forwarding=1 # sysctl -w net.inet.ip.fw.enable=1 # ipfw add 1000 fwd 127.0.0.1,12300 log tcp from any to any And now test it out: $ telnet localhost 9999 # any port number will do # this works; type stuff and you'll see it in the nc window $ telnet google.com 80 # any host/port will do # this *doesn't* work! After the latter experiment, I see lines like this in netstat: $ netstat -tn | grep ^tcp4 tcp4 0 0 66.249.91.104.80 192.168.1.130.61072 SYN_RCVD tcp4 0 0 192.168.1.130.61072 66.249.91.104.80 SYN_SENT The second socket belongs to my telnet program; the first is more suspicious. SYN_RCVD implies that my SYN packet was correctly captured by the firewall and taken in by the kernel, but apparently the SYNACK was never sent back to telnet, because it's still in SYN_SENT. On the other hand, if I kill the nc server, I get this: $ telnet google.com 80 Trying 66.249.81.104... telnet: connect to address 66.249.81.104: Connection refused telnet: Unable to connect to remote host ...which is as expected: my proxy server isn't running, so ipfw redirects my connection to port 12300, which has nobody listening on it, ie. connection refused. My uname says this: $ uname -a Darwin mean.local 10.2.0 Darwin Kernel Version 10.2.0: Tue Nov 3 10:37:10 PST 2009; root:xnu-1486.2.11~1/RELEASE_I386 i386 Does anybody see any different results? (I'm especially interested in Snow Leopard vs Leopard results, as there seem to be some internet rumours that transproxy is broken in Snow Leopard version) Any advice for how to fix?

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• Route all traffic via OpenVPN client

  - by Ilya

  I've got OpenVPN client running on 192.168.0.3. What I'd like to do is route all the traffic from the second computer with 192.168.0.100 via OpenVPN client that's running on the first computer. My router ip is 192.168.0.1 Network topology: Windows computer with OpenVPN client: 192.168.0.3 Windows computer whose traffic has to be rerouted: 192.168.0.100 Router: 192.168.0.1 I want it to work in the following way: 192.168.0.100 computer => 192.168.0.3 computer => OpenVPN => 192.168.0.1 How can I achieve that by only modifying windows' routing table? I've tried entering the following into windows shell(on computer without VPN), which didn't work (it just dropped my internet connection): route delete 0.0.0.0 mask 255.255.255.255 192.168.0.1 route add 0.0.0.0 mask 255.255.255.255 192.168.0.3 Should I also setup the computer that has OpenVPN client running? Does it have anything to do with windows tcp forwarding? Thanks!

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• Force local IP traffic to an external interface

  - by calandoa

  I have a machine with several interfaces that I can configure as I want, for instance: eth1: 192.168.1.1 eth2: 192.168.2.2 I would like to forward all the traffic sent to one of these local addresses through the other interface. For instance, all requests to an iperf, ftp, http server at 192.168.1.1 should be not just routed internally, but forwarded through eth2 (and the external network will take care of re-routing the packet to eth1). I tried and looked at several commands, like iptables, ip route, etc... but nothing worked. The closest behavior I could get was done with: ip route change to 192.168.1.1/24 dev eth2 which send all 192.168.1.x on eth2, except for 192.168.1.1 which is still routed internally. May be I could then do NAT forwarding of all traffic directed to fake 192.168.1.2 on eth1, rerouted to 192.168.1.1 internally? I am actually struggling with iptables, but it is too tough for me. The goal of this setup is to do interface driver testing without using two PCs. I am using Linux, but if you know how to do that with Windows, I'll buy it!

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• Upgrade an Ubuntu 8.04 installation with VMware Server 1.0.8 and lots of guest OSes to Something Els

  - by Glyph

  I have an Ubuntu 8.04 (Hardy Heron) host machine which is running a whole slew of virtual machines in VMWare Server 1.0.8. Among other guest OSes, there is every release version of Ubuntu since 6.06, OpenSolaris 2009.06, and Windows XP. Right now I access these VMs from a variety of client OSes as well; Linux and Windows via the VMWare server console, and MacOS via X-forwarding the host machine's server console. I'd like to upgrade the host to Ubuntu 10.04 (Lucid Lynx), but from what I can tell, getting VMWare Server 1.x to work on a more recent version of Linux is a real pain. While VMware Server 2.x is a bit easier, it's still not packaged as Debian packages, so installing security updates is a big chore. As long as I'm upgrading anyway, I'd like to move to a virtualization solution that will allow me to automate applying updates. The options that I'm aware of right now are KVM (managed via virt-manager) and VirtualBox (as managed by its own tools or via its own libvirt bindings), but I'm open to other suggestions. For each option, I'd like to know how do I convert my guest images to the new format? am I going to have to re-activate my Windows guests (alternatively, "If the virtual hardware is different by default, can I avoid re-activation by changing some virtualization configuration to provide me with more similar virtual hardware") what are the management options like for each client OS (mac, linux, windows)? Thanks.

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• Suggestions for accessing SQL Server from internet

  - by Ian Boyd

  i need to be able to access a customer's SQL Server, and ideally their entire LAN, remotely. They have a firewall/router, but the guy responsible for it is unwilling to open ports for SQL Server, and is unable to support PPTP forwarding. The admin did open VNC, on a non-stanrdard port, but since they have a dynamic IP it is difficult to find them all the time. In the past i have created a VPN connection that connects back to our network. But that didn't work so well, since when i need access i have to ask the computer-phobic users to double-click the icon and press Connect i did try creating a scheduled task that attempts to keep the VPN connection back to our office up at all times by running: >rasdial "vpn to me" But after a few months the VPN connection went insane, and thought it was both, and neither, connected an disconnected; and the vpn connection wouldn't work again until the server was rebooted. Can anyone think of a way where i can access the customer's LAN that doesn't involve opening ports on the router needing to know their external IP customer interaction of any kind Blah blah blah use vpn vnc protocol has known weaknesses you are unwise to lower your defenses it's not wise to expose SQL Server directly to the internet you stole that line from Empire Customer doesn't care about any of that. Customer wants things to work.

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• My VPS host (rosehosting) sold me a domain name, but I can't get it to work

  - by Faisal Vali

  My VPS host (rosehosting) sold me a domain name, but I can’t get it to work. They sent me an email with the following (almost a month ago) DNS Servers (unless you ordered your own DNS servers): ns1.rosehosting.com (216.114.78.148) ns2.rosehosting.com (216.114.78.155) Operating System: Ubuntu 9.04 Domain Name: mytestdomainfv.com Host Name: mytestdomainfv.com IP Address: .... Physical Host Name: Vs####.rosehosting.com When I type in the Physical Host Name or the IP from a remote computer I get connected to my VPS. But when i type 'mytestdomainfv.com' the name is never resolved, and it has been a month now. I thought that they would configure it so that it would, but it seems that they haven't. Does anyone know how I can get 'mytestdomainfv.com' to point to my VPS? I looked at some of the other similar questions, but they talk about forwarding GoDaddy domain names - so I'm not sure if it applies - but then again, it might just be my naivete. Any direction will be greatly appreciated. Thanks! p.s mytestdomainfv.com is not the real domain name

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• network latency, TCP and UDP packets

  - by user115848

  Hello recently my network has started to cause me lots of problems. I have a cable modem, connected to a tp-link router (with some port forwarding). Everything was working fine then i started to get lots of udp (port 53) "UNREPLIED" logs in the router. Now there are tcp UNREPLIED logs too. This is causing lots of latency and failed connections when trying to connect to different internet sites. Also, we run an openfire server for spark connections, and I believe its causing connectivity issues for some users who are trying to connect using Spark (some people connect fine, others don't). Please see screen shot below for packet logs. It has to be something internally, as I connected straight to the comcast modem and i was able to connect to the internet and various sites as normal. I tried to swap out the router with a different and got the same issue. I scanned both my internal dns servers for viruses or malware and it came up empty. Another anomaly is that when i try to connect to www.cnn.com, i get redirected to the different site. I scanned my own machine for hijacks. Not sure if this is related to the networking issue. Please let me know if you have any ideas for troubleshooting.

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• How do I create a wifi network bridge with qemu on OS X?

  - by a paid nerd

  I grabbed a small FreeBSD live CD and QEMU, and I'm trying to bridge my Mac OS X 10.8 wifi connection so that the guest OS is available on my LAN. However, the guest OS never gets a DHCP lease. This works perfectly with VirtualBox in their "bridged" network mode, so I know it can be done. I need to get it working with QEMU because VirtualBox doesn't support the architecture that I need for this project. Here's what I've done so far based on hours of googling: Installed TUNTAP for OS X Told OS X to supposedly forward all packets, even ARP: (NOTE: This doesn't appear to work.) $ sudo sysctl -w net.inet.ip.forwarding=1 $ sudo sysctl -w net.link.ether.inet.proxyall=1 $ sudo sysctl -w net.inet.ip.fw.enable=1 Created a bridge: $ sudo ifconfig bridge0 create $ sudo ifconfig bridge0 addm en0 addm tap0 $ sudo ifconfig bridge0 up $ ifconfig bridge0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether ac:de:xx:xx:xx:xx Configuration: priority 0 hellotime 0 fwddelay 0 maxage 0 ipfilter disabled flags 0x2 member: en0 flags=3<LEARNING,DISCOVER> port 4 priority 0 path cost 0 member: tap0 flags=3<LEARNING,DISCOVER> port 8 priority 0 path cost 0 tap0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500 ether ca:3d:xx:xx:xx:xx open (pid 88244) Started tcpdump with -I in the hopes that it enables promiscuous mode on the wifi device: $ sudo tcpdump -In -i en0 Run QEMU using the bridged network instructions: $ qemu-system-x86_64 -cdrom mfsbsd-9.2-RELEASE-amd64.iso -m 1024 \ -boot d -net nic -net tap,ifname=tap0,script=no,downscript=no But the guest system never gets a DHCP lease: If I tcpdump -ni tap0, I see lots of traffic from the wireless network. But if I tcpdump -ni en0, I don't see any DHCP traffic from the QEMU guest OS. Any ideas? Update 1: I tried sudo defaults write "/Library/Preferences/SystemConfiguration/com.apple.Boot" "Kernel Flags" "net.inet.ip.scopedroute=0" and rebooting per this mailing list suggestion, but this didn't help. In fact, it made VirtualBox bridged mode stop working.

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• Mac OS X - configuring ntpd server with on LAN with D-Link DIR-655

  - by Mark C

  Hey all, This question is pretty specific, but I hope someone will have seen this error elsewhere. I a configuring a machine running OS X 10.5.8 to be an NTP server for machines connected to a LAN that is not connected to the Internet. I am not too worried about knowing the "right" time on all the machines, but rather worried about making sure everyone has the same notion of time. I configured the NTP daemon on Mac by turning on the Set date and time automatically in System Preferences, using the server's clock, 127.127.1.0 as the reference clock. I figured I should see if the server can NTP query itself before proceeding to the clients. The weird part is when I run the ntpq -p command in a command-prompt when connected to my D-Link DIR-655 (firmware: 1.33), it hangs for about a minute or so each time before finally giving me some output. I thought the problem might have to do with Port Forwarding, so I configured the router to forward port 123 for the IP of the server, but that did not improve the situation. When I run the ntpq -p command on my school's network, on a Linksys WRT54G router, or with the wireless Airport card turned off - I have absolutely no problems - the command returns a response instantly. Is this normal? I can see why a query might take a minute or so, but I don't understand why one router does it faster than the other. I tried messing around with the ntp.conf file adding the burst, minpoll, and maxpoll options: server 127.127.1.0 burst minpoll 4 maxpoll 5 Figuring that perhaps I am polling too often and the configuration file is slowing me down, but even with this, the ntpq still hangs on the D-Link DIR-655, but does just fine on the other routers. Any thoughts on where the lag is coming from or if the lag is even a problem?

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• Choose identity from ssh-agent by file name

  - by leoluk

  Problem: I have some 20-30 ssh-agent identities. Most servers refuse authentication with Too many failed authentications, as SSH usually won't let me try 20 different keys to log in. At the moment, I am specifying the identity file for every host manually, using the IdentityFile and the IdentitiesOnly directive, so that SSH will only try one key file, which works. Unfortunately, this stops working as soon as the original keys aren't available anymore. ssh-add -l shows me the correct paths for every key file, and they match with the paths in .ssh/config, but it doesn't work. Apparently, SSH selects the indentity by public key signature and not by file name, which means that the original files have to be available so that SSH can extract the public key. There are two problems with this: it stops working as soon as I unplug the flash drive holding the keys it renders agent forwarding useless as the key files aren't available on the remote host Of course, I could extract the public keys from my identity files and store them on my computer, and on every remote computer I usually log into. This doesn't looks like a desirable solution, though. What I need is a possibility to select an identity from ssh-agent by file name, so that I can easily select the right key using .ssh/config or by passing -i /path/to/original/key, even on a remote host I SSH'd into. It would be even better if I could "nickname" the keys so that I don't even have to specify the full path.

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• Edit-text-files-over-SSH using a local text editor

  - by Mikko Ohtamaa

  I am working in various Linux and UNIX environments. I'd like to elegantly solve the problem of editing remote configuration files over SSH. Instead of using terminal editors (nano), I'd like to open the file in a local text editor on my desktop (Sublime Text 2). CyberDuck, WinSCP and various other SFTP apps can do this. Using editors over X11 forwarding has also proven to be problematic. Also using archaic text editors like Vim or Emacs do not serve my needs well. They could do this, but I prefer using other text editing software. Using ssh mounts (FUSE) are also problematic unless they can happen on the demand and triggered by the remote site. So what I hope to achieve Have a somekind of easily deployable shell script etc. which I can copy to remote server (let's call it mooedit) I run mooedit command on the remote server of which I have connected over SSH connection mooedit sends some kind of signal (over SSH( to my local desktop On my local desktop this signal is captured and it determines 'a ha! moo wants to edit a file on server X in folder Y' File is SFTP transfered to the local desktop (/tmp) File is opened in a nice GUI text editor on the local desktop When Save is pressed, the local desktop notices changes in the file and SFTP sends the resulting file back to the server The question is: What signaling mechanisms SSH provides for this? Any other methods to trigger a local text editor for remote SSH file?

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• Postfix unable to find local server

  - by Andrew

  I'm working with postfix on fedora 9 and I'm attempting to make some changes to a system setup by my predecessor. Currently the postfix server on [mail.ourdomain.com] is setup to forward mail sent to two addresses to another server for processing. The other server [www01.ourdomain.com] receives the email and sends it to a PHP script to be processed. Then that PHP script generates and sends a response to the user who sent the original email. We're adding more web servers to the system and as a result we've decided to move these processing scripts to our admin [admin.ourdomain.com] server to make them easier to keep track of. I've already setup and tested the processing scripts on [admin.ourdomain.com], and on the mail server doing the forwarding [mail.ourdomain.com] I added [admin.ourdomain.com] to /etc/hosts and also added another, aside from the one for [www01.ourdomain.com], entry to /etc/postfix/transport for [admin.ourdomain.com]. I also restarted postfix as well. I've tested the communication from [mail.ourdomain.com] to [admin.ourdomain.com] using telnet and the [admin.ourdomain.com] domain and everything runs correctly. But as soon as I change the forward address and attempt to send an email to the mail server I get a bounce message stating "Host or domain name not found. Name service error for name=admin.ourdomain.com type=A: Host not found". If I change the forward settings back to [www01.ourdomain.com] then everything works fine. Is there some setting I'm missing in Postfix? The server itself and telnet work fine it just seems to be postfix that's not able to discover the location of [admin.ourdomain.com].

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• Active Directory Child Domain Replication Problems

  - by MikeR

  Hi, I've recently inherited an Active Directory (all DCs Windows 2003) which has been configured with several child domains that are used as test environments for out CRM software. Two of these child domains have been used for testing using dates in the future (2015), throwing them well outside of the Kerberos tolerance for time, and they're flooding my event logs with replication errors such as the following: Description: The attempt to establish a replication link for the following writable directory partition failed. Directory partition: CN=Schema,CN=Configuration,DC=ad,DC=xxxxxxx,DC=com Source domain controller: CN=NTDS Settings,CN=TESTDC001,CN=Servers,CN=SiteName,CN=Sites,CN=Configuration,DC=ad,DC=xxxxxxx,DC=com Source domain controller address: 38e95b2a-35af-4174-84ba-9ab039528cce._msdcs.ad.xxxxxxx.com Intersite transport (if any): This domain controller will be unable to replicate with the source domain controller until this problem is corrected. User Action Verify if the source domain controller is accessible or network connectivity is available. Additional Data Error value: 5 Access is denied. I'd also like to upgrade to Windows 2008 at some point, but wouldn't want to attempt any schema updates while I'm not 100% confident on the replication. I'm guessing my only real solution will be to get rid of these child domains. The child domains are operating as stand alone domains, the DC is up and running and authenticating test users fine. I'm guessing the best solution to this would be to delete the domains (although I'd be happily told otherwise). The clock forwarding appears to have been happening for several years, so I'm assuming I can't just put the clock right (I'm guessing scope for this would be 180days, the same as the tombstone lifetime) With the replication errors would I be able to dcpromo the child domains DC, select it as the last domain controller in the domain and the child domain would be deleted? Or would I be better off treating the domain as an orphaned domain and use Microsoft's instructions to clear up as such. Any advice would be much appreciated.

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• Remote desktop type software that the client need not install anything...

  - by allentown

  I am primarily a Macintosh user, and can usually walk a client though any troubles they may have because I have a Macintosh in front of me. If they are on a different OS, things are close enough, or I cam remember, that I can get by. When trying to help clients on Windows, I get stuck. I do not have access to windows, and even if I did, there are far too many versions of Outlook, all with their various esoteric settings and checkboxes, that I could never see exactly what they are seeing. I mostly need to just help them with email setup. Something like copilot.com may do the trick. What is the simplest remote control software out there, ideally, it would accomplish these: No software needed on remote end, or, a single .exe that they can toss when done. I need Mac based software on my end. I do have ARD, which support VNC Free :) If possible, it would be really nice Needs a port forwarding proxy run by the company. There is no way I can get the user to alter their router, or to even plug directly into their WAN for a short time. On the Mac, I just have them open iChat, and this is all built in, proxying through AIM, looking for the same for Windows and Mac.

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