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• Migrate openldap users and groups

  - by user53864

  I have an OpenLDAP server running on one of my ubuntu 8.10 servers. I used command-line only for OpenLdap installation and some basic configurations, everything else I'll configure with the Webmin gui tool. I'm trying to migrate to ubuntu 10.04 and I was able to migrate all other servies, application and databases but not the ldap. I'm an ldap beginner: I have installed OpenLDAP server and client on ubuntu 10.04 server using the link and used the following command to export and import ldap users and groups To export from 8.10 server slapcat > ldap.ldif To import to 10.04 server Stop ldap and slapadd -l ldap.ldif and Start ldap Then I accessed Webmin and checked in Ldap users and groups and I could see all the users and groups of my old ldap server.Whenever I create an ldap user from the webmin(in 8.10 or 10.04) a unix user is also created with the home directory under /home. But the imported users in 10.04 from 8.10 are not present as a unix user(/etc/passwd). How could I make the ldap users available as a unix user, is there any perfect way to export and import?. I also wanted to check the ldap users from the terminal that if password is exported properly but I don't know how to access the ldap users which are not available as unix users. On 8.10, I just use su - ldapuser and it is not working in the 10.04 as unix users are not created for the exported ldap users. If every thing works fine then the CVS works as it is using ldap authentication. Anybody could help me?

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• VirtualBox VM running web server not accessible via external IP

  - by mwigdahl

  I have a Windows 7 machine running VirtualBox with an Ubuntu guest. The guest has a Bitnami LAMP stack installed. I have the guest configured for Bridged networking, and I can access the guest web server just fine from other machines on my LAN using the guest's IP. I'm trying to configure port forwarding so that I can access the web server from outside my LAN. (The router is a 2WIRE model as I'm on ATT's UVerse). I've set up port forwarding for ports 80 and 443 to the guest's IP in a similar manner to how I had them set up for my previous, physical web server, which worked just fine. However, I cannot seem to access the new, virtual web server using my external IP on the forwarded port. I suspected Windows Firewall issues on the host, but disabling it didn't solve the issue. Anyone have advice on what I should try next? EDIT: I've now attempted disabling the firewall on the guest with sudo ufw disable -- that doesn't seem to help either. However, after checking the router's port forwarding in more detail I may see the problem. My VM is named "linux" and in the router's configuration pages it shows up inconsistently. Sometimes it reports with a valid LAN IP and other times it doesn't show up with any IP. Even when it shows the correct IP the router indicates that it is disconnected. Could this be an indication that the 2WIRE router doesn't play well with VirtualBox's bridged networking mode?

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• Unable to get ejabberd prebind to work

  - by cdecker

  I'm trying to get the prebind of BOSH sessions to work. I want to be able to authenticate a user in my CMS and then log him in when he accesses the chat, for this I found https://github.com/smokeclouds/http_prebind, it all works find and I was able to compile it with the following steps: rake configure sed -i 's/AUTH_USER/a_user/g' src/http_prebind.erl sed -i 's/AUTH_PASSWORD/a_password/g' src/http_prebind.erl sed -i 's/EJABBERD_DOMAIN/jabber.my.tld/g' src/http_prebind.erl rake build rake install And then adding the http request bindings to the configuration: {5280, ejabberd_http, [ {request_handlers, [ {["http-prebind"], http_prebind} ]}, %%captcha, http_bind, http_poll, http_prebind, web_admin ]} ]}. As far as I understand it I should now be able to simply request a new session like this: curl -u a_user:a_password http://jabber.my.tld:5280/http-prebind/some_user But no matter what I always get Unauthorized as response. Any idea about this one? PS: I also tried Mod-Http-Pre-Bind, but as it does not require a password I would prefer to use http_prebind. PPS: Does the user with username AUTH_USER and password AUTH_PASSWORD actually have to exist? I'm currently using an admin account.

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• Windows 7, Printer is unavailable until PC reboot

  - by Cjs

  We are having a problem that I haven't seen before and can find no answers to online. A desktop running Windows 7 is unable to print using network printers. When the user tries, no matter what printer it is, he get's the following message when using Microsoft Office applications: "Current printer is unavailable. Select another printer." When the end user uses Outlook we get the message: "Printing is not available. There are no printers installed. You can select and configure a printer in Windows Control Panel." Now here is the confusing part, if we reboot the pc it works fine for a little while and then goes back to the same old same old. The printers are working fine for every other user as well so I believe it is the user's machine. If anyone has any ideas please let me know. Edit: I'd like to add in that some people were having luck disabling snmp for the printers. Restarting the print spooler doesn't seem to do anything.

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• DNS Issue- Nameserver Issue

  - by Master-Man

  I setup new server on centos 5.3 and configure dns and hostnam using WHM. I also register my new nameservers with my domain registrar with ns1.example.com and ns2.example.com. But i am unable to ping hostname and NS. ping pc2.example.com or ping ns1.example.com I received the below email from server. IMPORTANT: Do not ignore this email. Your hostname (pc2.example.com) could not be resolved to an IP address. This means that /etc/hosts is not set up correctly, and/or there is no dns entry for pc2.example.com. Please be sure that the contents of /etc/hosts are configured correctly, and also that there is a correct 'A' entry for the domain in the zone file. Some or all of these problems can be caused by /etc/resolv.conf being setup incorrectly. Please check that file if you believe everything else is correct. You may be able to automatically correct this problem by using the 'Add an A entry for your hostname' option under 'Dns Functions' in your Web Host Manager. When I issue the command root@pc[~]# host pc2.example.com I receive the below error that Host pc2.example.com not found: 3(NXDOMAIN) I added A entries for hostname and Nameservers but nothing replies. Its almost more than 72 hours for setting & registering nameservers and dns configurations. thanks,

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• Shared configuration for Eclipse on Debian server

  - by Joris Meys

  I've manually installed the latest Eclipse on our debian server and wanted to configure it so all users share the same configuration. It turned out less obvious than I thought: I don't seem to be able to install packages for all users. If I run it myself, all configuration data is saved under my own home directory. If I run Eclipse using sudo, everything is saved under the root directory but is not accessible for other users when they run Eclipse. I've been browsing the manual of Eclipse and some forums, but apart from a "yes, you can" I couldn't find any information on how that should be done. The biggest problem is installing plugins for all users to be found. Any help is greatly appreciated. Eclipse : 3.6.1 classic, installed using this procedure. Server uname: GNU/Linux * 2.6.26-2-amd64 Server is accessed using Putty, and Gnome desktop through realVNC. Just mentioning it if that is of any importance. Our sysadmin is on "prolonged leave" (working in Spain and never replaced), so I'm stuck without help here. EDIT : -- I asked this question also on StackOverflow as I wasn't certain this is a genuine server-related question. Please feel free to merge both questions at the appropriate place. --

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• OpenVZ with bridged interfaces and VLAN

  - by Deimosfr

  Hi, I've got a problem with OpenVZ with bridged VLAN. Here is my configuration: +------+ +-------+ +-----------+ +---------+ br0 |VE101 | | | | OpenBSD |----->| Debian |------->| | | WAN |--->| Router | | OpenVZ | +------+ | | | Firewall |----->| br0 br1 | br1 +------+ +-------+ +-----------+ +---------+------->|VE102 | |br0 | | |VLAN br0.110 +------+ v +---------+ |VE103.110| +---------+ I can't make VLAN work on br0 (br0.110) and I would like to understand why. I don't have any switch so no problem with unmanageable switch. I've configured a VLAN interface on OpenBSD in /etc/hostname.vlan110: inet 192.168.110.254 255.255.255.0 NONE vlan 110 vlandev sis1 And it seems to be working fine. I've also adapted my PF configuration to work with VLAN but I don't see any incoming traffic. On my Debian Lenny, here is my interfaces configuration : # The loopback network interface auto lo iface lo inet loopback # br0 auto br0 iface br0 inet static address 192.168.100.1 netmask 255.255.255.0 gateway 192.168.100.254 network 192.168.100.0 broadcast 192.168.100.255 bridge_ports eth0 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off # VLAN 110 auto br0.110 iface br0.110 inet static address 192.168.110.1 netmask 255.255.255.0 network 192.168.110.0 gateway 192.168.110.254 broadcast 192.168.110.255 pre-up vconfig add br0 110 post-down vconfig rem br0.110 It looks OK, but when I start my VE, here is the message: ... Configure veth devices: veth103.0 Adding interface veth103.0 to bridge br0.110 on CT0 for VE103 can't add veth103.0 to bridge br0.110: Operation not supported VE start in progress... So I've got one error here. I've followed this documentation http://wiki.openvz.org/VLAN but it doesn't work. I've certainly missed something but I don't know why. Someone could help me please? Thanks

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• Setup proxy with Apache 2.4 on Mac 10.8

  - by Aptos

  I have 1 application (Java) that running on my local machine (localhost:9000). I want to setup Apache as a front end proxy thus I used following configuration in the httpd.conf: <Directory /> #Options FollowSymLinks Options Indexes FollowSymLinks Includes ExecCGI AllowOverride All Order deny,allow Allow from all </Directory> Listen 57173 LoadModule proxy_module modules/mod_proxy.so <VirtualHost *:9999> ProxyPreserveHost On ServerName project.play ProxyPass / http://127.0.0.1:9000/Login ProxyPassReverse / http://127.0.0.1:9000/Login LogLevel debug </VirtualHost> ServerName localhost:57173 I change my vim /private/etc/hosts to: ## # Host Database # # localhost is used to configure the loopback interface # when the system is booting. Do not change this entry. ## 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost 127.0.0.1:9999 project.play and use dscacheutil -flushcache. The problem is that I can only access to localhost:57173, when I tried accessing http://project.play:9999, Chrome returns "Oops! Google Chrome could not find project.play:9999". Can somebody show me where I were wrong? Thank you very much P/S: When accessing localhost:9999 it returns The server made a boo boo.

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• Tools to manage sql 2008 database mirroring?

  - by lemkepf

  We are going to be moving about 20 databases that live on a single instance of sql 2000 to a sql 2008 r2 environment with database mirroring. What I'm looking for is a tool or scripts that will help me manage the conversion and management of those 20db's onto this new mirrored environment easily. There are many steps in setting each DB up and I want to automate as much as possible. Edit: Here are the steps I've been doing manually: Create the same username/passwords from the old sql 2000 server onto new sql 2008 server. Then sync those users/passwords onto the other sql 2008 server with the same SSID's so when we do the db backup and restore they match up. Take a backup of each sql 2000 db's. Copy them to server A. Restore the backup to server A. Backup from server a, copy to server b, restore there. Run the mirror "configure security" wizard. Start mirroring. I've love to be able to script this out or have a tool that does it for me. Thanks! Paul

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• Overscan in Catalyst Control Center

  - by alex

  I've connected my PC to my TV via HDMI (I've also tried using DVI). Whatever the resolution (anything from 800 x 600 to 1080p), the image displayed on the TV does not fill the entire screen surface; there's a black border on the edge of the image. This happens in both Vista and Windows 7. After a bit of searching I came to the conclusion it's got something to do with overscan done by the graphics card (ATI 3200HD). It's definitely not the TV because on my old PC there were no such problems. I've searched for the option in Catalyst Control Center 9.9 but it's not available for the TV; if I connect a normal LCD display, the option is there, but only for the LCD screen. If I choose Configure for my TV, where the overscan option should be, it takes me to the Welcome tab in CCC. How can I make the image fill the entire screen? How can I enable/disable overscan for my TV?

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• Debian Stable: Can't update kernel, libc won't update.

  - by pascal

  I use Debian Stable (squeeze) on a virtual host where I can't touch the kernel, it's stuck (and will be for some time as support told me) at Linux 2.6.18-028stab070.3 #1 SMP Wed Jul 21 18:33:27 MSD 2010 x86_64 So when I try to update, several packages fail with FATAL: kernel too old for example Preparing to replace libgcc1 1:4.6.0-11 (using .../libgcc1_1%3a4.6.1-1_amd64.deb) ... Unpacking replacement libgcc1 ... Setting up libgcc1 (1:4.6.1-1) ... FATAL: kernel too old Segmentation fault dpkg: error processing libgcc1 (--configure): subprocess installed post-installation script returned error exit status 139 and some version chaos ensued: The following packages have unmet dependencies: libc-dev-bin : Depends: libc6 (> 2.13) but 2.11.2-13 is installed libc6 : Depends: libc-bin (= 2.11.2-13) but 2.13-5 is installed libc6-dev : Depends: libc6 (= 2.13-5) but 2.11.2-13 is installed libquadmath0 : Depends: gcc-4.6-base (= 4.6.0-2) but 4.6.0-11 is installed libstdc++6 : Depends: gcc-4.6-base (= 4.6.0-2) but 4.6.0-11 is installed locales : Depends: glibc-2.13-1 What should I do? I want to keep the system up-to-date, so I want to pin as few packets as possible, but I also don't want to have to compile anything manually. Trying to pin the status quo and figured out where the error came from: ldconfig segfaults. -v doesn't print anything more so I can't tell what's the actual problem. # ldconfig FATAL: kernel too old

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• Why is it necessary to chmod o+r parent directory to fix 403 access forbidden error with Nginx and P

  - by davenolan

  This may be an Nginx wrinkle, or it may be because I don't understand Unix permissions. We're using Hudson CI to deploy our staging instance. So RAILS_ROOT is /var/lib/hudson/jobs/JOBNAME/workspace. Hudson runs as hudson user Nginx runs as www-data user hudson and nginx are both members of the www group root of my nginx conf points to RAILS_ROOT/public as per normal. RAILS_ROOT/config/environment.rb is owned by www-data (so Passenger runs as www-data) RAILS_ROOT and everything in it is owned by the www group and group has r/w/x permissions As it stood, Nginx threw 403 permission denied when requesting any url. error.log contained entries like this: public/index.html" is forbidden (13: Permission denied). These did not fix the or change the error (each with a stop/start of Ngnix): chmod 777 -R RAILS_ROOT chgrp www -R /var/lib/hudson I also tried Nginx as root, and passenger complained that it could not find config/environment (despite the path displayed on the error page being correct). The fix was to ensure everybody has read permissions on each directory in the heirachy. In this case chmod o+r /var/lib/hudson. But if the group has read permissions on the directory, and nginx is a member of the owner group of the directory, why was it necessary to allow everyone read permissions? Is there something have not grokked about permissions? $nginx -V nginx version: nginx/0.7.61 built by gcc 4.4.1 (Ubuntu 4.4.1-4ubuntu8) configure arguments: --prefix=/opt/nginx --add-module=/usr/lib/ruby/gems/1.8/gems/passenger-2.2.5/ext/nginx --with-http_ssl_module --with-pcre=~/src/pcre-8.00/ --with-http_stub_status_module $cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=9.10 DISTRIB_CODENAME=karmic DISTRIB_DESCRIPTION="Ubuntu 9.10"

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• How to place a virtual machine in DMZ?

  - by Giordano

  I have an Ubuntu 12.04 server running few virtual machines with KVM. I would like to expose some of these virtual machines on the internet, to make it possible for customers to test the products we're developing and make available other products for demo purposes. One of the server NICs is configured with a public IP. However before exposing anything on the web I would like to be sure that if one of the virtual machines get compromised, the attacker doesn't reach the rest of the hosts. What I would like to do is to put these virtual machines into a DMZ. These are the steps I'm planning to do: Create a tap interface in the virtualization host (let's say tap1) Create a bridge using tap1 and give it an IP in a subnet separate from the other hosts. Let's say 10.0.0.1 Attach the DMZ virtual machines to the bridge and configure their IP statically (10.0.0.2, 10.0.0.3, etc...) Using UFW, forbid any traffic from 10.0.0.0/24 to any of the internal hosts, allow the traffic from the internal hosts towards 10.0.0.0/24 and expose the virtual machines on the web using port forwarding. Do you think this setup is safe? Can you suggest any improvement or a better/safer approach? Thanks in advance!

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• Use WSUS without client configuration

  - by sc911

  Hello *, is there any way to let client-PCs use the local WSUS-server without having to configure them? What we need is a system to update PCs before they are delivered to the users. So the WSUS-server is accessible only within our lab, not later on at the users place. We'd like to use WSUS because it will fasten up the download very much. And we don't like to modify the clients as those changes might be forgotten to remove and then at the users place no update will be possible. So the easiest way would be, if one could redirect the normal Microsoft update, but I'm pretty sure that this will not be possible as this update will not be WSUS compliant. An other option I thought of might be, that the DHCP delivers an extra option telling the clients where to get the updates. But I could not find any information about this, so it looks like that this isn't possible too. So, is there any way? Or will it be easier to use a little script to change the WSUS-entries automatically? Regards sc911

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• How to reject messages to unknown user in sendmail cooperating with MS-Exchange?

  - by user71061

  Hi! I have an MS Exchange 2003 configured as a mail server for an organization. As this server is located in this organization internal network and I don't want to expose it directly over internet, I have second server - linux box with sendmail - configured as intelligent relay (it accept all messages from internet addressed to @my_domain, and forward it to internal Exchange serwer, and accepts all messages from this internal Exchange server and forward it over internet). This configuration work's fine, but I want to eliminate messages addressed to not exiting users as early as possible. Good solution could be Enabling on Exchange server function of filtering recipients together with "tar pitting", but in my case this dosn't solve problem, because before any message reach my Exchange server (which could eventually reject it), it has to be already accepted by sendmail server, sitting in front of this Exchange server. So, I want to configure my sendmail server in such a way, that during initial SMTP conversation it could query somehow my Exchange server checking whether recipient address is valid or not, and based on result of this query, accept or reject (possibly with some delay) incoming message in a very early phase. In fact, I have already solved this issue by writing my own, simple sendmail milter program which checks recipient address against text file with list of valid addresses. But this solution is not satisfying me any longer, because it requires frequent updates of this file, and due to lack of time/motivation/programming skills, I don't want to cope further with my source code, adding to it functionality of querying my Exchange server. Maybe I can achieve desired effect by configuring any component of already available linux software. Any ideas?

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• Windows 7 ssh file server.

  - by Siriss

  Hello all- I have looked at the other posts, but have not quite found an answer I have a question about windows file sharing over SSH. I have copssh installed and it is working for Remote desktop connections. I have port 22 forwarded on my router etc. I connect from a Mac or Putty with this address: ssh -l copsshusername 3391:localhost:3389 [external ip] That works fine. I would like to configure Windows 7 to allow my ssh account that I use to login, access to certain shared folders. I have documents and videos and things that I would like to be able to download externally. I have done this before on Linux and a long time ago on XP, but I cannot figure out what I am missing on Windows 7. There is a designated SSH user that copssh uses to run the service and that I use to to login as. I have googled and googled and have not found a solution that does everything I need that is why I am turning here for ideas. I hope I am explaining this correctly. Thank you very much for your help!

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• Problem with Outlook 2010 (SMTP AUTH LOGIN)

  - by Filipe YaBa Polido

  **IGNORE THIS QUESTION - SOLVED WITH A PYTHON SCRIPT available at: http://yabahaus.blogspot.com I have to connect one customer Outlook 2010 to a remote server on which I have either no right, neither way to talk to the sysadmin. This is the thing, after installing and reviewing the logs on Wireshark: Outlook Express: HELO machine AUTH LOGIN username base64 encoded password base64 encoded mails go through. Outlook 2010: HELO machine AUTH DIGEST-MD5 response from server Outlook sends just a * AUTH LOGIN password base64 encoded So... I can send mails in the same domain, but can't send outside, it gives me a relay denied message. My point is... Why the h**l Outlook 2010 doesn't send the username AND the password?! It can never login the right way :| With other versions of Outlook it works fine, and with OE works great, it auths and allows to send mail to a different domain. I've googled and nothing worked. I'm pretty sure that I'm not alone with this one. My last resort will be to configure a local proxy/server that relays to the original one :| Any help would be appreciated. Sorry my bad english as is not my natural language. Thanks.

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• Virtualizing an Inline network appliance with VirtualBox (or VMWare)

  - by Tzury Bar Yochay

  My device, which is a Linux based IP in-liner is transparent to the network peripherals, that is, no IP address assigned to any of its interfaces. For the sake of the conversation, let's use ADSL connection as an example, while the device is inspecting the bi-directional traffic, the network is behaving same as if device was not there, attached to the wire (see Physical setup at the attached diagram). I wonder if I can enclosed that "device" within a Windows machine and have it operated virtually so it still seats inline between the ADSL router and the Windows netwroking interface by using virtual NICs, (or whatever their name is in windows), and inspecting the traffic, same as if it was on a separate physical device, the drawing under "Virtual Setup" in the attached diagram show what I am trying to achieve. Reading a bit on the VirtualBox docs, seems like binding the right side is relatively simple, perhaps I should have one network adapter set as Bridge Networking and VirtualBox will connect it to the physical NIC on the host machine, and network packets are exchanged directly, circumventing the host operating system's network stack (WinXP in my case). However, I have no idea how to achieve the left side of my diagram, which requires adding virtual NICs to windows and configure them correctly in a way to make that pipeline possible. I would appreciate any help. by the way, if that is not possible with VirtualBox but with other virtualization solution (e.g. VMWare), I would accept the other as well.

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• Can't find gnutls ibrary when executing rpmbuild under non-root

  - by Rilindo

  I am trying to build ntgs from the latest source, using the .spec from rpmforge - as non-root via rpmbuild. During the compile, it fails at this step: checking for GNUTLS... no configure: error: ntfsprogs crypto code requires the gnutls library. error: Bad exit status from /var/tmp/rpm-tmp.78913 (%build) However, I can compile it successfully outside of rpmbuild. So it sounds like it just the matter of library being seen during the build. However, I can confirm that rpmbuild can see the library that gnutls resides: [foo@bar ~]$ rpmbuild -E '%{_libdir}' rpmbuild/SPECS/ntfsprogs.spec /usr/lib Library location: [foo@bar ntfs-3g_ntfsprogs-2012.1.15]$ /sbin/ldconfig -p | grep -i gnutls libgnutls.so.13 (libc6) => /usr/lib/libgnutls.so.13 libgnutls.so (libc6) => /usr/lib/libgnutls.so libgnutls-openssl.so.13 (libc6) => /usr/lib/libgnutls-openssl.so.13 libgnutls-openssl.so (libc6) => /usr/lib/libgnutls-openssl.so libgnutls-extra.so.13 (libc6) => /usr/lib/libgnutls-extra.so.13 libgnutls-extra.so (libc6) => /usr/lib/libgnutls-extra.so What would cause the problem of the library not being seen when you build a RPM? EDIT: Oh yeah, I am running Centos 5.5.

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• Windows Server 2012 Hyper-V very slow

  - by Matt Taylor

  I have been running several Hyper-V VMs on Windows Server 2008 R2 for the past couple of years and enjoying perfectly adequate performance for my testing/development/r&d environments. I'm a software developer so my hardware knowledge is basic however I built the rig using: •Gigabyte GA-X58A-UD3R Intel X58 (Socket 1366) DDR3 Motherboard •Intel Core i7 960 3.20GHz (Bloomfield) (Socket LGA1366) •24GB triple channel RAM The host OS is running on an OCZ SSD and all the VMs are running on a 2TB Marvell SATA3 RAID 0 array consisting of 2 Western Digital Caviar Black 7,200rpm drives. I have tested the speed of the 2TB drive and appear to be getting less than 3Mbs but it can adequately run a 4 VM farm including a DC, (SQL) database and IIS application servers. I recently upgraded the SSD on which the host runs to a 256GB OCZ Vertex 4 and took the opportunity to upgrade to Windows Server 2012 and installed the Hyper-V role. I tried importing one of my existing Windows Server 2008 R2 VMs (and converted it to .vhdx) plus I have tried creating a brand new Windows Server 2008 R2 VM but both are running extremely slowly and I can see nothing obvious using the host and guest Task Manager/Resource Monitor tools. In both cases the VM has 8GB RAM (fixed), 4 CPUs, fixed size HD (not expanding) and is using an external virtual network running on a separate NIC to the host. I have upgraded the BIOS to the latest available version and checked the virtualization settings. I have run out of "obvious" (to a developer) things to check/configure and my next option will be to re-install the host OS but before I do I would very much appreciate any advice from any experts out there. Thanks

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• Block SMTP session with sender domain which doesn't itself accept SMTP connection.

  - by bignose

  I'm administrating a mail service for a small business. Their mail host's internet connection is an ADSL service with a permanent IP address. Unfortunately, many misconfigured mail systems will happily deliver to this host, but, when the host attempts to send mail back (e.g. a bounce notice, or a normal response from someone), the declared sender's domain has an MX which refuses to receive connections from this host. That misconfiguration makes their system a one-way mail sender, which is a problem. How can I configure Postfix on this customer's mail host to refuse SMTP sessions that declare a sender domain which itself refuses SMTP from this host? That is, if the SMTP client declares a domain that we can't make SMTP connections back to, then there's not much point accepting the incoming connection in the first place. Note that I'm not, as some commenters have assumed, talking about checking whether the SMTP client will receive messages. The check I want is whether the declared sender's domain (regardless of who the current SMTP client is) will accept SMTP connections from here. In other words: when we get around to sending a message back, we'll need the sender's domain to accept SMTP connections; I want to do that check before accepting the incoming session. I'm imagining a late check (after the low-cost checks to winnow most of the rubbish connections) that keeps the client on the other end while it attempts an SMTP client connection back to the declared domain of the sender. If that connection is rejected, the incoming one is also rejected. I'm also open to other suggestions for how this problem might be addressed (short of not using this mail host at all, which isn't an option).

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• Postfix "mail-to-script" pipe only delivers empty messages

  - by user68202

  i have a problem here. I want that a incoming email is piped to a php script in the system through postfix. My System is running with ispconfig 3, postfix and dovecot (< virtual mailbox users are saved in mysql). I looked already into this one: How to configure postfix to pipe all incoming email to a script? ... the script is executed, but no "message" is delivered to the script. My setup so far: In ISPConfig 3 i have set up the following email route: Active Server Domain Transport Sort by Yes example.com pipe.example.com piper: 5 excerpt from my postfix master.cf: piper unix - n n - - pipe user=piper:piper directory=/home/piper argv=php -q /home/piper/mail.php so far it is working great (mail sent to [email protected]) (mail.log): Jun 21 16:07:11 example postfix/pipe[10948]: 235CF7613E2: to=<[email protected]>, relay=piper, delay=0.04, delays=0.01/0.01/0/0.02, dsn=2.0.0, status=sent (delivered via piper service) ... and no errors in mail.err the mail.php is sucessfully executed (its chmod 777 and chown'ed to piper), but creates a empty .txt file (normally it should contain the email message): -rw------- 1 piper piper 0 Jun 21 16:07 mailtext_1340287631.txt the mail.php script ive used, is the one from http://www.email2php.com/HowItWorks if i use their (commercial) service to pipe an email to the mail.php (in a apache2 environment) through a provided "pipe-email", the message is saved sucessfully and complete. But as you can see, i dont want to use external services. -rw-r--r-- 1 web2 client0 1959 Jun 21 16:19 mailtext_1340288377.txt So, whats wrong here? I think it has something to do with the "delivering configuration" in my system...

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• Ubuntu 10.04->10.10 in failed state - how to recover?

  - by Harvey

  I was running Ubuntu 10.04 and attempted to upgrade to 10.10. I have a really slow connection (DSL 128kbits/sec) and copying the upgrade files took about 26 hours. I of course let it run unattended. When I came back, I notice the following 3 dlgs: (1) "Could not install the upgrades The upgrade has aborted. Your system could be in an unusable state. A recovery will run now (dpkg -- configure -a)." (2) "gpk-update-icon Distribution upgrades available maverick 10.10 (stable) [more information] [Do no show this again] [Cancel] [Ok]" (3) "gpk-update-icon Security updates available The following important updates are available for your computer: libwebkit-1.0-2-dbg - Web content engine library for Gtk+ - Debugging symbols libcupsimage2 - Common UNIX Printing System(tm) - Raster image library ..." What is the best response to all of this? I went through something similar in an attempted network upgrade from 8.04 to 10.04 and had to reload the unbootable machine fresh from distribution media (all data was lost). I'd like to avoid that here. I have not yet responded to the dialogs, and want to make sure the system is still bootable and not lose my data this time.

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• Tomato/DD-WRT router to act as switch & only NAT some port

  - by fseto

  BACKGROUND: I have a device that must use a real IP address. Currently, my ISP uses DHCP and I can have up to 4 real IP address assigned. However, the cable modem only have 1 ethernet port and it's connected to my router (running Tomato, but can run DD-wrt or other Openwrt if required). Question stems from how I can connect the additional device, requiring a real IP? EASY SOLUTION: would be to get a switch and connect to the CM, Router, and Device. But alas, I want to avoid this route, since: my wiring cabinet in my home is drawing lots of power and heat already Device will be unprotected by any firewall unable to monitor the traffic to/from device. Besides, what would be the FUN in that? =) IDEA: So what I want to do is to configure the router, so that one of the switchport is removed from the normal br0 bridge. Instead, I want to make it behave like a switch on the WAN port. What's the best way of doing this? Should I create another bridge on the WAN & the device port? Can a single port belongs to two bridges? or would I need to create a subinterface first? Would I need a DHCP-relay? Am I expecting too much from my poor cheapie router? +------+ | CM | +--++--+ || +----WAN---------------+ | / \ Router | | BR1? BR0 | | | \ | | | {NAT} | | | / | | \ | +-P0----P1-P2-P3-Wifi--+ | +------+ |Device| +------+

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• VLAN for WiFi traffic separation (new to VLANing)

  - by Philip

  I run a school network with switches in different departments. All is routed through to a central switch to access the servers. I would like to install WiFi access points in the different departments and have this routed through the firewall (an Untangle box that can captive-portal the traffic, to provide authentication) before it gets onto the LAN or to the Internet. I know that the ports that the APs connect to on the relevant switches need to be set to a different VLAN. My question is how do I configure these ports. Which are tagged? Which are untagged? I obviously don't want to interrupt normal network traffic. Am I correct in saying: The majority of the ports should be UNTAGGED VLAN 1? Those that have WiFi APs attached should be UNTAGGED VLAN 2 (only) The uplinks to the central switch should be TAGGED VLAN 1 and TAGGED VLAN 2 The central switch's incoming ports from the outlying switches should also be TAGGED VLAN 1 and TAGGED VLAN 2 There will be two links to the firewall (each on its own NIC), one UNTAGGED VLAN 1 (for normal internet access traffic) and one UNTAGGED VLAN 2 (for captive portal authentication). This does mean that all wireless traffic will be routed over a single NIC which will also up the workload for the firewall. At this stage, I'm not concerned about that load.

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