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• Sending an Email from 2 Mail Servers

  - by Ted Smith

  We are currently attempting to move away from using a "local" mail(exchange) server to an cloud based offering for all our automated emails. The problem is that we send and receive thousands for emails a day and its uptime is quite critical so the business do not want to put all their eggs in one basket, so if we would like to use a cloud based offering(mailgun) they would like a backup if this goes down. So my question is: Would it be possible to set multpile A, TXT and CNAME records to multiple IP address so if one mail server goes down we can automatically start sending emails from the fallover(without them being blocked doing a reverse DNS lookup)? I know we will still need to adjust the MX record for incoming emails but that is acceptable to not receive emails for a short(1-2 hours) of time. Does this make sense?

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• Which is generally considered faster or best practice: symlinks or Apache aliases?

  - by Christopher W. Allen-Poole

  I'm curious as to what most people's views are on this subject. Personally, I will almost always prefer symlinks unless I have no other option -- I find that it is far more obvious when someone is navigating the file system, but, on the other hand aliasing is more platform independent. Windows XP, for example, doesn't have anything remotely comparable to symlinks (NTFS junctions are not interpreted correctly by at least some environments), which means that anything which relies on symlinks in a *nix based system cannot be transferred. (I know that Windows 64x OS's have symlinks, but I've not seen if they can be read correctly by the environments previously mentioned) In addition to this, I was also wondering which is considered faster. Is this even possible to know? Do you have a conjecture? I would imagine that since symlinks are generally more low-level than Apache it would make sense that they would be referenced faster, but, on the other hand, I would guess that Apache is required to do a lookup in either case so it would be disk read dependent.

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• APIPA ip address in server 2003 dns for (same as parent folder record) can anyone suggest why this i

  - by dasko

  have a server 2003 domain controller i have installed active directory integrated dns under the forward lookup zone for domain_name.local i see an APIPA ip address that is set for (same as parent folder) with ip number 169.x.x.x looks like (same as parent folder) Host A 169.x.x.x (apipa subnet range) problem is, from other forums that i have read, that this is due to dual nics and one on that is not getting a dynamic or static ip address BUT... I only have one nic in this server? where could this be coming from and could it mess up other settings or not allowing the DC to be contacted? i am just wondering what symptoms could arise due to the record being there. any help would be greatly appreciated thanks.

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• Configuring subdomains for a machine (Win2k8) in a lan

  - by RMS

  I am currently setting up a windows 2008 server to host a website with multiple subdomains, all accessible only within the lan. also, there is no active directory. what I did is : 1 - computer name : 'web' 2 - in IIS, I added a site binding as 'site1.web' to the default web site 3 - added DNS role to the server 4 - added 'web' as principal zone in direct lookup zones (default options) 5 - added CNAME 'site1' From a client machine, in tcpip config I added the ip address of 'web' to the DNS list in addition to the ISP DNS. (client machine ip is from DHCP) Now browsing to 'http://web' or 'http://site1.web' works correctly. My question is, is it possible throught additional steps in the server to have the websites accessible without requiring the DNS config in all the client machines ? thanks in advance

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• multiple domains, one static IP address and latency

  - by shirish

  how is latency affected when multiple domains are using one single static IP address ? The scenario is in shared web-hosting By latency meaning the DNS lookup the client has to do. As far as I understand it, the browser would hit the root servers to try to figure out the IP Address and it belongs where and then when it comes to the correct server, it probably looks up some sort of table to determine which site names much and show that site as such via browser to the user. Is my understanding correct or backwards or what ?

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• DBD::mysql gives mysql_init not found

  - by highBandWidth

  I have to install a non-admin copy of mysql and perl module DBD::mysql in my home directory. I installed mysql in ~/software/db/mysql and this works since I can start and stop the server and go to the mysql prompt. Then, I downloaded the perl module and installed it using perl Makefile.PL PREFIX=~/myperl/ LIB=~/myperl/lib/lib64/perl5/ --mysql_config=/my_home/software/db/mysql/bin/mysql_config --libs=/myhome/software/db/mysql/lib/libmysqlclient.a make make install I did this to use the statically linked mysql client library. perl -MDBD::mysql -e 1 gives no errors. However, when I actually try to use the module, I get /usr/bin/perl: symbol lookup error: /myhome/myperl/lib/lib64/perl5/x86_64-linux-thread-multi/auto/DBD/mysql/mysql.so: undefined symbol: mysql_init

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• How do I redirect/rewrite to the FQDN URL without setting ServerName?

  - by ChaimKut

  Often in intranets, users will direct URLs to a hostname without supplying the FQDN. Example: http://internalHost Instead of http://internalHost.example.com I would like to redirect users / rewrite URLs so that everything will use the FQDN. Here's the catch: I don't want to set ServerName explicitly. (This is for a product which will be deployed in multiple intranets so we can't know the value of ServerName ahead of time). According to: http://wiki.apache.org/httpd/CouldNotDetermineServerName Apache uses a reverse lookup to determine a default FQDN. How can I make use of/reference that FQDN that Apache is using for a mod_rewrite or redirect?

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• While Mail Forwarding with exim, how do I rewrite the To header with true destination address

  - by Jom

  I have mail forwarding setup with exim using a domain forwarding file. virtual_aliases_nostar: driver = redirect allow_defer allow_fail data = ${if exists{/etc/valiases/$domain}{${lookup{$local_part@$domain}lsearch{/etc/valiases/$domain}}}} file_transport = address_file group = mail pipe_transport = virtual_address_pipe retry_use_local_part domains = lsearch;/etc/localdomains unseen It is working fine. However, I would like to rewrite the "to" header. In my system filter, I would like to put something like: headers remove to headers add "To: $recipient:" I've tried: headers remove to headers add "To: $recipient:" headers remove to headers add "To: $h_env-to:" headers remove to headers add "To: $env-to:" The intent is to have the end recipient see their own email address in the To: line of their mail client. I can't seem to figure out what the correct header is for the final destination of the email so that I can put it in the to header. I've read through the Exim docs and can't seem to find it. I've also looked in the headers in an email at a mail client and can't see it there either. Any suggestions would be appreciated.

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• Grant relay to servers based on AD security group membership

  - by john

  We're moving our relay from an Exchange 2003 server to an Exchange 2010 server. I was hoping the "Grant or deny relay permissions to specific users or groups" option would still be available in some form, but I can't find out how to do it. I've read up on recieve connectors and so far I can't get it to work. I have edited the security on the Recieve Connector to allow the following extended rights to the group and added computer accounts to that group: Accept Routing Headers Bypass Anti-spam Submit to Server Accept any Sender Accept any Recipient Then I suddenly realised while testing... How would the receive connector resolve the permission to a particular AD object, maybe a reverse DNS lookup? What I'd like to know is if what I'm trying to achieve is possible, and how it would be possible. I would rather not revert to an IP-based list as this is not as manageable, and I'm trying to avoid creating static IPs/reservations for a number of workstations that would otherwise not need them.

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• zeroconf (bonjour/avahi): macs do not see linuxes and vice versa

  - by codesnik

  In my home network I have several OS X boxes and several Ubuntu boxes. each Ubuntu box sees other boxes via zeroconf. I can "ssh ubuntu1.local" and "ping ubuntu1.local" from "ubuntu2.local", but both fail to lookup OSX boxes. and other way around, I can "ssh mini1.local" from "mbair.local". but it doesn't see "ubuntu1.local" why? do ubuntu and osx use different flavours of zeroconf? could be ubuntu, or osx tweaked to use common flavour?

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• Ubuntu 12.04 VPS doesn't boot with mysql in nsswitch.conf

  - by chrisv

  1and1 VPS ("dynamic cloud server") does not boot any more as soon as mysql lookup is enabled in nsswitch.conf - any suggestions appreciated. Minimal setup to reproduce the problem: install Ubuntu 12.04 / LTS minimal server image install mysql-server, libnss-mysql-bg, nscd configure /etc/libnss-mysql.cfg and /etc/libnss-mysql-root.cfg set up appropriate database tables configure nss lookups through mysql in nsswitch.conf passwd: compat mysql group: compat mysql shadow: compat mysql Now, when I try to reboot the server it just hangs. No logs (maybe due to /var not yet being mounted), and I can't see console output (since this is a VPS). Booting into recovery image and removing "mysql" from /etc/nsswitch.conf makes the system bootable again, so this is definitely related to nsswitch/libnss-mysql-bg. There's a thread on gentoo-users which seems to describe a similar problem, unfortunately there's no real solution described, also the thread is rather old (from 2006) so I'm not sure whether this applies to me at all.

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• Determining Namespaces Not in the ACPI Spec

  - by Eddie B

  I am trying to determine how it may be possible to find documentation for namespaces that are not documented in the ACPI spec. I have an Asus uEFI BIOS v(3202) and I'm receiving kernel messages stating AE Namespace lookup failures for DSSP. This is referring to a namespace that is not in the ACPI spec. I'm presuming that this is vendor specific and refers to a Digital Sensor Signal Processor. That is only a presumption. In an effort to correct ACPI errors I have dumped my DSDT using acpidump and then decompiled it using iASL. Yet to fix the error I need to know the spec on the namespace. How can I get access to the BIOS documentation that isn't part of the ACPI spec?

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• Is there a way i can see why Squid (Proxy Server) determines why a resources should be a MISS?

  - by Pure.Krome

  Hi folks, I'm using Fiddler/FireBug to debug some of our live server web content. We're getting a lot of :- X-Cache: MISS from X-Cache-Lookup: MISS from :8080 Via: 1.1 :8080 (squid/2.7.STABE3) I thought i knew a lot about cache-control / expires / last-modified / etags, etc.. but maybe not. So .. is there a way I can run squid in some verbose way to see why it thinks a resource which i request, is cached/is not getting cached, etc.. which is why we're getting MISSes back? cheers :)

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• Why change net.inet.tcp.tcbhashsize in FreeBSD?

  - by sh-beta

  In virtually every FreeBSD network tuning document I can find: # /boot/loader.conf net.inet.tcp.tcbhashsize=4096 This is usually paired with some unhelpful statement like "TCP control-block hash table tuning" or "Set this to a reasonable value." man 4 tcp isn't much help either: tcbhashsize Size of the TCP control-block hash table (read-only). This may be tuned using the kernel option TCBHASHSIZE or by setting net.inet.tcp.tcbhashsize in the loader(8). The only document I can find that touches on this mysterious thing is the Protocol Control Block Lookup subsection beneath Transport Layer in Optimizing the FreeBSD IP and TCP Stack, but its description is more about potential bottlenecks in using it. It seems tied to matching new TCP segments to their listening sockets, but I'm not sure how. What exactly is the TCP Control Block used for? Why would you want to set its hash size to 4096 or any other particular number?

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• Want to SASL/TLS authentication

  - by Naval

  I want to send mail from remote client from my server(centos 5 and 64 bit) for this i need to sasl auth but i have no idea about it what changes i have to make in my server and client here I want to make things more clear my server's hostname/Ip is = test02.s80.in/176.67.172.209 now i want to authenticat remote client vps2.smail.info and vps1.smail.info to deliver mail .. so plz help me if any systematic way to do sasl/tls authentication for these clients... i am using DNS load-balancing(round-robin) mx record lookup technique for load balancing..

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• Can qmail-ldap replace the validrcptto file?

  - by T. Fabre

  We are using qmail to route incoming mail to our Domino server. However, that requires us to maintain the validrcptto with the list of all allowed email addresses. Since Domino provides an LDAP directory, does qmail-ldap provide functionnality to lookup valid rcpt to addresses in the Domino directory instead of the validrcptto file, so that we wouldn't have to maintain that extra list ? We have about 150~200 users, so is setting up qmail-ldap worth the extra mile if it can verify addresses in the LDAP directory ? If anyone has experience with qmail-ldap and its setup, I'd be glad to hear from you.

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• Reverse DNS for two ADs in the same subnet

  - by SpacemanSpiff

  I currently have two separate AD forests that exist within the same subnet. The two forests have independent copies of the reverse lookup zone for that subnet. Example: Domain A DC1: 10.1.1.1/24 Domain A DC2: 10.1.1.2/24 Domain A AppServer1:10.1.1.3/24 Domain B DC1: 10.1.1.11/24 Domain B DC2: 10.1.1.12/24 Domain B Appserver1:10.1.1.13/24 What I'm after, is a configuration that allows this reverse zone to be shared between them so that both sets of DNS servers can make updates to the zone. This kind of thing is a little far from my everday work, so a kick in the right direction is a welcome suggestion as well. Decoupling one AD into new segments is a possibility I'm open to but would like to avoid if possible. If there is a DNS related solution I'd prefer that.

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• Network interface selection

  - by Antonino

  Hello. Suppose I have more than a network interfaces and I want to selectively use them per application. eth0 is the standard interface with the standard gateway in the main routing table eth1 is another interface with a different gateway. Suppose I launch an application as a user "user_eth1". I used the following set of rules for iptables / ip rules. IPTABLES: iptables -t mangle -A OUTPUT -m user --uid-owner user_eth1 -j MARK --set-mark 100 iptables -t nat -A POSTROUTING -m user -uid-owner -o eth1 user_eth1 -j SNAT --to-source <eth_ipaddress> IPRULE: ip rule add fwmark 100 lookup table100 and i build "table100" as follows (no doubts on that) ip route show table main | grep -Ev ^default | while read ROUTE; do ip route add table table100 $ROUTE; done ip route add default via <default_gateway> table table100 It doesn't work at all. What's wrong with this? Thank you in advance!

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• Best way to block a country by IP address?

  - by George Edison

  I have a website that needs to block a particular country based on IP address. I am more than aware that IP-based blocking is not a foolproof method for blocking visitors, but it is a necessary step in the right direction. Since I'm using PHP, what I would do is use a GeoIP database like geoplugin.net. However, I'm curious to know if there's a better way of doing this. The website is on a shared webserver (I don't have root access) and it is running Apache on centOS. I guess my question is "can an .htaccess file be configured to block by IP using an external source to lookup IP addresses."

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• search nfs network volume from mac client

  - by user1440190

  Asked: how does a Mac OSX SL or Lion user search the cluster for a particular file (foo.txt) "From the cluster, you would need to run some form of recursive lookup for the file desired. As an example, using 'find'. RAM-1# find /ifs |grep test.txt /ifs/Elements/avid2test.txt /ifs/Elements/test.txt I would suggest contacting Apple support regarding their recommendation for searching for files on remote file systems from the Mac client itself" OK that's great, but I don't want users using CLI !!! Anyone know a good method (non-CLI)? Spotlight is not an option. BTW cluster is roughly 80TB

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• Disable NSS LDAP IPv6 (AAAA) lookups

  - by pilcrow

  Question: How can I disable inet6 AAAA queries for my LDAP server during (LDAP-backed) NSS lookups on a CentOS (RHEL) 5 machine? Background: I've servers configured to consult ldap://ldap.internal for NSS passwd and group lookups. Every relevant NSS lookup, for example the getpwuid(3) implied by an ls -l which needs to translate UIDs to network user names, performs the following DNS dance before connecting to the ldap server: AAAA? ldap.internal -> (no records) AAAA? ldap.internal.internal -> NXDomain A? ldap.internal -> 192.168.3.89 I'd like to skip the first two queries completely. Configuration: [server]$ cat /etc/redhat-release CentOS release 5.4 (Final) [server]$ grep ^passwd /etc/nsswitch.conf passwd: files ldap [server]$ grep ^uri /etc/ldap.conf uri ldap://ldap.internal/ For what it's worth, IPv6 support is otherwise disabled on these systems: [server]$ grep off /etc/modprobe.conf alias ipv6 off alias net-pf-10 off [server]$ echo "$(ip a | grep -c inet6) IPv6-enabled interfaces" 0 IPv6-enabled interfaces

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• Windows Server 2003: Remapping external domain

  - by Chuck Harmston

  We're playing a going-away prank on a coworker, and would like to use a rule in our internal DNS server to redirect techcrunch.com to point at one of our internal development servers. Basically, I'd like to accomplish the same thing as adding a line to a Linux /etc/hosts file, only for the entire network. I have access to our DNS server. How would you go about doing this? I created an entry in the reverse lookup subnet with the 'Host Name' of techcrunch.com and the 'Host IP' of our development server, a Linux box running Debian on which I've created a virtualhost to handle requests to techcrunch.com. It doesn't appear to be working, however, and my expertise has reached its limit. Thanks!

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• incorrect DNS entries on server 2008 r2

  - by user137841

  On the main DC (windows server 2008 R2 standard) in our network I have to clear some old DNS entries every now and then in the Forward and Reverse Lookup Zones. I have set the server Aging/Scavenging settings to Scavenge stale resource records, with both the No-refresh interval and Refresh interval to 5 days. Yet every now and then I still have to logon to the sever and remove the DNS entries for computers that is not part of the domain anymore or has been renamed ect. Is there a different way to automatically remove the old entries?

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• Make BIND use DHCP DNS as backup

  - by cainmi

  I run BIND locally on my OS X machine, to enable wildcard Apache vhosts, which requires setting the DNS server for all network interfaces to 127.0.0.1. This works great, but means when I am on a network which uses an internal DNS server to route special (i.e. .companyname) URLs to a server on the network, the lookup fails. I tried adding both 127.0.0.1 and the DHCP provided DNS server, but this doesn't work either. Is there a way to make BIND use the DHCP DNS server for requests it cannot resolve locally?

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• Keyboard-Shortcut driffen Utility to move windows around on multiscreen setup

  - by Wolfgang Fahl

  I am looking for a utility to move windows around on a multiscreen (usualy dual screen) setup. So with a keybord shortcut (or mousclick) I would like to send a windows to another monitor. I am using this functionality a lot when I give presentations. I'll lookup something on my mainscreen and then send the window to the screen or beamer where others can see it. Its also useful when working or when I want to send a screen from my computer to the TV screen that is hooked up to the computer. I know two solutions for a) Windows b) Mac OS but none yet for Linux. I'll post my windows and Mac OS solutions as answer and would be interested in other opinions.

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