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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• Text template or tool for documentation of computer configurations

  - by mjustin

  I regularly write and update technical documentation which will be used to set up a new virtual machine, or to have a lookup for system dependencies in networks with around 20-50 (server-side) computers. At the moment I use OpenOffice Writer with text tables, and create one document per intranet domain. To improve this documentation, I would like to collect some examples to identify areas where my documents can be improved, regarding general structure and content, to make it easy to read and use not only for me but also for technical staff, helpdesk etc. Are there simple text templates (for example for OpenOffice Writer) or tools (maybe database-driven) for structured documentation of a computer configuration? Such a template / tool should provide required and optional configuration sections, like 'operating system', 'installed services', 'mapped network drives', 'scheduled tasks', 'remote servers', 'logon user account', 'firewall settings', 'hard disk size' ... It is not so much low-level hardware docs but more infrastructure / integration information in these documents (no BIOS settings, MAC addresses).

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• Excel: Look up function for combinations of cells in a single column

  - by Rebecca

  I'm looking to find the number of times a certain combination of values appears in a single column, I was hoping to do this in Excel but I'm starting to think it may not be possible. As an example, I have a list that looks like a longer vertical version of this: F1 F3 F2 F4 F1 F3 F4 F1 F3 F4 F1 F3 F4 And I want to know how many times a specific order (say F1 F3 F4) occurs, in this example 3 times (in my case the lookup sequences are 8 cells long). Is there a way to run over the whole column and identify the instances where this combination of cells occurs? I'm running Excel 2008 for Mac. Many thanks!

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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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• Is it possible to push DNS search suffices from DNS server to client?

  - by Mark

  Our (active directory, windows-server-based) intranet used to be called "intranet", and DNS worked fine for windows machines and iPads/Android devices. We have changed it to be "apps.intranet", and it still works for windows machines, but no longer for iPads/Android devices. I think this is because out windows clients are configured to append .company.com when searching DNS, to make it a fully qualified lookup (this search suffix list is pushed to the PCs via AD group policies). I must admit, though, I don't know why it worked with just "intranet"! Does anyone know if it's possible to get DNS to "tell" the iPads/Android devices to append .company.com ... or how we can make it work some other way (but still using the multi-label, non-qualified DNS names) ? Thanks!

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• Recovering an old website

  - by noah

  I have a client with an old website that somebody setup for him long ago. The guy who set it up is unreachable, so how do we go about trying to take it over? A WHOIS lookup got us some contact information, but I don't have great hopes for that (it hasn't been update in quite some time). The nameservers are ns1.theplanet.com and ns2.theplanet.com, and we will try calling them, but I don't expect we'll be able to get much from them. What are our options? Is there a way I can discover the registrar so we can try contacting them as well? EDIT: It would be sufficient if we could get control of the domain name or put in some sort of redirect to the new site. Either hosting was prepaid for quite some time, or someone else is still paying for it, so we don't care about that.

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• Apache on Windows random long wait times

  - by Jaxbot

  I have a development machine with Apache installed as a service on Windows. The installation is fresh out of the box, with no changes to configuration aside from adding the PHP module. From day one, I've had a problem that looks like this: Essentially, Apache is freezing for about 11 seconds before replying on random requests. This appears to happen more frequently when the host hasn't been connected to in a while, but this is not always the case. I've eliminated MySQL, PHP, and the specific application; this long wait problem will occur even when loading a static file such as favicon.ico. Thus, the only factor remaining is Apache, which is freezing for consistently around 10-11 seconds before replying. The problem is not the DNS problem that many people point to; as you can see, the DNS lookup is instant, and the problem occurs both on localhost and 127.0.0.1. Thanks for the time.

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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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• nslookup gives wrong ip for my domain

  - by Werulz

  I am having some problem in trying to setup DNS for my domain on my server. This tutorial normally works fine for me but when i tried to lookup my domain it gives the following output Server: 4.2.2.1 Address: 4.2.2.1#53 Non-authoritative answer: 119.100.79.64.in-addr.arpa name = server.leech4ever.com. Authoritative answers can be found from: The server and the address are wrong according to the tutorial Here is tutorial http://webcache.googleusercontent.com/search?q=cache:rR7Z4YU4GI0J:www.broexperts.com/2012/03/linux-dns-bind-configuration-on-centos-6-2/+broexperts+bind&cd=1&hl=en&ct=clnk&gl=mu /etc/hosts 127.0.0.1 localhost 64.79.100.119 server.leech4ever.com server /etc/resolve.conf search leech4ever.com nameserver 64.79.100.119 /etc/resolv.conf nameserver 4.2.2.1 nameserver 4.2.2.2 How to solve this problem guys.....The tutorial was flawless until i did a server restore

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• Microsoft DNS Server (Windows 2008) CNAME issue

  - by Lukes123

  I am using the DNS role in Windows Server 2008 R2. I have my records set up correctly with the following CNAMEs: {removed domain names for security} Currently, only the 'wsp' cname works. All the records are identically set up. I have checked with a DNS checker, and the other two CNAMEs do not resolve to anything. I have tried restarting the server, re-creating the forward lookup zone. Can anyone see what is wrong? 'A' records work fine when set.

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• Control cell reference increment when dragging a forumula in Libre Office Calc (3.5)

  - by Chuck

  Using Libre Office Calc (3.5) and have a question. When copying a formula that references cells into multiple empty cells the default is to increment each cell reference by one column or row, depending on the direction that the formula is being drug. A formula '= 1 + A1' drug horizontally changes to '= 1 + B1' when pulled one cell to right and '=1 + A2' when pulled one cell down. Is there a way to control increase the increment of the referenced cell? Is is possible to have a formula '= 1 + A1' that effectively changes to '= 1 + A3' when drug down one cell, '= 1 + A5' when drug down two cells, etc? If it matters, I am trying to take a constantly updating master list of data that is organized by dates (Wednesdays and Saturdays) and create separate spread sheets for each day of the week that can be updated by only pulling down the formula into the next cell. My attempts at using the 'lookup' function, 'offset' function, and creating a sort column in Libre Office Calc are thwarted by my inability to figure out how to get around the single step increment when pulling a formula down into the next cell. Thanks

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• Is a Hostname A Entry necessary?

  - by Citizen

  When I log into WHM, I get this message: The server was unable to lookup an an A entry for its hostname (server226.taxi.com). This is generally because the entry was never added. However this could also be the result of your nameserver(s) being down. If you would like to attempt to automatically add the entry, click here. If I click "here" it does nothing and I still get the message. I'm not hosting websites for other people, just internal projects on our server. Does not having an A Hostname Record affect SEO or anything like that or is this just a convenience when setting up nameservers or something like that?

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• Url for search withing Exchange Server OWA

  - by Martin Vobr

  I can easily create url for searching the Internet for specific term: http://www.bing.com/search?q=example Is is possible to create a similar url for searching my Exchange server mailbox using Outlook Web App? Something like: http://my.exchange.server.tld/owa/search.aspx?q=example EDIT Some of comments asked for target, so here is the clarification: There is a web-based backoffice system which includes customer's email addresses. I want to provide an easy way to show emails related to this customer in a support mailbox. Adding a link to an OWA search result page seemed a way to accomplish quickly. I can lookup emails either via EWS or IMAP. I wanted to reuse OWA for displaying them instead of reinventing the wheel. If creating a search link is not possible what would be best alternative approach? I'm thinking about getting message list via EWS/IMAP, showing them and (at least now) redirecting to OWA in order to display the message content.

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• Allowing users to use their domain name to their profile?

  - by cappuccino

  I have a web site / app where each user as a profile i.e.: mydomain.com/user1 mydomain.com/user2 mydomain.com/user3 etc How do I allow it so that a user can use their own domain name to go to their profile as a rewrite not a redirect. So when they go to lets say: user1theirdomain.com they see there profile at mydomain.com/user1, but I don't want a redirect, I want it so their domain is seen in the address bar. I imagine the user will need to adjust there domain name DNS to point to my server, what are the correct procedures and what would I need to do from there? Also I wouldn't want to manually adjust things, I'd like it so when they point their domain to my server, my app will check the domain name, lookup the domain in my database and then serve the correct content. Any ideas?

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• nslookup returning different results

  - by Sterno

  I'm having a problem with my machine. A site that I used to be able to access is no longer being found. After running nslookup, I notice that about 9 times out of 10 it returns a specific IP which times out if I ping it, but about 1 in 10 times it returns a different IP which works when I ping it. I've even tried adding an option parameter into nslookup to hit different DNS servers (such as Google's public DNS) and am getting the same result. Any idea what would cause the IP returned by DNS lookup to change back and forth like that?

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