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• Android openvpn + zeroconf browser sending mdns query packets over eth0 instead of tap0 interface on wifi

  - by Mrunal

  On an android device, I am connecting to a remote network using openvpn for performing service discovery. WORKING CASE: After the device is camped on 3g/4g and after connecting to remote network by openvpn, when the zeroconf browser is launched, I can see the mdns query packets being send through the tap0 interface resulting into rendering of services on the browser. From the tcpdump captured on the device, I can see that the mdns query packets are send to tap0 interface. tap0 ip: 192.168.11.200 Route table information: Destination Gateway Genmask Flags Metric Ref Use Iface 76.26.112.234 10.179.240.1 255.255.255.255 UGH 0 0 0 pdpbr1 10.179.240.1 * 255.255.255.255 UH 0 0 0 pdpbr1 32.1.72.136 * 255.255.255.255 UH 0 0 0 pdpbr0 10.179.240.0 * 255.255.255.0 U 0 0 0 pdpbr1 192.168.11.0 * 255.255.255.0 U 0 0 0 tap0 default 192.168.11.1 0.0.0.0 UG 0 0 0 tap0 NOT WORKING CASE: However, after switching on the wifi and connecting it to remote network, when the zeroconf browser is launched, instead of sending the mdns query packets to tap0 interface; these packets are being send to eth0 interface due to which we cannot see the services. From the tcpdump captured on the device, I can see that mdns query packets are send to eth0 interface. tap0 ip: 192.168.11.200 eth0 ip: 192.168.43.230 route table information: Destination Gateway Genmask Flags Metric Ref Use Iface 76.26.112.234 192.168.43.1 255.255.255.255 UGH 0 0 0 eth0 32.1.72.136 * 255.255.255.255 UH 0 0 0 pdpbr0 192.168.11.0 * 255.255.255.0 U 0 0 0 tap0 192.168.43.0 * 255.255.255.0 U 0 0 0 eth0 default 192.168.11.1 0.0.0.0 UG 0 0 0 tap0 In the above case, even though there is a default route for tap0, all the multicast packets are being routed through eth0. How is this possible? Has anyone observed a similar problem and it would be really helpful if you can help us to discover services through zeroconf browser after the device is connected to remote network via openvpn through wifi. Thank You Very much, Mrunal

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• MySQL Config on Large Machine

  - by Jonathon

  We have a Windows 2003 Enterprise Edition server (64bit) running only MySQL 5.1.45 64-bit. It has 16G RAM and 10T of hard-drive space in RAID 10. We are having horrible performance from mysqld (85-100% CPU utilization). We were running a smaller machine with better performance, so I am assuming our my.ini file is not correct for our current machine. The my.ini file is as follows: [client] port=3306 [mysql] default-character-set=latin1 [mysqld] port=3306 basedir="D:/MySQL/" datadir="D:/MySQL/data" default-character-set=latin1 default-storage-engine=MYISAM sql-mode="" skip-innodb skip-locking max_allowed_packet = 1M max_connections=800 myisam_max_sort_file_size=5G myisam_sort_buffer_size=500M table_open_cache = 512 table_cache=8000 tmp_table_size=30M query_cache_size=50M thread_cache_size=128 key_buffer_size=3072M read_buffer_size=2M read_rnd_buffer_size=16M sort_buffer_size=2M #replication settings (this is the master) log-bin=log server-id = 1 Does anyone see anything wrong with this setup? For a machine with this much RAM, why in the world would mysqld eat up so much CPU? I know we can optimize some queries, etc., but it did run okay on a smaller machine, so I am pretty sure it is the config. Thanks in advance for any help.

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• mysql INNODB inserts very slow

  - by 133794m3r

  The database's schema is as follows. CREATE TABLE `items` ( `id` mediumint( 8 ) unsigned NOT NULL AUTO_INCREMENT , `name` varchar( 45 ) NOT NULL , `main_type` tinyint( 4 ) NOT NULL , `rarity` tinyint( 4 ) NOT NULL , `stack_size` smallint( 6 ) NOT NULL , `sub_type` tinyint( 4 ) NOT NULL , `cost` mediumint( 8 ) unsigned NOT NULL , `ilvl` smallint( 6 ) unsigned NOT NULL DEFAULT '0', `flavor_text` varchar( 250 ) NOT NULL , `rlvl` tinyint( 3 ) unsigned NOT NULL , `final` tinyint( 4 ) NOT NULL DEFAULT '0', PRIMARY KEY ( `id` ) ) ENGINE = InnoDB DEFAULT CHARSET = ascii; Now, doing an insert on this table takes 0.22 seconds. I don't know why it's taking so long to do a single row insert. Reads are really really fast something like 0.005 seconds. With using the example configuration from here dev mysql innodb it averages ~0.002 to ~0.005 seconds. Why it takes more than 100x more time to do a single insert makes no sense to me. My computer is as follows. OS:Debian Sid x86-x64, Mysql 5.1, RAM:4GB ddr2, cpu 2.0Ghz dual core, HDD 7200RPM 32MB cache 640GB. Why it's taking almost 100x as much time for a SELECT * FROM items; vs INSERT INTO items ...; will never make any sense to me. It's still a small table at only 70 rows, and took that long even when it had 0 rows.

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• What are the possible disadvantages of enabling the "data access" server option in sys.servers for t

  - by Corp. Hicks

  We plan to change the default server options of an SQL2k5 server instance by enabling data access. The reason is that we want to run "SELECT * FROM OPENQUERY(LOCALSERVER, '...')" -like statements on the server. What are the possible disadvantages of enabling server option "data access" (alias sys.servers.is_data_access_enabled) for the local server (sys.servers.server_id = 0)? (There must be a reason for MS setting this option to disabled by default...) EDIT: it turns out that I'm not the first person to ask this question: http://sqlblogcasts.com/blogs/piotr_rodak/archive/2009/11/22/data-access-setting-on-local-server.aspx "The DATA ACCESS server option is not very well documented in my opinion - the Books On Line say it is a property of linked servers. It doesn't mention at all that you actually can have it enabled on your local server to enable OPENQUERY calls. I noticed that when you disable DATA ACCESS on a linked server, you can't query any table located on it (I tested it on my loopback server) neither using OPENQUERY nor four-part naming convention. You can still call procedures (with four-part naming) that return rowsets. Well, the interesting question is why it is disabled by default on local server - I suppose to discourage users from using OPENQUERY against it." It also seems that the author of the post (Pjotr Rodak) is a Stack Overflow user :-)

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• Supervisord doesn't stop nginx process

  - by Lennart Regebro

  I'm using Supervisor a lot, and in this project I have an nginx process managed by Supervisord. The relevant parts of the configuration is this: [supervisord] logfile=/home/projects/eceee-web/prod/var/log/supervisord.log logfile_maxbytes=5MB logfile_backups=10 loglevel=info pidfile=/home/projects/eceee-web/prod/var/supervisord.pid ; childlogdir=/home/projects/eceee-web/prod/var/log nodaemon=false ; (start in foreground if true;default false) minfds=1024 ; (min. avail startup file descriptors;default 1024) minprocs=200 ; (min. avail process descriptors;default 200) directory=/home/projects/eceee-web/prod [program:nginx] command = /home/projects/eceee-web/prod/bin/nginx redirect_stderr = true autostart= true autorestart = true directory = /home/projects/eceee-web/prod stdout_logfile = /home/projects/eceee-web/prod/var/log/nginx-stdout.log stderr_logfile = /home/projects/eceee-web/prod/var/log/nginx-stderr.log The /home/projects/eceee-web/prod/bin/nginx command will start nginx in the foreground, it does not deamonify itself. Still, stopping it will fail: supervisorctl stop nginx Will not give any answer, but the process will continue. Any idea what? This is on OS X Darwin, with Supervisor 3.0a9 and nginx 0.7.65.

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• Why won't IIS serve my website? - 404 Page Not Found

  - by Giffyguy

  Built a brand new server, with a fresh copy of Windows Server 2003 Enterprise x86 Edition. Installed the .NET Framework 1.1, 2.0, 3.5, and 4.0 Added the "Domain Controller" and "Application Server" roles. Created a new website, pointed it to a local directory: C:\Inetpub\angryoctopus.net\ Added the appropriate headers: angryoctopus.net, www.angryoctopus.net, TCP port 80, all IPs Moved the website content into the local directory. Configured the default document in IIS: Default.aspx Enabled ASP.NET for this website, and set it to the correct version: 2.0.50727 Configured the zone angryoctopus.net in DNS. Tested DNS lookup here to ensure DNS was functional. Opened website in VS 2008 and re-built (and debugged) to ensure the content was functional. I can clearly see that IIS is responding normally, by browsing directly to my server's IP address. Since this does not use the angryoctopus HTTP header, the default website is displayed instead: the "Under Construction" page. And yet, after all of this, angryoctopus.net still returns 404. Does anybody know what could be wrong? What troubleshooting steps have I forgotten? Is there a command-line diagnostic that might provide more information?

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• Ubuntu Laptop as a wireless hotspot on bridge mode

  - by nixnotwin

  I have a wired router to which my ubuntu laptop connects via ethernet. The wierless NIC of the laptop acts as a wireless hotspot on master mode. I use hostapd fo this. I have bridged eth0 and wlan0, so my wireless clients that connect to my laptop over wifi get ip from the wired router via dhcp, so the devices get registered at the wired router ( and the laptop is just an access point). I use the following commands to get my laptop+accesspoint working: sudo brctl addbr br0 sudo brctl addif br0 eth0 sudo hostapd /etc/hostapd/hostapd.conf & sudo dhclient -d br0 & sudo ifconfig wlan0 192.168.1.15 netmask 255.255.255.0 up sudo brctl addif br0 wlan0 These commands enable me to access internet on my wireless clients and also on the laptop which is acting as wireless accesspoint. But if I reboot the wired router (without rebooting the laptop that is acting as accesspoint), Internet access on the laptop+accesspoint gets lost, but on wireless clients it works fine. Even I have not been able to figure out a command which will reset the laptop interfaces to default settings, so everytime the router reboots, I have to reboot the laptop too to get into default settings so that I can re-enter the above mentioned commands. My first question is How can I have my bridge+accesspoint up and running even-though the router reboots? And is there a command to set the interfaces to a default state? (ifdown -a doesn't work, after issuing the command the bridge still remained).

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• avconv gets killed if mkv has subtitles

  - by Lukas Knuth

  What I'm trying to do is to take a movie (in an Matroska container), convert all audio tracks to AC3 and don't touch anything else. I'm using this line: avconv -i infile.mkv -map 0 -vcodec copy -scodec copy -acodec ac3 -ab 256k outfile.mkv This works fine, except when there are subtitles embedded. Then, after some time processing with no progress, avconv just "dies" (output shortened, these seem to be the interesting parts): [matroska,webm @ 0xf867a0] max_analyze_duration reached [matroska,webm @ 0xf867a0] Estimating duration from bitrate, this may be inaccurate ... Incompatible sample format 's16' for codec 'ac3', auto-selecting format 'flt' ... Stream #0.0(eng): Video: H264 / 0x34363248, yuv420p, 1280x536 [PAR 1:1 DAR 160:67], q=2-31, 1k tbn, 1k tbc (default) Stream #0.1(ger): Audio: ac3, 48000 Hz, 5.1, flt, 256 kb/s (default) Stream #0.2(eng): Audio: ac3, 48000 Hz, 5.1, flt, 256 kb/s Stream #0.3(ger): Subtitle: dvdsub (default) (forced) Metadata: title : forced Stream #0.4(ger): Subtitle: dvdsub Metadata: title : complete Stream mapping: Stream #0:0 -> #0:0 (copy) Stream #0:1 -> #0:1 (dca -> ac3) Stream #0:2 -> #0:2 (dca -> ac3) Stream #0:3 -> #0:3 (copy) Stream #0:4 -> #0:4 (copy) Input stream #0:2 frame changed from rate:48000 fmt:s16 ch:6 to rate:48000 fmt:flt ch:6 Input stream #0:1 frame changed from rate:48000 fmt:s16 ch:6 to rate:48000 fmt:flt ch:6 frame= 2606 fps=1303 q=-1.0 size= 3kB time=107.36 bitrate= 0.2kbits/s ... frame=96141 fps=813 q=-1.0 size= 2195806kB time=2807.04 bitrate=6408.2kbits/s frame=96251 fps=810 q=-1.0 size= 2195806kB time=2807.04 bitrate=6408.2kbits/s ... frame=97015 fps=397 q=-1.0 size= 2195806kB time=2807.04 bitrate=6408.2kbits/s Getötet ["Killed", in English] I have no idea why this happens, as there is no error-output. I'd like to just copy the subtitles over, not touch them at all. If that won't work, they can be completely dropped.

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• Ubuntu Laptop as a wireless hotspot on bridge mode

  - by nixnotwin

  I have a wired router to which my ubuntu laptop connects via ethernet. The wierless NIC of the laptop acts as a wireless hotspot on master mode. I use hostapd fo this. I have bridged eth0 and wlan0, so my wireless clients that connect to my laptop over wifi get ip from the wired router via dhcp, so the devices get registered at the wired router ( and the laptop is just an access point). I use the following commands to get my laptop+accesspoint working: sudo brctl addbr br0 sudo brctl addif br0 eth0 sudo hostapd /etc/hostapd/hostapd.conf & sudo dhclient -d br0 & sudo ifconfig wlan0 192.168.1.15 netmask 255.255.255.0 up sudo brctl addif br0 wlan0 These commands enable me to access internet on my wireless clients and also on the laptop which is acting as wireless accesspoint. But if I reboot the wired router (without rebooting the laptop that is acting as accesspoint), Internet access on the laptop+accesspoint gets lost, but on wireless clients it works fine. Even I have not been able to figure out a command which will reset the laptop interfaces to default settings, so everytime the router reboots, I have to reboot the laptop too to get into default settings so that I can re-enter the above mentioned commands. My first question is How can I have my bridge+accesspoint up and running even-though the router reboots? And is there a command to set the interfaces to a default state? (ifdown -a doesn't work, after issuing the command the bridge still remained).

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• trying to figure out how to bridge two virtual networks together and in turn bridge that to the internet for a virtual inline IDS/IPS system

  - by Tony robinson

  I'm trying to figure out how to bridge two vmware (server or workstation, workstation) or virtualbox networks together with a linux IDS/IPS system transparently inline between both the virtual networks. How do I accomplish this? I understand how to bridge to virtual networks together, but how to I make the linux virtual machine sit between them and force traffic to go across the transparent bridge? I would like to have something along the lines of: vmnet a various vms host-only network ---- inline linux box vmnet a boxes forced to go through here to get to the internet --- vmnet b network with internet access configured as either NAT or bridged -- internet I know that basically the linux box needs two virtual nics, one on vmnet a and vmnet b, but other than that, I don't know how to force all the traffic to go across the "transparent" bridging linux box on its way to the internet. Do vmnet a and b have to be the same ip network with the same default route? does vmnet a not have a default route and vmnet b have a default route? I've read in vmware forums that on the linux host you need to change permissions on the vmnet files for promiscuous mode? is this true? how do you configure this scenario on a windows box?

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• pfSense router on a LAN with two gateways

  - by JohnCC

  I have a LAN with an ADSL modem/router on it. We have just gained an alternative high-speed internet connection at our location, and I want to connect the LAN to it, eventually dropping the ADSL. I've chosen to use a small PFSense box to connect the LAN to the new WAN connection. Two servers on the LAN run services accessible to the outside via NAT using the single ADSL WAN IP. We have DNS records which point to this IP. I want to do the same via the new connection, using the WAN IP there. That connection permits multiple IPs, so I have configured pfSense using virtual IP's, 1:1 NAT and appropriate firewall rules. When I change the servers' default gateway settings to the pfSense box, I can access the services via the new WAN IPs without a problem. However, I can no longer access them via the old WAN IP. If I set the servers' default gateway back to the ADSL router, then the opposite is true - I can access the services via the ADSL IP, but not via the new one. In the first case, I believe this is because an incoming SYN packet arrives at the ADSL WAN IP, and is NAT'd and sent to the internal IP of the server. The server responds with a SYN/ACK which it sends via its default gateway, the pfSense box. The pfSense box sees a SYN/ACK that it saw no SYN for and drops the packet. Is there any sensible way around this? I would like the services to be accessible via both IPs for a short period at least, since once I change the DNS it will take a while before everyone picks up the new address.

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• Enabling NAT forwarding using a second WAN interface and a second gateway on ubuntu

  - by nixnotwin

  I have 3 interfaces: eth0 192.168.0.50/24 eth1 10.0.0.200/24 eth2 225.228.123.211 The default gateway is 192.168.0.1 which I want to keep as it is in the changes I want to make. I want to masquerade eth1 10.0.0.200/24 and enable NAT forwarding to eth2. So I have done this: ip route add 225.228.123.208/29 dev eth2 src 225.228.123.211 table t1 ip route add default via 225.228.123.209 dev eth2 table t1 ip rule add from 225.228.123.211 table t1 ip rule add to 225.228.123.211 table t1 Now I can receive ping replies from any internet host if I did: ping -I eth2 8.8.8.8 To enable NAT forwarding I did this: sudo iptables -A FORWARD -o eth2 -i eth1 -s 10.0.0.0/24 -m conntrack --ctstate NEW -j ACCEPT sudo iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT sudo iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE But it isn't working. To test I used a client pc and put it on 10.0.0.0/24 network and gateway was set as 10.0.0.200. I want to have 192.168.0.1 as default gateway. And the traffic that comes in via eth1 10.0.0.200/24 should be forwarded to eth2 225.228.123.211. I have enabled forwarding on ubuntua also.

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• How can I find out if a port is opened or not?

  - by Roman

  I have installed Apache server on my Windows 7 computer. I was able to display the default index.php by typing http://localhost/ in the address line of my browser. However, I am still unable to see this page by typing IP address of my computer (neither locally (from the same computer) no globally (from another computer connected to the Internet)). I was told that I need to open port 80. I did it (in a way described here) but it did not solve the problem. First of all I would like to check which ports are opened and which are not. For example I am not sure that my port 80 was closed before I tried to open. I am also not sure that it is opened after I tried to open it. I tried to run a very simple web server written in Python. For that I used port 81 and it worked! And I did not try to open the port 81. So, it was opened by default. So, if 81 is opened by default, why 80 is not? Or it is? ADDITIONAL INFORMATION: 1. In my httpd.conf file I have "Listen 80". 2. This site tells me that port 80 on my computer is opened. 3. I get different responses if I try http://myip:80 and http://myip:81. In the last case browser (Chrome) writes me that link is broken. In the first case I get: Forbidden You don't have permission to access / on this server. 4. IE writes that "The website declined to show this webpage".

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• erlyvideo server doesn't start automatically after reboot

  - by electroid

  I have installed erlyvideo server on ubuntu 9.10 karmic koala. Everything works fine, but after server reboot I have to start erlyvideo server manually with /etc/init.d/erlyvideo start. I try allready update-rc.d and I think erlyvideo by default should start automaticaly. Any help will be appreciated. Here erlyvideo startup script located in /etc/init.d/erlyvideo: #!/bin/sh ### BEGIN INIT INFO # Provides: erlyvideo # Required-Start: $local_fs $network # Required-Stop: $local_fs $network # Default-Start: 2 3 4 5 # Default-Stop: 0 1 6 # Short-Description: starts the erlyvideo streaming server # Description: starts the erlyvideo using erlang system ### END INIT INFO case "$1" in start) cd /opt/erlyvideo && ./bin/erlyvideo "$1" ;; stop) cd /opt/erlyvideo && ./bin/erlyvideo "$1" ;; restart) cd /opt/erlyvideo && ./bin/erlyvideo "$1" ;; soft-restart) cd /opt/erlyvideo && ./bin/erlyvideo "$1" ;; upgrade) cd /opt/erlyvideo && ./bin/erlyvideo "$1" ;; reconfigure) cd /opt/erlyvideo && ./bin/erlyvideo "$1" ;; reboot) cd /opt/erlyvideo && ./bin/erlyvideo "$1" ;; ping) cd /opt/erlyvideo && ./bin/erlyvideo "$1" ;; console) cd /opt/erlyvideo && ./bin/erlyvideo "$1" ;; attach) cd /opt/erlyvideo && ./bin/erlyvideo "$1" ;; attach-erl) cd /opt/erlyvideo && ./erts-5.8.4/bin/erl -name [email protected] -remsh [email protected] ;; *) echo $"Usage: $0 {start|stop|restart|soft-restart|upgrade|reboot|ping|console|attach}" exit 1 esac exit 0 And I have found S91erlyvideo in /etc/rc2.d next to S91apache2 which starts just fine on every reboot.

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• Preventing DDOS/SYN attacks (as far as possible)

  - by Godius

  Recently my CENTOS machine has been under many attacks. I run MRTG and the TCP connections graph shoots up like crazy when an attack is going on. It results in the machine becoming inaccessible. My MRTG graph: mrtg graph This is my current /etc/sysctl.conf config # Kernel sysctl configuration file for Red Hat Linux # # For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and # sysctl.conf(5) for more details. # Controls IP packet forwarding net.ipv4.ip_forward = 0 # Controls source route verification net.ipv4.conf.default.rp_filter = 1 # Do not accept source routing net.ipv4.conf.default.accept_source_route = 0 # Controls the System Request debugging functionality of the kernel kernel.sysrq = 1 # Controls whether core dumps will append the PID to the core filename # Useful for debugging multi-threaded applications kernel.core_uses_pid = 1 # Controls the use of TCP syncookies net.ipv4.tcp_syncookies = 1 # Controls the maximum size of a message, in bytes kernel.msgmnb = 65536 # Controls the default maxmimum size of a mesage queue kernel.msgmax = 65536 # Controls the maximum shared segment size, in bytes kernel.shmmax = 68719476736 # Controls the maximum number of shared memory segments, in pages kernel.shmall = 4294967296 net.ipv4.conf.all.rp_filter = 1 net.ipv4.tcp_syncookies = 1 net.ipv4.icmp_echo_ignore_broadcasts = 1 net.ipv4.conf.all.accept_redirects = 0 net.ipv6.conf.all.accept_redirects = 0 net.ipv4.conf.all.send_redirects = 0 net.ipv4.conf.all.accept_source_route = 0 net.ipv4.conf.all.rp_filter = 1 net.ipv4.tcp_max_syn_backlog = 1280 Futher more in my Iptables file (/etc/sysconfig/iptables ) I only have this setup # Generated by iptables-save v1.3.5 on Mon Feb 14 07:07:31 2011 *filter :INPUT ACCEPT [1139630:287215872] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [1222418:555508541] Together with the settings above, there are about 800 IP's blocked via the iptables file by lines like: -A INPUT -s 82.77.119.47 -j DROP These have all been added by my hoster, when Ive emailed them in the past about attacks. Im no expert, but im not sure if this is ideal. My question is, what are some good things to add to the iptables file and possibly other files which would make it harder for the attackers to attack my machine without closing out any non-attacking users. Thanks in advance!

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• What kinds of protections against viruses does Linux provide out of the box for the average user?

  - by ChocoDeveloper

  I know others have asked this, but I have other questions related to this. In particular, I'm concerned about the damage that the virus can do the user itself (his files), not the OS in general nor other users of the same machine. This question came to my mind because of that ransomware virus that is encrypting machines all over the world, and then asking the user to send a payment in Bitcoin if he wants to recover his files. I have already received and opened the email that is supposed to contain the virus, so I guess I didn't do that bad because nothing happened. But would I have survived if I opened the attachment and it was aimed at Linux users? I guess not. One of the advantages is that files are not executable by default right after downloading them. Is that just a bad default in Windows and could be fixed with a proper configuration? As a Linux user, I thought my machine was pretty secure by default, and I was even told that I shouldn't bother installing an antivirus. But I have read some people saying that the most important (or only?) difference is that Linux is just less popular, so almost no one writes viruses for it. Is that right? What else can I do to be safe from this kind of ransomware virus? Not automatically executing random files from unknown sources seems to be more than enough, but is it? I can't think of many other things a user can do to protect his own files (not the OS, not other users), because he has full permissions on them.

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• Disadvantages of enabling 'Low Fragmentation Heap' LFH on Windows Server 2003?

  - by James Wiseman

  I've been investigating an issue with a production Classic ASP website running on IIS6 which seems indicative of memory fragmentation. One of the suggestions of how to ameliorate this came from Stackoverflow: How can I find why some classic asp pages randomly take a real long time to execute?. It suggested flipping a setting in the site's global.asa file to 'turn on' Low Fragmentation Heap (LFH). The following code (with a registered version of the accompanying DLL) did the trick. Set LFHObj=CreateObject("TURNONLFH.ObjTurnOnLFH") LFHObj.TurnOnLFH() application("TurnOnLFHResult")=CStr(LFHObj.TurnOnLFHResult) (Really the code isn't that important to the question). An author of a linked post reported a seemingly magic resolution to this issue, and, reading around a little more, I discovered that this setting is enabled by default on Windows Server 2008. So, naturally, this left me a little concerned: Why is this setting not enabled by default on 2003, or If it works in 2008 why have Microsoft not issued a patch to enable it by default on 2003? I suspect the answer to the above is the same for both (if there is one). Obviously, we're testing it in a non-production environment, and doing an array of metrics and comparisons to deem if it does help us. But aside from this I'm really just trying to understand if there's any technical reason why we should do this, or if there are any gotchas that we need to be aware of.

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• VPN messes up DNS resolution

  - by user124114

  After connecting with the Kerio VPN client (OS X Leopard) to a server, the internet (~web browsing) stopped working for the client. After poking around, the issue seems to be bad DNS server (i.e., entering IPs directly works). After disconnecting from the VPN, the invalid DNS server disappears from scutil --dns and all's well again. Now, I don't understand why OS X on the client even changes the DNS settings -- internet should be routed through a different interface, through the default gateway, not through the VPN. Questions: By what mechanism does connecting the VPN client change the "default" DNS server? How can I stop the VPN client from changing routing/DNS rules? Where is this stuff stored/modified? Before VPN: $ scutil --dns DNS configuration resolver #1 nameserver[0] : 10.66.77.1 # <---- default gateway = home router; all good order : 200000 resolver #2 domain : local options : mdns timeout : 2 order : 300000 ... VPN connected: $ scutil --dns DNS configuration resolver #1 nameserver[0] : 192.168.1.1 # <--- rubbish nameserver[1] : 192.168.2.1 order : 200000 resolver #2 domain : local options : mdns timeout : 2 order : 300000 ... The VPN doesn't appear among $ networksetup -listallnetworkservices.

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• SharePoint 2010 Enterprise wiki - [New page] missing

  - by icelava

  I am trying to ramp up knowledge on SharePoint deployment and usage (never did before), due to a direction to use SharePoint 2010 as a repository platform (wiki format) for our customer's infrastructure documentation. In my test virtual server, a new site of Enterprise wiki template was setup. Went into Site Actions Manage Site Features to activate Wiki Page Home Page. The default sub-web then went from /Pages to /SitePages and looks like the default Team template. The odd thing is the Site Actions is missing the New Page option. My colleague does not understand why this is the case, as it ought to be there. The original /Pages sub-web does have the option. What conditions are in play that influences the appearance of that option? UPDATE Another phenomenon observed is in the Site Actions View All Site Content view, the wiki document libraries listed in the grid will have their hyperlink (e.g. "Site Pages") lead straight to the direct default page. It would not show its own table listing of pages under that document library, unlike the original Pages document library, which expectedly show up as a listing. I wonder if this hints to any problems.

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• What are these CPU cache settings? Snoop Filter, ACL prefetch, HW prefetch

  - by eater

  I was in my BIOS setup turning on VT-x support today and saw these other settings. A little googling indicates that they each seem to turn on some sort of optimization to do with the CPU's L2 cache. They were all turned off by default. The processor in question is an Intel Xeon quad-core 3.4GHz (X5492). My OS is Linux 2.6.35.10-74.fc14.x86_64 #1 SMP Thu Dec 23 16:04:50 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux. I have 4GB of RAM if that matters. Here's what the BIOS manufacturer has to say: Snoop Filter Enabling the snoop filter typically improves performance by reducing snoop traffic on the frontside bus in dual processor configurations. Well I like the sound of improved performance. Why would the BIOS have this off by default? Or by dual processor do they not mean multi-core? Regardless, is there a downside if this is on? ACL Prefetch When enabled, the Adjacent Cache Line Prefetcher fetches both cache lines that comprise a cache line pair when it determines required data is not currently in its cache. When disabled, the processor will only fetch the cache line required by the processor. HW Prefetch Fetches an extra line of data into L2 from external memory. Both of these sound like optimizations that have some drawbacks. What are the reasons to turn them on? What are the reasons to leave them off. Why is the default off?

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• OpenLDAP ACLs are not working

  - by Dr I

  First things first, I'm currently working with an OpenLDAP: slapd 2.4.36 on a Fedora release 19 (Schrödinger’s Cat). I've just install the openldap with yum and my configuration is the following one: ##### OpenLDAP Default configuration ##### # ##### OpenLDAP CORE CONFIGURATION ##### include /etc/openldap/schema/core.schema include /etc/openldap/schema/cosine.schema include /etc/openldap/schema/inetorgperson.schema include /etc/openldap/schema/nis.schema pidfile /var/lib/ldap/slapd.pid loglevel trace ##### Default Schema ##### database mdb directory /var/lib/ldap/ maxsize 1073741824 suffix "dc=domain,dc=tld" rootdn "cn=root,dc=domain,dc=tld" rootpw {SSHA}SECRETP@SSWORD ##### Default ACL ##### access to attrs=userpassword by self write by group.exact="cn=administrators,ou=builtin,ou=groups,dc=domain,dc=tld" write by anonymous auth by * none I launch my OpenLDAP service using: /usr/sbin/slapd -u ldap -h ldapi:/// ldap:/// -f /etc/openldap/slapd.conf As you can see it's a pretty simple ACL which aim to allow access to the userPassword attribute to a specific group read only, then to the owner read and write to anonymous requiring auth and refuse the access to everyone else. The problem is: Even using a valid user with correct password my ldapsearch ends with zero informations retrieved from the directory, plus I've got a strange response on the result line. # search result search: 2 result: 32 No such object # numResponses: 1 here is the ldapsearch request: ldapsearch -H ldap.domain.tld -W -b dc=domain,dc=tld -s sub -D cn=user,ou=service,ou=employees,ou=users,dc=domain,dc=tld I did not specify any filter as I want to check that ldapsearch is correctly printing only allowed attribute.

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• Why is this setting for Name-based Virtual Host settings not working?

  - by Kave

  I have two domains (siteA.com & SiteB.com) that point to the same webserver and I would like to show different web pages for each. The steps I have taken so far are: Copy the default site (siteA) to siteB 1) sudo cp /etc/apache2/sites-available/default /etc/apache2/sites-available/siteB 2) sudo vim /etc/apache2/sites-available/siteB <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /var/www/siteB <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/siteB> Options Indexes FollowSymLinks MultiViews AllowOverride FileInfo Indexes Order allow,deny allow from all </Directory> </VirtualHost *:80> Then I created under /var/www/siteB and created a sample index.html in there. However when I load my domain siteB.com I still get directed to /var/www/siteA. Why is that? Do I have to rename the /etc/apache2/sites-available/default to /etc/apache2/sites-available/siteA as well? UPDATE: Thanks to the answer below it seems I had forgotten next to enabling the site also another entry: <VirtualHost *:80> ServerAdmin [email protected] ServerName siteB.com ServerAlias www.siteB.com </VirtualHost *:80> in order to include all subdomains as well then do: <VirtualHost *:80> ServerAdmin [email protected] ServerName siteB.com ServerAlias *.siteB.com </VirtualHost *:80> Same goes for siteA.

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• Apache HTTP Server+Tomcat: Which file generates mod_jk.conf, how to modify generated stuff, and how does httpd reach it?

  - by Sk8erPeter

  I'm using XAMPP with Apache HTTP Server and Tomcat Add-On installed. There's a default mod_jk.conf which is generated by Tomcat when starting it. But which file generates this mod_jk.conf file? How can I modify default values? By default, it looks like this: pastebin - mod_jk.conf. How does Apache HTTP Server reach this file? I can't see any reference to this file when looking into httpd.conf. When I put a VirtualHost in my httpd.conf file, and I put the line JkMount /* ajp13 into it, Apache HTTP Server service can't start (causes a 7024 event id error in Event Viewer (with error code 1, but nothing specific), but puts no error messages into error.log. The VirtualHost looks like this: pastebin - VirtualHost + JkMount. This way Apache HTTP Server can not start. If I comment out the line JkMount /* ajp13, it starts without a problem. BUT if I put the following line, which is the same as in mod_jk.conf, before the mentioned VirtualHost again, the service can start! <IfModule !mod_jk.c LoadModule jk_module "C:/xampp/tomcat/xampp/apache/modules/mod_jk.so" </IfModule Why do I have to put this line in again? Why does that happen, that the http://localhost/example does work, so this query is redirected to AJP13, but I have to put the LoadModule line in again in another file? EDIT: I don't have a clue why, I surely modified something, but now /example doesn't work either... And the config above gives a 500 Internal Server Error... :S Thanks!

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• Conditionally set an Apache environment variable

  - by Tom McCarthy

  I would like to conditionally set the value of an Apache2 environment variable and assign a default value if one of the conditions is not met. This example if a simplification of what I'm trying to do but, in effect, if the subdomain portion of the host name is hr, finance or marketing I want to set an environment var named REQUEST_TYPE to 2, 3 or 4 respectively. Otherwise it should be 1. I tried the following configuration in httpd.conf: <VirtualHost *:80> ServerName foo.com ServerAlias *.foo.com DocumentRoot /var/www/html SetEnv REQUEST_TYPE 1 SetEnvIfNoCase Host ^hr\. REQUEST_TYPE=2 SetEnvIfNoCase Host ^finance\. REQUEST_TYPE=3 SetEnvIfNoCase Host ^marketing\. REQUEST_TYPE=4 </VirtualHost> However, the variable is always assigned a value of 1. The only way I have so far been able get it to work is to replace: SetEnv REQUEST_TYPE 1 with a regular expression containing a negative lookahead: SetEnvIfNoCase Host ^(?!hr.|finance.|marketing.) REQUEST_TYPE=1 Is there a better way to assign the default value of 1? As I add more subdomain conditions the regular expression could get ugly. Also, if I want to allow another request attribute to affect the REQUEST_TYPE (e.g. if Remote_Addr = 192.168.1.[100-150] then REQUEST_TYPE = 5) then my current method of assigning a default value (i.e. using the regular expression with a negative lookahead) probaby won't work.

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• Linux arp cache timeout values

  - by Jak

  I'm trying to configure sane values for the Linux kernel arp cache timeout, but I can't find a detailed explanation as to how they work anywhere. Even the kernel.org documentation doesn't give a good explanation, I can only find recommended values to alleviate overflow. Here is an example of the values I have: net.ipv4.neigh.default.gc_thresh1 = 128 net.ipv4.neigh.default.gc_thresh2 = 512 net.ipv4.neigh.default.gc_thresh3 = 1024 Now, from what I've gathered so far: gc_thresh1 is the number of arp entries allowed before the garbage collector starts removing any entries at all. gc_thresh2 is the soft-limit, which is the number of entries allowed before the garbage collector actively removes arp entries. gc_thresh3 is the hard limit, where entries above this number are aggressively removed. Now, if I understand correctly, if the number of arp entries goes beyond gc_thresh1 but remains below gc_thresh2, the excess will be removed periodically with an interval set by gc_interval. My question is, if the number of entries goes beyond gc_thresh2 but below gc_thresh3, or if the number goes beyond gc_thresh3, how are the entries removed? In other words, what does "actively" and "aggressively" removed mean exactly? I assume it means they are removed more frequently than what is defined in gc_interval, but I can't find by how much.

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