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• DNS protocol message example

  - by virtual-lab

  hello there, I am trying to figure out how to send out DNS messages from an application socket adapter to a DNSBL. I spent the last two days understanding the basics, including experimenting with WireShark to catch an example of message exchanged. Now I would like to query the DNS without using dig or host command (I'm using Ubuntu); how can I perform this action at low level, without the help of these tools in wrapping the request in a proper DNS message format? How the message should be post it? Hex or String? Thanks in advance for any help. Regards Alessandro Ilardo

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• 100% CPU Runaway Processes (NCurses?)

  - by BCable

  This is a problem I've had for years, but just haven't posted anywhere about it until now. I'm running GRML, a Debian squeeze based Linux distro, and occasionally certain processes will runaway and cause 100% CPU usage. The only way I can usually know is when my thermal meter on my statusbar will turn yellow. Sometimes I run fullscreen applications when it happens, though, so I sometimes don't catch it, leaving my computer wasting away at my CPU. The processes that I can think of off the top of my head are these: abook, aumix, hnb, wyrd. They are all NCurses based console applications, and there are others that are also NCurses based. Is there a bug in NCurses somewhere that I need patched or something? This also happened on the same distro with the same applications on a different laptop with the same configurations. Any ideas? Thanks!

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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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• LinkSys WRT54GL + AM200 in half-bridge mode - UK setup guide recommendations?

  - by Peter Mounce

  I am basically looking for a good guide on how to set up my home network with this set of hardware. I need: Dynamic DNS Firewall + port-forwarding VPN Wake-on-LAN from outside firewall VOIP would be nice QoS would be nice (make torrents take lower priority to other services when those other services are happening) DHCP Wireless + WPA2 security Ability to play multiplayer computer games I am not a networking or computing neophyte, but the last time I messed with network gear was a few years ago, so am needing to dust off knowledge I kinda half have. I have read that I should be wanting to set up the AM200 in half-bridge mode, so that the WRT54GL gets the WAN IP - this sounds like a good idea, but I'd still like to be advised. I have read that the dd-wrt firmware will meet my needs (though I gather I'll need the vpn-specific build, which appears to preclude supporting VOIP), but I'm not wedded to using it. I live in the UK and my ISP supplies me with: a block of 8 static IPs, of which 5 are usable to me a PPPoA ADSL2+ connection

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• LinkSys WRT54GL + AM200 in half-bridge mode - UK setup guide recommendations?

  - by Peter Mounce

  Crossposted from here I am basically looking for a good guide on how to set up my home network with this set of hardware. I need: Dynamic DNS Firewall + port-forwarding VPN Wake-on-LAN from outside firewall VOIP would be nice QoS would be nice (make torrents take lower priority to other services when those other services are happening) DHCP Wireless + WPA2 security Ability to play multiplayer computer games I am not a networking or computing neophyte, but the last time I messed with network gear was a few years ago, so am needing to dust off knowledge I kinda half have. I have read that I should be wanting to set up the AM200 in half-bridge mode, so that the WRT54GL gets the WAN IP - this sounds like a good idea, but I'd still like to be advised. I have read that the dd-wrt firmware will meet my needs (though I gather I'll need the vpn-specific build, which appears to preclude supporting VOIP), but I'm not wedded to using it. I live in the UK and my ISP supplies me with: a block of 8 static IPs, of which 5 are usable to me a PPPoA ADSL2+ connection

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• Program or Firefox plugin to automatically manipulate website HTML using specific rules?

  - by Rookie

  I have noticed dozens of times how tedious some websites are. Therefore, I need a program, plugin for Firefox, or whatever that does the job - to be able to add some sort of checks to specific websites. For example, the program could search for a regexp pattern, and then do an action according to it. For example if I find some language from the wikipedia page, I would like to move or copy it on top of that languages list. The action wouldn't necessarily have to be applied on the regexp it found: it could issue another regexp search, and if it's found, it would do the actions I want, such as delete a block of other piece of HTML, move it, or copy it to another location.

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• Browser extension (or other software) to delay page load

  - by Doug Harris

  The alt text to today's comic at xkcd.com (strip below) says: After years of trying, I broke this habit in a day by decoupling the action and the neurological reward. I set up a simple 30-second delay I had to wait through, in which I couldn't do anything else, before any new page or chat client would load (and only allowed one to run at once). The urge to check all those sites magically vanished--and my 'productive' computer use was unaffected. (bold is my emphasis) Does anybody know of a browser extension or other software that will add this sort of delay? I've seen extensions which simply block sites, but not a delay like this.

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• Blocked connections passing through firewall. What is wrong?

  - by Kiranu

  In our company we have a small business router (Cisco RV082) on which we are using its standard configuration (block all incoming traffic). We also have an SMTP relay configured (using WS2008R2) so that our internal applications can send email through google apps (which requires authentication). The thing is that the server was being used to send spam. We fixed the problem by only allowing the server to relay email from our internal IP address range (10.0.0.0/16). My concern is that there was a way by which external IPs connected to the network and that underlying problem has not been fixed, but I cannot imagine how these machines connected. Any thoughts?

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• How to integrate Thunderbird with SpamAssassin running on the server?

  - by haimg

  I'm trying to integrate SpamAssassin running on a server with Thunderbird. Basically I need to be able to select several emails in Thunderbird and send them back to SpamAssassin for training, either as spam or ham. I tried several approaches: Tried "Report Spam" plugin, which is able to send message back to server either as an email attachment or via HTTP post. However, the plugin is rather buggy... Does not support sending several messages at once, "report as ham" is not working at all, etc. Wanted to make a custom button that will copy selected messages to a separate IMAP folder (I could create "LearnAsSpam" and "LearnAsHam" folders in IMAP that will get processed automatically on server), but don't even know how to approach this in Thunderbird, don't want to learn Thunderbird extention authoring... Server-side, I'm prepared to do some custom programming or integration needed (can receive a message via HTTP / SMTP / whatever), my stumbling block is Thunderbird... So, how can I send emails from Thunderbird back to SpamAssassin running on email server for Bayesian training, with as few keystrokes as possible?

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• Mikrotik queues and limiting total upstream bandwidth

  - by g18c

  With a Mikrotik router (form of embedded Linux) I have created simple queues per machine matched by source IP address. Each of the 4 machine queues has an unlimited burst 3Mbps/3Mbps for Tx/Rx. During speedtest.net on all 4 machines at the same time, each machine shows 3Mbps (and is limited correctly there), however the total bandwidth on the uplink goes to 12Mbps (i need to set this to 10Mbps max for the upstream). I want to restrict the actual traffic passing across the uplink port to 10Mbps regardless of what the other queues are doing (I need this catch all queue to have the final say on the uplink speed). For example I need: Scenario A Machine A transferring @ 3Mbps Machine B transferring @ 3Mbps Machine C transferring @ 3Mbps Machine D transferring @ 0Mbps Up-link speed = 9Mbps Scenario B Machine A trying to transfer @ 3Mbps Machine B trying to transfer @ 3Mbps Machine C trying to transfer @ 3Mbps Machine D trying to transfer @ 3Mbps Up-link speed = 10Mbps Actual transfer speed of machine A,B,C,D = 2.5Mbps This is to allow slight over subscription of bandwidth queues as not all will be transmitting at 3Mbps all the time. Is this possible and if so how would one go about doing this?

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• Firewall Deep Inspection Updates and Antivirus Subscription, worth it?

  - by msemack

  I realize that this is a subjective question, but I'm trying to get some experiences We have Juniper firewalls in our organization (SSG-320M, SSG-5, and some old NS-5GT). We have the option of a yearly subscription for: Deep Inspection Signature Updates Juniper-Kaspersky Antivirus I seem similar services available from other Firewall vendors. We have Symantec Endpoint Protection deployed to all workstations and servers, plus a dedicated appliance for e-mail spam/virus filtering. So, I'm not sure what these firewall-base services will bring to the table that I don't already have. I would appreciate some feedback from people using these firewall services (Juniper or otherwise). Are these services generally worth it? Do they really catch anything? Do they interfere with normal traffic (false positives)?

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• Snort [PFSense] is configured but not blocking or generating alerts!

  - by Chase Florell

  I've got PFSense V 2.0-RC1 (i386) and I've got the latest version of Snort installed I've loaded up a bunch of rules from Oinkmaster, I've enabled all of the preprocessors, and I've ensured the service is started. When I let it sit for a while and then check my Alerts and Block list, there are no entries. Even when I test it by logging into Skype (skype is listed as a Rule from P2P), I don't get any entries in the logs. If you need any further information, please let me know... I simply can't figure this one out.

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• Alternatives to the ClickToPlugin Safari extension for Chrome users

  - by Stewart Adam

  I have been using Safari with ClickToPlugin and was wondering if there was anything similar for Chrome. I am looking for both the click-through to plugin functionality as well as the HTML5 video replacements. I've done some looking around the Chrome extensions page and found some specific extensions to help with forcing the HTML5 on YouTube or to block Flash but none seem offer the generic functionality (click-through works for any given plugin) and flexibility that ClickToPlugin does (ClickToPlugin has HTML5 video replacements for a plethora of websites). I am looking to mimic the aforementioned features in Chrome, but they don't necessarily have to be provided by one single extension.

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• Run Wave Trusted Drive Manager from a bootable CD, recover crashed enrypted SSD?

  - by TigerInCanada

  Is there a way to run Wave Trusted Drive Manager from a live-cd to access a non-bootable SSD with Full Disk Encyption hard disk? http://www.wave.com/products/tdm.asp The crashed disk is a Samsung SSD PB22-JS3, 128Gb. Is has bad blocks at 128-block intervals. If the SSD password could be unset, is sending the unit for disaster recovery possible? What might cause a nearly new SSD to crash in this way, and what is the probability of it happening again? We have other units in service an I can do without every laptop disk in the company crashing...

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• What's required to enable communication between two IP ranges located behind one switch?

  - by Eric3

  Within our co-located networking closet, we have control over two ranges of 254 addresses, e.g. 64.123.45.0/24 and 65.234.56.0/24. The problem is, if a host has only one IP address, or a block of addresses in only one range, it can't contact any of the addresses in the other subnet. All of our hosts use our hosting provider's respective gateway, e.g. 64.123.45.1 or 65.234.56.1 A host on the 64.123.45.0/24 range can contact the 65.234.56.1 gateway and vice-versa Everything in our closet is connected to an HP ProCurve 2810 (a Layer 2-only switch), which connects through a Juniper NetScreen-25 firewall to the outside world What can I do to enable communication between the two ranges? Is there some settings I can change, or do I need better networking equipment?

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• mount fstab partition with public access

  - by Mikhail

  How do I specify that an fstab mount-point should be public? I want /mnt/windows to be accessible to normal users. I believe I am using ntfs-3g. If I set the /mnt/windows to 777 will it be publicly accessible without changing the permissions on the NTFS disk? /dev/sdb4 /mnt/windows ntfs noatime 0 1 /dev/sdb5 / ext4 noatime 0 1 UUID=5AA4-168D /boot/efi vfat defaults 0 1 and localhost my_computer # stat /mnt/windows/ File: '/mnt/windows/' Size: 12288 Blocks: 24 IO Block: 512 directory Device: 814h/2068d Inode: 5 Links: 1 Access: (0700/drwx------) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2014-08-21 18:29:13.597722200 -0500 Modify: 2014-08-21 18:29:13.597722200 -0500 Change: 2014-08-21 18:29:13.597722200 -0500 Birth: -

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• Explorer hijacked by a trojan

  - by hsdb

  I managed to catch a newish trojan that my Anti virus program wasn't able to detect. I'm usually not that bad at technical stuff regarding computers but I really don't know what to do with this one anymore. The trojan somehow managed to get my Windows to recover it every time I try to remove it by deleting it's exe (called some weird name located in Programs "asdza/saddasn.exe" (example only)). It also sets an entry in my autostart. It starts a second explorer.exe and tries to connect to some server obviously trying to steal data. (glad I still have my firewall) How can I get rid of this trojan, I really need help. It is new and probably unrecognized by all major virus scanners.

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• Windows VPN not authenticating from ADSL to Wireless link

  - by deanvz

  I have a normal windows VPN on a computer connecting to a 196.201.x.x/24 IP. If this VPN tries to connect from any address in the 41.x.x.x range it cant get there. The server is a normal windows 2008 server, running exchange with a PPPoE IP natted to a public IP on the public gateway of the wireless network as the server is on site and its connectivity is derived from Mikrotik RB's. The computer on the 41 range can traceroute and ping the server, but the VPN does not authenticate. When on the network or any other, the VPN works fine. Is there something that could be configured on the VPN client? All firewall settings of a standard ADSL router have been checked and found to block only ICMP's. Is this a VPN configuration problem or a network issue?

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• What hardware is at physical address 0x80000000 on powerpc New World Macintosh?

  - by tinkerer

  Open Firmware device tree gives no clue what device might decode at physical address 0x80000000 to 0x8008200 on a G4 New World Macintosh. The mmu has three adjacent Virtual=Real translations for that block. They are the only address translations reported between the top or physical dram at 20000000 and the start of the PCI bridges at f0000000. (A possible clue is that frame-buffer-addr is reported as 9c008000 by Open Firmware, and that is not in the reported translation table either). I believe the architecture has been around since about 1999.

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• Set nginx.conf to deny all connections except to certain files or directories

  - by Ben

  I am trying to set up Nginx so that all connections to my numeric ip are denied, with the exception of a few arbitrary directories and files. So if someone goes to my IP, they are allowed to access the index.php file, and the phpmyadmin directory for example, but should they try to access any other directories, they will be denied. This is my server block from nginx.conf: server { listen 80; server_name localhost; location / { root html; index index.html index.htm index.php; } location ~ \.php$ { root html; fastcgi_pass unix:/var/run/php-fpm/php-fpm.sock; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /srv/http/nginx/$fastcgi_script_name; include fastcgi_params; } } How would I proceed? Thanks very much!

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• Advice for migrating email server

  - by Chris Adams

  Hi there, I'm planning to migrate a Zimbra server with about 200gb of data from a server hosted in an office into a datacentre, to increase uptime (we've had a couple of outages when our network here started flaking out, and we have people in other countries relying on this server too). However, I'm not sure how best to migrate the data into the data centre without rendering the connection unusable during office hours, because there's far too much to send in over night over the two meg upstream connection we have here. I'm familiar with using tools like nice to stop a long running process degrading machine performance - is there a simple way to throttle a connection between office hours, so the long running transfer doesn't block the pipe, but then opens up outside of office hours to make the most of the bandwidth? I'm aware the alternative here is to simply mail a hard drive to the data centre, but I'd like to avoid doing that if I could. We're using Centos Linux for our servers, in the office and the datacentre, so extra points for an open source linux answer.

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• PHP Script causing high CPU

  - by user20996

  I have a website which is causing me a major headache. There is one PHP script which is using far to much CPU, this only seem to happen when bots hit the site, I dont want to block all the bots because we need them. I have the the process manager output: Pid Owner Priority CPU % Memory % Command 16943 (Trace) (Kill) specialone 0 99.4 1.0 /usr/bin/php /var/www/specialone/page.php I ran strace -p 16943 on the process but it comes up with nothing. We have 2GB of RAM and the php memory_limit is set to 128M which should be enough. The trouble I have is the PHP code is a Framework and the culprit page.php pulls in a lot of other PHP files so I cant debug the PHP. Is there any way of finding out what the script is doing when its using so much CPU which will help me solve it?

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• Puppet: Conditional file source based on naming convention

  - by thinice

  I'm getting the ball rolling on puppet for my environment - and I'd like to have a conditional file resource based on whether or not the module itself contains a file based on a naming convention. So visually, assume a module named 'mysql' and it's layout: mysql/ /files /etc/ my.cnf my.hostname1.cnf my.hostname2.cnf /manifests init.pp ... So I'd like the block to verify if the resource for the module exists or not, and take action accordingly, in pseudo-terms: file { '/etc/my.cnf': if -f 'puppet:///mysql/etc/my.$hostname.cnf' { source => 'puppet:///mysql/etc/my.$hostname.cnf' } else { source => 'puppet:///mysql/etc/my.cnf' } } This way one wouldn't have to manage a csv file or the .pp file with a host specific case statement - is this possible?

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• How to tell if linux disk IO is causing excessive (> 1 second) application stalls

  - by noahz

  I have a Java application performing a large volume (hundreds of MB) of continuous output (streaming plain text) to about a dozen files a ext3 SAN filesystem. Occasionally, this application pauses for several seconds at a time. I suspect that something related to ext3 vsfs (Veritas Filesystem) functionality (and/or how it interacts with the OS) is the culprit. What steps can I take to confirm or refute this theory? I am aware of iostat and /proc/diskstats as starting points. Revised title to de-emphasize journaling and emphasize "stalls" I have done some googling and found at least one article that seems to describe behavior like I am observing: Solving the ext3 latency problem Additional Information Red Hat Enterprise Linux Server release 5.3 (Tikanga) Kernel: 2.6.18-194.32.1.el5 Primary application disk is fiber-channel SAN: lspci | grep -i fibre 14:00.0 Fibre Channel: Emulex Corporation Saturn-X: LightPulse Fibre Channel Host Adapter (rev 03) Mount info: type vxfs (rw,tmplog,largefiles,mincache=tmpcache,ioerror=mwdisable) 0 0 cat /sys/block/VxVM123456/queue/scheduler noop anticipatory [deadline] cfq

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• Shielded ethernet cable and ethernet sockets earthing how to?

  - by ageis23

  Hi I'm going to install 5 Ethernet sockets in my house using cat5e shielded cable. I decided to use this because the sockets will be on the second floor and the most practical way up is within a trunk along with some mains wiring. The cable will be terminated at the router and at the Ethernet faceplate. What can I use to earth then? The faceplate/router are both plastic hence no earth wire needed. I can't use the earth wire within the main socket can I? I figured it will be very very dangerous. I don't want to be connecting to the earth block on the mains either since I totally incompetent when it comes to mains electricity.

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