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• DRBD Not syncing between my nodes

  - by Mike Curry

  Some version info: Operating system is Ubuntu 11.10, on EC2, kernel is 3.0.0-16-virtual and the application info is: Version: 8.3.11 (api:88) GIT-hash: 0de839cee13a4160eed6037c4bddd066645e23c5 build by buildd@allspice, 2011-07-05 19:51:07 Getting some strange errors in dmesg (seen below) as well, there is no replication happening. I have made my first node primary and its showing: drbd driver loaded OK; device status: version: 8.3.11 (api:88/proto:86-96) srcversion: DA5A13F16DE6553FC7CE9B2 m:res cs ro ds p mounted fstype 0:r0 StandAlone Primary/Unknown UpToDate/DUnknown r----s ext3 my secondary node is showing: drbd driver loaded OK; device status: version: 8.3.11 (api:88/proto:86-96) srcversion: DA5A13F16DE6553FC7CE9B2 m:res cs ro ds p mounted fstype 0:r0 StandAlone Secondary/Unknown Inconsistent/DUnknown r----s Showing /proc/drbd on the master shows: version: 8.3.11 (api:88/proto:86-96) srcversion: DA5A13F16DE6553FC7CE9B2 0: cs:StandAlone ro:Primary/Unknown ds:UpToDate/DUnknown r----s ns:0 nr:0 dw:4 dr:1073 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:262135964 Showing /proc/drbd on the slave shows that there is nothing being transfered... version: 8.3.11 (api:88/proto:86-96) srcversion: DA5A13F16DE6553FC7CE9B2 0: cs:StandAlone ro:Secondary/Unknown ds:Inconsistent/DUnknown r----s ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:262135964 Here is my config... resource r0 { protocol C; startup { wfc-timeout 15; degr-wfc-timeout 60; } net { cram-hmac-alg sha1; shared-secret "test123; } on drbd01 { device /dev/drbd0; disk /dev/xvdm; address 23.XX.XX.XX:7788; # blocked out ip meta-disk internal; } on drbd02 { device /dev/drbd0; disk /dev/xvdm; address 184.XX.XX.XX:7788; #blocked out ip meta-disk internal; } } I have run the following on the master: sudo drbdadm -- --overwrite-data-of-peer primary all There is no firewall between the systems. Here is the dmesg with some errors: [2285172.969955] drbd: initialized. Version: 8.3.11 (api:88/proto:86-96) [2285172.969960] drbd: srcversion: DA5A13F16DE6553FC7CE9B2 [2285172.969962] drbd: registered as block device major 147 [2285172.969965] drbd: minor_table @ 0xffff88000276ea00 [2285173.000952] block drbd0: Starting worker thread (from drbdsetup [1300]) [2285173.003971] block drbd0: disk( Diskless -> Attaching ) [2285173.006150] block drbd0: No usable activity log found. [2285173.006154] block drbd0: Method to ensure write ordering: flush [2285173.006158] block drbd0: max BIO size = 4096 [2285173.006165] block drbd0: drbd_bm_resize called with capacity == 524271928 [2285173.008512] block drbd0: resync bitmap: bits=65533991 words=1023969 pages=2000 [2285173.008518] block drbd0: size = 250 GB (262135964 KB) [2285173.079566] block drbd0: bitmap READ of 2000 pages took 17 jiffies [2285173.081189] block drbd0: recounting of set bits took additional 1 jiffies [2285173.081194] block drbd0: 250 GB (65533991 bits) marked out-of-sync by on disk bit-map. [2285173.081203] block drbd0: Suspended AL updates [2285173.081210] block drbd0: disk( Attaching -> UpToDate ) [2285173.081214] block drbd0: attached to UUIDs 1C1291D39584C1D1:0000000000000004:0000000000000000:0000000000000000 [2285173.095016] block drbd0: conn( StandAlone -> Unconnected ) [2285173.095046] block drbd0: Starting receiver thread (from drbd0_worker [1301]) [2285173.099297] block drbd0: receiver (re)started [2285173.099304] block drbd0: conn( Unconnected -> WFConnection ) [2285173.099330] block drbd0: bind before connect failed, err = -99 [2285173.099346] block drbd0: conn( WFConnection -> Disconnecting ) [2285173.295788] block drbd0: Discarding network configuration. [2285173.295815] block drbd0: Connection closed [2285173.295826] block drbd0: conn( Disconnecting -> StandAlone ) [2285173.295840] block drbd0: receiver terminated [2285173.295844] block drbd0: Terminating drbd0_receiver Edit: Reading some other similar issues, it was suggested to do a 'drbdadm dump all', so I figured it couldn't hurt. ubuntu@drbd01:~$ drbdadm dump all /etc/drbd.conf:19: in resource r0, on drbd01: IP 23.XX.XX.XX not found on this host. and on slave: root@drbd02:~# drbdadm dump all /etc/drbd.conf:25: in resource r0, on drbd02: IP 184.XX.XX.XX not found on this host. Strange it doesn't find its own ip, however, this is an Amazon EC2 system using an elastic IP... here are my ipconfigs for both... master: ubuntu@drbd01:~$ ifconfig eth0 Link encap:Ethernet HWaddr 22:00:0a:1c:27:11 inet addr:10.28.39.17 Bcast:10.28.39.63 Mask:255.255.255.192 inet6 addr: fe80::2000:aff:fe1c:2711/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1569 errors:0 dropped:0 overruns:0 frame:0 TX packets:1169 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:124409 (124.4 KB) TX bytes:213601 (213.6 KB) Interrupt:26 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) slave: root@drbd02:~# ifconfig eth0 Link encap:Ethernet HWaddr 12:31:3f:00:14:9d inet addr:10.160.27.107 Bcast:10.160.27.255 Mask:255.255.254.0 inet6 addr: fe80::1031:3fff:fe00:149d/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:915 errors:0 dropped:0 overruns:0 frame:0 TX packets:774 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:75381 (75.3 KB) TX bytes:109673 (109.6 KB) Interrupt:26 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

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• .htaccess to block by file name possible?

  - by Tiffany Walker

  I have a bunch of files that are secure_xxxxxx.php. Is there a way to use .htaccess to block access to all the secure_* php files based on IP? EDIT: I've tried but I get 500 errors <FilesMatch "^secure_.*\.php$"> order deny all deny from all allow from my ip here </FilesMatch> Don't see any errors in apache error logs either httpd -M Loaded Modules: core_module (static) authn_file_module (static) authn_default_module (static) authz_host_module (static) authz_groupfile_module (static) authz_user_module (static) authz_default_module (static) auth_basic_module (static) include_module (static) filter_module (static) log_config_module (static) logio_module (static) env_module (static) expires_module (static) headers_module (static) setenvif_module (static) version_module (static) proxy_module (static) proxy_connect_module (static) proxy_ftp_module (static) proxy_http_module (static) proxy_scgi_module (static) proxy_ajp_module (static) proxy_balancer_module (static) ssl_module (static) mpm_prefork_module (static) http_module (static) mime_module (static) dav_module (static) status_module (static) autoindex_module (static) asis_module (static) info_module (static) suexec_module (static) cgi_module (static) dav_fs_module (static) negotiation_module (static) dir_module (static) actions_module (static) userdir_module (static) alias_module (static) rewrite_module (static) so_module (static) fastinclude_module (shared) auth_passthrough_module (shared) bwlimited_module (shared) frontpage_module (shared) suphp_module (shared) Syntax OK

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• Can i safely block all ports on my sever

  - by Saif Bechan

  I have a web server running pleks and get attacked a lot every day. I configured a firewall, and there are some predefined services such as www, and ftp, etc. I am planning to block all the ports except for the www port and the PLESK port. When I need ftp or ssh access for example i will open the ports in PLESK and then start to work. Is this a good thing to do or are there some downsides on doing this. There are some ports I am not sure of, such as SMTP,POP3,IMAP, DNS. Can i close these ports or is there no need to do so.

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• Block access to certain websites from other computers on shared internet connection

  - by Dheeraj V.S.

  I have very little knowledge about networking. I have an internet connection on my PC (running Windows XP). I've enabled internet connection sharing to other computers on my network connected using a WIFI router. I want to block use of GMail (in general, specific domains) from other computers, but should be able to access them from my own machine. I can't edit my hosts file because my machine too would lose access. I guess I need to configure my wireless router for that. But I have no idea how to do so. My wireless router is a Zyxel P-660HW-T1 v2. I'd appreciate any pointers.

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• Is there a way to communicate DBMS with raw memory block or binaries

  - by darkcminor

  I am trying to communicate a numerical matrix operations library like LAPACK with any DBMS. Is it possible to send/receive complete matrices as binary or as a direct memory pointers to process them (it will be something like: The Outside library processes data stored in DBMS, then it computes some huge matrix stuff and then via memory block or a binary DBMS get the result from library)? The main purpose is speed and avoid passing through a flat file, and last but not least, use library toefficiently do some operations DBMS are not designed to. * Is it possible that Oracle, SQL Server, MySQL support this technique?.

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• Finding the file that is on a bad block on a HFS+ volume (debugfs for HFS+)

  - by Blair Zajac

  I have a drive in our iMac that has bad blocks, as booting from an Ubuntu 11.10 live CD and using ddrescue -f /dev/sda /dev/null finds them. I'd like to get the drive to remap them by writing to the blocks, say using hdparm --write-sector, but I don't want to do this without knowing what's in those blocks and finding the file that owns them, so I can restore the file from another source. I found fileXray but don't feel like spending $79 to map a block to a file and hfsdebug has been taken offline. Are there suggestions on a tool or technique to use? I looked at all the Ubuntu HFS+ packages to see if they could provide this info but nothing jumped out at me. BTW, I used Disk Utility to erase the empty space, but it didn't get any of the bad blocks to be remapped, according to smartctl -A.

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• Watch Flash video but block out part of it

  - by Ken

  I'm learning a foreign language. There are several online sites that have Flash video in the language I'm learning (e.g., Hulu), which is great. Unfortunately, they have English subtitles, which is (depending on who you ask) somewhere between "annoying" and "actively harmful to my learning". When I'm watching them in a window, I can just move them near the bottom of the screen, or put another window over them. That's awkward, but it kind of works. But I'd like to watch them full-screen, on my TV set. Full-screen Flash doesn't let me put any window on top of it. Is there a way to watch an online Flash video but block out part of it? I'll probably be using my Mac for this, but maybe Linux -- solutions for either one welcome.

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• 'Object variable or With block variable not set' error when setting a range in VBA

  - by David Gard

  I have a function that creates a Pivot Table, but I am getting an error when I try to set a range that will be merged and have a title added to it. In the below code, pivot_title_range is a 'String' variable, and is optional when calling the funtion. title_range is a 'Range' variable. Both lines that set the range (whether or not the users declares pivot_title_range) cause the same error. If pivot_title_range = "" Then title_range = ActiveSheet.Range("B3:E4") Else title_range = ActiveSheet.Range(pivot_title_range) End If Here is the error that I am getting - Run-time error '91': Object variable or With block variable not set If required, here is a Pastebin of the full function - http://pastebin.com/L711jayc. The offending code starts on line 160. Is anybody able to tell me what I am doing wrong? Thanks.

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• block access to wrt from vlan using iptables dd-wrt

  - by NitroxDM

  I set up multiple isolated vlans in dd-wrt. Now I need to forward a port to vlan2. I isolated the vlans using: iptables -I FORWARD -i br0 -o vlan2 -j DROP iptables -I FORWARD -i br0 -o vlan3 -j DROP iptables -I FORWARD -i br0 -o vlan4 -j DROP Now I need to block a clients on each vlan from accessing the router. This doesn't work: iptables -I INPUT -i br0 -o vlan2 --dport telnet -j REJECT --reject-with tcp-reset I'm new it iptables... am I missing something?

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• Retrieve malicious IP addresses from Apache logs and block them with iptables

  - by Gabriel Talavera

  Im trying to keep away some attackers that try to exploit XSS vulnerabilities from my website, I have found that most of the malicious attempts start with a classic "alert(document.cookie);\" test. The site is not vulnerable to XSS but I want to block the offending IP addresses before they found a real vulnerability, also, to keep the logs clean. My first thought is to have a script constantly checking in the Apache logs all IP addresses that start with that probe and send those addresses to an iptables drop rule. With something like this: cat /var/log/httpd/-access_log | grep "alert(document.cookie);" | awk '{print $1}' | uniq Why would be an effective way to send the output of that command to iptables? Thanks in advance for any input!

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• Block a machine from accessing the internet

  - by Simon Rigby

  After some confirmation that I have thinking right in this scenario. We have a number of wired and wireless machines which presently have direct internet access. I also have a Linux (Ubuntu) server which is used as a file server for the network. Essentially I would like to be able to turn internet access on and off for machines. My plan is to block these machines by MAC address at the router. I would then set up a proxy server on the Linux box (ie Squid) so that the machines I wish to restrict can access the internet via the proxy. As I can adjust access via ACLs in squid, I would be able to switch on or off a machines access to the internet without having to further adjust the router's MAC rules. And of course I could go further and create a few scripts to assist with this admin task. Does this seem sound and have I over looked anything? Any help greatly appreciated. Simon.

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• How to block all multicast traffic travelling through a Cisco Catalyst 3750

  - by TrueDuality

  Something changed today. I can't seem to track down what, but one of our 3750s decided that it was going to forward all the multicast traffic it saw from the ghost server across every VLAN it has. I've tried writing a simple access group that consists of the following: access-list 100 deny ip any 224.0.0.10 0.0.0.255 access-list 100 permit ip any any I apparently mistakenly assumed that once applied to an interface that it would block all of the multicast traffic on that interface regardless of VLAN. I do not want any multicast traffic flowing through this particular switch to any VLAN or even to stay on the same VLAN beyond this switch. Does anyone have any ideas?

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• How to block spam site republishing my content

  - by Fo.

  I noticed today that Google search results shows some spam copies of one of my sites. The url looks something like this: http://[subdomain].spamsite.com/www.example.com ...where example.com is my site. In my Apache access logs I'm noticing several lines like the following whenever I load the above url: 127.0.0.1 - - [219/Oct/2012:19:27:34 +0000] "OPTIONS * HTTP/1.0" 200 - "-" "Apache (internal dummy connection)" The spammer's site shows an exact up to date copy of my site, so I think they are pulling in live data. Any idea how I can block this traffic?

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• Change Block Tracking settings not retained for a VM on VMWare 5.5

  - by Chris

  I'm trying to enable Change Block Tracking as per this VMWare KB article but the setting ctkEnabled is not being retained in the advanced options or being added to the vmx file. The setting scsi0:0.ctkEnabled is being retained and I see a file vmname-ctk.vmdk in the datastore. I've verified that the vm doesn't have any snapshots but don't see any other suggestions in the KB (or google, of course.) Edit: The last comment on this community post. It's a slightly different circumstance, but suggests that there is an known bug editing these settings in the web-gui.

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• Block Domain User login

  - by Param

  I have created a Domain User id ( for example - Auser ). I have integrated my LDAP login with Firewall. I use this user to login in to firewall only. So, I want to block all the login for this User except on Firewall. Is there any way to accomplish this? As per my knowledge, we can specify :- By right click on Domain User -- Properties -- Account tab -- Logonto ( but here we have to specify Computer Name, we don't have any computer name for Firewall -- So i can't use this option ) Through Group Policy Window Setting -- Security Setting -- Local Policies -- User Rights Assignment -- Allow logon Locally (But it has to apply on Computer OU -- So i can't use this option also ) Any Other Option you know ??

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• Block complete network access for one local user

  - by tumchaaditya

  Well, this is quite trivial question but I could not find a satisfactory answer even after trying many search queries both here and on Google. I want to share my PC with my room-mate. And I don't want him to access ANY network(LAN included). So, I can create an account for him and block network access for the same. I would prefer avoiding any third-party tools as far as possible. It's a simple home PC hooked up to a router for internet. No domain and other stuff. (Technically, guest account can achieve this. But somehow, the guest account on my PC has network access!)

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• iptables block everything except http

  - by arminb

  I'm trying to configure my iptables to block any network traffic except HTTP: iptables -P INPUT DROP #set policy of INPUT to DROP iptables -P OUTPUT DROP #set policy of OUTPUT to DROP iptables -A INPUT -p tcp --sport 80 -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A OUTPUT -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT The iptables output (iptables -L -v) gives me: Chain INPUT (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 4 745 ACCEPT tcp -- any any anywhere anywhere tcp spt:http state RELATED,ESTABLISHED Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 2 330 ACCEPT tcp -- any any anywhere anywhere tcp dpt:http state NEW,ESTABLISHED When I try to wget 127.0.0.1 (yes i do have a web server and it works fine) i get: --2012-11-14 16:29:01-- http://127.0.0.1/ Connecting to 127.0.0.1:80... The request never finishes. What am I doing wrong? I'm setting iptables to DROP everything by default and add a rule to ACCEPT HTTP.

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• How to block null/blank user-agents in IIS 7.5

  - by Jeremy

  We are going through a large scale DDOS attack, but it isn't the typical bot-net that our Cisco Guard can handle, it is a BitTorrent attack. This is new to me, so I am unsure how to stop it. Here are the stats IIS is processing between 40 and 100 requests per second from BitTorrent clients. We have about 20% of the User Agents, but the other 75% are blank. We want to block the blank user agents at the server level. What is the best approach?

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• Allow access only to one website

  - by Alex

  Hey. I'd like to allow access on a computer connected directly to the internet to one website ONLY. The solution of IE's "Content advisor" or firefox's "FoxFilter" isn't good enough because it actually downloads the data and just don't display it. I want to block the traffic before the requests are sent. How is it possible? Thanks. Edit: OS is windows xp. The browser can be firefox, iexplorer, chrome... It doesn't matter. The computer is connected directly to the modem.

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• Monitoring disk block access in Linux

  - by VoidPointer

  Is there a way to gather statistics about blocks being accessed on a disk? I have a scenario where a task is both memory and I/O intensive and I need to find a good balance as to how much of the available RAM I can assign to the process and how much I should leave for the system for building its I/O cache for the block device being used. I suspect that most of the I/O that is currently happening is accessing a rather small subset of the device and that performance could be optimized by increasing the RAM that is available for I/O buffering. Ideally, I would be able to create something like a "heat-map" that shows me which parts of the disk are accessed most of the time.

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• Error : [0.8879153] kernel panic -not syncing VFS unable to mount fs unknow block (8.3)

  - by user43069

  i installed ubuntu using wubit inside the windows and started working on it then i got this error afer updating [0.8879153] kernel panic -not syncing VFS unable to mount fs unknow block (8.3) and i can't user rescue mode and it's give me another error no filesystem could mount root ..... i looked at grub folder and didn' find any file on disks/boot/grub/ so i tryed to user super grub to fix it but it didn' work and it keep giving me. boot/grub/stage1 not found i didn't edit anything from grub folder. any idea plz .

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• Block a Server from reaching a machine

  - by user

  I have a Windows 2003 server that I want to block from accessing a specific IP address. I want to control this from the Server. because I control the machine. The traffic is http traffic (webservice call). It uses a non-standard port, so IP address+ Port combination would also work. Background: I have a development enviornment that for some reason is ignoring host file enteries under some circumstances. These host files point the enviornment at services in another Dev enviornment. Wne th host files are ignored, dev is talking to production. This is not my question, rather the motivation for this inquiry. I want is a failsafe to ensure dev will error instead of happily engaging in transactions with production. I control the dev server, I do not control the firewalls or the target production machine.

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• Why isn't the inline element inheriting height from its children?

  - by jbarz

  I'm trying to make a rather complicated grid of images and information (almost like Pinterest). Specifically, I'm trying to inline position one set of <ul>s right after another. I have it working but one aspect is causing issues so I'm trying to ask about this small piece to avoid the complication of the whole problem. In order to horizontally align the images and their information we are using inline <li>s with other inline-block level elements inside of them. Everything works correctly for the most part except that the <li>s have almost no height. HTML and CSS is in JSFiddle here if you want to mess with it in addition to below: HTML: <div> <ul class="Container"> <li> <span class="Item"> <a href="#"><img src="http://jsfiddle.net/img/logo.png"/></a> <span class="Info"> <a href="#">Title One</a> <span class="Details">One Point One</span> </span> </span> </li> <li> <span class="Item"> <a href="#"><img src="http://jsfiddle.net/img/logo.png"/></a> <span class="Info"> <a href="#">Title Two</a> <span class="Details">Two Point One</span> </span> </span> </li> </ul> CSS: .Container { list-style-type:none; } .Container li { background-color:grey; display:inline; text-align:center; } .Container li .Item { border:solid 2px #ccc; display:inline-block; min-height:50px; vertical-align:top; width:170px; } .Container li .Item .Info { display:inline-block; } .Container li .Item .Info a { display:inline-block; width:160px; } If you check out the result in the jsfiddle link you can see that the grey background only encompasses a small strip of the whole <li>. I know that changing the <li> to display:inline-block solves this problem but that isn't feasible for other reasons. So first of all, I'm just looking to see if anyone understands why the inline <li> element doesn't have any height. I can't find anything in the spec that explains this. I know I can't add height to an inline element but any explanation as to why this is happening that might enable me to fix would be great. Secondly, if you inspect the elements using IE's Developer Mode you will see that although the background color is in the correct location, the actual location of the <li>'s bounding box is at the bottom of the container according to hovering over the element. I could deal with this problem if it was at the top in every browser but it apparently varies. NOTE: I don't really care about older browsers in this case but I don't use HTML5 or JavaScript positioning. Thanks.

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• Urlscan 3.1 block User Agent

  - by Benjamin

  I need to block requests from certain User Agents to our Sharepoint Environment that have been identified after going through the IIS logs. I have tried the below by amending the urlscan.ini config file and doing and iisreset, but it doesn't block anything. Am I entering the correct strings? I'm copying user agent string from the iis logs http://blogs.msdn.com/rakkimk/archive/2009/06/12/urlscan-rejecting-the-request-depending-on-the-user-agent-string.aspx

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• Block UI untill a page has fully loaded : jquery, blockUI plugin

  - by Kunal Mukherjee

  How can I block the UI when the page is still loading using jquery and blockUI plugin? If the page was being loaded using an AJAX call I know the workaround, but when the page is loading with a postback, then how to block the ui until the page has finished loading completely? Please help. Many thanks in advance for your effort and time.

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