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• Is this one network or two networks?

  - by colemik

  I have this simple question and really don't know the answer. Does the drawing below show one network or two networks? This is a question about the definition of a network from the OSI / TCP/IP model point of view: From one point of view, those are two L2 networks connected with a bridge. From another point of view, this is one L3 network, that can have a common L3 address space (like 10.1.1.0). PS If this question is too dumb, please move it to Superuser.

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• What is the network address (x.x.x.0) used for?

  - by Shtééf

  It appears to be common practice to not use the first address in a subnet, that is the IP 192.168.0.0/24, or a more exotic example would be 172.20.20.64/29. The ipcalc tool I frequently use follows the same practice: $ ipcalc -n -b 172.20.20.64/29 Address: 172.20.20.64 Netmask: 255.255.255.248 = 29 Wildcard: 0.0.0.7 => Network: 172.20.20.64/29 HostMin: 172.20.20.65 HostMax: 172.20.20.70 Broadcast: 172.20.20.71 Hosts/Net: 6 Class B, Private Internet But why is that HostMin is not simply 64 in this case? The 64 address is a valid address, right? And whatever the answer, does the same apply to IPv6? Perhaps slightly related: it also appears possible to use a TCP port 0 and an UDP port 0. Are these valid or used anywhere?

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• Asterisk is hacking itself [duplicate]

  - by Shirker

  This question already has an answer here: How do I deal with a compromised server? 11 answers I've got some strange logs on my asterisk (and there a lot of extensions were tried): chan_sip.c: Failed to authenticate device 6006<sip:[email protected]>;tag=f106f3fe but IP XX.XX.XX.39 is its OWN IP! cat /etc/asterisk/* | grep 6006 returns nothing. asterisk -rv Asterisk 11.4.0 How its possible, that its hacks itself? And how could I trace, where it comes from?

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• In OpenOffice Spreadsheet, how can I set the default Date format?

  - by Joe Casadonte

  I'm using OO 3.1.1 on Ubuntu 9.10 (in case that matters to the answer). I like my dates to appear as YYYY-MM-DD. I can't think of a time when I want to see a date in any other format, so I'm constantly changing how dates look. That's manageable, though annoying. What's gotten me to the point of posting is that when I edit a cell with a date value, I have to edit it in the format MM/DD/YYYY, which is really, really annoying, as I'm usually mucking with the day (or possibly the month), and very seldom the year. So there's lots of cursor or mouse use, wasting my time. So is there a way that I can change how dates are edited, or at least the default display format? Thanks!

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• Why hasn't anyone made a way for TimeMachine to wirelessly backup to Amazon S3?

  - by Jordan

  Seriously. I'm looking at you, Apple. If TimeMachine is supposed to be 'simple backup that just works' why is it impossible to backup into my S3 filespace? Why hasn't some 3rd party developer (JungleDrive???) made it so that TimeMachine will be OK with backing up to amazon s3 storage? It just seems like the most convenient, robust answer. I'd gladly pay the $20-25 a month for complete, unlosable backups that I can sync with wirelessly on a proper scheme.

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• How to disable password change for openldap user?

  - by Keve

  Considering possible solutions for some improvements I run into this theoretical question and I couldn't find a satisfying answer. Some of you may have first-hand experience with this in practice, so here the question goes: How can I disable password changing for an OpenLDAP user? The account must stay enabled, allowed to log on to workstations and work as usual, but should not be able to change its own password. Can this be done? If so, how difficult is it to implement it? All suggestions are appreciated! For reference: Servers and workstations are to run a mixture of FreeBSD and OpenBSD. Accounts to get password disabled are student or generic workstation accounts. Environment is a school.

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• Windows 7 search for files with special characters in name.

  - by Luke

  I have a rather large source code repository on my machine; it is not indexed by Windows Search. I am trying to find some oddly-named generated files of the form .#name.extension.version where name and extension are normal names and extensions and version is a numeric value (e.g. something like 1.186). On Windows XP I could find these files by searching for .#*; on Windows 7 that just returns every single file and directory. So my question is this: is it possible to find files named like that using the built-in Windows 7 search functionality? I did find this question which is very similar, but the answer doesn't work for me; it seems like any special character I put in the query is either ignored or treated as a wildcard, and as a result it matches every single file and directory. Is there perhaps some registry value I can set to make the search-by-filename feature work with special characters?

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• Multiple public/private key pairs for the same user

  - by bruceb

  First, sorry if this question has already been asked/answered - I've searched but perhaps I haven't recognised the answer.... What we have is a cluster of servers which need to access a single remote server using sftp. We are migrating from one remote server to another at the same (remote) location. We also want to refresh the public/private key pairs on the configuration as part of an ongoing security review. My question is - can we have multiple public/private key pairs for the same user between server A and server B? I want to do this to allow for cutover testing - but am concerned that the software checking keys may only try one of each type (rsa/dsa?) before rejecting the connection method and moving to the next type of key. Hope it's a straightforward question - please let me know if I need to supply more details. Thanks in advance Bruce

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• Connecting two IPs like an URL

  - by czesuaf

  I haven't found answer anywhere, so here comes the question. My ISP connected me to a router with thousands of other clients, so my public IP is the same as many others. And I want to make a small private server which can be accessible across whole web. So my home router shows me IP 10.x.x.x and actually my public IP is 89.x.x.x. Is there any way to reach the IP 10.x.x.x from the Internet? Yeah I thought the same about IPv6 but it's still not accessible for me ;[

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• How do I run perfmon against a remote machine?

  - by WindyCityEagle

  For starters I'm trying to do this from a Windows 7 box to a Windows 7 box. I know the simple answer should be to enter \\computername where it says "Select Counters From Computer". Trouble is, every time I do that I get an error message that says "Unable to connect to machine" I know the machine is out there and accessible, because I can bring up windows explorer and enter \\computername\c$ in the explorer bar and then can browse their c drive. So the machine is out there. Are there special permissions for perfmon? Is here a service which needs to be running on the remote machine?

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• Nginx config with try_files and rewrite : precedence?

  - by Penegal

  Good morning, everybody. Firstly, this question may have been already asked, but I searched ServerFault during about 15 minutes without finding it, so, if it was already asked, please accept my apologies. I'm trying to rationalize my Nginx server config, but I have a rather dumb question that I couldn't solve, even with extensive Web search, except if I totally f*cked my search. Here is the question : is try_files parsed before or after rewrite ? Asked differently, Do I have to put try_files after all rewrite directives, or is Nginx config parser smart enough to evaluate try_files after all relevant rewrite directives ? The link with the config rationalization is that the answer to this question will change the organisation of the config, ie if config file order of try_files and rewrite changes the config behaviour, it will force me to disperse my includes, some of them containing try_files and other ones containing rewrite, because I also have rewrite directly in nginx.conf. Hoping you can help me, Regards.

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• Automatic Reply Out of Hours

  - by Inbr3d

  Is there a way i can use a rule or "timer" of some sort to turn on out of office, or enable an auto reply for 1 mailbox (Sales mailbox) within a time period. Reason: We deal with all timezones, we only open 6am-8pm. critical sales are sometimes lost the automatic reply will involve a telephone number for emergency sales. (yes, spam i know) I wish the auto reply to come from "[email protected]" if this is possible. I've lokekd at transport rules, cant see anything. I cant word my question well enough for google to give an answer.

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• Running a script on startup before X starts in Ubuntu 9.10

  - by Epcylon

  I have a script that I want to run at startup to switch X-configs depending on location, but I can't seem to find out where to put it in order to get it to run before X is started. This results in me having to restart X to get it to run the correct config. Currently, my script is located in /etc/init.d/whereami, with symlinks in /etc/rc[2-5].d/S25whereami. I was trying to find out when X is started, in case the problem is simply the 25, but I can't seem to find the answer... Any help is appreciated.

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• Can I move a copy of Windows 7 from one machine to another?

  - by Chopper3

  This is a pretty basic question sorry but I've looked in the 'related questions' and couldn't find an answer. When Windows 7 came out I bought a copy of Home Premium, the retail box with both 32 and 64 bit versions, to install via Boot Camp on my macbook. I've just got a retail (32 and 64 bit) copy of Windows 7 Ultimate that I'd like to install instead-of/over the Home Premium version and it struck me that I should, at least in principal be able to install the Home Premium version on my son's machine - is this the case and if so is there anything I should do first or once they're installed to let MS know I'm being a good guy about this? Sorry it's such a dim question but I'm a serverfault guy really and know very little about Windows. Thanks.

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• Logins with only HTTP - are they as insecure as I'm thinking?

  - by JoeCool1986

  Recently I was thinking about how websites like gmail and amazon use HTTPS during the login process when accessing your account. This makes sense, obviously, since you're typing in your account username and password and you would want that to be secure. However, on Facebook, among countless other websites, their logins are done with simple HTTP. Doesn't that mean that my login name and password are completely unencrypted? Which, even worse, means that all those people who login to their facebooks (or similar sites) at a wifi hotspot in public are susceptible to anyone getting their credentials using a simple packet sniffer (or something similar)? Is it really that easy? Or am I misunderstanding internet security? I'm a software engineer working on some web related stuff, and although at the current time I'm not too involved with the security aspect of our software, I knew I should probably know the answer to this question, since it's extremely fundamental to website security. Thanks!

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• Which browser is the most secure? (research and practically based)

  - by wag2639

  I was wondering which browser is the most secure today, Firefox, Internet Explorer, Chrome, or Safari on a Windows machine with the user running as a Power User/Administrator account. This is not a question about which browser is the best because its the most usable, but more of a question if asked for security, which browser is the most secure given an everyday user's experience (JavaScript, Flash, Ads, etc). Also, would the choice for most secure change if the user was running as a restricted user? To clarify, I'm looking for an answer that's based in research on potential and common exploits and how long it takes for critical problems to be patched.

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• Cleaning cruft from the stored configs database

  - by Zoredache

  I have setup stored configuration primarily as a method to manage my ssh known_hosts. Unfortunately as I retire hosts the old configs still exist in my database. The answer seems to be run the command puppet node clean <hostname>. The problem is that while this does command does run, and does clean up some data, it doesn't seem to clean up everything. For example I can still find values in the puppet_tags table that only applied to a hosts that no longer exists. What should I be doing to keep my stored configuration database clean of all extra junk that seems to be building up? P.S. Can anyone point me any documentation for the stored configuration schema?  If I could find good documentation, or at least an entity-relationship-diagram, I would be tempted to just do some manual clean-up.

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• Have two partitions in RAID1

  - by mateikav

  The answers are unclear wherever I look. I have two 2TB drives for a RAID1 and I want to mirror them while having two partitions on the drives. One partition will be 100GB and contain programs, the other partition will be 1.8TB and contain personal files. Some may ask why? The answer is that my programs are currently on another older drive and I want to save time and pain uninstalling and re-installing critical programs while merely copying them to the new drives via Shadowcopy. When I create the RAID1, will both partitions be mirrored? Is this possible? I am sorry if I am being confusing or unclear.

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• Use backups if unavailable (not just down)

  - by PriceChild

  Using haproxy, I want: A pool of 'main' servers and 'backup' servers, though they don't necessarily have to be in separate pools. Each backend has a low 'maxconn' (in this case 1) Clients should not wait in a queue. If there are no immediately available servers in the 'main' pool they should be shunted to the 'backup' pool without delay. Right now I have one backend, 'main' servers have an absurdly high weighting and it 'works'. acl use_backend + connslots is along the right lines but without the patch in my own answer it isn't perfect. Bonus points for not requiring a modified haproxy binary.

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• How do I backup (from Vista Home Premium) to a FAT32 HDD connected to a wireless router with no user account or password set?

  - by Scubadooper

  I have a Seagate expansion 2TB HDD which I've managed to get working on my wireless router (thanks to fat32format) however I haven't managed to set my backup to work with it. Vist Home Premium requires that I input a username and password in the backup utility. As far as I'm aware that type of access control isn't set on the HDD: Can I set up the access control on the HDD? If so how Or, can I set the backup to work without it? If so how Thanks for your help, I haven't been able to find the answer anywhere on the net so far

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• Can I proxy my no-ip domain using a .htaccess file on my hosted domain?

  - by Dean

  I have a domain http://www.example.com which has a hosting package and website on it. I also have a http://example.no-ip.org domain which contains some content I would like to appear under the same domain. Can I setup a .htaccess file at http://www.example.com/proxy/ which proxies the files at http://www.example.no-ip.org/files/ Similarly, could I host an entire domain in the same way?, e.g. http://www.example2.com/ proxying http://example.no-ip.org/files2/ Alternatively, if someone were to say "That's stupid, use this free (or super-cheap) dynamic DNS host:" I would probably accept that answer.

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• Is it possible to cause email to my domain to be handled by gmail?

  - by pitosalas

  [This is a very narrow question, and I don't think it is covered in similar sounding questions] I want to configure my server's DNS so that when someone sends email to [email protected] it is actually deliver it to [email protected] Note: My question is whether this is possible to do ONLY with DNS not with myserver.com's own sendmail. I think the answer is "NO" it is not possible, because when I add an MX record to DNS the email that was delivered to gmail's SMPT server would be TO: [email protected] and it would not know that account. (But I hasten to add that I am just vaguely starting to grok how this all works.)

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• Why my USB mouse get suspended after 3 seconds of inactivity?

  - by Vi.

  Mouse's bottom LED goes off after 3 seconds after connection and cursor movements and wheel stops. Pressing any button, reconnecting or resetting USB device resumes it for another 3 seconds (when resumed by pressing button, this event does no go to X). This happens when using any of USB ports. This mouse works well with other computer with Linux. It was working well before. Why can it happen? How to fix it? Update: It happens only if laptop is on battery. Answer: this is caused by powersaving done by laptop-mode-tools. To temporary turn off powersaving one can use for i in /sys/bus/usb/devices/*/power/control; do echo on > $i; done

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• Can you span a single file share across multiple servers?

  - by Mike C.

  Let's say I have one large file server that has a company-wide share. That file server constantly runs into space issues. Now let's say I have a dozen or so random servers (print servers, web servers, etc) that have a ton of free space. Is there a way to utilize that in the company-wide file share? Like spanning the storage across different servers but making that transparent to the user? I know the likely answer is going to be get more storage for the file server, but I just curious if this is conceptually possible. Thanks!

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• How do I assign a new keyboard shortcut in Excel 2010

  - by PatZ

  I need a keyboard shortcut for Merge & Center. I'd like it to be Ctrl+Shift+M. I am unfamiliar with Macros as was suggested in another answer and when I go to Options, I can't find shortcuts...I tried to follow the Help info, but as was already answered the Excel Customize Ribbon doesn't have the same options that Word 2010 does. So, how do I go about it step by step? I know this is for superuser...and I'm not one...but I hope to be one some day. Please help me on the way. Thanks.

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