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  • Anti-DDoS Question

    - by Andre
    Our company´s main owner (telecon group) wants us to deploy anti-DDoS mechanisms, such as Arbor Pravail, which is a great idea. Although... I have a question... If our main ISP Backbone provider have no anti-DDoS mechanism, means that there is no point we get the Arbor Pravail? An DDoS attack can make damage uniquely the destination IP or to the whole network that the DDoS packets go through? Regards,

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  • Powershell or WMI to pull Printer Properties and Additional Drivers?

    - by JeremiahJohnson
    What I am trying to accomplish: Use a powershell script (WMI or cmdlets directly, or a combination) to query a 2003 or 2008 server with the PrintServer role, enumerate the printers shared, then list the drivers in use for that printer and specifically if an x86 or x64 driver is being used (or both). I've looked at Win32_Printer, Win32_PrinterDriver, Get-Printer, etc. None of these seem to be able to tell me about x64 drivers or when multiple platform-specific drivers are loaded. Something like: gwmi win32_printer -computername lebowski | %{$name = $_.name $supported = $_.getrelated('Win32_PrinterDriver') | select supportedplatform, driverpath, version Write-Host $name return $supported } Produces the following: PCLOADLETTER supportedplatform : Windows NT x86 driverpath : C:\WINDOWS\system32\spool\DRIVERS\W32X86\3\RIC54Dc.DLL version : 3 However the problem being that particular printer also has x64 drivers loaded. I really don't want to manually check the properties tab of 100 printers just to see if they have the x64 driver loaded.

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  • Linux: setting up an elite/high-anonimity Web proxy on a dedicated server

    - by YellowSquirrel
    I'm renting a dedicated server which I'd like to use to "surf the Web": basically I want to always surf the Web from the same static IP (the one of my dedicated server). I can do it by running Xvnc/FreeNX on the dedicated server, but this is kinda slow and clumsy (I tried it). What are the steps needed to install an "elite/high-anonimity" Web proxy on a dedicated (Debian) Linux server knowing that my two requirements are: I'm the only person that needs access to the proxy all I want is that my broadband (dynamic) IP is completely hidden (I want to always surf from my dedicated server's IP). Note that using the static IP people can find my domains and my real name and I'm perfectly fine with that (actually it is what I want). What I don't want is people knowing from which dynamic IP (broadband) I'm connecting. What are the steps needed to do that? (basically I don't care about "anonimity", what I want is to appear to surf from a static IP and I think I need what is called an "elite" Web proxy to do that, but I'm not sure) Technical infos and sample configuration most welcome :)

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  • SQL 2008 SP2 RsClientPrint ActiveX - "Unable to load client print control"

    - by Miles
    We recently updated our SQL 2008 server to use SP 2 and its causing a few headaches. We use SSRS on this server and when a client tries to print a report by the built-in print function, we're needing to download the RsClientPrint ActiveX control from the server from the client gets the following error Unable to load client print control. We have about 700 computers that are needing this fixed and I've followed the instructions found on the following URL: http://www.kodyaz.com/articles/client-side-printing-silent-deployment-of-rsclientPrint.aspx We have two issues: Most of the users who will be using this ActiveX control are not local administrators so they will not be able to install the control themselves Since there are so many computers, this has to be done silently behind the scenes run by a local admin account After following the information from the link above, we're able to put the files in the C:\Windows\System32 folder and register the DLL but we still get the same problem. The only small thing I've noticed is that in the HTML for the report page, everything that references a version is referencing version 2007.100.4000.00 and the version of the DLL that I pulled from the report server is 2007.100.1600.22. Also, for some clients that are local administrators, they are prompted every time to install the ActiveX control when they click print. This works successfully but we can't have the user asked if they want to install the same control every time they need to print.

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  • lftp make-backup not functioning as expected

    - by Felipe Alvarez
    With default settings, when 'putting' the file, it is clobbered without complaint or warning. When 'getting' lftp complains: get: super.sh: file already exists and xfer:clobber is unset I change my /etc/lftp.conf and append: set xfer:make-backup yes set xfer:clobber yes When putting and getting, the files get clobbered, however no backup is made. I've checked the settings with "set -a | grep clob" and "set -a | grep backup" and the values are correct.

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  • No apache MPM package installed error

    - by Sejanus
    I'm getting "No apache MPM package installed" when trying to configure virtual hosts on apache2.2. I compiled apache2.2 from source and I did not use --with-mpm=NAME option. I thought it will compile with default one then. So the question is, is there any way to check if MPM is installed indeed and I only need to enable it somewhere? If it is not, is there any way to add it without recompiling apache? Or, is there any way to have virtual hosts without it at all? I was doing vhost configuration as per this example. Thanks in advance for your help ;) EDIT: prefork is installed. The question is, why after a2ensite / a2dissite and /etc/init.d/apache2 reload I still get error "No MPM package installed"...

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  • APC fragmention woes on Apache AWS EC2 Small instance with WordPress and W3TC

    - by two7s_clash
    AWS EC2 Small instance, Apache 2 running WordPress and W3TC. Within an hour, my APC fragmentation hits 100%. My APC settings are: apc.enabled = 1 apc.shm_segments = 1 apc.shm_size = 100M apc.optimization = 0 apc.num_files_hint = 512 apc.user_entries_hint = 1024 apc.ttl = 7200 apc.user_ttl = 7200 apc.gc_ttl = 3600 apc.cache_by_default = 1 apc.use_request_time = 1 apc.filters = "apc\.php$" apc.mmap_file_mask = "/tmp/apc.XXXXXX" apc.slam_defense = 0 apc.file_update_protection = 2 apc.enable_cli = 0 apc.max_file_size = 2M apc.stat = 1 apc.write_lock = 1 apc.report_autofilter = 0 apc.include_once_override = 0 apc.rfc1867 = 0 apc.rfc1867_prefix = "upload_" apc.rfc1867_name = "APC_UPLOAD_PROGRESS" apc.rfc1867_freq = 0 apc.localcache = 0 apc.localcache.size = 256M apc.coredump_unmap = 0 apc.stat_ctime = 0 apc.canonicalize = 1 apc.lazy_functions = 0 apc.lazy_classes = 0 /etc/php.d/apc.ini More poop can be seen here. Mostly cribed settings from here. The shm was meant to be whittled down from such a high value after some observation, but apparently such a large value isn't even high enough.... I found an similar question/answer here. I do have some virtual hosts setup, but they aren't being touched much at all. Having users logged into the admin panel of WP does make things worse, but that's certainly not the main culprit. The question asker seems to suggest that it turns out W3TC is probably causing the problem, which the plugin author seems to agree with, but there aren't any helpful details beyond that. Why is it causing the problem? Do I just take it for now and turn off object caching with APC? Is there nothing I can do? Does having it turned on without being used for object caching actually help anything? Would memcache be an ok substitute just for object caching here? Finally, maybe I just shouldn't worry so much about the fragmentation?

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  • Windows Server 2008 Stops Responding (Hyper-V Role Enabled)

    - by blackf0rk
    The machine is a brand new Dell Precision m6500, Core i5, 8GB RAM. Windows Server 2008 R2 (fully patched) with Hyper-V Role Enabled. Virtualization options in the BIOS are ON, SpeedStep is OFF, couldn't find C1E option in the BIOS to turn it off (I also got the impression that SpeedStep is C1E, but the Intel Product site lists them as separate "features." shrug) The server stops responding without any apparent reason. I've tried testing in multiple scenarios, all of which result in a crash at seemingly random times: With the Server sitting idle, no apps running. Server sitting idle with a Virtual Machine running. Using a BurnInTest application There's no blue screen. It doesn't restart. The screen just sits there. The keyboard backlight still responds and comes on with input, but nothing on the screen changes. There are no errors in the error log. I have to hold down the power button to turn it off. Doing memory tests on bootup results in no errors with the memory. I have a second identical system and the same thing happens there too. I've dual-booted into Windows 7 Profession x64 on this system with no problems. Further testing has shown that the issue is definitely related to Windows Server 2008 R2 and Hyper-V as it appears the crashing does not happen when the services are not running. I've installed all hotfixes relating to this issue (that I could find): 975530, 979444, 979491, 976427 System is still crashing without response.

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  • How to tell if mod_deflate is actually working?

    - by Jayraj
    I have put the following in my http.conf file: # mod_deflate configuration <IfModule mod_deflate.c> # Restrict compression to these MIME types AddOutputFilterByType DEFLATE text/plain AddOutputFilterByType DEFLATE text/html AddOutputFilterByType DEFLATE application/xhtml+xml AddOutputFilterByType DEFLATE text/xml AddOutputFilterByType DEFLATE application/xml AddOutputFilterByType DEFLATE application/x-javascript AddOutputFilterByType DEFLATE text/javascript AddOutputFilterByType DEFLATE text/css # Level of compression (Highest 9 - Lowest 1) DeflateCompressionLevel 9 # Netscape 4.x has some problems. BrowserMatch ^Mozilla/4 gzip-only-text/html # Netscape 4.06-4.08 have some more problems BrowserMatch ^Mozilla/4\.0[678] no-gzip # MSIE masquerades as Netscape, but it is fine BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html <IfModule mod_headers.c> # Make sure proxies don't deliver the wrong content Header append Vary User-Agent env=!dont-vary </IfModule> </IfModule> My content doesn't return with a Content-Encoding of type gzip, but I find myself getting a lot more 304s and the Etag is appended with a +gzip suffix. Is mod_deflate actually doing its job? (Sorry about the n00b-ishness)

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  • CheckPoint Endpoint Security VPN client co-existing with Windows VPN

    - by Nils
    Hey guys, I work as a consultant for a firm with a Checkpoint firewall. I have downloaded and installed the Checkpoint Endpoint Security VPN client. During the installation, I answered no to any questions pertaining firewall etc. - I just wanted the VPN client itself. However, after the installation, I am no longer able to use any of my pre-existing Windows VPN client connections. It does not matter whether the Checkpoint UI is running or not - shutting down the client does not fix the problem. Uninstalling Checkpoint VPN on the other hand fixes the problem. Does anyone know if it is possible to have both VPN clients work while being installed simultaneously? I don't need them to stay connected simultaneously, just avoiding to install/uninstall the Checkpoint client every time I have to use it is perfectly good. Thanks!

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  • Cygwin sshd on Windows 7 issue

    - by Murali
    Using an administrator privileged account I have installed cygwin sshd following instructions here successfully on Windows XP, Vista, but on Windows 7, after installation without errors when I try to start the service ... net start sshd The CYGWIN sshd service is starting. The CYGWIN sshd service could not be started. The service did not report an error. More help is available by typing NET HELPMSG 3534. Has anyone seen this error, got any ideas on what might be wrong?

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  • OpenVPN slow with Firewall enabled on Zyxel ZyWall USG-100

    - by aleroot
    I have an OpenVPN server on a Linux machine, after installing a ZyWall USG-100 I'm experiencing extremely slowness navigating web servers on my remote LAN through the VPN connection, while accessing the web interface of the ZyWall is fast. I have configured everything : the Virtual Server for the OpenVPN Server, the static route as with the replaced router that I had before installing the ZyWall Today. I even added a rule to the firewall that allows connection to the OpenVPN Server machine : but navigation on the LAN through the VPN still slow, it seems that the Firewall is blocking packages, since if I disable the firewall on the USG-100 everything works fast as usual, while with the firewall enabled it is extremely slow. Why ? Do I need to add some other rule to the firewall to speed up ?

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  • VPN with wrong subnet mask

    - by Philipp Schmid
    I followed these instructions on www.hottonetworking.com to set up VPN on a clean install of Windows Server 2008 SP2 (not R2 yet). When I then establish a VPN connection to that machine from a client machine (running Windows 7 RC), everything succeeds (it seems since I get a 'Connected' state in the network sharing center window), but I end up with a subnet mask (according to ipconfig /all) of 255.255.255.255 instead of 255.255.255.0. The net effect is that I don't have local network or internet capability. What additional configuration steps do I have to do to get VPN with the proper subnet mask working? Update: Using the steps outlined in the Technet article mentioned by Mr. Nimble, I was able to get internet connection. Apparently the subnet mask is not an issue as my coworker was able to connect using his VPN connection and ping the server machine by name as well.

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  • Postfix/SMTPD Relay Access Denied when sending outside the network

    - by David
    I asked a very similar question some 4 or 5 months ago, but haven't tracked down a suitable answer. I decided to post a new question so that I can ... a) Post updated info b) post my most current postconf -n output When a user sends mail from inside the network (via webmail) to email addresses both inside and outside the network, the email is delivered. When a user with an email account on the system sends mail from outside the network, using the server as the relay, to addresses inside the network, the email is delivered. But [sometimes] when a user connects via SMTPD to send email to an external address, a Relay Access Denied error is returned: Feb 25 19:33:49 myers postfix/smtpd[8044]: NOQUEUE: reject: RCPT from host-68-169-158-182.WISOLT2.epbfi.com[68.169.158.182]: 554 5.7.1 <host-68-169-158-182.WISOLT2.epbfi.com[68.169.158.182]>: Client host rejected: Access denied; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<my-computer-name> Feb 25 19:33:52 myers postfix/smtpd[8044]: disconnect from host-68-169-158-182.WISOLT2.epbfi.com[68.169.158.182] Sending this through Microsoft Outlook 2003 generates the above log. However, sending through my iPhone, with the exact same settings, goes through fine: Feb 25 19:37:18 myers postfix/qmgr[3619]: A2D861302C9: from=<[email protected]>, size=1382, nrcpt=1 (queue active) Feb 25 19:37:18 myers amavis[2799]: (02799-09) FWD via SMTP: <[email protected]> -> <[email protected]>,BODY=7BIT 250 2.0.0 Ok, id=02799-09, from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as A2D861302C9 Feb 25 19:37:18 myers amavis[2799]: (02799-09) Passed CLEAN, [68.169.158.182] [68.169.158.182] <[email protected]> -> <[email protected]>, Message-ID: <[email protected]>, mail_id: yMLvzVQJloFV, Hits: -9.607, size: 897, queued_as: A2D861302C9, 6283 ms Feb 25 19:37:18 myers postfix/lmtp[8752]: 2ED3A1302C8: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=6.6, delays=0.25/0.01/0.19/6.1, dsn=2.0.0, status=sent (250 2.0.0 Ok, id=02799-09, from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as A2D861302C9) Feb 25 19:37:18 myers postfix/qmgr[3619]: 2ED3A1302C8: removed Outgoing Settings on Outlook 2003 match the settings on my iPhone: SMTP server: mail.my-domain.com Username: My full email address Uses SSL Server Port 587 Now, here's postconf -n. I realize the "My Networks" Parameter is a bit nasty. I have these IP addresses in here for just this reason, as others have been complaining of this problem too: alias_database = hash:/etc/postfix/aliases alias_maps = $alias_database append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes command_directory = /usr/sbin config_directory = /etc/postfix content_filter = amavisfeed:[127.0.0.1]:10024 daemon_directory = /usr/libexec/postfix debug_peer_level = 2 disable_vrfy_command = yes html_directory = no inet_interfaces = all mail_owner = postfix mail_spool_directory = /var/spool/mail mailbox_size_limit = 0 mailq_path = /usr/bin/mailq manpage_directory = /usr/share/man message_size_limit = 20480000 mydestination = $myhostname, localhost, localhost.$mydomain mydomain = my-domain.com myhostname = myers.my-domain.com mynetworks = 127.0.0.0/8, 74.125.113.27, 74.125.82.49, 74.125.79.27, 209.85.161.0/24, 209.85.214.0/24, 209.85.216.0/24, 209.85.212.0/24, 209.85.160.0/24 myorigin = $myhostname newaliases_path = /usr/bin/newaliases queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES receive_override_options = no_address_mappings recipient_delimiter = + relay_domains = $mydestination sample_directory = /usr/share/doc/postfix-2.3.3/samples sendmail_path = /usr/sbin/sendmail setgid_group = postdrop smtp_bind_address = my-primary-server's IP address smtpd_banner = mail.my-domain.com smtpd_helo_required = yes smtpd_sasl_auth_enable = yes smtpd_sasl_path = private/auth smtpd_sasl_type = dovecot smtpd_tls_auth_only = yes smtpd_tls_cert_file = /etc/ssl/mailserver/postfix.pem smtpd_tls_key_file = /etc/ssl/mailserver/private/postfix.pem smtpd_tls_loglevel = 3 smtpd_tls_received_header = no smtpd_tls_session_cache_timeout = 3600s smtpd_use_tls = yes tls_random_source = dev:/dev/urandom unknown_local_recipient_reject_code = 554 virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.cf,mysql:/etc/postfix/mysql-email2email.cf virtual_gid_maps = static:5000 virtual_mailbox_base = /var/vmail virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf virtual_minimum_uid = 5000 virtual_transport = dovecot virtual_uid_maps = static:5000 If anyone has any ideas and can help me finally solve this issue once and for all, I'd be eternally grateful.

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  • Can connect through Watchguard mobile VPN, but can't ping or access network drives

    - by johnnyb10
    We're having any issue in which some of our employess can no longer connect to our network drives when out of the office. We use Watchguard Mobile VPN (we have a Watchguard Firebox firewall) and the users are able to connect. That is, their status in the the VPN client says "Connected" and they have the correct IP address listed as the VPN Endpoint. The problem is, when they try to map drives, or even ping the IP address of a server on our network, it fails. Last week, we temporarily switched one of our Comcast modems to our backup DSL modem because the Comcast was accidentally shut off by Comcast, and the problem seemed to start around then. We've since switched back and the problem persists, so that doesn't seem to have been it (which makes sense). But we also made other changes at the time that might have thrown something off, although we feel like we've checked them all. Plus, some people can successfully connect to network drives through the VPN. Can someone please suggest some steps to help troubleshoot? We've checked the policies on our Watchguard box, and they seem fine. We've looked at the settings on the Mobile VPN client, but nothing seems like a probable cause. Thanks.

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  • How to calculate CPU % based on raw CPU ticks in SNMP

    - by bjeanes
    According to http://net-snmp.sourceforge.net/docs/mibs/ucdavis.html#scalar_notcurrent ssCpuUser, ssCpuSystem, ssCpuIdle, etc are deprecated in favor of the raw variants (ssCpuRawUser, etc). The former values (which don't cover things like nice, wait, kernel, interrupt, etc) returned a percentage value: The percentage of CPU time spent processing user-level code, calculated over the last minute. This object has been deprecated in favour of 'ssCpuRawUser(50)', which can be used to calculate the same metric, but over any desired time period. The raw values return the "raw" number of ticks the CPU spent: The number of 'ticks' (typically 1/100s) spent processing user-level code. On a multi-processor system, the 'ssCpuRaw*' counters are cumulative over all CPUs, so their sum will typically be N*100 (for N processors). My question is: how do you turn the number of ticks into percentage? That is, how do you know how many ticks per second (it's typically — which implies not always — 1/100s, which either means 1 every 100 seconds or that a tick represents 1/100th of a second). I imagine you also need to know how many CPUs there are or you need to fetch all the CPU values to add them all together. I can't seem to find a MIB that gives you an integer value for # of CPUs which makes the former route awkward. The latter route seems unreliable because some of the numbers overlap (sometimes). For example, ssCpuRawWait has the following warning: This object will not be implemented on hosts where the underlying operating system does not measure this particular CPU metric. This time may also be included within the 'ssCpuRawSystem(52)' counter. Some help would be appreciated. Everywhere seems to just say that % is deprecated because it can be derived, but I haven't found anywhere that shows the official standard way to perform this derivation. The second component is that these "ticks" seem to be cumulative instead of over some time period. How do I sample values over some time period? The ultimate information I want is: % of user, system, idle, nice (and ideally steal, though there doesn't seem to be a standard MIB for this) "currently" (over the last 1-60s would probably be sufficient, with a preference for smaller time spans).

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  • How does a web server/the http protocol handle version control and compression?

    - by Sune Rasmussen
    When a client browser requests a file from the web server, I know that some kind of check is performed, because the files needed to serve the web page may already be cached by the web browser. So, if a file exists in the cache, no files are sent. But if the file on the server has changed since the file was cached in the browser, the file is sent and updated anyhow. Then, if you have compression like gzipping enabled on the server, the files that are to be provided to the client must be gzipped on the way, requiring some amount of server side processing. But how is this managed? The logical approach seems to me, that the web server should have a cache as well, containing the newest version of all files that have been requested within a certain time span, thus a compressed version of these files, so that compression would not have to be done each time a files is requested. And also, how are files eventually requested? Does the browser ask for files, each time it encounters one in the HTML code and the specific file is not stored in the local cache, or does it sum all the files that are needed up and ask for the whole bunch at the same time? But that's only guessing from a programming point of view, and I don't really know. If the answers are very different among web server systems, I'm primarily interested in Apache, but other answers are appreciated, too.

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  • Cisco ASA Act as a Hardware Security Module?

    - by Derek
    Hello, We have a partner that is requiring us to get a HSM for a web application that we host for them. This is something new for us, we've always installed our SSL certificates on our web servers and never needed a hardware device. We currently have 2 Cisco ASA 5510 firewalls in an active/standby configuration. Both ASAs have a ASA-SSM-10 security module installed in them. The web application is a standard HTTPS webpage with no authentication required. I was wondering if we could use our Cisco ASAs to meet this requirement or if we'll have to buy another device. I was doing some searching and read about Cisco's clientless webvpn feature. It sounds like it might work, but I'm not sure. We basically want the ASA to handle the SSL and proxy the connection to our web servers. We do not want to prompt for a username or password to connect or show any portals, just display the web page. If the ASA cannot do this, does any one have any recommendations for network attached hardware security modules? We are using VMware vCenter, so we'd rather have an external device attached to the network, rather than buying HSM cards for every ESXi host. Thanks, Derek

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  • Ethernet switch capacity question

    - by Andrew Queisser
    We're looking at hooking up 48 small embedded systems with 10/100 Ethernet ports to an Ethernet switch and then have that switch talk to a server upstream via a faster connection. I have a couple of questions about that scenario: What kind of upstream connection is best (fiber, other?) Would it be reasonable to download 1GB/hour from each of the 48 systems concurrently? We'd be using some kind of TCP based protocol of our own design. Thanks, Andrew

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  • Minimizing SQL transaction log file size on developer box running simple recovery model

    - by Anders Rask
    We have alot of SQL servers on development environment where we never take backup of the databases (TFS for code is enough). The (SharePoint) databases are all set to simple recovery model, but the log files, especially for the SharePoint configuration database is growing quite large and filling up our data drive on the SQL server. Since these log files are never used for anything, i would like advice on how to best minimize the size of these log files -or even disable them if possible. I'm not completely sure why the log files grow so large even on simple logging (checked for long running transactions (DBCC OPENTRAN) but found none). I guess the reason for the log files not being truncated is, that we dont take any backups, and hence Checkpoints arent reached. The autogrowth for log files are set to autogrow by 10% restricted to 2 gb, so i guess that is why Checkpoint (70%) arent reached here either. What would be the be best strategy to keep log files small (best case 0) without sacrificing performance (eg VLF fragmentation)?

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  • Setting up Github post-receive webhook with private Jenkins and private repo

    - by Joseph S.
    I'm trying to set up a private GitHub project to send a post-receive request to a private Jenkins instance to trigger a project build on branch push. Using latest Jenkins with the GitHub plugin. I believe I set up everything correctly on the Jenkins side because when sending a request from a public server with curl like this: curl http://username:password@ipaddress:port/github-webhook/ results in: Stacktrace: net.sf.json.JSONException: null object which is fine because the JSON payload is missing. Sending the wrong username and password in the URI results in: Exception: Failed to login as username I interpret this as a correct Jenkins configuration. Both of these requests also result in entries in the Jenkins log. However, when pasting the exact same URI from above into the Github repository Post-Receive URLs Service Hook and clicking on Test Hook, absolutely nothing seems to happen on my server. Nothing in the Jenkins log and the GitHub Hook Log in the Jenkins project says Polling has not run yet. I have run out of ideas and don't know how to proceed further.

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  • swapping or thrashing with vast amounts of unmapped pagecache

    - by Marco
    EDIT: I noticed that this is more appropriate for superuser.com, I apologize. I don't know how to delete this question. I'm using kubuntu jaunty (i386 32bit), kernel 2.6.28-13-generic. I've 4Gb of RAM, of which only 3317Mb are seen by the system (I guess because of the 32bit system). I'm seeing that the pagecache utilization is continually growing, up to the point that the system is unusable (after a few days). This happens also when I don't do anything (all user applications closed and the bare minimum of services enabled). If enabled, the system starts to use swap space (using it all in the end). Even if swap is disabled, disk activity becomes continuous, with the system unresponsive. For example, right now the system is working (albeit a tad slow), with only firefox and wing ide running, and I have 2Gb cached with only 45Mb mapped: $ free total used free shared buffers cached Mem: 3346388 3247328 99060 0 8416 2117980 -/+ buffers/cache: 1120932 2225456 Swap: 2144668 519448 1625220 $ cat /proc/meminfo MemTotal: 3346388 kB MemFree: 97128 kB Buffers: 7872 kB Cached: 2120224 kB SwapCached: 413860 kB Active: 2304596 kB Inactive: 865984 kB Active(anon): 2279168 kB Inactive(anon): 830236 kB Active(file): 25428 kB Inactive(file): 35748 kB Unevictable: 32 kB Mlocked: 32 kB HighTotal: 2492940 kB HighFree: 5456 kB LowTotal: 853448 kB LowFree: 91672 kB SwapTotal: 2144668 kB SwapFree: 1625244 kB Dirty: 84 kB Writeback: 0 kB AnonPages: 629304 kB Mapped: 45768 kB Slab: 45600 kB SReclaimable: 21756 kB SUnreclaim: 23844 kB PageTables: 4468 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 3817860 kB Committed_AS: 3735020 kB VmallocTotal: 122880 kB VmallocUsed: 9352 kB VmallocChunk: 66600 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 4096 kB DirectMap4k: 16376 kB DirectMap4M: 888832 kB If I try to drop the caches, little happes: # sync ; echo 3 > /proc/sys/vm/drop_caches ; free total used free shared buffers cached Mem: 3346388 3220580 125808 0 3020 2100600 -/+ buffers/cache: 1116960 2229428 Swap: 2144668 519356 1625312 Right now I've vm.swappiness = 5, but I've tried also with 0 and 1 (without noticeable differences). I've also tried vm.vfs_cache_pressure = 50 and 150 (again, no differences). As I said the pagecache eats all memory even with swapping turned off. What is happening? How to avoid this? TIA, Marco

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  • what should be limit to use for IPTABLE rate limiting for a webserver

    - by Registered User
    I see on my webserver some logs as follows 203.252.157.98 - :25:02 "GET //phpmyadmin/ HTTP/1.1" 404 393 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:03 "GET //phpMyAdmin/ HTTP/1.1" 404 394 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:03 "GET //pma/ HTTP/1.1" 404 388 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:04 "GET //dbadmin/ HTTP/1.1" 404 391 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:05 "GET //myadmin/ HTTP/1.1" 404 391 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:06 "GET //phppgadmin/ HTTP/1.1" 404 394 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:06 "GET //PMA/ HTTP/1.1" 404 389 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:07 "GET //admin/ HTTP/1.1" 404 389 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :25:08 "GET //MyAdmin/ HTTP/1.1" 404 392 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :27:36 "GET //phpmyadmin/ HTTP/1.1" 404 393 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :27:42 "GET //phpMyAdmin/ HTTP/1.1" 404 394 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :27:42 "GET //pma/ HTTP/1.1" 404 388 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - :27:43 "GET //dbadmin/ HTTP/1.1" 404 391 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" 203.252.157.98 - - "GET //myadmin/ HTTP/1.1" 404 391 "-" "Made by ZmEu @ WhiteHat Team - www.whitehat.ro" and some more as follows 118.219.234.254 - - [19/Oct/2010:22:57:41 "GET /pma/scripts/setup.php HTTP/1.1" 404 399 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:41 "GET /scripts/setup.php HTTP/1.1" 404 397 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:42 "GET /sqlweb/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:42 "GET /web/phpMyAdmin/scripts/setup.php HTTP/1.1" 404 408 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:43 "GET /web/phpmyadmin/scripts/setup.php HTTP/1.1" 404 408 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:44 "GET /web/scripts/setup.php HTTP/1.1" 404 400 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:44 "GET /webadmin/scripts/setup.php HTTP/1.1" 404 403 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:45 "GET /webdb/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:22:57:45 "GET /websql/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:51 "GET /admin/phpmyadmin/scripts/setup.php HTTP/1.1" 404 407 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:52 "GET /admin/pma/scripts/setup.php HTTP/1.1" 404 404 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:52 "GET /admin/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:53 "GET /db/scripts/setup.php HTTP/1.1" 404 399 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:54 "GET /dbadmin/scripts/setup.php HTTP/1.1" 404 402 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:54 "GET /myadmin/scripts/setup.php HTTP/1.1" 404 403 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:55 "GET /mysql/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:55 "GET /mysqladmin/scripts/setup.php HTTP/1.1" 404 405 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:56 "GET /phpMyAdmin/scripts/setup.php HTTP/1.1" 404 405 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:56 "GET /phpadmin/scripts/setup.php HTTP/1.1" 404 403 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:57 "GET /phpmyadmin/scripts/setup.php HTTP/1.1" 404 404 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:57 "GET /pma/scripts/setup.php HTTP/1.1" 404 399 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:58 "GET /scripts/setup.php HTTP/1.1" 404 397 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:58 "GET /sqlweb/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:59 "GET /web/phpMyAdmin/scripts/setup.php HTTP/1.1" 404 408 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:38:59 "GET /web/phpmyadmin/scripts/setup.php HTTP/1.1" 404 408 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:39:00 "GET /web/scripts/setup.php HTTP/1.1" 404 400 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:39:01 "GET /webadmin/scripts/setup.php HTTP/1.1" 404 403 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:39:01 "GET /webdb/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 118.219.234.254 - - [19/Oct/2010:05:39:02 "GET /websql/scripts/setup.php HTTP/1.1" 404 401 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" I have 2 questions 1) When such an attack happens on my site then while such scanning is going on how do I detect it? (In a very less time) 2)I have decided to rate limit the IPTABLES so as to reduce such DOS attacks by some script kiddies (to scan for vulnerabilities in phpmyadmin or some other script) to some extent.So how much should it be limited so that genuine users do not get kicked out.What is the best practise for question 2?

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