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• keepalived questions (requirements, abilities, limitations)

  - by Poni

  1) What are keepalived's (physical/network) requirements? Does the two (or more) keepalived' nodes need to be connected to the same switch? (something related to broadcasting maybe). 2) Can keepalived nodes run on different networks, "internet" networks? 3) Is keepalived depend on the router? (as far as I understand, the virtual IP should point to the real router/switch that connects both nodes). 4) Is keepalived "service-independent"? - What is keepalived's involvement domain? IPs only? Or is it service/protocol oriented? - Does it deal ONLY with IP, or is it designed for HTTP for example? - In other words, can I use it for custom (network-based) app? 5) Have more than one failover server? If the answer for question #4 is "yes", i.e it depends on the service type, then is there any general alternative? Preferably easy to install/configure :)

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• Accept incoming L2TP connections on Windows 7

  - by Greg

  Windows 2003 can be configured as a VPN server that uses L2TP with a preshared key. Windows 7 can be configured to accept incoming VPN connections, presumably using PPTP. Is there a way to configure Windows 7 to accept incoming L2TP connections? The configuration settings for incoming connections is extremely sparse; I don't see any place to enter a preshared key or specify the protocol to use. Perhaps it is beyond the capabilities of Win 7, but I hold out hope that I'm overlooking some Group Policy settings or registry edits that allow it.

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• OpenBSD ftp-proxy behind NAT itself

  - by Manuel Faux

  Is it possible to change the PASV IP ftp-proxy of OpenBSD sends to clients, without changing the listen address of redirection control (-b <address>)? I have the following setup: FTP client --> 1:1 NAT router --> OpenBSD router --> FTP server The 1:1 NAT router has a NAT rule to forward everything to the OpenBSD router, the OpenBSD router runs the ftp-proxy -R <FTP server IP>. When the FTP client sends the PASV command, the proxy answers with the Entering Passive Mode (227) message with his own source IP on the interface to the 1:1 NAT router (obviously). Since the 1:1 NAT router is not protocol aware, it forwards this message and the client receives the message with the PASV IP of the OpenBSD router, which it does not have a route to. Is there a way, that I can tell ftp-proxy to send the Entering Passive Mode message with a different source IP?

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• Public DNS Server fails on Windows Amazon EC2

  - by Adroidist

  I have started a new Windows server instance on Amazon EC2. The security group has the following rules: Ports Protocol Source 22 tcp 0.0.0.0/0 80 tcp 0.0.0.0/0 443 tcp 0.0.0.0/0 3389 tcp 0.0.0.0/0 53 udp 0.0.0.0/0 -1 icmp 0.0.0.0/0 I am able to ping the public DNS server of the machine and i can connect to it using Windows Remote Desktop connection. However, when i put in my web browser the public DNS server, it fails to connect. Morever, I used filezilla and putty (and in both I loaded the private key .pem) but i receive connection timed out. I disabled the firewall on both my pc and the instance (which I entered using Remote desktop connection). Can you please tell me what I am missing?

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• Windows 7 connect to Lion file sharing

  - by McKvack

  Trying to access my Mac from a Windows 7 computer, I fail with the infamous error 86 incorrect password. Now this appears to be a well-known problem with countless threads on the internet giving as many "solutions" as there are discussion threads about it (mostly ranging from installing third-party commercial samba servers, to switching to some other protocol, to compiling a plain-vanilla Samba installation - the latter which I will probably do when I give up this :) ) I am stubborn, and I believe there must be some problem here that can be solved or worked around, but there is surprisingly little detail about this problem. It appears to have something to do with a mismatch of authentication methods. Trying to run samba in debug mode: sudo /usr/sbin/smbd -debug -stdout gets me this output when trying to access it from Win 7 ... smb1_dispatch_one [smb_dispatch.cpp:377] dispatching SMB_COM_SESSION_SETUP_ANDX smb1_dispatch_session_setup [session_setup.cpp:261] FIXME erase existing sessions log_gss_error [gssapi_mechanism.cpp:97] gssapi: gss-code: Miscellaneous failure (see text) log_gss_error [gssapi_mechanism.cpp:113] gssapi: mech-code: unknown mech-code 22 for mech unknown What is the problem here, and how do I fix it?

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• Sftp via shell - how it is possible

  - by Tomasz Zielinski

  (Moved from StackOverflow: http://stackoverflow.com/questions/4589725/sftp-via-shell-how-it-is-possible) How is it possible for tools like http://mysecureshell.sourceforge.net/ to provide SFTP access by merely specifying them as shell by typing: usermod -s /bin/MySecureShell myuser ? I'm on Debian Lenny, with default sshd/OpenSSH. Is this e.g. a feature of SSH protocol that allows user shell to handle sftp commands? I can't wrap my head around this because usually OpenSSH needs sftp-server module (or the internal one in newer versions) - and this makes me think that sftp commands don't even hit the shell and are handled earlier or by different code path..

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• how to limit upload bandwidth per user in linux?

  - by Gihan Lasita

  Can anyone provide the tc command to limit upload bandwidth per user in Debian Lenny? I found that to mark packets per user with iptables I can use the following command iptables -t mangle -A OUTPUT -p tcp -m owner --uid-owner testuser -j MARK --set-mark 500 but I have no idea how to use tc update by running following commands, i managed to limit testuser upload bandwidth to 10Mbit iptables -t mangle -N HTB_OUT iptables -t mangle -I POSTROUTING -j HTB_OUT iptables -t mangle -A HTB_OUT -j MARK --set-mark 30 iptables -t mangle -A HTB_OUT -m owner --uid-owner testuser -j MARK --set-mark 10 tc qdisc replace dev eth0 root handle 1: htb default 30 tc class replace dev eth0 parent 1: classid 1:1 htb rate 10Mbit burst 5k tc class replace dev eth0 parent 1:1 classid 1:10 htb rate 10Mbit ceil 10Mbit tc qdisc replace dev eth0 parent 1:10 handle 10: sfq perturb 10 tc filter add dev eth0 parent 1:0 prio 0 protocol ip handle 10 fw flowid 1:10 now the problem is, i do not want to limit testuser's FTP bandwidth but by running above commands FTP speed also limited to 10Mbit. Regards

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• Ubuntu and mysql server. Something isnt allowing me to connect

  - by acidzombie24

  I have a question about mysql settings http://serverfault.com/questions/94054/remote-connections-and-mysql-on-ubuntu/94088#94088 now i want to figure out why i cannot connect. I made sure bind-address was commented out. I can ping the server within the VM but i cannot ping it from within the VM using mysqladmin --protocol=tcp --host=self_ip ping. I also followed along and check if my ports were open and they look like they are. I setup samba on that VM and can access that with no problem as well. It looks like ubuntu does not have a firewall either (i figured this out before) so i am stumped why the server isnt allowing my connection. Apparently the config file works on another person side http://www.pastie.org/742545 I am using Ubuntu 6.06 LTS just because of 'support' reasons. So hopefully this will be 'easy'?

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• Automatically updating routing table on server

  - by bramp

  I have a LAN with three routers on it, one connected to the Internet, one VPN router connected to a few remote sites, and a final route connected to a private network (using BGP to get prefix advertisements). On the same LAN I have multiple Linux servers which needs access to the networks behind each router. I have achieved this by configuring static routes on the server, pointing the different network prefixes to the correct router. This has worked well, but every time we connect to a new remote VPN, we have to change all the servers to be aware that the network is now accessible via the VPN, and not via the default Internet route. What I want is a way to automatically update the routes on all of the servers, when the route is added to a routers. Now, I could install Quagga or something similar on all the servers to receive router advertisements, but that seems like overkill. So my question is what is the easiest/simpliest way to update the routing tables on the server automatically, and what protocol is best suited for this purpose. thanks

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• PCI scan findings and problems with week ciphers on ports 993,443,995,465

  - by user64991

  From PCI scan results: Synops is : The remote service encrypts traffic using a protocol with known weaknesses . Description : The remote service accepts connections encrypted using SSL 2.0, which reportedly suffers from several cryptographic flaws and has been deprecated for several years. An attacker may be able to exploit these issues to conduct man-in-the-middle attacks or decrypt communications between the affected service and clients . See also : http://www.schneier.com/paper-ssl.pdf Solution: Consult the application's documentation to disable SSL 2.0 and use SSL 3.0 or TLS 1.0 instead. Risk Factor: Medium / CVSS Base Score : 2 (AV:R/AC:L/Au:NR/C:P/A:N/I:N/B:N) I have tried to change SSLProtocol all -SSLv2 to SSLProtocol -ALL +SSLv3 +TLSv1 And SSLCipherSuite ALL:!ADH:!EXPORT:!SSLv2:RC4+RSA:+HIGH:+MEDIUM:+LOW To SSLCipherSuite ALL:!ADH:RC4+RSA:+HIGH:!MEDIUM:!LOW:!SSLv2:!EXPORT But using SSLdigger, it shows the same result. Is this the right way to do something like this?

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• In TCP/IP terms, how does a download speed limiter in an office work?

  - by TessellatingHeckler

  Assume an office of people, they want to limit HTTP downloads to a max of 40% bandwidth of their internet connection speed so that it doesn't block other traffic. We say "it's not supported in your firewall", and they say the inevitable line "we used to be able to do it with our Netgear/DLink/DrayTek". Thinking about it, a download is like this: HTTP GET request Server sends file data as TCP packets Client acknowledges receipt of TCP packets Repeat until download finished. The speed is determined by how fast the server sends data to you, and how fast you acknowledge it. So, to limit download speed, you have two choices: 1) Instruct the server to send data to you more slowly - and I don't think there's any protocol feature to request that in TCP or HTTP. 2) Acknowledge packets more slowly by limiting your upload speed, and also ruin your upload speed. How do devices do this limiting? Is there a standard way?

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• what are python libraries to work with git without installing git

  - by Arash

  I want to develop an application using python. It should be able to work with git repositories (show diffs, ...) I need a python library to work with .git repositories (creating, cloning, commit, ...) without installing git on my system. It would be nice if you give your own idea about each library you suggest. Information about how its documentation is? how bug free it is? and if it has an active development? is appreciated. Thanks in advance

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• cannot access my own computer through My Network Places

  - by vgv8

  My home Windows XP Pro SP3 machine is DHCP client receiving configurations from ISP. Trying to access in WindowsExplorer -My Network Places - Microsoft Windows Network shows Workgroup with a delay of 3 min and then popups messagebox: Microsoft Windows Network Workgroup is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions.The list of servers for this workgroup is not currently available OK I am logged-in as local machine Administrator. The internet is accessible (I am writing this post through it) The Firewall is disabled The "Computer Bowser" and all networking services, I could find, are running Control Panel -- Network Connections -- Properties (of connection) --- Internet Protocol (TCP/IP), btn Properties --- --- tab General, btn "Advanced..." -- tab WINS-- rbtn "Enable NetBIOS over TCP/IP" checked Why cannot I access my own PC (and shares on it) through My Network Places What is the possible problem? How to daignose the problem?

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• Does an SMTP request contain host header information (or just the IP of the targeted SMTP server)?

  - by Olaf

  We are using an external commercial smtp server for our newsletters (sending them through .NET components), and they offer two smtp URLs - smtp.critsend.com and fast.critsend.com -, and the second one is reserved for sending singular emails, the first one for bulk. Using nslookup shows that both resolve to the same 4 IP addresses (fast.critsend.com being an Alias). Question: (how) is it possible for the smtp relay to distinguish between different names? Is there something in the headers that can be compared to host headers in http protocol (I didn't find any intelligible information for a non-sysadmins)? The reason I'm asking is because we would like to use one of the IPs in our newsletter script (which works) rather than a name (in order to save DNS requests), and we are wondering about potential problems.

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• Sftp via shell - how is it possible?

  - by Tomasz Zielinski

  (Moved from StackOverflow: http://stackoverflow.com/questions/4589725/sftp-via-shell-how-it-is-possible) How is it possible for tools like http://mysecureshell.sourceforge.net/ to provide SFTP access by merely specifying them as shell by typing: usermod -s /bin/MySecureShell myuser ? I'm on Debian Lenny, with default sshd/OpenSSH. Is this e.g. a feature of SSH protocol that allows user shell to handle sftp commands? I can't wrap my head around this because usually OpenSSH needs sftp-server module (or the internal one in newer versions) - and this makes me think that sftp commands don't even hit the shell and are handled earlier or by different code path..

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• MS SQL 2000 and SSL Certificate

  - by smoak

  I'm trying to set up a MS SQL 2000 server to use an already existing SSL certificate installed on the server. I verified that the certificate shows up in the Personal/Certificate folder of the account that is running the MSSQLSERVER service using the Certificate MMC snap-in. I also verified that the certificate for the CA is installed under the Trusted Root Certificate Authorities. Additionally, to make sure that it is using this specific certificate I created a Certificate registry value of type REG_BINARY in: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSQLServer\MSSQLServer\SuperSocketNetLib and I set it to the certificates thumbprint like it mentions in: http://support.microsoft.com/kb/276553 Finally, I opened up the Server Network Utility, checked Force protocol encryption, clicked OK, and restarted the MSSQLSERVER service. Unfortunately, it fails to start and looking at the event log it's failing with: 19015: Encryption requested but no valid certificate was found. SQL Server terminating. I'm at a loss. Any ideas? Where did I go wrong?

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• TFTP PUT Failing Across Hosts

  - by Jason

  I have a TFTP server installed on a CentOS host. /etc/xinetd.d/tftp: service tftp { disable = no socket_type = dgram protocol = udp wait = yes user = root server = /usr/sbin/in.tftpd server_args = -c -s /var/lib/tftpboot per_source = 11 cps = 100 2 flags = IPv4 } If I try to PUT a file from a remote host to the host running the TFTP server, I get Transfer Timed Out - however, it does create the file in /var/lib/tftpboot but the file is empty. If I tftp from the tftp server to itself (localhost) and PUT a file, it works fine. I have verified that SELinux is disabled and IPTables are turned off. I can connect from the remote hosts with no issue - just seems to be the PUT I have issue with: [root@SVR01 TEST]# tftp 10.100.2.15 tftp> status Connected to 10.100.2.15. Mode: netascii Verbose: off Tracing: off Literal: off Rexmt-interval: 5 seconds, Max-timeout: 25 seconds tftp>

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• How can i get SSO for alfresco on windows-7 to work?

  - by Maarten

  domain AD on windows 2008 R2, linux server alfresco 3.4c, windows-7 client. I'm trying to get automatically logged into alfresco from the windows-7 client. I've looked with wireshark to see what happens: 1. Client goes to /alfresco 2. Server sends Redirect to page 3. Client goes to Redirected page 4. Server sends a WWW-Authenticate: Negotiate header 5. Client DOES NOT respond to this how can i configure the windows-7 client (or the AD domain) so that the client will in fact engage with the SPNEGO protocol? instead of just asking for user credentials? (the user is logged in through kerberos in the domain.)

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• How can I share a Windows 7 library with anonymous access without using a Homegroup?

  - by Triynko

  The "homegroup" feature is useless, because it requires a password, and therefore doesn't support anonymous, no-hassle access to shares from devices such as my Sony Bravia TV and non-Windows7 machines. So I turned off homegroup and reverted to the standard shared folders protocol. I'd like to share my Music "Library", so I can play files from my TV through the Surround Sound System, but there seems to be no option to share a library folder other than through a homegroup. I don't want to have to individually share the folders that belong to the library, because that would defeat the purposes of the library, which is to manage which folders are included in the library while also providing an easily accessible view of them all at once. Does anyone know how to share a Windows 7 library without that useless homegroup feature?

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• Frequent Kernel Panic on CentOS 6.5

  - by Manuel Sopena Ballesteros

  I have a webserver with the configuration below: VMWare ESXi environemt CPanel installed CentOS release 6.5 (Final) 4 CPUs 2G RAM 2x VM disks 100G each LVM system My issue is I am getting kernel panic quite frequently. These is a list of some processes blocked I could see from the console: mysqld queueprocd httpd suphp vmtoolsd loop0 auditd this is my sar logs Linux 2.6.32-431.3.1.el6.x86_64 (test01) 08/22/2014 _x86_64_ (4 CPU) 12:00:01 AM CPU %user %nice %system %iowait %steal %idle 12:10:01 AM all 26.86 0.01 0.98 0.57 0.00 71.57 12:20:01 AM all 1.78 0.02 1.03 0.08 0.00 97.09 12:30:01 AM all 26.34 0.02 0.85 0.05 0.00 72.74 12:40:01 AM all 27.12 0.01 1.11 1.22 0.00 70.54 12:50:01 AM all 1.59 0.02 0.94 0.13 0.00 97.32 01:00:01 AM all 26.10 0.01 0.77 0.04 0.00 73.07 01:10:01 AM all 27.51 0.01 1.16 0.14 0.00 71.18 01:20:01 AM all 1.80 0.07 1.06 0.08 0.00 96.99 01:30:01 AM all 26.19 0.01 0.78 0.05 0.00 72.96 01:40:01 AM all 26.62 0.02 0.87 0.05 0.00 72.45 01:50:02 AM all 1.35 0.01 0.87 0.02 0.00 97.75 02:00:01 AM all 26.11 0.02 0.69 0.02 0.00 73.17 02:10:01 AM all 26.73 0.02 0.89 0.14 0.00 72.21 02:20:01 AM all 1.45 0.01 0.92 0.04 0.00 97.58 02:30:01 AM all 26.59 0.01 1.06 0.03 0.00 72.31 02:40:01 AM all 26.27 0.01 0.72 0.05 0.00 72.95 02:50:01 AM all 0.86 0.01 0.50 0.09 0.00 98.53 03:00:01 AM all 25.61 0.02 0.39 0.03 0.00 73.96 03:10:01 AM all 26.30 0.08 0.66 0.14 0.00 72.82 03:20:01 AM all 0.81 0.01 0.51 0.04 0.00 98.63 03:30:02 AM all 26.15 0.02 0.53 0.07 0.00 73.24 03:40:01 AM all 26.06 0.01 0.47 0.04 0.00 73.42 03:50:01 AM all 0.96 0.02 0.51 0.03 0.00 98.48 Average: all 17.69 0.02 0.79 0.14 0.00 81.36 06:58:14 AM LINUX RESTART 07:00:01 AM CPU %user %nice %system %iowait %steal %idle 07:10:01 AM all 1.04 0.02 0.57 0.95 0.00 97.42 07:20:02 AM all 0.66 0.01 0.39 0.06 0.00 98.87 07:30:01 AM all 25.71 0.01 0.45 0.16 0.00 73.67 07:40:01 AM all 25.88 0.01 0.35 0.08 0.00 73.68 As you can see the server became unresponsive at 03.50 AM and I had to reset the VM at 06.58 AM to fix it. sar -d 03:00:01 PM dev8-16 0.16 0.01 3.37 20.78 0.00 12.40 9.29 0.15 03:00:01 PM dev8-0 4.08 5.72 77.50 20.38 0.06 15.15 3.13 1.28 03:00:01 PM dev253-0 10.37 5.74 80.87 8.35 0.13 12.52 1.24 1.29 03:00:01 PM dev253-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 03:10:01 PM dev8-16 0.27 0.17 3.17 12.22 0.00 11.49 7.95 0.22 03:10:01 PM dev8-0 6.37 18.98 136.19 24.34 0.05 7.25 2.18 1.39 03:10:01 PM dev253-0 17.91 19.15 137.94 8.77 0.13 7.11 0.78 1.41 03:10:01 PM dev253-1 0.18 0.00 1.41 8.00 0.00 9.09 0.52 0.01 03:10:01 PM DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util 03:20:01 PM dev8-16 0.17 0.23 2.04 13.39 0.00 6.07 5.29 0.09 03:20:01 PM dev8-0 3.83 18.57 78.45 25.35 0.05 13.25 2.73 1.05 03:20:01 PM dev253-0 10.30 18.80 80.49 9.64 0.14 13.89 1.03 1.06 03:20:01 PM dev253-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 03:30:01 PM dev8-16 0.26 0.16 4.59 18.56 0.00 6.44 5.54 0.14 03:30:01 PM dev8-0 5.97 24.07 117.83 23.77 0.05 8.53 2.13 1.27 03:30:01 PM dev253-0 15.90 24.23 122.42 9.22 0.12 7.71 0.81 1.29 03:30:01 PM dev253-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 03:40:01 PM dev8-16 0.20 0.00 2.32 11.44 0.00 8.35 5.90 0.12 03:40:01 PM dev8-0 4.39 19.58 77.94 22.24 0.06 12.87 2.12 0.93 03:40:01 PM dev253-0 10.25 19.58 80.25 9.74 0.12 11.63 0.91 0.94 03:40:01 PM dev253-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 03:50:01 PM dev8-16 0.23 0.50 2.32 12.44 0.00 6.27 5.13 0.12 03:50:01 PM dev8-0 5.09 9.00 95.04 20.45 0.04 7.36 2.10 1.07 03:50:01 PM dev253-0 12.47 9.50 96.82 8.53 0.08 6.76 0.87 1.08 03:50:01 PM dev253-1 0.07 0.00 0.54 8.00 0.00 14.10 0.40 0.00 04:00:01 PM dev8-16 0.21 0.00 2.04 9.89 0.00 7.00 5.87 0.12 04:00:01 PM dev8-0 4.68 1.64 94.70 20.57 0.05 10.71 2.41 1.13 04:00:01 PM dev253-0 12.27 1.64 96.74 8.02 0.12 9.95 0.93 1.14 sar -q 01:00:01 AM 6 205 2.02 1.32 0.81 01:10:01 AM 3 187 0.08 0.72 0.86 01:20:01 AM 2 187 0.04 0.18 0.49 01:30:01 AM 4 205 2.04 1.34 0.82 01:40:01 AM 2 185 0.02 0.68 0.83 01:50:02 AM 1 185 0.08 0.15 0.45 02:00:01 AM 5 202 2.02 1.30 0.78 02:10:01 AM 4 185 0.11 0.72 0.84 02:20:01 AM 1 183 0.17 0.15 0.45 02:30:01 AM 5 206 2.03 1.32 0.79 02:40:01 AM 2 184 0.08 0.70 0.83 02:50:01 AM 1 183 0.00 0.10 0.43 03:00:01 AM 7 205 2.03 1.32 0.78 03:10:01 AM 2 194 0.34 0.73 0.83 03:20:01 AM 1 184 0.00 0.13 0.44 03:30:02 AM 4 201 2.04 1.32 0.78 03:40:01 AM 2 193 0.06 0.67 0.81 03:50:01 AM 1 183 0.06 0.12 0.43 Average: 3 192 0.68 0.70 0.69 06:58:14 AM LINUX RESTART 07:00:01 AM runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15 07:10:01 AM 2 181 0.00 0.09 0.11 07:20:02 AM 1 179 0.00 0.00 0.04 07:30:01 AM 4 197 2.12 1.33 0.58 sar -r Linux 2.6.32-431.3.1.el6.x86_64 (test01) 08/22/2014 _x86_64_ (4 CPU) 12:00:01 AM kbmemfree kbmemused %memused kbbuffers kbcached kbcommit %commit 12:10:01 AM 227484 1694468 88.16 117444 917004 635308 10.50 12:20:01 AM 219692 1702260 88.57 119556 920540 630940 10.43 12:30:01 AM 196248 1725704 89.79 121376 923592 695048 11.49 12:40:01 AM 127524 1794428 93.36 125004 1016196 633048 10.46 12:50:01 AM 127156 1794796 93.38 128212 1014536 624992 10.33 01:00:01 AM 110764 1811188 94.24 129964 1001608 700016 11.57 01:10:01 AM 160560 1761392 91.65 132260 973472 628640 10.39 01:20:01 AM 133076 1788876 93.08 134144 982608 655524 10.83 01:30:01 AM 121512 1800440 93.68 135548 985676 700500 11.58 01:40:01 AM 140640 1781312 92.68 137220 988576 628280 10.38 01:50:02 AM 139160 1782792 92.76 138688 990672 625224 10.33 02:00:01 AM 106112 1815840 94.48 139940 993976 700360 11.57 02:10:01 AM 155400 1766552 91.91 142112 971864 625656 10.34 02:20:01 AM 154056 1767896 91.98 143732 975556 621352 10.27 02:30:01 AM 110856 1811096 94.23 145032 978288 709360 11.72 02:40:01 AM 140200 1781752 92.71 146568 980656 624872 10.33 02:50:01 AM 137600 1784352 92.84 148940 984484 621948 10.28 03:00:01 AM 105032 1816920 94.54 150208 985736 706060 11.67 03:10:01 AM 168996 1752956 91.21 154708 941500 656312 10.85 03:20:01 AM 169408 1752544 91.19 156096 944100 621780 10.28 03:30:02 AM 132360 1789592 93.11 157724 951612 701296 11.59 03:40:01 AM 159012 1762940 91.73 158940 942560 656292 10.85 03:50:01 AM 163192 1758760 91.51 160312 944576 624544 10.32 Average: 148089 1773863 92.29 140162 969973 653363 10.80 06:58:14 AM LINUX RESTART 07:00:01 AM kbmemfree kbmemused %memused kbbuffers kbcached kbcommit %commit 07:10:01 AM 1016628 905324 47.10 85568 447556 600932 9.93 07:20:02 AM 1009996 911956 47.45 87616 451200 596156 9.85 07:30:01 AM 961128 960824 49.99 89164 464332 658912 10.89 07:40:01 AM 973376 948576 49.35 90880 473084 600176 9.92 dmesg does not show any relevant information. I don't see any bottleneck in sar, any idea what can I check next? thank you very much

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• external pop email relay

  - by Pixman

  I want to offer to my customer this possibility : get her pop3 emails from external pop3 server forward the news emails to the new external pop3 server I have find lot of tools for sync imap accounts, or sync pop to imap, but i just want get pop and send to another email adress ! I search a answer for linux ( if i can make a simple daemon for make it's it's good ). Thanks a lot for your help. edit for more detail : For simplify my question, in my use case, it's just want to connect as client via pop protocol ( like a mail app ). And i check news emails, and forward to other email adress. I search about an app or code for create this on linux. In this situation have no access to mailbox dirs, or server configuration ( in this case i have already the answer by create a qmail hook ) Maybe, it's not the good website ? my question must be post on the stackoverflow part ?

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• How do you apply development practices like version control, testing and continuous integration/deployment to system administration?

  - by arex1337

  Imagine you're going to manage a number of servers with a number of different services that's used by a number of people. Now say you want to reconfigure or replace some software on one of those servers. Obviously you don't want to work on servers that are in production. If this was a code change, as a developer, I would make the change on my local development machine, test it locally and commit the change to a version control system. The changes could then be deployed in a staging environment, tested further and finally deployed in a production environment. It would also be easy for me to roll back, if necessary. Generally, or specifically, how do you achieve this in system administration? (The first thing that comes to mind is to use virtual machines and put virtual machine images in version control, but I'm sure there is a lot of literature and clever solutions I'm not presently aware of.)

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• How to correctly set up iWARP? Preferably on loopback

  - by ajdecon

  iWARP is a protocol for doing remote direct memory access (RDMA) on top of TCP/IP, so that it can work with Ethernet and other network types as opposed to Infiniband. It works with many of the standard IB interfaces - the IB verbs, for example - so it's all pretty transparent. I'm doing some IB-verbs programming (mostly for the sake of learning about how they work better), and it'd be wonderfully convenient for me if I could use iWARP to do RDMA over my loopback interface, so that I could test some of my code without getting on our IB-connected cluster. :-) But I cannot figure out how to get a "local development environment" set up: there are no tutorials I'm aware of for even setting up iWARP from scratch on a server or a network interface. Can anyone give me a tutorial or point me in the right direction? Environment is Fedora 16 running in VirtualBox.

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• Network monitoring solution

  - by Hellfrost

  Hello Serverfault ! I have a big distributed system I need to monitor. Background: My system is comprised of two servers, concentrating and controlling the system. Each server is connected to a set of devices (some custom kind of RF controllers, doesnt matter to my question), each device connects to a network switch, and eventually all devices talk to the servers, the protocol between the servers and the devices is UDP, usually the packets are very small, but there are really a LOT of packets. the network is also somewhat complex, and is deployed on a large area physically. i'll have 150-300 of these devices, each generating up to 100+ packets per second, and several network switches, perhaps on 2 different subnets. Question I'm looking for some solution that will allow me to monitor all this mess, how many packets are sent, where, how do they move through the network, bandwidth utilization, throughput, stuff like that. what would you recommend to achieve this? BTW Playing nice with windows is a requirement.

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• Machine account authentication on Radius server

  - by O.Shevchenko

  My workstation is under Linux. I have an Active Directory domain controller + Radius server on Windows 2008. I can verify user account 'radius-01' using 'radtest' tool: $ radtest -t pap radius-01 password123 195.234.133.32 1812 password123 Sending Access-Request of id 98 to 195.234.73.2 port 1812 User-Name = "radius-01" User-Password = "password123" NAS-IP-Address = 127.0.1.1 NAS-Port = 1812 rad_recv: Access-Accept packet from host 195.234.133.32 port 1812, id=98, length=84 Framed-MTU = 1344 Framed-Protocol = PPP Service-Type = Framed-User Class = 0x537004f00000013700010200ac1c0... I have joined my Linux PC to Active Directory domain ARB-HRK using Samba: [root@shev-arb]# net ads testjoin Join is OK I can dump machine password: [root@shev-arb]# tdbdump /var/lib/samba/private/secrets.tdb { key(34) = "SECRETS/MACHINE_PASSWORD/ARB-HRK" data(15) = "yGgXJsquRnpT0g\00" } How can i authenticate my machine account on Radius server? Do anybody know any tools for this, like: radtest shev-arb$ yGgXJsquRnpT0g 195.234.133.32 1812 password123 (this command fails)

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