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• Cisco 837 not passing UDP traffic properly (was: DNS query problem)

  - by TessellatingHeckler

  We have a setup of ADSL line - Cisco 837 ADSL router - Zyxel ZyWall 35 firewall/NAT - Switch - LAN. It has been fine for years, suddenly DNS resolution stopped working from the LAN to public DNS servers. No changes that I know of, so I can't revert anything. Current behaviour: DNS requests from the LAN using TCP show up in the oubound firewall log, in the Cisco debug log, in the dns-server-firewall, in tcpdump on the DNS server, the answer comes back, it works fine. DNS requests from the LAN using UDP show up in the outbound firewall log, in the Cisco debug log, but does NOT show in the dns-server-firewall, not in tcpdump on the DNS server, times out. DNS requests from the Cisco using UDP show up in the dns-server-firewall and in tcpdump on the DNS server, answer received, works fine. netcat connections to port 53 or a random port by TCP show up in the dns-server-firewall netcat connections to port 53 or a random port by UDP do not show up in the dns-server-firewall Summary: TCP seems fine throughought. UDP works from the Cisco over the ADSL, and it works from the LAN to the Cisco, but it doesn't seem to cross the Cisco 837 properly. Update: confirmed with netcat that any UDP traffic from the LAN is affected, not just traffic to port 53. Update: If I change the firewall's external IP to any other IP in the subnet, this starts working. When I put it back, it stops working. I now suspect it's an ISP issue (does that sound plausible?), and am removing the Cisco config.

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• memcached append() php ubuntu - bad protocol

  - by awongh

  I am running ubuntu gutsy(7.1) , php5 and I am trying to get memcached running locally. I installed everything as per the docs: memcached daemon, php PECL extension, libevent, etc. But now I can only run half of the example script for memcached append(): <?php $m = new Memcached(); $m->addServer('localhost', 11211); $m->setOption(Memcached::OPT_COMPRESSION, false); $m->set('foo', 'abc'); $m->append('foo', 'def'); var_dump($m->get('foo')); ?> the script terminates @ append() with an RES_BAD_PROTOCOL error message. It still runs the get(). I don't know why memcached would otherwise be working fine (connect, set, get - with the correct value of 'abc') and not work for append. it also doesnt work with prepend. I believe I have the setup correct, but I am not sure. Maybe there are compatibility problems between the versions of the dependecies? thanks much

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• Openfiler iSCSI performance

  - by Justin

  Hoping someone can point me in the right direction with some iSCSI performance issues I'm having. I'm running Openfiler 2.99 on an older ProLiant DL360 G5. Dual Xeon processor, 6GB ECC RAM, Intel Gigabit Server NIC, SAS controller with and 3 10K SAS drives in a RAID 5. When I run a simple write test from the box directly the performance is very good: [root@localhost ~]# dd if=/dev/zero of=tmpfile bs=1M count=1000 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 4.64468 s, 226 MB/s So I created a LUN, attached it to another box I have running ESXi 5.1 (Core i7 2600k, 16GB RAM, Intel Gigabit Server NIC) and created a new datastore. Once I created the datastore I was able to create and start a VM running CentOS with 2GB of RAM and 16GB of disk space. The OS installed fine and I'm able to use it but when I ran the same test inside the VM I get dramatically different results: [root@localhost ~]# dd if=/dev/zero of=tmpfile bs=1M count=1000 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 26.8786 s, 39.0 MB/s [root@localhost ~]# Both servers have brand new Intel Server NIC's and I have Jumbo Frames enabled on the switch, the openfiler box as well as the VMKernel adapter on the ESXi box. I can confirm this is set up properly by using the vmkping command from the ESXi host: ~ # vmkping 10.0.0.1 -s 9000 PING 10.0.0.1 (10.0.0.1): 9000 data bytes 9008 bytes from 10.0.0.1: icmp_seq=0 ttl=64 time=0.533 ms 9008 bytes from 10.0.0.1: icmp_seq=1 ttl=64 time=0.736 ms 9008 bytes from 10.0.0.1: icmp_seq=2 ttl=64 time=0.570 ms The only thing I haven't tried as far as networking goes is bonding two interfaces together. I'm open to trying that down the road but for now I am trying to keep things simple. I know this is a pretty modest setup and I'm not expecting top notch performance but I would like to see 90-100MB/s. Any ideas?

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• Bash script 'while read' loop causes 'broken pipe' error when run with GNU Parallel

  - by Joe White

  According to the GNU Parallel mailing list this is not a GNU Parallel-specific problem. They suggested that I post my problem here. The error I'm getting is a "broken pipe" error, but I feel I should first explain the context of my problem and what causes this error. It happens when trying to use any bash script containing a 'while read' loop in GNU Parallel. I have a basic bash script like this: #!/bin/bash # linkcheck.sh while read domain do host "$domain" done Assume that I want to pipe in a large list (250mb say). cat urllist | ./linkcheck.sh Running host command on 250mb worth of URLs is rather slow. To speed things up I want to break up the input into chunks before piping it and then run multiple jobs in parallel. GNU Parallel is capable of doing this. cat urllist | parallel --pipe -j0 parallel ./linkcheck.sh {} {} is substituted by the contents of urllist line-by-line. Assume that my systems default setup is capable of running 500ish jobs per instance of parallel. To get round this limitation we can parallelize Parallel itself: cat urllist | parallel -j10 --pipe parallel -j0 ./linkcheck.sh {} This will run 5000'ish jobs. It will also, sadly, cause the error "broken pipe" (bash FAQ). Yet the script starts to work if I remove the while read loop and take input directly from whatever is fed into {} e.g., #!/bin/bash # linkchecker.sh domain="$1" host "$1" Why will it not work with a while read loop? Is it safe to just turn off the SIGPIPE signal to stop the "broken pipe" message, or will that have side effects such as data corruption? Thanks for reading.

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• Internal but no external Citrix Access?

  - by leeand00

  We recently had to reload our configuration of Citrix on our server Server1, and since we have, we can access Citrix internally, but not externally. Normally we access Citrix from http://remote.xyz.org/Citrix/XenApp but since the configuration was reloaded we are met with a Service Unavailable message. Internally accessing the Citrix web application from http://localhost/Citrix/XenApp/ on Server1 we are able to access the web application. And also from machines on our local network using http://Server1/Citrix/XenApp/. I have gone into the Citrix Access Management Console and from the tree pane on the left clicked on Citrix Access Management Console->Citrix Resources->Configuration Tools->Web Interface->http://remote.xyz.org/Citrix/PNAgent Citrix Access Management Console->Citrix Resources->Configuration Tools->Web Interface->http://remote.xyz.org/Citrix/XenApp, which in both cases displays a screen that reads Secure client access. Here it offers me several options: Direct, Alternate, Translated, Gateway Direct, Gateway Alternate, Gateway Translated. I know that I can change the method of use by clicking Manage secure client access->Edit secure client access settings which opens a window that reads "Specify Access Methods", and below that reads "Specify details of the DMZ settings, including IP address, mask, and associated access method", I don't know what the original settings were, and I also don't know how our DMZ is configured so that I can specify the correct settings, to give access to our external users on the http://remote.xyz.org/Citrix/XenApp site. We have a vendor who setup our DMZ and does not allow us access to the gateway to see these settings. What sorts of questions should I ask them to restore remote access?

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• Where should CentOS users get /usr/share/virtio-win/drivers for virt-v2v?

  - by Philip Durbin

  I need to migrate a number of virtual machines from VMware ESX to CentOS 6 KVM hypervisors. Ultimately, I wrote an RPM spec file that solved my problem at https://github.com/fasrc/virtio-win/blob/master/virtio-win.spec but I'm not sure if there's another RPM in base CentOS or EPEL (something standard) I should be using instead. Originally, I was getting this "No root device found in this operating system image" error when attemting to migrate a Window 2008 VM. . . [root@kvm01b ~]# virt-v2v -ic 'esx://my-vmware-hypervisor.example.com/' \ -os transferimages --network default my-vm virt-v2v: No root device found in this operating system image. . . . but I solved this with a simply yum install libguestfs-winsupport since the docs say: If you attempt to convert a virtual machine using NTFS without the libguestfs-winsupport package installed, the conversion will fail. Next I got an error about missing drivers for Windows 2008. . . [root@kvm01b ~]# virt-v2v -ic 'esx://my-vmware-hypervisor.example.com/' \ -os transferimages --network default my-vm my-vm_my-vm: 100% [====================================]D virt-v2v: Installation failed because the following files referenced in the configuration file are required, but missing: /usr/share/virtio-win/drivers/amd64/Win2008 . . . and I resolved this by grabbing an iso from Fedora at http://alt.fedoraproject.org/pub/alt/virtio-win/latest/ as recommended by http://www.linux-kvm.org/page/WindowsGuestDrivers/Download_Drivers and building an RPM from it with this spec file: https://github.com/fasrc/virtio-win/blob/master/virtio-win.spec Now, virt-v2v exits without error: [root@kvm01b ~]# virt-v2v -ic 'esx://my-vmware-hypervisor.example.com/' \ -os transferimages --network default my-vm my-vm_my-vm: 100% [====================================]D virt-v2v: my-vm configured with virtio drivers. [root@kvm01b ~]# Now, my question is, rather that the virtio-win RPM from the spec file I wrote, is there some other more standard RPM in base CentOS or EPEL that will resolve the error above? Here's a bit more detail about my setup: [root@kvm01b ~]# cat /etc/redhat-release CentOS release 6.2 (Final) [root@kvm01b ~]# rpm -q virt-v2v virt-v2v-0.8.3-5.el6.x86_64 See also Bug 605334 – VirtIO driver for windows does not show specific OS: Windows 7, Windows 2003

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• 2 Server FC SAN Configuration

  - by BSte

  I have 2 identical servers: -48GB Ram -8GigE NIC's -2FC NIC's -2x72GB RAID1 Hard Drives -Server 2008R2 Host I also Have a Fibre Channel SAN: -16x146GB RAID10 Hard Drives -2xDual-port FC Controllers (Controller A and B both have ports 1 and 2) -Server 1 has Fiber to Ports A1 and B1 -Server 2 has Fiber to Ports A2 and B2 -I kept the default config with 1 Virtual Disk and 1 Volume -The default mappings show ports A1,A2,B1,B2 on LUN 0 with read-write My goal is: -2xVM's with IIS and Guest Level Failover -2xVM's with SQL 2008 Enterprise using a Single DB and Guest Level Failover -1xVM that is an application server, preferable with Host Failover. From what I read, this will also need AD for clustering to work. -I need at least 1 VM always running for IIS and the SQLDB. This includes hardware failover and application (ie: reboot a VM for Critical updates) I was told I could install the VM's and run them from the SAN, and this is what I've tried: Installed MPIO and HyperV on Server1 and Server 2 Added the SAN as Disk E: on both servers, made it GPT and formatted NTFS Configured HyperV on both server to store use E:\VD and E:\VHD On server1, I was able to install 3 VM's on the SAN and all worked well. On server2, I would start installing the other 2 VM's, but always at some point the VM's would get a corrupt .VHD message (either server). Everything I found about the message typically related to antivirus, so I removed all antivirus on both Host servers (now only running 2008R2). I reformatted drive E: (SAN), recreated the VHD and VD directories, installed 3 VM's on Server 1, and then had the same issue when installing VM's on Server2. Obviously something is wrong, but I'm not certain what exactly. My questions: 1) Are my goals possible with this hardware setup? -I've read 2008R2 supports FC SAN's, but a lot of articles seem to only give examples with iSCSCI setups 2) What would be the suggested route on setting up the SAN (disks,volumes,LUN's)? I've worked with HyperV on a single machine before and never had issues. Actual experience working on SAN's and clustering is new to me. Any suggestions or recommendations to get me in the right direction would be much appreciated.

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• VSFTP Users and Directories

  - by Mathew

  I'm stuck. I've been working all day on trying to figure out what I'm doing wrong and I've hit wall after wall. What I'm trying to do: Setup FTP in such a way that certain users have access only to their directory, but higher level users have access to all directories. What I've Googled so far: I started with this, but that didn't do what I needed it to. I then used this, but once I created one user, it wouldn't let me create another one. Finally, I decided to follow this, but it wouldn't let me even create one user. I'm using Ubuntu 10. I can login to ftp as a root user and it takes me to the home directory. If I try to login using the user I created in the tutorial it says: Status: Connection established, waiting for welcome message... Response: 220 (vsFTPd 2.2.2) Command: USER mathew Response: 331 Please specify the password. Command: PASS **** Response: 530 Login incorrect. Error: Critical error Error: Could not connect to server

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• fail2ban Error Gentoo

  - by Mark Davidson

  Hi All I've recently setup a new VPS running Gentoo (My first time using the distro so please forgive me is this is a really easy one) and as I've done with other servers installed fail2ban. Setting it up to block the host via iptables, on too many unsuccessful logins with ssh. However I'm getting a strange error that I can't quite solve. When I start fail2ban I get these lines in the error log 2009-11-13 18:02:01,290 fail2ban.jail : INFO Jail 'ssh-iptables' started 2009-11-13 18:02:01,480 fail2ban.actions.action: ERROR iptables -N fail2ban-SSH iptables -A fail2ban-SSH -j RETURN iptables -I INPUT -p tcp --dport ssh -j fail2ban-SSH returned 100 If I try and force a ban these errors show up in the log and the host is not banned 2009-11-13 11:23:26,905 fail2ban.actions: WARNING [ssh-iptables] Ban XXX.XXX.XXX.XXX 2009-11-13 11:23:26,929 fail2ban.actions.action: ERROR iptables -n -L INPUT | grep -q fail2ban-SSH returned 100 2009-11-13 11:23:26,930 fail2ban.actions.action: ERROR Invariant check failed. Trying to restore a sane environment 2009-11-13 11:23:27,007 fail2ban.actions.action: ERROR iptables -N fail2ban-SSH iptables -A fail2ban-SSH -j RETURN iptables -I INPUT -p tcp --dport ssh -j fail2ban-SSH returned 100 2009-11-13 11:23:27,016 fail2ban.actions.action: ERROR iptables -n -L INPUT | grep -q fail2ban-SSH returned 100 2009-11-13 11:23:27,016 fail2ban.actions.action: CRITICAL Unable to restore environment My versions are as follows Linux masked 2.6.18-xen-r12 #2 SMP Wed Mar 4 11:45:03 GMT 2009 x86_64 Intel(R) Xeon(R) CPU E5504 @ 2.00GHz GenuineIntel GNU/Linux net-analyzer/fail2ban-0.8.4 net-firewall/iptables-1.4.3.2 If anyone could shead some light on these errors that would be great, I did wonder if it was a problem with iptables or some kernel modules but I can block an IP if I do. iptables -I INPUT -s 25.55.55.55 -j DROP so makes me think its something a bit more unusual. Thanks a lot in advance

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• Can a wifi AP act as a client, and a server at the same time?

  - by nbolton

  I feel this is SF worthy (as opposed to SU) as I go into a bit of detail on gateways/routing. Here's my ideal setup (if possible) -- there is a wifi network (lets call it bob's) with which I want access to, but I have a few other computers on my network which I want to keep behind a firewall. So I was thinking of buying a wireless access point so that I could set it up to connect to bob's network from the AP, and then from my server, connect to the AP via ethernet. So that's the first bit. Second part is that I want to have my own private wifi network off the back of this; can I then tell the AP to serve a new network called foobar. When I say private network, I mean that my server is actually a Debian linux install with routing configured (and I also do some QoS stuff on, etc). So ideally, I'd like all the clients on the private network to be behind the server in terms of routing. However, if the private clients connect to the server via wifi, then aren't they exposed to the "public" network? That is, if someone is savvy enough to scan for my IP range. Also, to do routing I'd need to connect two ethernet cables between the server and the AP (because you can't do routing/QoS on virtual devices) -- which isn't a problem really; but I'm not sure whether the AP will allow me to separate the public and private LANs. Or, as well as the AP, am I better getting a wifi-to-ethernet adapter for the server? I could use a wifi usb, but this can be tricky to set up on headless linux; plus the signal strength is a bit lousy. If this question is a bit vague/spurious in places, please comment and I will explain in more detail.

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• Windows Server (SBS) 2008 - Telephony service won't start (missing permissions)

  - by Uri

  I am running a SBS 2008 server. It's setup as the domain controller for the network. After a reboot, the Telephony service (and all services that depend on it) refuses to start under the Network Service account. The error given is: Error 1297: A privilege that the service requires to function properly does not exist in the service account configuration. You may use the Services Microsoft Management Console (MMC) snap-in (services.msc) and the Local Security Settings MMC snap-in (secpol.msc) to view the service configuration and the account configuration. This has caused all the network services not to be accessible e.g. terminal services, VPN (RRAS), SQL Server instances. The SSH daemon I have running on the box will accept connections only from localhost, but won't respond on the network. After searching around, the only advice I could find was to grant the Network Service account these permissions: Adjust memory quotas for a process Replace a process level token I set those permissions on both the Default Domain Policy and the Default Domain Controller Policy, but it seemingly had no effect. Most of the services will start if I change them to run under the Local System account, but that didn't make them accessible on the network. I even tried removing the Routing and Remote Access Services feature, rebooting and reinstalling it, but the issue remains. Any ideas?

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• HTTP Error 503. The service is unavailable

  - by user1671639

  I'm struggling to setup the environment in IIS8, I searched a lot but couldn't find a right solution. I checked the error logs, but no idea. C:\Windows\System32\LogFiles\HTTPERR 2013-10-09 09:28:39 192.168.43.205 60172 192.168.43.205 80 HTTP/1.1 GET / 503 2 AppOffline qa.hti.local 2013-10-09 09:28:39 192.168.43.205 60192 192.168.43.205 80 HTTP/1.1 GET /favicon.ico 503 2 AppOffline qa.hti.local Then in Event Viewer: WARNINGS: A listener channel for protocol 'http' in worker process '11188' serving application pool 'qa.hti.local' reported a listener channel failure. The data field contains the error number. A listener channel for protocol 'http' in worker process '7492' serving application pool 'qa.hti.local' reported a listener channel failure. The data field contains the error number. A listener channel for protocol 'http' in worker process '9088' serving application pool 'qa.hti.local' reported a listener channel failure. The data field contains the error number. A listener channel for protocol 'http' in worker process '9964' serving application pool 'qa.hti.local' reported a listener channel failure. The data field contains the error number. A listener channel for protocol 'http' in worker process '7716' serving application pool 'qa.hti.local' reported a listener channel failure. The data field contains the error number. I don't understand what the warning means. ERROR: Application pool 'qa.hti.local' is being automatically disabled due to a series of failures in the process(es) serving that application pool. Note: I learned that consecutive 5 failures leads to APP Pool crash, and this can increased. I also tried increasing this but no success. OS: Windows server 2012 IIS Version: 8 Please share your thoughts.

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• Nagios Apache Config with PHP-FPM downloading cgi files

  - by tubaguy50035

  I'm trying to setup Nagios 3 under Apache 2.4 with PHP-FPM. I've run into a couple problems I could use help with. The PHP side of things seems to be working, I can see the home page and the sidebar. But all of the CGI files are downloading instead of executing, and when I try to click on "Read What's New In Nagios Core 3", I get an error /nagios3/docs/whatsnew.html was not found on this server. Below is my vhost config for Nagios. <VirtualHost *:300> # apache configuration for nagios 3.x ScriptAlias /cgi-bin/nagios3 /usr/lib/cgi-bin/nagios3 ScriptAlias /nagios3/cgi-bin /usr/lib/cgi-bin/nagios3 # Where the stylesheets (config files) reside Alias /nagios3/stylesheets /etc/nagios3/stylesheets # Where the HTML pages live Alias /nagios3 /usr/share/nagios3/htdocs ProxyPassMatch ^/(.*\.php)$ fcgi://127.0.0.1:9001/usr/share/nagios3/htdocs/$1 <DirectoryMatch (/usr/share/nagios3/htdocs|/usr/lib/cgi-bin/nagios3|/etc/nagios3/stylesheets)> Options FollowSymLinks ExecCGI AllowOverride AuthConfig Order Allow,Deny Allow From All AuthName "Nagios Access" AuthType Basic AuthUserFile /etc/nagios3/htpasswd.users require valid-user </DirectoryMatch> <Directory /usr/share/nagios3/htdocs> Options +ExecCGI </Directory> </VirtualHost> I also added this in my global Apache config: AddHandler cgi-script .cgi Any help or instructions you can give me would be much appreciated. If more information is needed, let me know.

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• authbind, privbind or iptables REDIRECT (port 80 to 8080)?

  - by chris_l

  Hi, I'd like to run Glassfish v3 as a non-privileged user on Linux (Debian), but make it available on port 80. I'm currently doing this with iptables: iptables -t nat -I PREROUTING -p tcp -d x.x.x.x --dport 80 -j REDIRECT --to-port 8080 This works, but I wonder: If this has any significant performance impact compared to binding directly to port 80 If I could make a similar setup also work for HTTPS (or if that must run on 443) If there's a way to avoid other users from binding to port 8080 (in case my server crashes) - maybe block that port permanently to other users somehow? ...or if I should use authbind/privbind instead? Problem: I couldn't make it work with authbind or privbind so far. For authbind, I edited asadmin's last line to: exec authbind --deep "$JAVA" -Djava.net.preferIPv4Stack=true -jar ... For privbind: exec privbind -u glassfish "$JAVA" -Djava.net.preferIPv4Stack=true -jar ... (Only) with these settings, I can successfully perform a create-domain --domainport 80. This proves, that authbind and privbind actually work (the authbind version of the script is called by the glassfish user; the privbind version is called by root of course). However, in both cases I get the following exception, when starting the domain (start-domain): [#|2010-03-20T13:25:21.925+0100|SEVERE|glassfishv3.0|javax.enterprise.system.core.com.sun.enterprise.v3.server|_ThreadID=11;_ThreadName=FelixStartLevel;|Shutting down v3 due to startup exception : Permission denied: 80=com.sun.enterprise.v3.services.impl.monitor.MonitorableSelectorHandler@1fc25e5|#] I haven't found a solution for that yet (after searching the web, it seems, that this isn't so easy?) But maybe, the solution with iptables is good enough - what do you think? Thanks, Chris

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• Virutal Machine loses network connectivity on Hyper V Cluster

  - by Chris W

  We're running a number of VMs on a 6 node failover cluster of blades using Hyper V. We have an intermittent issue (every few days at different times - not a fixed frequency) of VMs losing network connectivity. Console access to the VM suggests all is fine and the underlying blade has normal connectivity. To resolve the problem we either have to re-start the VM or, more usually, we do a live migration to another blade which fires up connectivity and we then migrate it back to the original blade. I've had 3 instances of this happen with a specific VM running on a particular blade however it has happened once with a different VM running on a different blade. All VMs and blades have the same basic setup and are running Windows 2008 R2. Any ideas where I should be looking to diagnose the possible causes of this problem as the event logs provide no help? Edit: I've checked that each blade is running the latest NIC drivers and all seem to be fine. Something that is confusing me - a failover or restart of the VM resolves the issue. Whilst I need to work out the underlying issue that is causing the NICs to hang I'm also concerned that the VM didn't failover to another node which would have solved the outage for me. Is there a way to configure the cluster so that it can tell that the VM guest has lost connectivity and fail it over? As things stand the cluster is assuming that the VM is running happily as I presume Hyper V says everything is great even though there is a problem.

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• Mounting Replicated Gluster Multi-AZ Storage

  - by Roman Newaza

  I have Replicated Gluster Storage which is used by Auto scaling Servers. Both, Auto scaling and Storage are allocated in two Availability zones. Gluster: Number of Bricks: 4 x 2 = 8 Transport-type: tcp Bricks: Brick1: gluster01:/storage/1a # Zone A Brick2: gluster02:/storage/1b # Zone B Brick3: gluster03:/storage/2a # Zone A Brick4: gluster04:/storage/2b # Zone B Brick5: gluster01:/storage/3a # Zone A Brick6: gluster02:/storage/3b # Zone B Brick7: gluster03:/storage/4a # Zone A Brick8: gluster04:/storage/4b # Zone B I used Round Robin DNS for Gluster entry point, so DNS name resolves to all of the storage server addresses which are returned in different order all the time: # host storage.domain.com storage.domain.com has address xx.xx.xx.x1 storage.domain.com has address xx.xx.xx.x2 storage.domain.com has address xx.xx.xx.x3 storage.domain.com has address xx.xx.xx.x4 The Storage is mounted with Native Gluster Client: # grep storage /etc/fstab storage.domain.com:/storage /storage glusterfs defaults,log-level=WARNING,log-file=/var/log/gluster.log 0 0 I have heard Gluster might be mounted with the first Server IP and after that it will fetch its configuration with the rest of Servers. Personally, I never tested single Server mount setup and I don't know how Gluster handles this. On EC2, traffic among single Availability zone is free and between different zones is not. When Client in zone A writes to storage and IP of Storage in zone B is returned, it will cost me twice more for data transfer: Client (Zone A) - Storage Server (Zone B) - Replication to Storage Server (Zone A). Question: Would it be better to mount Storage Server of the same zone, so that data transfer charges apply only for replication (A - A - B)?

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• Force netsh/arp binding multicast IP addres with specific MAC address

  - by Olivier

  I would like to setup an binding from an IP address to a MAC address using netsh. Goal is to bond an IP address which is a multicast address (224.224.x.y) to a given MAC address (which is NOT the calculated one from the multicast IP address : 01:00:5e:X:Y:Z It used to work with Windows XP (was it a bug that used to be "perfect" for my needs?), but Windows 7/8/8.1 forces the MAC address to the calculated one instead of letting me put what I want! (http://nettools.aqwnet.com/ipmaccalc/ipmaccalc.php shows MAC address calculation for multicast IP address) Thus I'm doing the following. Listing existing mappings: netsh.exe interface ip show neighbors "Ethernet" Interface 12 : Ethernet Internet address Physical address Type 224.0.0.22 01-00-5e-XX-YY-ZZ static Then adding my interface mapping manually: netsh.exe interface ip add neighbors "Ethernet" "224.xxx.yyy.zzz" "00-80-EE-UU-VV-WW" Finally, listing again my mappings: netsh.exe interface ip show neighbors "Ethernet" Interface 12 : Ethernet Internet address Physical address Type 224.0.0.22 01-00-5e-XX-YY-ZZ static **224.xxx.yyy.zzz 01-00-5e-UU-VV-WW static** As you can see, the MAC Address of the second entry (the one I just made) has been dynamically replaced by the calculated MAC Address corresponding to my IP Address... Calculation is done as follow (and displayed in hexa): UU=(xxx-128) VV=yyy WW=zzz But I don't want that behavior. My IP address and MAC address cannot be changed, and I must associate them accurately. Does anybody know how to disable MAC address substitution/calculation in netsh? Thanks, Olivier.

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• Weird mouse/keyboard freezups when using PowerPoint 2007 with IBM/Lenovo docking station

  - by DanM

  I'm not sure what part of my system is responsible for this, but when using PowerPoint, I have problems when trying to resize drawing objects. I'll be dragging the handle and suddenly, the object will deselect and whatever is behind the object will select and start moving around. Next thing I know, the keyboard won't type anymore, and the only way to fix it is to unplug the USB and plug it back in. In case it's hardware related, I'm using an IMB Thinkpad T60P in a docking station. My keyboard is a Microsoft Natural Keyboard Pro. My OS is Windows XP SP3. I've never noticed this happening in anything besides PowerPoint, and I don't know anyone else who has this problem (even people with similar setups). Any ideas what it could be? Edit Well, it looks like I only get the problem if I plug the mouse into my docking station's USB. If I plug directly into the laptop's USB, everything works fine. And, again, this problem is only with PowerPoint. I tried playing with some drawing objects in Word and had no issue no matter where my mouse was plugged in. I should also mention I tried a different mouse (a standard Microsoft corded mouse instead of my Logitech trackball), but that made no difference. So, I don't think it's anything specific with the trackball or the trackball's driver. I tried searching Google but came up empty, so I'm guessing this problem is something unique to my setup. If you have any thoughts or ideas to try, I'd love to hear them.

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• Vim: Custom Folding function done, custom highlighting required

  - by sixtyfootersdude

  I have defined a function in vim to properly indent folds. Ie so they look like this: Unfolded this is text also text indented text indented text not indented text folded with default function this is text also text +-- 2 lines: indented text ---------------------------- not indented text folded with my new function this is text also text ++- 2 lines: indented text ---------------------------- not indented text The only problem is the the highlighting is still like this: folded with my new function (highlighting shown with tag) this is text also text <hi> ++- 2 lines: indented text ----------------------------</hi> not indented text I would like the highlighting to start at the ++ and not at the beginning of the line. I have looked in the vim manual but could not find anything like that. One so-so solution I found was to make the background black. highlight Folded ctermbg=black ctermfg=white cterm=bold But this make folds less visible. I have tried several variations of: syn keyword Folded lines syn region Folded ... But I don't think that this is the way that folds are selected. Can anyone offer a suggestion? By the way this is my function to indent the folds: set foldmethod=indent function! MyFoldText() let lines = 1 + v:foldend - v:foldstart let ind = indent(v:foldstart) let spaces = '' let i = 0 while i < ind let i = i+1 let spaces = spaces . ' ' endwhile let linestxt = 'lines' if lines == 1 linestxt = 'line' endif return spaces . '+' . v:folddashes . ' '. lines . ' ' . linestxt . ': ' . getline(v:foldstaendfunction endfunction au BufWinEnter,BufRead,BufNewFile * set foldtext=MyFoldText() By the way thanks to njd for helping me get this function setup.

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• Subversion 1.6 + SASL : Only works with plaintext 'userPassword'?

  - by SiegeX

  I'm attempting to setup svnserve with SASL support on my Slackware 13.1 server and after some trial and error I'm able to get it to work with the configuration listed below: svnserve.conf [general] anon-access = read auth-access = write realm = myrepo [sasl] use-sasl = true min-encryption = 128 max-encryption = 256 /etc/sasl2/svn.conf pwcheck_method: auxprop auxprop_plugin: sasldb sasldb_path: /etc/sasl2/my_sasldb mech_list: DIGEST-MD5 sasldb users $ sasldblistusers2 -f /etc/sasl2/my_sasldb test@myrepo: cmusaslsecretOTP test@myrepo: userPassword You'll notice that the output of sasldblistusers2 shows my test user as having both an encrypted cmusaslsecretOTP password as well as a plain text userPassword passwd. i.e., if I were to run strings /etc/sasl2/my_sasldb I would see the test users' password in plaintext. These two password entries were created with the following subversion book recommended command: saslpasswd2 -c -f /etc/sasl2/my_sasldb -u myrepo test After reading man saslpasswd2 I see the following option: -n Don't set the plaintext userPassword property for the user. Only mechanism-specific secrets will be set (e.g. OTP, SRP) This is exactly what I want to do, suppress the plain text password and only use the mechanism-specific secret (OTP in my case). So I clear out /etc/sasl2/my_sasldb and rerun saslpasswd2 as: saslpasswd2 -n -c -f /etc/sasl2/my_sasldb -u myrepo test I then follow it up with a sasldblistusers2 and I see: $ sasldblistusers2 -f /etc/sasl2/my_sasldb test@myrepo: cmusaslsecretOTP Perfect! I think, now I have only encrypted passwords.... only neither the Linux svn client nor the Windows TortoiseSVN client can connect to my repo anymore. They both present me with the user/pass challenge but that's as far as I get. TLDR So, what is the point of SVN supporting SASL if my sasldb must store its passwords in plaintext to work?

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• SNAT through Racoon IPSec VPN

  - by Mite fine d'ailes

  I am trying to route traffic from a device (that I will call "target") connected to my Ubuntu box (that I will call "host") to servers at a remote office. The host uses a Racoon IPSec VPN, connected through a NIC called efix. This creates an aliased IF called efix:0 which has IP adress 192.168.190.132. It is able to reach the servers. The link between host and target is an Ethernet link, using IP adresses 10.0.0.1 on IF eusb for the host and 10.0.0.2 on IF eth0 for the target. I have setup the following routes and iptables entries: On target: 10.0.0.0 * 255.255.255.0 U 0 0 0 eth0 default 10.0.0.1 0.0.0.0 UG 0 0 0 eth0 On host: echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -A POSTROUTING -s 10.0.0.0/24 -j SNAT --to 192.168.190.132 iptables -A FORWARD -s 10.0.0.0/24 -j ACCEPT iptables -A FORWARD -d 10.0.0.0/24 -j ACCEPT Using Wireshark to monitor an HTTP GET, I can see SYN packets from the target go all the way to the server, but the server's SYNACK packets stop at the host and are not forwarded to the target. Am I missing something here ? Isn't SNAT supposed to keep track of the connections ?

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• cpanel dns only / rdns questions

  - by Clear.Cache

  I started getting IPs from ARIN directly, instead of the data center I'm colocated at. Now I have to start applying rdns myself for my clients upon request, instead of having the NOC at the DC do this. That is obvious, since I am in full control over the IP delegation and therefore have nameserver authority. The question is, how do I "create" ptr / rdns records for my clients? My current server uses Cpanel / WHM with ns1/ns2.mycompany.com I also applied those as dns nameservers in the ARIN IP's whois record. How do I create rdns for my clients? Should I install Cpanel DNS Only on a entirely separate server and use this method instead? http://layer1.cpanel.net/ If so, how can I seamlessly transition over the dns records to that new dns server, retaining my ns1/ns2.mycompany.com and their ns1 and ns2 IP addresses? Even more important: I have to change the ns1/ns2 IPs to the new ones I retrieve from ARIN. How can this be done, avoiding downtime during the dns transition? On a side note, would it be easier to just install Cpanel DNS Only on a dedicated server and just use dns1.mycompany.com and dns2.mycompany.com with their own dedicated ns1/ns2 IPs from ARIN - and utilize this dns server for customers who request rdns? Would this be a more viable solution than using our current ns1/ns2.mycompany.com Nameservers? Is Cpanel DNS Only a standalone software that does not require Cpanel/WHM on another server? Is it possible to have redundant dns servers setup using this software solely, ns1 on one server and ns2 on another? Thanks.

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• Using VLANs/subnetting to separate management from services?

  - by YouAreTheHat

  Background: I recently purchased a server and a managed switch for my home in the hopes of getting more experience and some fun toys to play with. The devices and appliances I either have or plan to have cover a broad spectrum: router, DD-WRT AP, Dell switch, OpenLDAP server, FreeRADIUS server, OpenVPN gateway, home PCs, gaming consoles, etc. I intend to segment my network with VLANs and associated subnets (e.g., VID10 is populated by devices on 192.168.10.0/24). The idea is to secure the more sensitive appliances by forcing traffic through my router/FW. Setup: After thinking and planning for some time, I have tentatively decided on 4 VLANs: one for the WAN connection, one for servers, one for home/personal devices, and one for management. In theory, the home VLAN will have limited access to the servers, and the management VLAN will be totally isolated for security. Question: Since I want to restrict access to management interfaces, but some appliances have to be accessible to other devices, is it possible/wise to have only management (SSH, HTTP, RDP) available on one VLAN/IP and only services (LDAP, DHCP, RADIUS, VPN) available on other? Is this a thing that is done? Does it gain me the security I think it does, or hurt me in some way?

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• Which apache/mysql/php package is best for windows?

  - by crosenblum

  I have tried appservnetwork, was the best so far, but I haven't seen them do an update in ages, EasyPHP is just slow to load always. Wamp and Xamp, all put in their description that is not for production. I do not plan to host publicly this site or site's I am working on. But I do want a fast loading apache/mysql/php server for development purposes. I used to really like WLMP, which is Lighttpd for Windows, but that project seems unupdated or abandoned. I refuse to use IIS, but i have no desire to get into any wars over it. I run windows xp sp3 at my home pc. I will need to have a web server setup for professional work, as well as some fun websites I am working on. I just want it fast enough, so i can run it via localhost, and not take forever to load in the browser. Thank you... I plan mostly do php programming and perhaps coldfusion via this.

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• Auto load balancing two node Cluster Hyper-v 2008 R2 enterprise?

  - by Kristofer O

  My setup is a 2 node cluster with 72GB ram each and a ~10TB MD3000i Iscsi SAN. I have about 30VMs running I keep about 15 on either server. I do a live migration to the other server if I need to run updates or whatever... Either one of the servers is able of running all VM if needed, but the cpu is pretty high. Here's my issues. I know Hyper-v has a limit of a single Live-migration at a time. But Why doesn't it queue them up to move one at a time? If I multi select I don't get the option to live migrate a one at a time. OR if I'm in the process of Migrating one it will give me an error that it's currently migrating a VM... Is there a button I missed that will tell a Node that it needs to migrate all the VMs elsewhere? Another question, does anyone know whats the best way to load balance VMs based on CPU and/or network utilzation. I have some VMs that don't do much. and some that trash the CPU or network. I'd like to balance it out on both servers if at all possible. and Is there any way to automate it? last question... If I overcommit my Cluster is there a way to tell the cluster that I want certian VMs the be running and to savestate other VMs based on availible system resources? Say when my one node blue screens and the other node begins starting the VMs up. I want the unimportant ones to shutdown or savestate so the important ones can stay running or come back online. Thanks just for reading all that. Any help would be great.

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