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• Routing protocols, distance vector vs link state

  - by Artem Barger

  I'm trying to figure out the differences(pros/cons) between two routing protocols approach and I would be great-full for any help, advice and explanation. As far I can say that it seems like distance vector is more static and more local based routing, since it doesn't know the network state whereas link state is more aware of current states therefore it seems more natural to use it over distance-vector, but I have a feeling like I'm missing something. And I would be glad to here about more aspects and different issues I have to consider while choosing one of them.

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• How do I get write access to ubuntu files from Windows?

  - by Steven

  I'm running Ubuntu 11.10 on my Virtual Machine as a web server. I've mounted the W:/ drive in Win 7 to my /www folder in Ubuntu. I can read the files, but I'm not able to write to the files. In Samba, I have created the following user: <www-data> = "<www-data>" And given guest ok for the www folder: [www] comment = Ubuntu WWW area path = /var/www browsable = yes guest ok = yes read only = no create mask = 0755 ;directory mask = 0775 force user = www-data force group = www-data I've also run sudo chmod -R 755 www to make ensure correct rw access. What am I missing in order to get write access to my ubuntu files from Windows?

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• Change Linux console screen blanking behavior

  - by quack quixote

  How do I change the screen blanking behavior on Linux virtual terminals? For example, if I switch to a VT from X, login, and leave the system alone for 5 minutes or so, the screen will blank like a screensaver. It comes back with any keypress, like a screensaver. Mostly I just want to change the timeout, but I'm also interested in other settings. If it helps, one of my systems is running Ubuntu 10.04 with the stock graphics drivers. fbset shows the console using the radeondrmfb framebuffer device.

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• Change Linux console screen blanking behavior

  - by quack quixote

  How do I change the screen blanking behavior on Linux virtual terminals? For example, if I switch to a VT from X, login, and leave the system alone for 5 minutes or so, the screen will blank like a screensaver. It comes back with any keypress, like a screensaver. Mostly I just want to change the timeout, but I'm also interested in other settings. If it helps, one of my systems is running Ubuntu 10.04 with the stock graphics drivers. fbset shows the console using the radeondrmfb framebuffer device.

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• /etc/hosts.deny ignored in Ubuntu 14.04

  - by Matt

  I have Apache2 running on Ubuntu 14.04LTS. To begin securing network access to the machine, I want to start by blocking everything, then make specific allow statements for specific subnets to browse to sites hosted in Apache. The Ubuntu Server is installed with no packages selected during install, the only packages added after install are: apt-get update; apt-get install apache2, php5 (with additional php5-modules), openssh-server, mysql-client Following are my /etc/hosts.deny & /etc/hosts.allow settings: /etc/hosts.deny ALL:ALL /etc/hosts.allow has no allow entries at all. I would expect all network protocols to be denied. The symptom is that I can still web browse to sites hosted on the Apache web server even though there is a deny all statement in /etc/hosts.deny The system was rebooted after the deny entry was added. Why would /etc/hosts.deny with ALL:ALL be ignored and allow http browsing to sites hosted on the apache web server?

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• Quad Core host with hyper-threading, how many processors to configure in VirtualBox?

  - by Anthony

  I have a quad-core i7 processor with hyperthreading (8 logical cores), when I configured a virtual machine to use 8 processors, VirtualBox gave me a warning saying that I only have four cores (which is true) and that this may cause a performance issue. But hyper-threading is a hardware feature, so the OS sees 8 cores and it sends instructions to all 8. What if setting it to 4 caused the VM to use 2 cores (4 threads) instead of 4 simultaneous threads (on all 4 cores)? Does the warning I got take into account that my machine has hyper-threading?

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• XP Mode under Win 7 Professional: Windows Activation Update failure despite activated Windows

  - by Cristina

  I am trying to install Windows XP Mode from here: http://www.microsoft.com/windows/virtual-pc/download.aspx (the Hardware-Assisted Virtualization Detection Tool has given me the green for proceeding) Even though my Windows has been activated a year or so ago, the download button leads me to a splash screen saying "Windows validation required". I am next forced to download a WindowsActivationUpdate.exe which, after downloading some mysterious "update", fails with the error message "Update installation failed, error information 0x80070002" (rough translation from German). I've tried running it both normally and as Administrator. What could be the problem?

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• Linux server: Dropped packets

  - by Lars

  I see dropped packets using ifconfig on my eth0 interface: eth0 Link encap:Ethernet HWaddr 00:15:17:0d:03:ca inet addr:10.0.1.2 Bcast:10.0.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:9000 Metric:1 RX packets:30268348 errors:0 dropped:70721 overruns:0 frame:0 TX packets:133076885 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:8699434077 (8.6 GB) TX bytes:194937313025 (194.9 GB) Interrupt:16 Memory:feae0000-feb00000 When i use ethtool -S i dont see anything wrong: NIC statistics: rx_packets: 30267138 tx_packets: 133074510 rx_bytes: 8699356158 tx_bytes: 194934147340 rx_broadcast: 35296 tx_broadcast: 5435 rx_multicast: 0 tx_multicast: 0 rx_errors: 0 tx_errors: 0 tx_dropped: 0 multicast: 0 collisions: 0 rx_length_errors: 0 rx_over_errors: 0 rx_crc_errors: 0 rx_frame_errors: 0 rx_no_buffer_count: 0 rx_missed_errors: 0 tx_aborted_errors: 0 tx_carrier_errors: 0 tx_fifo_errors: 0 tx_heartbeat_errors: 0 tx_window_errors: 0 tx_abort_late_coll: 0 tx_deferred_ok: 0 tx_single_coll_ok: 0 tx_multi_coll_ok: 0 tx_timeout_count: 0 tx_restart_queue: 0 rx_long_length_errors: 0 rx_short_length_errors: 0 rx_align_errors: 0 tx_tcp_seg_good: 5757001 tx_tcp_seg_failed: 0 rx_flow_control_xon: 8649 rx_flow_control_xoff: 62072 tx_flow_control_xon: 0 tx_flow_control_xoff: 0 rx_long_byte_count: 8699356158 rx_csum_offload_good: 30212111 rx_csum_offload_errors: 0 rx_header_split: 10857552 alloc_rx_buff_failed: 0 tx_smbus: 0 rx_smbus: 0 dropped_smbus: 0 rx_dma_failed: 0 tx_dma_failed: 0 I am running Ubuntu 12.04 with kernel 3.2.0-30-generic #48-Ubuntu SMP I have pinged every device on my internal network for about 24 hours, without packet loss. Also checked my router and my interface to the WAN, also no errors there. Does anyone have any clue?

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• Exporting a VM running as a Domain Controller

  - by AndyM

  There is a Microsoft KB article that talks about best practices for running a DC on a VM. One of the notes is "Do not use the Export feature on a virtual machine that is running a domain controller". In order to export a VM, the VM needs to be turned off. If you turn off a DC VM, export it, import it on another server and then power the VM back on, there should be no risk as long as the original (exported) VM is never powered back on. Can someone explain to me why this isn't supported? After doing some searching on Google, the sites I found just regurgitated this line from the KB article, but didn't offer any explanation as to why this isn't supported.

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• how do i automatically add a new route to the routing table?

  - by Robbie Mckennie

  I'm looking at linking two networks with a long range Ethernet bridge. I know I can connect my two networks with a router, but my problem is how will my computers know where to send packets if I don't add the route manually? I COULD add them manually, but it seems like a hassle. I have very very limited knowledge of RIP (I know it has something to do with routing), but I don't know how to use it. edit: My vision for the network would be the 2 networks (which are currently independent home networks), connected by a microwave Ethernet link. I assumed i'd need a router on one end of the bridge, to handle communication between the 2 networks.

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• How to check use of userva boot option on Win 2K3 server

  - by Tim Sylvester

  I have some 32-bit Win2K3 servers running an application that fails now and then apparently due to heap fragmentation. (Process virtual bytes grows, private bytes does not) I do not have access to the source code or build process of this application. I have modified the boot.ini file on one of these servers to include /userva=2560, half way between the normal mode of operation and the /3GB option. Normally it takes weeks to reach the point of failure, but I'd like to see right away whether this has actually had any effect. As I understand it, this option limits the kernel to the remaining address space (1536MB instead of 2048), but does not necessarily give an application the extra address space, depending on the flags in the application's PE header. How can I determine whether the O/S is allowing a particular application, running in production, to access address space above 2GB? Additionally, what's the best way to monitor the system to ensure that the kernel is not starved for address space, and more generally how should I go about finding the optimal value for this setting?

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• VMWare ESX installation on sata disk

  - by ilansch

  I have a PC with Gigabyte H77 motherboard with Intel I5-3550 CPU 8 GB RAM 1600MHz and a 500GB Harddisk (7200RPM) - WD Sata III disk I wish to install esx on it and run some virtual machines on it. not alot, something like 2-3 VMs. My hardisk is Sata, is it possible to install ESX Server on it ? I am not worried about loading issues. When i try loading the installation it writes it cannot detect my disk (since its not SCSI disk). How can i bypass this ? or find a solution. thanks

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• What is the difference between a plain Amazon ec2 instance and beanstalk?

  - by Alex Ford

  I am a solo developer and the sites I'm deploying are very small, usually hobby sites and I have a few questions about the Amazon services. Is there a reason for me to use beanstalk or should I just stick with a single ec2 instance? Should I use RDS for database? I heard someone say that I could just install a database on my ec2 instance, making it cheaper. I'm trying to keep everything as cheap as possible. I need to point custom domains to my sites. Pretty sure that means I have to deal with elastic IPs. Do those work with beanstalk or only with individual ec2 instances? Thanks in advance!

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• Cannot deploy reports on localhost/reports

  - by Jackson Sunuwar

  I am using Microsoft SQL Server 2008 R2, Sql Server Reporting Services(SSRS) on an xp virtual machine.. I have created a report and am trying to deploy it... but getting this error... The specified report server URL http://localhost/Reports could not be found. Verify the syntax of the URL and that the report server exists. I went to see my "services".... SQL Server (SQLEXPRESS) is "started", but SQL Server (MSSQLSERVER) is not. When I try to start it, it says windows could not start the sql server on local computer error code 10048 I tried to go in cmd and tried C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Binn\sqlservr.exe -sMSSQLSERVER I get this, Server Error: 17058, Severity: 16, State: 1. can someone please help me...

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• How to prevent asymmetric routing with multiple eBGP routers?

  - by Andy Shinn

  I have 2 routers announcing a /22 subnet to different providers (one providers connects to each of the 2 routers). I have split the /22 in two /23 to announce one /23 on each of the routers plus the /22 (the providers will take the more specific route). This allows me to fail over and keep traffic inside the /23 in and out the same provider. What are other ways in which I could announce just the /22 with both routers and have packets from servers on the network behind the routers go back out the same router in which they came in from? EDIT: The main problem I come across, which end users and clients complain about the most, is that the least hop route is sometimes not the "optimal" route. In my case, I know that Provider B may have better latency to X nation. But when packets come in from provider B, they may go out Provider A or provider B. The reverse is also true. If I send a packet to X nation out provider A, even though it may have more hops back, the packet will likely come in from Provider B (which may have higher latency, packet loss, etc. to this nation)

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• Able to ping but does not get the data

  - by Dany

  I am facing a problem in my client server program; when using wireless I can ping but not receive any data. There is a source which receives a streaming request from client via server. This works fine when all the machines are connected through LAN cable but when I put all the computers in wi-fi network, all the machine are able to ping each other but when the client send the stream request to the server the ping request between server and client says destination unreachable. It works all well until the client does not send the streaming request. What might be the issue?

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• Xmodmap configuration

  - by Krishna S

  On my Debian Linux machine Ctrl+Alt+F1 is bound to a virtual terminal. I can see the corresponding entry by running xmodmap -pke keycode 67 = F1 XF86_Switch_VT_1 F1 XF86_Switch_VT_1 Per this thread, which I might add is consistent with what I've read elsewhere, the columns on the right hand side of = correspond to key, Shift+key, AltGr+key and Shift+AltGr+key. Given that, I don't understand how the keycode mapping for F1 (above) works for Ctrl+Alt+F1. It seems it should really be either Shift+F1 or Shift+AltGr+F1? Here's the output of xmodmap -pm on my machine: shift Shift_L (0x32), Shift_R (0x3e) lock Caps_Lock (0x25) control Control_L (0x42), Control_R (0x69) mod1 Alt_L (0x40), Alt_R (0x6c), Meta_L (0xcd) mod2 Num_Lock (0x4d) mod3 mod4 Super_L (0x85), Super_R (0x86), Super_L (0xce), Hyper_L (0xcf) mod5 ISO_Level3_Shift (0x5c), Mode_switch (0xcb) Can anybody explain it?

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• Is it possible, and is it advisable, to host a mail server on a Windows Azure VM role?

  - by JcFx

  I know this question has been asked on various forums before, and that all the answer were negative, but many of the answers are quite old, and with Azure developing so quickly it seems useful to ask it again. Can we run a mail server (such as mailenable) on an Azure VM? And if not, why not? I've seen one posting on the MS forums (here) that suggests the IP of the Azure machine would be blacklisted as a source of spam. Why would this be (as opposed to hosting a mailserver on a dedicated box)?

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• What about IPv4 class E?

  - by Luc

  IPv4's class E network (240.0.0.0/4) contains 268 million addresses. Despite the advertisements for IPv6, claiming we have ran out of address space, this block ironically still claims to be "Reserved for future use". Why hasn't this block been freed up yet? Of course, IPv6 should be promoted instead of freeing up more IPv4 addresses, but we've seen the address shortage coming for years. There has even been a time they weren't sure there was enough time to develop IPv6 before we would run out of addresses. Why didn't they free up this block already? And is there any chance these addresses will be used in the future, like when IPv6 is fairly widely implemented but we still need IPv4 for backwards compatibility? It will be phased out regardless, but then ISPs don't have to employ NAT for IPv4 compatibility.

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• Simple IPV6 Address Question

  - by Daniel

  Hello, I have a /96 block of IPV6 addresses and i'm wondering how i could some how find the next address (Since ipv6 addresses can contain numbers and letters). I know the first address could be in numbers but i've yet to find out how i could really find in some kind of order for that amount of addresses E.G: What technique could i use to make sure i'll actually be able to use all of the addresses

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• Can't get IPv6 address using radvd on wireless interface on windows, wired works fine.

  - by AndrejaKo

  I set up my router to use OpenWRT and set it up to use IPv6 using a tunnel form SixXs. I'm having problems with stateless autoconfiguration using radvd. On my computer, wired connection can get its IPv6 address fine, but wireless can't. After spending some time on OpenWRT forums, I'm pretty much sure now that router is set up fine and that the problem is with my windows settings. Also, I do not have any problems getting IPv6 address on openSUSE 11.3. So what should I do to solve this and what information should I post? Here's radvdump output for wired interface: interface br-lan { AdvSendAdvert on; # Note: {Min,Max}RtrAdvInterval cannot be obtained with radvdump AdvManagedFlag on; AdvOtherConfigFlag on; AdvReachableTime 0; AdvRetransTimer 0; AdvCurHopLimit 64; AdvDefaultLifetime 1800; AdvHomeAgentFlag off; AdvDefaultPreference medium; AdvSourceLLAddress on; prefix 2001:15c0:67d0::/64 { AdvValidLifetime 86400; AdvPreferredLifetime 14400; AdvOnLink on; AdvAutonomous on; AdvRouterAddr off; }; # End of prefix definition }; # End of interface definition Here's radvdump output for wireless interface: # # radvd configuration generated by radvdump 1.6 # based on Router Advertisement from fe80::a0b7:deff:fef0:5b34 # received by interface br-lan # interface br-lan { AdvSendAdvert on; # Note: {Min,Max}RtrAdvInterval cannot be obtained with radvdump AdvManagedFlag on; AdvOtherConfigFlag on; AdvReachableTime 0; AdvRetransTimer 0; AdvCurHopLimit 64; AdvDefaultLifetime 1800; AdvHomeAgentFlag off; AdvDefaultPreference medium; AdvSourceLLAddress on; prefix 2001:15c0:67d0::/64 { AdvValidLifetime 86400; AdvPreferredLifetime 14400; AdvOnLink on; AdvAutonomous on; AdvRouterAddr off; }; # End of prefix definition }; # End of interface definition # # radvd configuration generated by radvdump 1.6 # based on Router Advertisement from fe80::a0b7:deff:fef0:5b34 # received by interface br-lan # interface br-lan { AdvSendAdvert on; # Note: {Min,Max}RtrAdvInterval cannot be obtained with radvdump AdvManagedFlag on; AdvOtherConfigFlag on; AdvReachableTime 0; AdvRetransTimer 0; AdvCurHopLimit 64; AdvDefaultLifetime 1800; AdvHomeAgentFlag off; AdvDefaultPreference medium; AdvSourceLLAddress on; prefix 2001:15c0:67d0::/64 { AdvValidLifetime 86400; AdvPreferredLifetime 14400; AdvOnLink on; AdvAutonomous on; AdvRouterAddr off; }; # End of prefix definition }; # End of interface definition

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• How to set up a PC which can be booted from Linux AND Windows?

  - by Martin

  Our PC was running Windows XP up to know. It has become incredibly slow and I'm considering switching to Linux (Ubuntu?!) as a fresh OS. However, there are some applications we rarely use which run only on Windows and I also want to have the possibility to easily go back to the old system, if I should find during testing linux, that anything is missing or not available. So the idea is to install Linux on a new (second) hard drive and use the existing Windows XP from a virtual machine (converted by Paragon Drive Backup) in the transition time. We have a lot of data on the PC, tens of GBs of Photos (managed by Picasa), ... My questions: What could be the best way to setup the new hard drive? (Partitions) I assume that I can not access the Linux data from Windows but I could access (read/write) windows drives from Linux? Does anyone know good tutorials for this use case? What other things might I have to consider for transition Windows-Linux?

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• Minimize VirtualBox Hard Drive disk

  - by Aviv

  I have Ubuntu Server 10.04 TLS installed on a Virtual Machine in a VirtualBox. The size of the Hard Drive is dynamic growing hard drive and the maximum is 32GB. At the beginning i had 4GB on the Hard Drive and the size of the .vdi was 4GB. Lately the size of data on the disk is 15GB but the size of the .vdi is almost 32GB. Why is that? How can i pack / optimize / defrag the HD so it will be the same size of the data on the disk? Thanks.

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• How to Access an AWS Instance with RDC when behind a Private Subnet of a VPC

  - by dalej

  We are implementing a typical Amazon VPC with Public and Private Address - with all servers running the Windows platform. The MS SQL instances will be on the private subnet with all IIS/web servers on the public subnet. We have followed the detailed instructions at Scenario 2: VPC with Public and Private Subnets and everything works properly - until the point where you want to set up a Remote Desktop Connection into the SQL server(s) on the private subnet. At this point, the instructions assume you are accessing a server on the public subnet and it is not clear what is required to RDC to a server on a private subnet. It would make sense that some sort of port redirection is necessary - perhaps accessing the EIP of the Nat instance to hit a particular SQL server? Or perhaps use an Elastic Load Balancer (even though this is really for http protocols)? But it is not obvious what additional setup is required for such a Remote Desktop Connection?

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• Host forwarding fails, server is up, domain name tests ambiguous

  - by jayunit100

  I have a domain name registered with http://www.registryrocket.com/ The "main" site, which is called rudolfcode.net, is registered under godaddy, and forwards to a heroku site (rudolfcode.herokuapp.com). I have found that the main site, rudolfcode.net works, but the hostgator forwarding has stopped working (firefox simply fails when you point to http://www.rudolflabs.com, which is the domain name registered by hostgator). How can I debug this issue ? Finally, I have tried to run some DNS tests, and here are the results : Im not sure what the failures mean .... But Im pretty sure that "Conecting to WWW Home Page" failed is a pretty bad sign ! Thanks.

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