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• MTU, DSL router and stalling TCP

  - by user38843

  I am discovering stalling TCP connection problem. The problem arises when I try to scp stuff from remote system from my home network. My home network is connected to internet via PPPoE (ADSL+) and everything works perfectly once working from my home network. The ADSL router has MTU set to 1492 but with that setting the scp from remote system does not work - stalling! When I change the MTU on my router to 1500 the that scp works perfectly but internet accesses from my home network is very slow to most of the www sites - even local ones. Just wondering where the problem exists - my ISP blocking ICMP, etc? Thanks!

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• Slow NFS transfer performance of small files

  - by Arie K

  I'm using Openfiler 2.3 on an HP ML370 G5, Smart Array P400, SAS disks combined using RAID 1+0. I set up an NFS share from ext3 partition using Openfiler's web based configuration, and I succeeded to mount the share from another host. Both host are connected using dedicated gigabit link. Simple benchmark using dd: $ dd if=/dev/zero of=outfile bs=1000 count=2000000 2000000+0 records in 2000000+0 records out 2000000000 bytes (2.0 GB) copied, 34.4737 s, 58.0 MB/s I see it can achieve moderate transfer speed (58.0 MB/s). But if I copy a directory containing many small files (.php and .jpg, around 1-4 kB per file) of total size ~300 MB, the cp process ends in about 10 minutes. Is NFS not suitable for small file transfer like above case? Or is there some parameters that must be adjusted?

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• loadbalancing with difference nginx location context and backend context

  - by robinmag

  Hi, I used nginx and upstream module for load balancing with the following config upstream lb { server 127.0.0.1:8080; server 127.0.0.1:8081; } server { listen 88; server_name localhost; location /cas/ { proxy_pass http://lb; proxy_redirect off; proxy_connect_timeout 2; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } the problem is the "location /context/" have to match to the context of backend server so when i request localhost/context/index.html then nginx routes it to 127.0.0.1:8080/context/index.html or 127.0.0.1:8080/context/index.html. Is it possible to have difference backend context and nginx location for example with "location /" nginx will routes the request to 127.0.0.1:8080/context/index.html or 127.0.0.1:8080/context/index.html Thank you.

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• Duplicate IP address detection with multiple NICs

  - by sfink

  I am using arping -D to detect duplicate IP addresses within a network when setting up servers. (The network is controlled by someone else, and we have had many issues with IP allocation in the past.) It works fine as long as my host has a single NIC on a given VLAN, but when my host has more than one (I have one with 9 NICs on one VLAN and 1 on the other), arping -D always returns false collisions. The problem is that all 9 of my NICs respond to an ARP request for any of the IPs on those NICs. (These are real physical NICs, not aliases or anything.) I send out one ARP request packet, and get 9 ARP is-at ARP replies, one for each MAC address. I could implement my own solution by sniffing packets and checking for any replies with a MAC address other than the local NICs', but it seems like there ought to be an easier way.

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• Android emulator performance on linux

  - by Rado

  I installed the android SDK and eclipse plugin on my laptop, but I was surprised to find out that the emulator eats up 100% of one of my cpu cores. I have exactly the same setup on a desktop machine that does not have this issue. Both computers are running arch linux and both were updated yesterday. Granted, the desktop has better hardware than the laptop, but I was expecting to get closer to 50% cpu usage than 100% on the laptop. Both android virtual devices have the same specs: CPU: ARM Target: Android 2.3.3 - API Level 10 Skin: WVGA800 SD Card: 512M hw.lcd.density: 240 vm.heapSize: 24 hw.ramSize: 256 Laptop host has Intel Core 2 T7200 @ 2GHz cpu with 2Gb RAM. Desktop host has AMD Phenom II X4 940 @ 3GHz cpu with 8Gb RAM. The android emulator uses only 1 core and here are the CPU usage results: Laptop: Cpu0 : 22.8%us, 76.5%sy, 0.0%ni, 0.3%id, 0.0%wa, 0.0%hi, 0.3%si, 0.0%st Cpu1 : 11.2%us, 2.4%sy, 0.0%ni, 86.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 2055484k total, 1860304k used, 195180k free, 5276k buffers Swap: 2000088k total, 106872k used, 1893216k free, 350780k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2026 xyz 20 0 396m 207m 7192 R 100 10.3 4:11.58 emulator-arm Desktop: Cpu0 : 0.7%us, 0.0%sy, 0.0%ni, 99.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu1 : 1.3%us, 0.0%sy, 0.0%ni, 98.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu2 : 5.0%us, 1.3%sy, 0.0%ni, 91.9%id, 1.7%wa, 0.0%hi, 0.0%si, 0.0%st Cpu3 : 0.3%us, 0.3%sy, 0.0%ni, 99.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 7666324k total, 6506808k used, 1159516k free, 1650960k buffers Swap: 8988348k total, 0k used, 8988348k free, 2867300k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2811 xyz 20 0 392m 220m 6276 S 8 2.9 0:33.58 emulator-arm Is there any way I can improve the emulator performance on the laptop? [UPDATE] I ran the emulator with the same settings, on the same laptop under Win7 and after starting up, it didn't use 100% of a CPU core unlike under linux. Also, I tried running the emulator from a terminal in Linux and I get this message when I don't get it under the desktop Linux host: Could not configure '/dev/hpet' to have a 1024Hz timer. This is not a fatal error, but for better emulation accuracy type: 'echo 1024 /proc/sys/dev/hpet/max-user-freq' as root. I'm not really familiar with rtc or hpet, but it doesn't seem that max-user-freq setting does anything, I still get the same warning.

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• ¿How to set maximum downloads or sockets or whatever, in Apache and or PHP?

  - by Petruza

  I made a PHP script, running from my localhost, that streams files from a remote server and serves them. I do this so I can rename the files prior to the browser shows the dialog to save them, through header( "filename:..." ) Anyway, although the remote server allows many simultaneous file downloads at good rates, when they stream through my local apache/php I can't get more than 6 at the same time. When I try to download the 7th, the save as dialog appears as soon as the sixth download has finished. I'm almost sure this is some limit imposed by php.ini or apache's httpd.ini, but don't have a clue about which one is it. do you?

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• SSH into Fedora 17 will not work with new users

  - by psion

  I just deployed a new Fedora 17 server on the Amazon EC2. I was able to log in as ec2-user with my generated keypair, but I cannot log in under normal circumstances as a user I created. This is just a normal ssh: ssh user@ip-address Any ideas on what is going on here? EDIT: This is a snippit from my sshd_config file # To disable tunneled clear text passwords, change to no here! PasswordAuthentication no #PermitEmptyPasswords no PasswordAuthentication no EDIT AGAIN: This is the output of ssh -v. OpenSSH_5.8p2, OpenSSL 1.0.0i-fips 19 Apr 2012 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to 107.23.2.165 [107.23.2.165] port 22. debug1: Connection established. debug1: identity file /home/psion/.ssh/id_rsa type 1 debug1: identity file /home/psion/.ssh/id_rsa-cert type -1 debug1: identity file /home/psion/.ssh/id_dsa type 2 debug1: identity file /home/psion/.ssh/id_dsa-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9 debug1: match: OpenSSH_5.9 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.8 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: RSA 19:cb:84:21:a9:0e:83:96:2f:6a:fa:7d:ce:39:0f:31 debug1: Host '107.23.2.165' is known and matches the RSA host key. debug1: Found key in /home/psion/.ssh/known_hosts:5 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic debug1: Next authentication method: gssapi-keyex debug1: No valid Key exchange context debug1: Next authentication method: gssapi-with-mic debug1: Unspecified GSS failure. Minor code may provide more information Credentials cache file '/tmp/krb5cc_1000' not found debug1: Unspecified GSS failure. Minor code may provide more information Credentials cache file '/tmp/krb5cc_1000' not found debug1: Unspecified GSS failure. Minor code may provide more information debug1: Unspecified GSS failure. Minor code may provide more information debug1: Next authentication method: publickey debug1: Offering DSA public key: /home/psion/.ssh/id_dsa debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic debug1: Offering RSA public key: /home/psion/.ssh/id_rsa debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic debug1: No more authentication methods to try. Permission denied (publickey,gssapi-keyex,gssapi-with-mic).

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• Bridging VirtualBox over OpenVPN TAP adapter on Windows

  - by Sean Edwards

  I'm trying to configure a virtual machine (VirtualBox guest running Backtrack 4) with a bridged adapter over a VPN connection. The VPN is is hosted by the cybersecurity club at my university, and connects to a sandboxed LAN designed for penetration testing against various servers that the club has built. My host (Windows 7 Ultimate) connects to the VPN fine and is assigned an IP through DHCP, but for some reason the VM can't do the same thing, and I'm not sure why. It's like OpenVPN is filtering out packets from the MAC address it doesn't recognize. I want the virtual machine to bridge over the VPN connection, because our IT office has very strict policies about what you can and can't do on the network. I want to be able to run active attacks (ARP spoofing, nmap, Nessus scans) in the sandbox environment without risking the traffic accidentally going over the university network and getting my internet access revoked. Bridging over the VPN connection and running all attacks from inside the VM would solve that problem. Any idea why the host can use this interface, but the VM can't?

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• HP DL580 G5 Hyper-V networking problem

  - by mr-perfect

  Hi I have installed the hyper-v role on a DL580 G5 cluster. The host operating system is a server 2008 x64 patched to the maximum. Everything has gone fine, but if I install a guest operating system, actually a windows server 2008 x64 I can't reach the network from it. It send many packets, but don't received any, so I can't ping the external network as well. I have installed the latest drivers to the server and unintalled the network configuration utility from the physical server, but no luck. I added a legacy adapter to the guest binded to the same phisycal adapter on the host machine but it can't help Any idea welcome...

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• Setup NTPD in Ubuntu to sync Windows AD

  - by David

  I am setting up my Ubuntu 10.0.4 server to sync clock with a Windows 2008 AD. As none of the "remote" has a "*" in front (worst it had a blank space in front), does it mean no time sync source is selected? The offset just keep increasing. I tried ntpdate to the same server it worked OK. remote refid st t when poll reach delay offset jitter ============================================================================== 172.18.133.201 .LOCL. 1 u 38 64 377 0.827 277.677 58.375 Any help to fix this? Here is my ntp.conf (with all comments removed) driftfile /var/lib/ntp/ntp.drift statistics loopstats peerstats clockstats filegen loopstats file loopstats type day enable filegen peerstats file peerstats type day enable filegen clockstats file clockstats type day enable restrict -4 default kod notrap nomodify nopeer noquery restrict -6 default kod notrap nomodify nopeer noquery restrict 127.0.0.1 restrict ::1 server 172.18.133.201 iburst

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• Public IP Routing over Private GRE tunnel

  - by Paul

  I have a GRE tunnel configured between two linux boxes. The tunnel works fine. I can ping from each host the other private ip. Head privateip: 10.0.0.1 publicip: 8.8.8.8 Tail privateip: 10.0.0.2 publicip: 7.7.7.7 The public IP on Tail has the network block 9.9.9.0/23 statically routed over the 7.7.7.7 interface. The idea is to make the 9.9.9.0/23 ips work on servers on the 8.8.8.8 network. I configure the tail host to route the /23 block. I mounted a 9.9 IP on the head server. I can ping the 9.9 ip from the tail to the head. I can't ping the 9.9 ip from the public internet. I think I need to add some other routes because of gateway issues, but I can't seem to wrap my mind around it (not a router guy, just beating my way through something that I have never done before and vaguely understand) --danks

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• Can't SSH into a Vagrant Virtual Machine

  - by Christopher Ickes

  Local Vagrant machine installed at ip address 10.0.0.23 and hostname lamp-vm. Using vagrant ssh I can connect just fine and do everything I need. This creates an ERROR - ssh vagrant@lamp-vm -v -v and I get debug1: connect to address 10.0.0.23 port 22: Connection timed out ssh: connect to host lamp-vm port 22: Connection timed out My etc/hosts file contains 10.0.0.23 lamp-vm. My .ssh/config file looks like Host lamp-vm User vagrant IdentityFile ~/.ssh/vagrant I have tried the ssh command with and without the -i /path/to/.sh/identity_file as well. How do I connect to my Vagrant Virtual Machine using SSH?

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• Missing "log on to" field in Windows 2008 password change dialog

  - by Dmitri Chubarov

  I have to setup an embedded standalone CIFS server outside of domain environment. I shall refer to the server as storage_gateway. The default password setting for the Administrator account is Password must be changed. Until Administrator password is changed other local accounts are disabled. While the server is on default password connecting to a share causes fails with NT_STATUS_PASSWORD_MUST_CHANGE error. $ smbclient -L //storage_gateway -U Administrator session setup failed: NT_STATUS_PASSWORD_MUST_CHANGE I have a mixed Linux/Windows environment and prefer smbclient for diagnostics. To change the password in Windows 2003 Server I could press CTRL-ALT-DEL to get into the Windows Security window and change password for the remote server specifying the server name or ip address (xx.xx.xx.xx) in the system password change dialog. (the name root is just an example, I have edited the dialogs to translate them) However in Windows 2008 the corresponding dialog lacks the Log on to field. Is there a way to change a remote password in Windows 2008 Server/Windows 7?

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• What is the purpose of netcat's "-w timeout" option when ssh tunneling?

  - by jrdioko

  I am in the exact same situation as the person who posted another question, I am trying to tunnel ssh connections through a gateway server instead of having to ssh into the gateway and manually ssh again to the destination server from there. I am trying to set up the solution given in the accepted answer there, a ~/.ssh/config that includes: host foo User webby ProxyCommand ssh a nc -w 3 %h %p host a User johndoe However, when I try to ssh foo, my connection stays alive for 3 seconds and then dies with a Write failed: Broken pipe error. Removing the -w 3 option solves the problem. What is the purpose of that -w 3 in the original solution, and why is it causing a Broken pipe error when I use it? What is the harm in omitting it?

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• containing a remoteapp inside the browser not the desktop

  - by richardboon

  I want to host a remoteapp inside their browser not the desktop. Thanks

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• ClearOS - how to avoid getting stuck at a fsck message at boot?

  - by Scott Szretter

  I have had this happen a couple times - I have a ClearOS Enterprise 5.2 box, and due to a power outage or similar, it ends up showing an error at boot and saying that fsck needs to be run (I think it said with (or without?) the -a parameter). The problem is, I need this box to be headless, at a remote location (miles away)! SO, I need to come up with a solution on how to either have it automatically repair itself, without someone to be present with a monitor and keyboard. Another possibility is to simply avoid the issue all together - maybe there is something that can be changed so it's very unlikely to happen (I am unable to avoid the power outage of course - at least not practically). Finally, maybe it can be boot off a read only media (cd) or file system or similar? At least the base OS, so that it would always at least boot with enough configuration that might allow remote access, or basic connectivity?

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• PCs using certain IP addresses cannot ping out

  - by Steve McCall

  I'm having a very strange problem which I just can't get past. The way our network is set up, we have 2 locations. The main office with all our PCs, and servers/ We are then joined to a local ISP via microwave link and they provide our internet gateway and house an additional storage server for us. All of the network infrastructure is within our office The problem is... When some PCs (and servers) are assigned IP addresses, they cannot ping the gateway or remote server however the remote server can ping the PC. Most of our internal IP addresses work fine but specific ones (e.g. .29) has this problem all the time. There is nothing else using the ip address and no other network problems. When we switch the IP on the PC, it works fine. Please help, I'm going mad. Thanks, Steve

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• cygwin ssh connection to server port 22 connection refused on localhost

  - by Steven Wexler

  I set up a ssh server through ssh-host-config. Then I started the server. net start sshd The CYGWIN sshd service is starting. The CYGWIN sshd service was started successfully. When I try to connect I get: ssh myusername@localhost ssh: connect to host localhost port 22: Connection refused I tried to allow port 22 in Windows Firewall, but that didn't change anything. And because I'm trying to ssh locally I don't think Windows Firewall is the culprit. I'm using Windows 7 and What should I look for to fix this problem?

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• Virtualbox, Virtual guest OS issue

  - by user70370

  Hi, My host OS is: Ubuntu 10.10. One of my virtual OS is: Ubuntu 9.04 and another one is: Ubuntu 10.04. All of these virtualisation has been completed with Virtualbox. Now, I need to replicate those two servers, one server is running in Ubuntu 9.04 and another one is running in Ubuntu 10.04. Is it possible? If yes, can you please provide me some help? So, in short words, the whole thing is: Host: Ubuntu 10.10 Guest 1: Ubuntu 9.04 Guest 2: Ubuntu 10.04 Job: Must have to run two guests at a time. Because, two LDAP of two guests need to replicate. Now, If I try to get the first Guest ( hostname: mohib-laptop ) from second Guest ( hostname: zaman-laptop ), it is not getting! Do I need to change IP address of those both Guests? Or are there anything which will make it possible?

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• Virtualizor + VPS Backup (Bare Metal Restore capable) Using rSync 3

  - by Gaia

  I am using virtualizor to manage 3 XEN VPS. Hardware node and each VPS run CentOS 5.x. My backup needs are as follows: 1) I need to be able to bare metal restore the entire hardware node, excluding the VPSes (which would be restored via #2 below) 2) I need to have a complete backup of each VPS, ideally a backup that can be deployed on any other host that uses Xen, if the need arises. Naturally, I would also need to use this backup to restore an entire VPS to an earlier state within the same host. Which folders rSync needs to keep backed up in order to accomplish the above? The rSync specialists aren't sure of it either. Thanks

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• MySQL blocking new connections, and mysqladmin flush-hosts

  - by aidan

  I'm running MySQL on a remote server, and it suddenly started rejecting all connections: $ mysql -h 192.168.1.10 -u root -p ERROR 1129 (00000): Host 'web' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts' So, I try this flush-hosts command... $ mysqladmin flush-hosts -h 192.168.1.10 -u root -p mysqladmin: connect to server at '192.168.1.10' failed error: 'Host 'web' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'' I.e. it's blocking the very un-blocking tool it recommends. Am I doing it wrong, or will I have to resort to ssh/cpanel/physical access?

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• Terribly slow Apache2 on VM Virtualbox

  - by cadavre

  I just launched VM Virtualbox with guest Ubuntu Server on host Windows 8. Both 64bit. Everything works perfectly fine. Maybe it's because I'm not using any X... Htop shows ~25% of memory usage, everything is fine, but not Apache2. Normally it's fine, but when I send request from my browser on host (networking mode set to Bridge mode), Apache2 is turning into 1-minute-long loading process with 100% CPU time. Any ideas how to debug it? Any ideas about solving this throat problem?

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• Internal only DNS?

  - by ethrbunny

  We are running a research project with hundreds (becoming thousands) of remote hosts. Each host is running OpenVPN so we can find them regardless of what their 'assigned' IP is. We have been using DynDNS to manage this but we're running into some issues with them ( API is weak/nonexistent, size constraints, etc). Im looking into setting up a internal-only domain (EG "our.stuff" so a host would be "site1.our.stuff" or "site3.net4.our.stuff") that I can configure with the info from the OpenVPN server. Since we'd have to point our internal DNS to this machine it would have to be able to route/cache requests for 'external' machines as well. I've been trying to read about 'internal DNS', 'private', 'non-routeable' but I'm not having much success. Summary: need info on internal, caching DNS server. Something with open-source would be ideal. If not, I can script out changes to .conf, etc.

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• How can I make it difficult to install a new operating system on a certain computer?

  - by D W

  I want to host a website on a desktop computer running Ubuntu with a Windows virtual machine. I will give away the computer in exchange for a number of months of remote web hosting. I want to add some kind of lock (hardware or otherwise) so that the end users will have difficulty just reinstalling Windows and using the machine as they want, in contradiction to the contract. Ideally, I'd want the machine to die if reinstallation of the OS is attempted. It doesn't have to be completely insurmountable, but it has to be difficult enough to prevent casual reinstallation. Perhaps on bootup the system can check whether certain files exist on the computer and refuse to boot if they do not. I don't know if this is possible, but maybe BIOS is password protected, and searches for files before boot up. The files it looks for could be date sensitive, i.e. require remote replacement on a schedule.

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• Turnkeylinux lampp guest doesn't have internet connection

  - by dave08

  I've set up a turnkeylinux lampp server in virtualbox with two network bridged connections, one for when I'm plugged in to my router, and one for when I'm using a wireless connection. This allowed me to pull up the turnkey control panel on the host machine's browser, but when I try going into the command prompt in the guest and run an apt-get update, it doesn't seem to have an internet connection, even though it seems to have a connection with the host. What could be wrong? Thank you very much in advance for any answers...!

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