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• Computer sending data while turned off

  - by Nicklas Ansman

  I have a some what strange problem (which could have and easy and obvious solution for all I know). My problem is that when I've booted ubuntu (now 10.4 but same problem with 9.10) and turns it off it starts sending a HUGE amount of data via the ethernet cable, so much in fact that my router can't handle it and stops responding. As far as I can tell the computer is completely turned off with no fans spinning. I can add that if I boot windows I do not have this problem, just when exiting ubuntu. There are two "fixes" for my problem: Pull the ethernet cable until the next boot Turn off power to the PSU and wait for the capacitors to unload Is there anyone who knows what could be going on? I'd be happy to post some logs or conf-files. Currently I'm using the ethernet port on my motherboard which is a Asus P6T Deluxe V2 with an updated version of the BIOS (maybe not the latest but since it only happens when I've been in ubuntu I don't wanna mess with the BIOS too much). Regards Nicklas ---------Update 1---------- The router is a D-Link DIR 655 with the latest firmware. ---------Update 2---------- I've now reinstalled ubuntu (with 10.4) and I still experience the same problem.

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• Configuring a MySQL 5.1 Instance on Windows 7 Professional x64 Fails

  - by Thomas Owens

  I'm trying to set up my laptops to function as mobile development environments. Installing the software on my Linux machine and getting it configured was fairly straightforward, however I'm having trouble getting MySQL 5.1 Server installed and configured on Windows 7 Professional 64-bit. I'm currently using the Windows MSI Installer for the complete MySQL 5.1 system (as opposed to the Essentials installer also available). I've tried to install using both the 32-bit and 64-bit versions of MySQL 5.1 - the same events occur in both. I've installed both the Server Instance Configuration Wizard and Workbench and everything appears to be installed just fine. When I open the Instance Configuration Wizard, I select Detailed Configuration. On the next screen, I select Development Environment, then Multifunctional Database on the next screen. I leave the InnoDB settings unchanged. I select Manual Setting with 5 concurrent connections. I enable TCP/IP Networking on Port 3306 and Enable Strict Mode. I select the Standard Character Set. I check the boxes for Install as a Windows Service (and provide the name "MySQL") and Include the Bin Directory in Windows PATH. On the next screen, I set my root user name and password. I do not enable root access from remote machines and I also do not create an anonymous account. On the final screen of the wizard, when I click "Execute", the first two tasks (Prepare Configuration and Write Configuration File) complete. However, when it reaches Start Service, the wizard hangs and becomes unresponsive ("Not Responding" appears in the title bar and Task Manager). I would really like to be able to use both my Windows and Linux laptops as full-blown mobile development environments, but I can't do that without being able to run MySQL. Has anyone encountered this problem before? What options do I have to correct it?

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• Setting up VPN with Snow Leopard Server and Linksys router

  - by SueP

  I'd like to get VPN going so I can log in to the office securely from home. I'm using Snow Leopard machines everywhere, and currently have Airport Extremes set up at home and at the office. I have a mac mini with Snow Leopard Server that I'm going to move to the office to act as my server. I just bought a Linksys 4-port router because it says it does VPN (model RVS4000). My problem is, I don't have a clue how to set this thing up, and the more reading I do, the more confused I get. Do I need two of these routers, one at each end? My laptop and iPad claim they can do VPN, so I was assuming I only needed one VPN router? At this point, I literally don't know what questions to ask, or where to plug this thing in. Presumably, between the modem and the airport, but...? If somebody can walk me thru some really basic setup, I'd be very grateful. Right now, I feel like going outside and screaming for a while. But that might attract the local cougar, and after the prints I saw on the arena this afternoon, I don't want to draw its attention. :-)

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• Trouble connecting to a local SQL server instance from the web

  - by dfarney

  We have a small network behind a firewall (WatchGuard XTM 2 series) and network switch. On our network we have multiple instances of SQL server, but 1 in specific that I would like to be able to access remotely from our website. We have a static IP address from our ISP and then all the machines on the network have a locally assigned dynamic IP address. When trying to connect to the database from outside our network how do I get the request to be directed to the proper machine / SQL instance? Is it a parameter in my connection string or something in my firewall? A few things to rule out: 1) The firewall is allowing access from the website to our network. I added the site's IP and opened up port 1433. Also, when trying to connect and monitoring the firewall no exceptions come up as they did before I added the proper IP address. 2) Remote connections on the SQL server has been setup and enabled. I've done a lot of reading up on remote connections and I am sure it has been setup properly. I am currently getting this error message on my site: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.)

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• Equivalent of scp -l bandwidth_cap for .ssh/config?

  - by Mark Bennett

  Short form: You can limit the bandwidth the scp uses with the -l switch, you pass a number that's in kbits/sec. I'd rather set this in my .ssh/config file for certain names machines. What's the equivalent named setting for -l ? I haven't been able to find it. Followup question: Generally, not sure how to map back and forth between ssh command line options and config names, short of doing Google searches or manually comparing man pages on a case by case basis. Is there a table that directly equates the two? Longer form of first question, with context: I've started using ssh config quite a bit, especially now that I need to go through a proxy and do lots of port mappings. I even define the same machine more than once depending on what type of tunneling I need. However, when uploading a large file, it's difficult to do anything else on my machine. Even though I have more download bandwidth than up, I think that scp saturates the link so even my small requests can't reach the Internet. There's a fix for this, using the -l bandwidth command line switch for scp. scp -l 1000 bigfile.zip titan: I'd like to use this in my config instead, so I'd create an additional named entry called "titan-upload" and I'd use that as the target whenever I upload. So instead of: scp bigfile.zip titan: I'd say: scp bigfile.zip titan-upload Or even set different caps depending on where I am: scp bigfile.zip titan-upload-from-home vs. scp bigfile.zip titan-upload-from-work I'm generally on Mac and Linux.

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• IIS not responding with SSL Server Hello

  - by Damien_The_Unbeliever

  I'm having difficulty getting a particular IIS machine to "do" SSL. This is a test environment (one of many) which we've set up "the same" as we have many times previously, but it just doesn't seem to be working. The server is Windows Server 2003 (Version 5.2 (Build 3790.srv03_sp2_gdr.100216-1301 : Service Pack 2)) IIS is hosting 4 sites (including the default site), but only one site is configured for SSL. We're using the same SSL certificate we use on all of our other servers (it's a wildcard cert). (Don't think this is relevant, but including anyway) We've configured the site to require SSL, it has a subdirectory that doesn't require SSL but has an asp page that redirects into SSL. The 403;4 error page for the site is hooked up to this asp page (this is how we do our non-HTTPS into HTTPS transition). Using Microsoft Network Monitor (3.3), I've just run a session against a server where SSL is working. It can pull apart the SSL exchange as the following messages: SSL: Client Hello SSL: Server Hello. Certificate. Server Hello Done SSL: Client Key Exchange. Change Cipher Spec. Encrypted Handshake Message. SSL: Change Cipher Spec. Encrypted Handshake Message However, on our problem server, I only see: SSL: Client Hello. The next packet from the server (from port 443, so it's listening and responding there) contains only 60 bytes, and just seems to have the Tcp headers and not much else (but I'm by no means an expert at deciphering these things). So, where do I look next? Or what additional information do I need to add to this question, and where do I find it?

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• Why are ISP's installing routers on my site when the feed is a form of ethernet already?

  - by Cosmin Prund

  I'm connected to 3 ISP's right now. Two of them already have routers at my site, the third one announced me "they need to install some equipment" when I requested BGP session. I can only assume they need to install a Router, since that connection is now working fine, using the usual /30 net block for the connection, and the "last-mile" solution is not going to change since they only installed it last week and the BGP was in the contract from the beginning. I simply don't understand this: the "feed" is already a form of ethernet. Even those they're using different technologies for the last mile, they're all entering the ISP router using an RJ45 WAN port. I assume the ISP router does something really important that can't be done by the Big Router on the other end of the connection. It must also be something that can hurt them if miss-configured, since they don't trust us (the client) to do the stuff on our router. And I'm not talking cheap throw-away routers here: One of the routers is Cisco 2800. Edit to add network details: I'm connected to 3 ISP's, two over Radio links, one over Fiber Optic. One of the radio links is going to get dropped and the other radio link will be turned into fiber sometime next year. The fiber is 20 Mbit, radio 1 is 40 Mbit and radio 2 is 2 Mbit. I've got a /24 of provider independent address space. I'm not doing out-of-the ordinary stuff with my network, I'm overly connected because my network needs to be "up" all the time.

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• Password-less login into localhost

  - by Brad

  I am trying to setup password-less login into my localhost because it's required for a tutorial. I went through the normal steps of generating an rsa key and appending the public key to authorized_keys but I am still prompted for a password. I've also enabled RSAAuthentication and PubKeyAuthentication in /etc/ssh_config. Following other suggestions I've seen, I tried: chmod go-w ~/ chmod 700 ~/.ssh chmod 600 ~/.ssh/authorized_keys But the problem persists. Here is the output from ssh -v localhost: (tutorial)bnels21-2:tutorial bnels21$ ssh -v localhost OpenSSH_5.9p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /etc/ssh_config debug1: /etc/ssh_config line 20: Applying options for * debug1: Connecting to localhost [::1] port 22. debug1: Connection established. debug1: identity file /Users/bnels21/.ssh/id_rsa type 1 debug1: identity file /Users/bnels21/.ssh/id_rsa-cert type -1 debug1: identity file /Users/bnels21/.ssh/id_dsa type -1 debug1: identity file /Users/bnels21/.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_5.9 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 1c:31:0e:56:93:45:dc:f0:77:6c:bd:90:27:3b:c6:43 debug1: Host 'localhost' is known and matches the RSA host key. debug1: Found key in /Users/bnels21/.ssh/known_hosts:11 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,keyboard-interactive debug1: Next authentication method: publickey debug1: Offering RSA public key: /Users/bnels21/.ssh/id_rsa debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Offering RSA public key: id_rsa3 debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Trying private key: /Users/bnels21/.ssh/id_dsa debug1: Next authentication method: keyboard-interactive Password: Any suggestions? I'm running OSX 10.8.

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• Issue with InnoDB engine while enabling and [ skip-innodb ]

  - by Ahn

  How to enable InnoDB, which was previously disabled with skip-innodb option. Case 1: Disabled the innodb with skip-innodb option and show engines givens as below. Engine | Support ... | InnoDB | NO ...... Case 2: As I want to enable the innodb, I commanded the #skip-innodb option and restarted. But now the show engines even not showing the InnoDB engine in the list. ? Mysql Version : 5.1.57-community-log OS : CentOS release 5.7 (Final) Log: 120622 13:06:36 InnoDB: Initializing buffer pool, size = 8.0M 120622 13:06:36 InnoDB: Completed initialization of buffer pool InnoDB: No valid checkpoint found. InnoDB: If this error appears when you are creating an InnoDB database, InnoDB: the problem may be that during an earlier attempt you managed InnoDB: to create the InnoDB data files, but log file creation failed. InnoDB: If that is the case, please refer to InnoDB: http://dev.mysql.com/doc/refman/5.1/en/error-creating-innodb.html 120622 13:06:36 [ERROR] Plugin 'InnoDB' init function returned error. 120622 13:06:36 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 120622 13:06:36 [Note] Event Scheduler: Loaded 0 events 120622 13:06:36 [Note] /usr/sbin/mysqld: ready for connections. Version: '5.1.57-community-log' socket: '/data/mysqlsnd/mysql.sock1' port: 3307 MySQL Community Server (GPL)

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• NFS: Server says "authenticated mount request", but client sees "access denied"

  - by zigdon

  I have two machine, an NFS server (RHEL) and a client (Debian). The server has NFS set up, exporting a particular directory: server:~$ sudo /usr/sbin/rpcinfo -p localhost program vers proto port 100000 2 tcp 111 portmapper 100000 2 udp 111 portmapper 100024 1 udp 910 status 100024 1 tcp 913 status 100021 1 udp 53391 nlockmgr 100021 3 udp 53391 nlockmgr 100021 4 udp 53391 nlockmgr 100021 1 tcp 32774 nlockmgr 100021 3 tcp 32774 nlockmgr 100021 4 tcp 32774 nlockmgr 100007 2 udp 830 ypbind 100007 1 udp 830 ypbind 100007 2 tcp 833 ypbind 100007 1 tcp 833 ypbind 100011 1 udp 999 rquotad 100011 2 udp 999 rquotad 100011 1 tcp 1002 rquotad 100011 2 tcp 1002 rquotad 100003 2 udp 2049 nfs 100003 3 udp 2049 nfs 100003 4 udp 2049 nfs 100003 2 tcp 2049 nfs 100003 3 tcp 2049 nfs 100003 4 tcp 2049 nfs 100005 1 udp 1013 mountd 100005 1 tcp 1016 mountd 100005 2 udp 1013 mountd 100005 2 tcp 1016 mountd 100005 3 udp 1013 mountd 100005 3 tcp 1016 mountd server$ cat /etc/exports /dir *.my.domain.com(ro) client$ grep dir /etc/fstab server.my.domain.com:/dir /dir nfs tcp,soft,bg,noauto,ro 0 0 All seems well, but when I try to mount, I see the following: client$ sudo mount /dir mount.nfs: access denied by server while mounting server.my.domain.com:/dir And on the server I see: server$ tail /var/log/messages Mar 15 13:46:23 server mountd[413]: authenticated mount request from client.my.domain.com:723 for /dir (/dir) What am I missing here? How should I be debugging this?

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• How do you avoid that server documentation gets out of sync with the actual setup?

  - by Frerich Raabe

  I'm a hobbyist maintaining a small FreeBSD server serving mail via IMAP - it's an exercise in server administration. The setup does have reasonably good documentation (in AsciiDoc format) which recently allowed another person to recreate the entire setup from scratch in less than 30 minutes. However, I noticed that after the initial setup, it easily happens that small changes done to the system (say: inetd gets disabbled, my IMAP server listens on an additional port for ManageSieve connections, a new router is added to the exim configuration) don't end up in the documentation immediately (if at all). My idea was to avoid this problem by (partially?) generating the documentation out of the configuration files and the comments therein - one way to implement this may be to put /etc and /usr/local/etc into some source code management system (say - git) and then run a script which regenerates the documentation on every commit. However, I'm not sure whether that would be overkill and/or too difficult to get right (after all, I don't want complete copies of the source files in my documentation but rather just the diffs). How do other people avoid that the server documentation gets outdated - is there a good way to keep them in sync automatically, or do you just have the discipline to update the documentation the same time you modify the system?

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• Setting Remote Desktop to allows IPv6 connections

  - by Garrett

  Setup: Basically I have 3 machines (2 virtual and 1 physical) that I would like to be able to RDP in to from outside my NAT (a router). The VMs are Windows 7 and Windows XP, both fully patched with Teredo installed and working, both running in VirtualBox (their host also has Teredo working, though I'm not sure if that matters). They both have bridged network adapters with promiscuous mode enabled. The physical machine is Windows 7 fully patched with an HFS server running on it and a dynamic DNS set up for my public IPv4 address and port forwarded. It also has Teredo installed and working. Symptoms: According to http://test-ipv6.com/ all 3 have public IPv6 addresses, and they can all connect to http://ipv6.google.com/. I can ping the XP VM from the host it's running on but I cannot ping it from any other machine. Also, I cannot ping either of the other machines from anywhere. I cannot connect to any of them over RDP from IPv6, however I can connect to all of them through IPv4. Any ideas what is going wrong?

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• How to configure network on Windows Server 2008

  - by Gokhan Ozturk

  I have a IBM x3400 Server Machine with Windows Server 2008 R2 installed on it. But, since I am not expert on networking I have some problems. These roles installed on my server: Active Directory DNS File Sharing Hyper-V ISS VPN There is two network card on them. I configured them like this: Local Connection 1: 192.168.30.3 255.255.255.0 192.168.30.2 127.0.0.1 Local Connection 2: 192.168.30.101 255.255.255.0 192.168.30.6 127.0.0.1 My problem is, when I use this Ip gateways, It is sharing internet to all computers. This is not I want. I want to use Local Connection 1 for internal network. I am giving all computers gateway and DNS IP as 192.168.30.3 The Local Connection 2 is for Hyper-V and VPN connections. 192.168.30.2 and 192.168.30.6 are my modem's gateways. I am using 192.168.30.6 external IP for VPN connections. There is two 24 port switches. There is a connection between them and this two ethernet card connected directly to them. And modems are connected to switches as well (Morems are not near the server. They are somewhere in the building). I disabled network Bridge and removed all ethernet cards from it. With this configuration, all computers can ping my server's IP (192.168.30.3) but on server I cannot ping any clients (Request timeout). What is the best way to configure my network? Thank you. Redgards

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• Last (I think and hope) problems configuring SSL certificate with Apache and VirtualHosts

  - by user65567

  Finally I set apache2 to get a single certificate for all subdomains. [...] # Go ahead and accept connections for these vhosts # from non-SNI clients SSLStrictSNIVHostCheck off # Apache setup which will listen for and accept SSL connections on port 443. Listen 443 # Listen for virtual host requests on all IP addresses NameVirtualHost *:443 # Because this virtual host is defined first, it will # be used as the default if the hostname is not received # in the SSL handshake, e.g. if the browser doesn't support # SNI. <VirtualHost *:443> ServerName domain.localhost DocumentRoot "/Users/<my_user_name>/Sites/domain/public" <Directory "/Users/<my_user_name>/Sites/domain/public"> Order allow,deny Allow from all </Directory> # SSL Configuration SSLEngine on ... </VirtualHost> <VirtualHost *:443> ServerName subdomain1.domain.localhost DocumentRoot "/Users/<my_user_name>/Sites/subdomain1/public" <Directory "/Users/<my_user_name>/Sites/subdomain1/public"> Order allow,deny Allow from all </Directory> # SSL Configuration SSLEngine on ... </VirtualHost> <VirtualHost *:443> ServerName subdomain2.domain.localhost DocumentRoot "/Users/<my_user_name>/Sites/subdomain2/public" <Directory "/Users/<my_user_name>/Sites/subdomain2/public"> Order allow,deny Allow from all </Directory> # SSL Configuration SSLEngine on ... </VirtualHost> So, for example, I can correctly access https://subdomain1.domain.localhost https://subdomain2.domain.localhost ... Now, anyway, I have problems on accessing http://subdomain1.domain.localhost http://subdomain2.domain.localhost ... Since I use a Mac Os, on accessing the "http: version", I get a default page "Your website." (instead of a error). Why does it happen?

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• TCP Keepalive and firewall killing idle sessions

  - by Carlos A. Ibarra

  In a customer site, the network team added a firewall between the client and the server. This is causing idle connections to get disconnected after about 40 minutes of idle time. The network people say that the firewall doesn't have any idle connection timeout, but the fact is that the idle connections get broken. In order to get around this, we first configured the server (a Linux machine) with TCP keepalives turned on with tcp_keepalive_time=300, tcp_keepalive_intvl=300, and tcp_keepalive_probes=30000. This works, and the connections stay viable for days or more. However, we would also like the server to detect dead clients and kill the connection, so we changed the settings to time=300,intvl=180,probes=10, thinking that if the client was indeed alive, the server would probe every 300s (5 minutes) and the client would respond with an ACK and that would keep the firewall from seeing this as an idle connection and killing it. If the client was dead, after 10 probes, the server would abort the connection. To our surprise, the idle but alive connections get killed after about 40 minutes as before. Wireshark running on the client side shows no keepalives at all between the server and client, even when keepalives are enabled on the server. What could be happening here? If the keepalive settings on the server are time=300,intvl=180,probes=10, I would expect that if the client is alive but idle, the server would send keepalive probes every 300 seconds and leave the connection alone, and if the client is dead, it would send one after 300 seconds, then 9 more probes every 180 seconds before killing the connection. Am I right? One possibility is that the firewall is somehow intercepting the keepalive probes from the server and failing to pass them on to the client, and the fact that it got a probe makes it think that the connection is active. Is this common behavior for a firewall? We don't know what kind of firewall is involved. The server is a Teradata node and the connection is from a Teradata client utility to the database server, port 1025 on the server side, but we have seen the same problem with an SSH connection so we think it affects all TCP connections.

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• XenServer 5.5 running WHS.. trying to add local or network printer/scanner/copier

  - by ProstheticHead

  Hi guys. Just wondering if anyone has prior experience in sharing a multifunction printer across a (mostly windows) network? My situation at the minute is complicated.. I DID have the printer attached directly to a Windows Home Server box and was able to scan to a share and print across the network from my other computers. Compatibility problems have forced me to virtualize WHS on XenServer 5.5... This is actually quite useful because I can now run other things on the same box, but the problem is that now WHS doesn't get direct hardware access so it doesn't see a USB attached PSC... Grrrr! So now I have a choice to make. I've read somewhere that I can buy an add in PCI USB controller and somehow set up a passthrough to one VM at a time. To me, this sound complicated but if it's likely to work reliably I'd prefer this method. I've read about another approach, which I'm not sure about either, but I guess sounds plausible. A Network USB server, (NOT a print server) that can somehow make a USB port accessible across a network. My worry here is that it likely needs some kind of 3rd party software to work.. so not ideal. If there are any other methods you can suggest I'd be happy to hear them... I need your help guys. I'm also in the market for a PCI express SATA controller, nothing flashy, just need up to 8 ports, JBOD and 100% compatability.. Any suggestions? Regards Kevin

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• git : The remote end hung up unexpectedly - too many simultaneous users?

  - by Pritam Barhate

  I asked this first on StackOverflow and I was suggested that I should ask it here: We have a self hosted git server (Gitolite) on a VPS account (CPU:2.68GHz RAM:1824MB). This same VPS is also used to publish our underdevelopment web apps for client demos. (Very little traffic). so the main use of the server is as a Git Server Only. This git server is accessed by a team of 30-40 people for various projects. Our problem is that during the day when 6-7 people are trying to access the server (sometimes same repo) we get frequent error message: ssh: connect to host xxx.xxx.xx.xx port 22: Bad file number fatal: The remote end hung up unexpectedly After trying for 10-15 minutes it generally succeeds. During early mornings and late nights when there are only 1-2 people, git commands work with 100% success rate. Also I would like to note that if I access the other file hosted on the server through HTTP it works fine. I found a couple of questions on StackOverflow and on other sites regarding this. But most of the people point towards SSH key set up or conflicts between Msysgit and Cygns SSH. However I don't think this is the problem in our case as we get this behavior on Windows (using msysgit only) as well as Mac Machines. Also if it was SSH configuration issue then it shouldn't work at all. But in our case it works after 10-15 minutes. I think in our case it might be too many simultaneous connections to same server (or same repo) or something like that. Does there exists a setting or a conf file that needs to modified to solve this problem? Please help me solve this problem or point me in the right direction. Thanks in advance. Pritam.

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• Why is ssh agent forwarding not working?

  - by J. Pablo Fernández

  In my own computer, running MacOSX, I have this in ~/.ssh/config Host * ForwardAgent yes Host b1 ForwardAgent yes b1 is a virtual machine running Ubuntu 12.04. I ssh to it like this: ssh pupeno@b1 and I get logged in without being asked for a password because I already copied my public key. Due to forwarding, I should be able to ssh to pupeno@b1 from b1 and it should work, without asking me for a password, but it doesn't. It asks me for a password. What am I missing? This is the verbose output of the second ssh: pupeno@b1:~$ ssh -v pupeno@b1 OpenSSH_5.9p1 Debian-5ubuntu1, OpenSSL 1.0.1 14 Mar 2012 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug1: Connecting to b1 [127.0.1.1] port 22. debug1: Connection established. debug1: identity file /home/pupeno/.ssh/id_rsa type -1 debug1: identity file /home/pupeno/.ssh/id_rsa-cert type -1 debug1: identity file /home/pupeno/.ssh/id_dsa type -1 debug1: identity file /home/pupeno/.ssh/id_dsa-cert type -1 debug1: identity file /home/pupeno/.ssh/id_ecdsa type -1 debug1: identity file /home/pupeno/.ssh/id_ecdsa-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1 debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1 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: sending SSH2_MSG_KEX_ECDH_INIT debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug1: Server host key: ECDSA 35:c0:7f:24:43:06:df:a0:bc:a7:34:4b:da:ff:66:eb debug1: Host 'b1' is known and matches the ECDSA host key. debug1: Found key in /home/pupeno/.ssh/known_hosts:1 debug1: ssh_ecdsa_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,password debug1: Next authentication method: publickey debug1: Trying private key: /home/pupeno/.ssh/id_rsa debug1: Trying private key: /home/pupeno/.ssh/id_dsa debug1: Trying private key: /home/pupeno/.ssh/id_ecdsa debug1: Next authentication method: password pupeno@b1's password:

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• Only tunnel certain applications via OpenVPN

  - by jinjin

  Hi, I've purchased a VPN solution, it works correctly when I have "redirect-gateway def1" in the configuration file (routing all traffic through the VPN). However when I remove that line from the configuration file, I am still able to ping-out of the machine (ping -I tap0), however I cannot ping the IP assigned to the machine (it's a public ip), i get the error: Destination Host Unreachable. I only want to have certain applications sending traffic through the VPN tunnel (eg: ZNC, irssi), all of which i can select which IP they use. However they can't recieve any data, making the tunnel essentially useless to me when disabling redirect-gateway. Any ideas on how to allow specific applications use the tunnel, without of forcing everything to go through it? My configuration file is as follows: dev tap remote #.#.#.# float #.#.#.# port 5129 comp-lzo ifconfig #.#.#.# 255.255.255.128 route-gateway #.#.#.# #redirect-gateway def1 secret key.txt cipher AES-128-CBC The output of ifconfig -a when the tunnel is connected: tap0 Link encap:Ethernet HWaddr 00:ff:47:d3:6d:f3 inet addr:#.#.#.# Bcast:#.#.#.# Mask:255.255.255.255 inet6 addr: <snip> Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:612 errors:0 dropped:0 overruns:0 frame:0 TX packets:35 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:25704 (25.1 KiB) TX bytes:6427 (6.2 KiB) EDIT: the Bcast:#.#.#.# (ifconfig) is different from route-gateway #.#.#.# (openvpn) if that makes any difference.

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• Does anyone know how to "tcpdump" traffic decrypted by Mallory MITM? [migrated]

  - by chriv

  I'm looking for some help in capturing network traffic that I can analyze in Wireshare (or other tools). The tool I'm using is mallory. If anyone is familiar with mallory, I could use some help. I've got it configured and running correctly, but I don't know how to get the output that I want. The setup is on my private network. I have a VM (running Ubuntu 12.04 - precise) with two NICs: eth0 is on my "real" network eth1 is only on my "fake" network, and is using dnsmasq (for DNS and DHCP for other devices on the "fake" network) Effectively eth0 is the "WAN" on my VM, and eth1 is the "LAN" on my VM. I've setup mallory and iptables to intercept, decrypt, encrypt and rewrite all traffic coming in on destination port 443 on eth1. On the device I want intercepted, I have imported the ca.cer that mallory generated as a trusted root certificate. I need to analyze some strange behavior in the HTTPS stream between the client and server, so that's why mallory is setup in between for this MITM. I would like to take the decrypted HTTPS traffic and dump it to either a logfile or a socket in a format compatible with tcpdump/wireshark (so I can collect it later and analyze it). Running tcpdump on eth1 is too soon (it's encrypted), and running tcpdump on eth2 is too late (it's been re-encrypted). Is there a way to make mallory "tcpdump" the decrypted traffic (in both directions)?

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• "Ethernet" doesn't have a valid IP configuration

  - by Xuzuno

  I'm using an ethernet cord to connect to my internet and it has been working well until Thursday morning when I turned on my laptop (Windows 8) to see a yellow triangle sign in the bottom right hand corner, in front of the ethernet connected symbol. Since then I haven't been able been able to access the internet from my computer. When I hover over it, it says that it is an "Unidentified network" and there is "No internet access". I've run the Windows 8 troubleshooting and it says that the problem found was ""Ethernet" doesn't have a valid IP configuration", but I'm unsure how to fix it. I'm thinking that the problem is to do with my computer rather than my network, because I've tried another laptop (Windows 7) through the same ethernet cable and connection and the internet works fine on the other laptop. I've tried so many fixes that I've found online, with none of them actually working. Yesterday I even tried a full system reset, where I re-installed Windows 8, re-partitioned and wiped everything off the hard drive, but it still appears have the exact same problem. Today I also purchased and tried a new ethernet cable which didn't work, so I then purchased a USB to Ethernet adapter, to make sure that it wasn't my ethernet port on my laptop that was faulty. That didn't work either, and the same problem still remains. I feel like I've tried everything, so can someone please help me?

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• Connection timed out on Node.js app running under CentOS

  - by ss1271

  I followed this tutorial to create a simple node.js app on my CentOS: the node.js version is: $ node -v v0.10.28 Here's my app.js: // Include http module, var http = require("http"), // And url module, which is very helpful in parsing request parameters. url = require("url"); // show message at console console.log('Node.js app is running.'); // Create the server. http.createServer(function (request, response) { request.resume(); // Attach listener on end event. request.on("end", function () { // Parse the request for arguments and store them in _get variable. // This function parses the url from request and returns object representation. var _get = url.parse(request.url, true).query; // Write headers to the response. response.writeHead(200, { 'Content-Type': 'text/plain' }); // Send data and end response. response.end('Here is your data: ' + _get['data']); }); // Listen on the 8080 port. }).listen(8080); However, when I uploaded this app onto my remote server (assume the address is 123.456.78.9), I couldn't get access to it on my browser http://123.456.78.9:8080/?data=123 The browser returned Error code: ERR_CONNECTION_TIMED_OUT. I tried the same app.js code which runs fine on my local machine, is there anything I am missing? I tried to ping the server and its address was reachable. Thanks.

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• Hadoop streaming job on EC2 stays in "pending" state

  - by liamf

  Trying to experiment with Hadoop and Streaming using cloudera distribution CDH3 on Ubuntu. Have valid data in hdfs:// ready for processing. Wrote little streaming mapper in python. When I launch a mapper only job using: hadoop jar /usr/lib/hadoop/contrib/streaming/hadoop-streaming*.jar -file /usr/src/mystuff/mapper.py -mapper /usr/src/mystuff/mapper.py -input /incoming/STBFlow/* -output testOP hadoop duly decides it will use 66 mappers on the cluster to process the data. The testOP directory is created on HDFS. A job_conf.xml file is created. But the job tracker UI at port 50030 never shows the job moving out of "pending" state and nothing else happens. CPU usage stays at zero. (the job is created though) If I give it a single file (instead of the entire directory) as input, same result (except Hadoop decides it needs 2 mappers instead of 66). I also tried using the "dumbo" Python utility and launching jobs using that: same result: permanently pending. So I am missing something basic: could someone help me out with what I should look for? The cluster is on Amazon EC2. Firewall issues maybe: ports are enabled explicitly, case by case, in the cluster security group.

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• Router vs switch in a LAN [closed]

  - by servernewbie

  If I have a LAN and and connect it with a switch, I understand it uses a CAM table to route packets in layer 2 (by saving mac to port relations). So far all good. However, when using a router for a LAN (ONLY for a LAN, not to connect it to "the outside" WAN/internet/etc) I get a bit confused as to how it internally processes packets. I would first split this into two router scenarios: Router with buit-in switch In this scenario, I would expect that it will act exactly as a switch with a CAM table internally. This would probably benefit a bit in speed (guessing here?) compared to the next option. Router without built-in switch Here is where I get confused. If hostA wants to send a packet to hostB, it will ARP to find hostB's MAC address and send it there. Now, if we had a switch (above scenario) this would be easy. But how does it work now in a router WITHOUT a switch? If I would guess, hostA would send an Ethernet frame with hostB's MAC address to the line. The router would fetch the packet (even though the router has another MAC address, it would still fetch this packet even if it only contains hostB's MAC address). It would strip the Ethernet frame header and check the IP, and then check its own internal ARP table again for the MAC address. Now, this would seem like a waste of resources compared to a router with a built-in switch. But maybe it does not work like that at all. Does it also contain a CAM table? If that would be true, what would then the difference between these two routers really be?

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• Set up Linux box as WAP for MyBookLive?

  - by AcidFlask

  I inherited an old Linux box as well as a MyBookLive and would like to make the MyBookLive available over my wireless, essentially using the Linux box as a wireless access point. I just wiped the Linux box (home) and installed Ubuntu 12.04 on it. My network setup currently looks like this: (192.168.0.1 netmask 255.255.255.0) ISP --- wireless router --- wlan0 on home (192.168.0.12) | eth0 on home --- MyBookLive MacBook (192.168.0.11) so that the MyBookLive is basically a glorified external hard drive. The router does have an Ethernet port, but it is being used by my roommate's computer so I can't plug the MyBookLive directly into it. Right now I can ping MyBookLive.local and MacBook.local from home, but I am having trouble understanding and figuring out what the correct iptables commands are to make my MacBook see my MyBookLive through the Bonjour network. Also, I'm not sure if I need to set up DNS to forward xxx.local Bonjour/Zeroconf addresses. I tried the following to forward my entire wired network (which has only my MyBookLive) to a single IP address: sysctl net.ipv4.ip_forward=1 iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT iptables -A FORWARD -i eth0 -o wlan0 -j ACCEPT iptables -t nat -A PREROUTING -i eth0 -p tcp -j DNAT --to 192.168.0.66 iptables -t nat -A PREROUTING -i eth0 -p udp -j DNAT --to 192.168.0.66 but I can't ping this address from my MacBook. This is probably horribly wrong, but I am a complete noob at setting up this kind of network and could use some expert help with setting this up properly.

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