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• iptables configuration under ubuntu

  - by aioobe

  I'm following a tutorial on setting up a dns-tunnel. I've run into the following instruction: Now you need to enable forwarding on this server. I use iptables to implement masquerading. There are many HOWTOs about this (a simple one, for example). On Debian, the configuration file for iptables is in /var/lib/iptables/active. The relevant bit is: *nat :PREROUTING ACCEPT [6:1596] :POSTROUTING ACCEPT [1:76] :OUTPUT ACCEPT [1:76] -A POSTROUTING -s 10.0.0.0/8 -j MASQUERADE COMMIT Restart iptables: /etc/init.d/iptables restart The problem is that I don't have any /var/lib/iptables/active. (I'm on ubuntu.) How can I accomplish this? I suspect that I should just interact with the iptables command somehow but I have no clue what to write. Best would probably be if I could put the commands in a script somehow I suppose. (A side-note. If I execute a few iptables-commands it wont be there for ever, right? The rules will be discarded on reboot?)

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• How do I change the Dropbox directory on a headless GNU/Linux server?

  - by DrTwox

  I have installed Dropbox 2.0.0 via command line on my home server (Ubuntu Server 12.04) to use for off-site automated backups, but I can't change the directory that the Dropbox daemon keeps synced. I've tried the following: The official docs say to use the desktop application, which is not applicable in my situation. However I installed the desktop app on my desktop machine and changed the default folder location, but I can't find where this change is stored in the ~/.dropbox/ directory so I can make the same change on the server. This page (and several others) recommends a Python script to do the job. Looking at the script, it opens a SQLite database called ~/.dropbox/dropbox.db, which does not exist on my Dropbox install, leading me to believe the script is out-of-date. This forum thread suggests manually inserting the required row in the config.db database, which I did, but it made no difference. I checked the same database file on my desktop machine, and it does not have the dropbox_path key, so I'm presuming the information in that thread is also out of date for version 2.0. I have tried to launch the Dropbox GUI configuration wizard over SSH with X11 forwarding, as suggested in one of the answers, but the binary must detect the absence of a local X11 install and it starts a command line daemon instead, which provides no means to change the option I need. I am currently using a symlink, as suggested as an answer, but this is a kludge. I would like to know the correct way to make the change. How do I change the Dropbox directory on a headless GNU/Linux server? Update: I've ditched Dropbox and started using Copy. Their Linux tools and support is far superior to Dropbox. I leave this question here in case someone, someday, can answer it.

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• How to place a virtual machine in DMZ?

  - by Giordano

  I have an Ubuntu 12.04 server running few virtual machines with KVM. I would like to expose some of these virtual machines on the internet, to make it possible for customers to test the products we're developing and make available other products for demo purposes. One of the server NICs is configured with a public IP. However before exposing anything on the web I would like to be sure that if one of the virtual machines get compromised, the attacker doesn't reach the rest of the hosts. What I would like to do is to put these virtual machines into a DMZ. These are the steps I'm planning to do: Create a tap interface in the virtualization host (let's say tap1) Create a bridge using tap1 and give it an IP in a subnet separate from the other hosts. Let's say 10.0.0.1 Attach the DMZ virtual machines to the bridge and configure their IP statically (10.0.0.2, 10.0.0.3, etc...) Using UFW, forbid any traffic from 10.0.0.0/24 to any of the internal hosts, allow the traffic from the internal hosts towards 10.0.0.0/24 and expose the virtual machines on the web using port forwarding. Do you think this setup is safe? Can you suggest any improvement or a better/safer approach? Thanks in advance!

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• Linux VLAN Bridge

  - by raspi

  I have home network with VLANs, one for LAN, one for WLAN and one for internet. I'd like to use bridging so that instead of configuring these same VLANs to every machine, they had own VLAN ID and bridges were LAN, WLAN and internet. I've tried it but for some reason keep-alive/ttl seems to get broken because SSH sessions etc suddenly disconnects. We have this same setup working in workplace for 4+ years with 100+ customers but it's custom firewall/router hardware so accessing it is impossible. I know that it runs Linux. So what is Debian/Ubuntu default network settings doing wrong or is it just NIC driver/hw problem? I've tried to mess araund with ttl etc settings without any luck. The bad stuff is happening in the bridge because current VLAN-only setup works fine. interfaces: auto lo iface lo inet loopback # The primary network interface allow-hotplug eth0 allow-hotplug eth1 iface eth0 inet static iface eth1 inet static auto vlan111 auto vlan222 auto vlan333 auto vlan444 auto br0 auto br1 auto br2 # LAN iface vlan111 inet static vlan_raw_device eth0 # WLAN iface vlan222 inet static vlan_raw_device eth0 # ADSL Modem iface vlan333 inet static vlan_raw_device eth1 # Internet iface vlan444 inet static vlan_raw_device eth0 # LAN bridge iface br0 inet static address 192.168.0.1 netmask 255.255.255.0 bridge_ports eth0.111 bridge_stp on # Internet bridge iface br1 inet static address x.x.x.x netmask x.x.x.x gateway x.x.x.x bridge_ports eth1.333 eth0.444 bridge_stp on post-up iptables -t nat -A POSTROUTING -o br1 -j MASQUERADE pre-down iptables -t nat -D POSTROUTING -o br1 -j MASQUERADE # WLAN bridge iface br2 inet static address 192.168.1.1 netmask 255.255.255.0 bridge_ports eth0.222 bridge_stp on Sysctl: net.ipv4.conf.default.forwarding=1

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• Linux/hostapd: AP can ping clients, clients can access internet, can't access www@wlan1 with more than 5-6 packets at once

  - by mhambra

  Please edit the title, can't make it sound better. -- OP. Hi all, I have a Wifi USB dongle in a PC, that serves as an AP for laptop. wlan1: 192.168.2.1, netmask 255.255.255.0, routed: route add -net 192.168.2.0 netmask 255.255.255.0 gw 192.168.2.1 ping 192.168.2.2 (laptop): ping was ok for lot of packets. Now, I try to access 192.168.2.1:80/myindex.html (apache) from laptop, and can see that own 1kb test page. But, trying to access 192.168.2.1:80/my.jpg, I see the following: GET /my.jpg HTTP/1.1 200 OK <jpg header, about a kilobyte> <TCP packet retransmisson> <TCP packet retransmisson> <end of stream> It seems to be a hostapd's problem (networked stuff worked fine with Ad-Hoc), but it may be also forwarding/routing problem too. What to google for? Even more strange, SSH to that host works fine.

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• VPN sharing on Mac OS X 10.5 machine

  - by Jens

  I have a rather weird problem. I want to share a VPN connection that has been established by my Mac OS X 10.5 computer with another machine in my network. This is what I did: In the /etc/hostcongig file on the main computer I added the line: IPFORWARDING=-YES- I assigned a fixed IP address to my computer (192.168.178.30), a fixed one to the other machine (192.168.178.60) and my computer's IP address as gateway on the other machine. I connected to my VPN using the internal Mac OS X VPN client (PPTP connection) I run this script: #!/bin/sh natd -same_ports -use_sockets -unregistered_only -dynamic -interface ppp0 -clamp_mss ipfw -f flush ipfw add divert natd ip from any to any via ppp0 ipfw add pass all from any to any sysctl -w net.inet.ip.forwarding=1 Source: Using (and sharing) a VPN connection on your Mac Now everthing works smootly, however speed is an issue. I get 1,8 MBit/s on my main machine and only 0,3 - 0,6 MBit/s on the other one. My question: What could possibly be wrong? Do I have to tweak MTU settings, is there any packet inspection ongoing that needs time....? Any help appreciated!

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• Remotely viewing IP camera on Belkin N450 DB router

  - by Mike Miller

  I need to setup a wireless IP camera (Trendnet TV-IP501W) on my network so that it is remotely visible from anywhere. Right now I successfully connected it to my home network but nothing else. My router is a Belkin N450 DB. Any help would be much appreciated, including what this would be referred to as so I could more easily ask another forum. I believe it is something like "port forwarding" but I'm not sure. Ok, I believe I found this in the "virtual servers" section. It asks for enabling with a check box, description, inbound port, type, private IP, & private port. In that order I have checked enabling, "camera", 150, TCP, 81, and 81? I'm assuming inbound ports are the numbers I use for the home network - xxx.xxx.x.150 and the 81 was for private. I used my WAN IP and added :81 and .81 but didn't get it. What am I doing wrong? Ok, I believe I found this in the "virtual servers" section. It asks for enabling with a check box, description, inbound port, type, private IP, & private port. In that order I have checked enabling, "camera", 150, TCP, 81, and 81? I'm assuming inbound ports are the numbers I use for the home network - xxx.xxx.x.150 and the 81 was for private. I used my WAN IP and added :81 and .81 but didn't get it. What am I doing wrong?

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• How to set up simple VPN for secure Internet connections over unencrypted Wi-Fi on Windows?

  - by Senseful

  I'm looking for a solution similar to the one in this question, except that I don't have a linux computer. I have windows computers that could be set up to accept VPN connections. Preferably I want to set this up on either Windows Server 2003 or Windows XP. I'd like to connect different devices (e.g. iPhone, iPad, laptops, etc.) that are on open unsecure wireless networks (e.g. the one's you see at places like Starbucks) to this VPN to ensure that all my data is secure. I found an article that shows that you can enable VPN connections on Windows XP. After following those steps, though, I'm not sure what to do. Which ports do I open on my firewall? Which VPN settings do I use on my devices such as the iPhone? Do I use L2TP, PPTP, or IPSec? What's the difference between these? Are there any other steps missing in that tutorial? I'm hoping that since Windows has this built in feature, that it will be much simpler to set up rather than having to deal with setting up something such as OpenVPN. If I follow those settings and enable port forwarding on port 1723, and then use the following settings on the iPhone: PPTP (IP Address) RSA SecurID: Off Encryption Level: Auto Send All Traffic: On Proxy: Off It shows "Connecting..." then "Disconnecting..." and the following error message: VPN Configuration A connection could not be established to the PPP server. Try reconnecting. If the problem continues, verify your settings and contact your Administrator. I'm using a user account that I enabled privileges to in the VPN settings on the Windows machine.

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• Default IPv6 route on debian squeeze does not come up after boot

  - by Georg Bretschneider

  I have a problem with my default IPv6 route not coming up after boot on a Debian Squeeze system. This is my config (/etc/network/interfaces): # Loopback device: auto lo iface lo inet loopback iface lo inet6 loopback # device: br0 auto br0 iface br0 inet static bridge_ports eth0 bridge_fd 0 address 88.198.62.xx broadcast 88.198.62.63 netmask 255.255.255.224 gateway 88.198.62.33 up route add -net 88.198.62.32 netmask 255.255.255.224 gw 88.198.62.33 br0 iface br0 inet6 static address 2a01:4f8:131:10x::2 netmask 64 gateway 2a01:4f8:131:100::1 up route -A inet6 add 2a01:4f8:131:100::1/59 dev br0 My inet comes up alright, but I have to exec the route command manually after boot to make IPv6 work. Otherwise I can't even reach my gateway. This is the output of ip -6 route show after boot: 2a01:4f8:131:10x::/64 dev br0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 unreachable fe80::/64 dev lo proto kernel metric 256 error -101 mtu 16436 advmss 16376 hoplimit 4294967295 fe80::/64 dev br0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 I already tried it with: up ip -6 route add 2a01:4f8:131:100::1 dev br0 up ip -6 route add default via 2a01:4f8:131:100::1 dev br0 in /etc/network/interfaces, but with the same results. If I execute those commands manually on my shell, everything starts working nicely. And yes, I tried with post-up instead of up, too. Only other changes I made was to activate ip forwarding for IPv6, because I want to run some LXC containers on that system.

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• Packets being dropped by iptables

  - by Shadyabhi

  I am trying to create a Software Access Point in linux. I followed the blog here. Steps I performed: Started dhcp server on wlan0. Properly configured hostapd.conf Enabled packet forwarding & masquerading. Two commands executed regarding iptables: iptables --table nat --append POSTROUTING --out-interface eth0 -j MASQUERADE iptables --append FORWARD --in-interface wlan0 -j ACCEPT I enabled logging on iptables & I get this in everything.log Jun 29 19:42:03 MBP-archlinux kernel: [10480.180356] IN=eth0 OUT=wlan0 MAC=c8:bc:c8:9b:c4:3c:00:13:80:40:cd:80:08:00 SRC=195.143.92.150 DST=10.0.0.3 LEN=44 TOS=0x00 PREC=0x00 TTL=52 ID=38025 PROTO=TCP SPT=80 DPT=53570 WINDOW=46185 RES=0x00 ACK URGP=0 Jun 29 19:42:03 MBP-archlinux kernel: [10480.389102] IN=eth0 OUT=wlan0 MAC=c8:bc:c8:9b:c4:3c:00:13:80:40:cd:80:08:00 SRC=195.143.92.150 DST=10.0.0.3 LEN=308 TOS=0x00 PREC=0x00 TTL=52 ID=14732 PROTO=TCP SPT=80 DPT=53570 WINDOW=46185 RES=0x00 ACK PSH URGP=0 Jun 29 19:42:03 MBP-archlinux kernel: [10480.389710] IN=eth0 OUT=wlan0 MAC=c8:bc:c8:9b:c4:3c:00:13:80:40:cd:80:08:00 SRC=195.143.92.150 DST=10.0.0.3 LEN=44 TOS=0x00 PREC=0x00 TTL=52 ID=14988 PROTO=TCP SPT=80 DPT=53570 WINDOW=46185 RES=0x00 ACK FIN URGP=0 Jun 29 19:42:03 MBP-archlinux kernel: [10480.621118] IN=eth0 OUT=wlan0 MAC=c8:bc:c8:9b:c4:3c:00:13:80:40:cd:80:08:00 SRC=195.143.92.150 DST=10.0.0.3 LEN=44 TOS=0x00 PREC=0x00 TTL=52 ID=63378 PROTO=TCP SPT=80 DPT=53570 WINDOW=46185 RES=0x00 ACK FIN URGP=0 I have almost no knowledge of iptables, all I did was through googling. So, can anyone help me in making me understand what wrong is happening here? I have tried running tcpdump on wlan0 & http packets are being sent from wlan0.

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• Issue with exim4u

  - by bretterer

  I am using exim4u for a mail server on debian. Everything has been working fine until recently. I have not done anything to the server from the time it was working until now. I have a domain set up and is receiving and sending mail correctly. When i put a forwarding address in to a gmail address, I can still receive and send email from my webmail client but it never makes it to gmail. I have check logs and this is what I have found 2012-04-01 18:47:04 1SEPns-0000aN-Br DKIM: d=gmail.com s=20120113 c=relaxed/relaxed a=rsa-sha256 [verification succeeded] 2012-04-01 18:47:10 1SEPns-0000aN-Br H=mail-bk0-f43.google.com [209.85.214.43] Warning: X-Spam_score: -0.3 2012-04-01 18:47:10 1SEPns-0000aN-Br <= [email protected] H=mail-bk0-f43.google.com [209.85.214.43] P=esmtps X=TLS1.0:RSA_ARCFOUR_MD5:16 S=3424 id=CAGZkSKbYc7SJR+yXTgG8ubQvx4PNb0CwHG1DDKGeZ-qFiA$ 2012-04-01 18:47:11 1SEPns-0000aN-Br => /home/mail/mydomain.com/support/Maildir ([email protected]) <[email protected]> R=virtual_domains T=virtual_delivery 2012-04-01 18:47:12 1SEPns-0000aN-Br => [email protected] <[email protected]> R=dnslookup T=remote_smtp H=gmail-smtp-in.l.google.com [209.85.225.27] X=TLS1.0:RSA_ARCFOUR_SHA1:16 2012-04-01 18:47:12 1SEPns-0000aN-Br Completed I am not a mail server person so im not sure what everything here is saying. It appears to me that it is successfully sending mail to gmail though. I have checked my spam folder as well and nothing there either. If it would help to have some more information from my server, let me know because Im not sure what would be of help here.

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• HTTP request hangs for for exactly 150 seconds, then gives incomplete response. How do I find out wh

  - by Nathan

  I am hosting a Wordpress blog, and having a strange problem. When I connect to the server (http://71.65.199.125/ at the time of this writing) it displays the Title correctly, and half of a download bar, indicating it has received some of the page, then it hangs for exactly 150 seconds (timed it twice), then it sends the rest of the page, but without the stylesheet. after that it hangs indefinitely, continuing to say "connecting..." without making any progress. If you have any clues as to what might be happening, or how I could print debug logs of PHP or something to see what it is looking for during that hang time that would probably help. recent changed I have made: switched wordpress themes, however I did see it work once with the new theme. moved the server to another building, with an identical ISP, and linksys router forwarding setup. I have also added a favicon.gif file to /var/www but without linking to it from any of the wordpress pages. I have also had a unanticipated power interruption. System info: Ubuntu debian 9.04 Apache2 PHP 5 Wordpress 2.9.2 Thank you

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• How can I get web pages from sub.a.com using url sub.b.com?

  - by Steven

  I have developed www.mysite.com. This site can be "integrated" into my partners website. What I do is to create partner1.mysite.com and repalce my header and footer with my partners header and footer and replace some CSS styling. This should make it as transaprent as possible for the user, so that they think they are still browsing my partners website. There are two ways I see how I can accomplish this: 1. My partner uses an IFrame to show the content from partner1.mysite.com 2. My partner creates sub domain and points it to my sub domain. Solution 1 is easy, but I'm not sure how search engines likes this, so I will try solution 2. QUESTION Can I use mysite.partner1.com but read content from partner1.mysite.com? I don't want to forward / redirect users to partner1.mysite.com. It's important that the URL is mysite.partner1.com / mysite.partner1.com/some/page. Is this possible? For testing, I have Apache configuration more or less like this: NameVirtualHost 10.0.0.17 <VirtualHost 10.0.0.17> DocumentRoot D:/wamp/www/mysite/ ServerName mysite.com </VirtualHost> <VirtualHost 10.0.0.17> DocumentRoot D:/wamp/www/mysite/ ServerName site1.mysite.com </VirtualHost> // Since this is on my localhost, I also configure site1 here <VirtualHost 10.0.0.17> DocumentRoot D:/wamp/www/site1/ ServerName site1.com </VirtualHost> <VirtualHost 10.0.0.17> ServerName mysite.site1.com --> DO SOME SORT OF FORWARDING HERE <-- </VirtualHost>

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• Setting up virtualbox for outside access

  - by Morgan Green

  I have a computer running a server that my subdomain on my shared hosting account points to. IE subdomain.mydomain.org goes to my home server. Now then; what I'm wanting to do is be able to access my VirtualBox servers through that subdomain and a different port. E.G Ubuntu Virtual Box Server 1 Username:Ubuntuhost1 Password:MyUbuntuHost1 Port:4000 Internal IP: 192.168.1.60 External IP: 24.29.138.45 Ubuntu Virtual Box Server 2 Username:UbuntuHost2 Password:MyUbuntuHost2 Port:4001 Internal IP: 192.168.1.61 External IP: 24.29.138.45 Now I want to be able to access RDP number 1 through Port 4000, but if I access Port 4001 it will connect to the server on port 4001; both using the same subdomain. The next issue is the fact that even though I know what the IP addresses are on the router for the virtualbox hosts through ifconfig it doesn't change the fact that they don't show up on the router. If anyone knows how to configure this to work please help me out because I've been racking my brain to the highest extent I can. Alright; here's an edit to clarify more; Sorry. My ports on the router are edited to forward Port 4000 on Internal IP 192.168.1.63 (My Ubuntu Internal IP address) Now when I go to my Router Home Page my VirtualBox Internal IP Address doesn't show on the attached device listings, so I set up port forwarding anyways to the VirtualBox Internal IP. My end goal is when I connect to mydomain.org and I connect through port 3389 it takes me to my host computers server, but if I put in mydomain.org and go through port 4000 it's going to redirect to my VirtualBox server; Is this even possible? Sorry; I'm trying to clarify the most I think I can I just don't know how else to explain my issue.

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• Can I use iptables on my Varnish server to forward HTTPS traffic to a specific server?

  - by Dylan Beattie

  We use Varnish as our front-end web cache and load balancer, so we have a Linux server in our development environment, running Varnish with some basic caching and load-balancing rules across a pair of Windows 2008 IIS web servers. We have a wildcard DNS rule that points *.development at this Varnish box, so we can browse http://www.mysite.com.development, http://www.othersite.com.development, etc. The problem is that since Varnish can't handle HTTPS traffic, we can't access https://www.mysite.com.development/ For dev/testing, we don't need any acceleration or load-balancing - all I need is to tell this box to act as a dumb proxy and forward any incoming requests on port 443 to a specific IIS server. I suspect iptables may offer a solution but it's been a long while since I wrote an iptables rule. Some initial hacking has got me as far as iptables -F iptables -A INPUT -p tcp -m tcp --sport 443 -j ACCEPT iptables -A OUTPUT -p tcp -m tcp --dport 443 -j ACCEPT iptables -t nat -A PREROUTING -p tcp --dport 443 -j DNAT --to 10.0.0.241:443 iptables -t nat -A POSTROUTING -p tcp -d 10.0.0.241 --dport 443 -j MASQUERADE iptables -A INPUT -j LOG --log-level 4 --log-prefix 'PreRouting ' iptables -A OUTPUT -j LOG --log-level 4 --log-prefix 'PostRouting ' iptables-save > /etc/iptables.rules (where 10.0.0.241 is the IIS box hosting the HTTPS website), but this doesn't appear to be working. To clarify - I realize there's security implications about HTTPS proxying/caching - all I'm looking for is completely transparent IP traffic forwarding. I don't need to decrypt, cache or inspect any of the packets; I just want anything on port 443 to flow through the Linux box to the IIS box behind it as though the Linux box wasn't even there. Any help gratefully received... EDIT: Included full iptables config script.

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• Need info on scripts and Autoforward through Exchange Server in Outlook 2010

  - by user103037

  I am using the below information to auto-forward my work emails to my BB via a gmail account. The script works fine. But my work email ask's for every email to send either classifield or unclassified. What and where would I add into the below script to autoforward unclassified? I have written some VBA script to do this bypass the server's disabling of auto-forward. Basically it mimics the user forwarding the email rather than the server doing an auto-forward. It's pretty simple: Sub AutoForwardAllSentItems(Item As Outlook.MailItem) Dim strMsg As String Dim myFwd As Outlook.MailItem Set myFwd = Item.Forward myFwd.Recipients.Add "[email protected]" myFwd.Send Set myFwd = Nothing End Sub It's beyond the scope of this post to give detailed instructions, but here's a summary: Add the above code in the Visual Basic editor of Outlook (Alt-F11 should get your started). Be sure to change [email protected] to the address where you want the mail to go Tell Outlook to run this code for each inbound message (Tools - Rules and Alerts - New Rule - Check Messages when they arrive - Next - YES - Checkbox "Run a Script" - Then select the script you just created. Now Outlook should automatically forward each email you receive, but it won't be blocked by the Admin as an "Auto-forward".

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• Login failed for user 'XXX' on the mirrored sql server

  - by hp17

  Hello, We have 4 web servers that host our asp.net (3.5) application. Randomly, we get error messages like : 1) "Login failed for user 'userid'" 2) "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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)" we are running sql2005 and have a principle and a mirror db (sync). When these exceptions are thrown, I look at the SQL error logs on the mirrored db and noticed the failed login messages in there. The principle db is running fine and the other web apps are working great. this will happen for maybe 10 min, then the app pool recycles and it starts hitting the principle db again. Is there a configuration I have incorrect? my theory is that our principle db is forwarding the request to the mirror, but that should never happen. any help??

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• Configuring IE to resolve DNS at the proxy rather than locally.

  - by dankilman

  With the intention of tunneling web traffic through an SSH connection, the following has been done: I've manually configured a PAC file in IE7 in the LAN Settings dialog. I've verified that traffic is routed through my SSH tunnel that is setup for SOCKS5 dynamic port forwarding. I see that IE7 is always trying to resolve the name locally first. What I'm looking for is the ability to have the DNS name resolved at the proxy, rather than locally by the browser. There's a setting in Firefox that specifies DNS remote resolution, and Safari does it automatically. I've verified correct operation for these 2 other browsers. It would be nice if I could get IE to work also. This is for reference so you could understand where does the question originate from. Notice: The question was actually found by the help of google but with no answers available. Considering how it is exactly my question I figured I should just copy/paste over here because I don't think I could describe any better (there is a small introduction though).

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• I need a reverse proxy solution for SSH

  - by Bond

  Hi here is a situation I have a server in a corporate data center for a project. I have an SSH access to this machine at port 22.There are some virtual machines running on this server and then at the back of every thing many other Operating systems are working. Now Since I am behind the data centers firewall my supervisor asked me if I can do some thing by which I can give many people on Internet access to these virtual machines directly. I know if I were allowed to get traffic on port other than 22 then I can do a port forwarding. But since I am not allowed this so what can be a solution in this case. The people who would like to connect might be complete idiots.Who may be happy just by opening putty at their machines or may be even filezilla.I have configured an Apache Reverse Proxy for redirecting the Internet traffic to the virtual machines on these hosts.But I am not clear as for SSH what can I do.So is there some thing equivalent to an Apache Reverse Proxy which can do similar work for SSH in this situation. I do not have firewall in my hands or any port other than 22 open and in fact even if I request they wont allow to open.2 times SSH is not some thing that my supervisor wants.

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• Virtual IPv6 Network between VirtualBox VMs

  - by Ben

  I'm trying to create a virtual IPv6 network as a test environment. I have 5 VirtualBox VMs (Ubuntu Server) with network adapters using host-only networking. You can imagine them being connected in series and every machine connects 2 subnets. I want to ping the last machine from the first one: On: 2001:db8:aaaa::100 I want to ping 2001:db8:dddd::101 (Note: there is no cccc network in between) Only static configuration and routes are used: /etc/network/interfaces auto eth0 iface eth0 inet6 static address 2001:db8:aaaa::100 netmask 64 /etc/network/interfaces auto eth0 iface eth0 inet6 static address 2001:db8:aaaa::101 netmask 64 auto eth1 iface eth1 inet6 static address 2001:db8:bbbb::100 netmask 64 up ip -6 route add 2001:db8:dddd::/64 via 2001:db8:bbbb::101 dev eth1 down ip -6 route del 2001:db8:dddd::/64 via 2001:db8:bbbb::101 dev eth1 I thought there might be some automatic route discovery going on. Anyway, ping6 2001:db8:dddd::100 will not work from aaaa::100 When I add the route: ip -6 route add 2001:db8:dddd::/64 via 2001:db8:aaaa::101 it will work. But the next interface in the same network dddd::101 is not reachable. How could that be? There is a machine with an interface bbbb::101 and another dddd::100 and I can ping the latter one, but the machine connected to it, dddd::101 not?? I also have also turned on forwarding. Any ideas?

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• trying to route between two openvpn clients

  - by user42055

  I have two openvpn clients on the 10.0.1.0 (client1) and 192.168.0.0 (client2) subnets with the server's openvpn connection having the ip 192.168.150.1 The server has ip forwarding enabled. Currently, client1's vpn ip is 192.168.150.10 and the P-t-P ip is 192.168.150.9 I have created the following static route on client1: route add -net 10.0.1.0 netmask 255.255.255.0 gw 192.168.150.9 The routing table on client1 looks like this: Destination Gateway Genmask Flags MSS Window irtt Iface 192.168.150.9 0.0.0.0 255.255.255.255 UH 0 0 0 tun0 192.168.150.1 192.168.150.9 255.255.255.255 UGH 0 0 0 tun0 10.0.1.0 192.168.150.9 255.255.255.0 UG 0 0 0 tun0 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo 0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0 I thought this would be correct to allow traffic from client1 to reach computers on client2's network, but it does not work. Is 192.168.150.9 (the P-t-P address) the correct one to be routing through ? I tried using 192.168.150.1 but I couldn't create the route. I hope this is clear.

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• How to create a static IP on Windows Server 2008 R2 so I can access the server remotely

  - by Aesir

  I have just purchased a HP Proliant N40L which I am intending to use as a NAS, learning tool and just in general something to mess around with. As a student via the Microsoft dreamspark program I can get a free copy of Windows Server 2008 R2 which I am using as the OS. So that I can remote to the box from outside of my local network and so that I can stream media from it to my PS3, I have read that I need to create a static IP for the server and use port forwarding to forward to this IP so I can remote in. Is this correct? I am not really sure how to do this and if I need to make these changes on my router configuration, on the OS or both. I am a novice when it comes to networking however most resources for Windows server 2008 R2 seem to assume a fair amount of experience already. I realise that using this particular OS may seem like overkill for what I currently wish to do with it (stream content to other devices and backup) but as I can get a copy for free it seems sensible. Edit: From reading answers posted I feel I should give more information. I have now tried to add a static IP address using my router configuration settings. I have used the getmac command to get the mac address of the server. My ISP is Virgin Media and I have gone to the LAN IP section and I have added an IP address to the DHCP Reservation Lease Info. I can now use remote desktop connection internally to remote to the server (so I am assuming assigning this IP has worked). How do I configure this on the OS as well? I am also unsure on how I would remote to this machine outside of my local network?

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• Postfix + Exchange + ActiveDirectory; How to mix them

  - by itwb

  My client has got many sub-offices, and one head office. The headoffice has a domain name: business.com All users in the many sub-offices need to have a headoffice email address: [email protected] Anyone not in the head office will need the email forwarded to an external email address. All users in the head office will have their email delivered to Microsoft Exchange. Users are listed in Active Directory under two different OU's: HeadOffice or SubOffice. Is this something able to be configured? I've done some googling, but I can't find any examples or businesses set up this way. Edit: Postfix will accept all email, will need to determine to forward the email to an external account or alternatively have it delivered to MS Exchange. I've done some reading about MS Exchange and that you can 'mail-enable' contacts for forwarding - but I don't know if each AD account requires an Exchange CAL? The end goal is to forward email to external accounts to sub offices or accept email for head office. Maybe I don't need to worry about Postfix to perform this task..... http://www.windowsitpro.com/article/exchange-server-2010/exchange-server-licensing-some-of-your-questions-answered "What about client access licenses (CALs)? You need one CAL per user who will connect to Exchange. Although it might not be 100 percent precise, I prefer to think of it as one CAL per mailbox; there are exceptions for users outside your organization, automated tools that use mailboxes, and so on. Exchange doesn't enforce this limit, so it's on you to ensure that you have the correct number of CALs for the set of clients you support."

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• use ssh tunnel with phpmyadmin

  - by JohnMerlino

  I been using ssh tunnel to bypass firewall of remote mysql server. On my Ubuntu 12.04 installation, it works via the terminal and it works when using a program called mysql workbench. However, that program freezes often and I want to try phpmyadmin as an alternative. However, I cannot connect to remote server using ssh tunnel on phpmyadmin, albeit I can connect locally. These are the steps I've tried: 1) Open a tunnel, listening on localhost:3307 and forwarding everything to xxx.xxx.xxx.xxx:3306 (used 3307 because MySQL on my local machine uses the default port 3306): ssh -L 3307:localhost:3306 [email protected] So now I have the port for tunnel open and I have my local mysql installation default port: $ netstat -tln Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:3307 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN ... 2) Now I can easily connect to remote server via localhost using the terminal: $ mysql -u user.name -p -h 127.0.0.1 -P 3307 Notice that I expicitly identify 3307 as the port, so traffic forwards to the remote server, and hence it logs me in to the remote server. Unfortunately, the localhost/phpmyadmin local login interface doesn't allow you to specify a port option. So I modify the config-db.php file and change the $dbport variable to 3307, under the impression that the phpmyadmin interface will now work with port 3307: $ sudo vim /etc/phpmyadmin/config-db.php $dbport='3307'; Then I restart the mysql server. Unfortunately, it didn't work. When I use the remote credentials to login, it gives me error: #1045 Cannot log in to the MySQL server

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• How can I setup OpenVPN with IPv4 and IPv6 using a tap device?

  - by Lekensteyn

  I've managed to setup OpenVPN for full IPv4 connectivity using tap0. Now I want to do the same for IPv6. Addresses and network setup (note that my real prefix is replaced by 2001:db8): 2001:db8::100:0:0/96 my assigned IPv6 range 2001:db8::100:abc:0/112 OpenVPN IPv6 range 2001:db8::100:abc:1 tap0 (on server) (set as gateway on client) 2001:db8::100:abc:2 tap0 (on client) 2001:db8::1:2:3:4 gateway for server Home laptop (tap0: 2001:db8::100:abc:2/112 gateway 2001:db8::100:abc:1/112) | | | (running Kubuntu 10.10; OpenVPN 2.1.0-3ubuntu1) | wifi | | router | | OpenVPN INTERNET | eth0 | /tap0 VPS (eth0:2001:db8::1:2:3:4/64 gateway 2001:db8::1) (tap0: 2001:db8::100:abc:1/112) (running Debian 6; OpenVPN 2.1.3-2) The server has both native IPv4 and IPv6 connectivity, the client has only IPv4. I can ping6 to and from my server over OpenVPN, but not to other machines (for example, ipv6.google.com). net.ipv6.conf.all.forwarding is set to 1, I've tried disabling net.ipv6.conf.all.accept_ra as well, without luck. Using tcpdump on both the server and client, I can see that packets are actually transferred over tap0 to eth0. The router (2001:db8::1) send a neighbor solicitation for the client (2001:db8::100:abc:2) to eth0 after it receives the ICMP6 echo-request. The server does not respond to that solicitation, which causes the ICMP6 echo-request not be routed to the destination. How can I make this IPv6 connection work?

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