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• Restrict VPN Clients to VPN Server

  - by Sprotty

  I've setup a VPN server using Debians pptpd. This all works, but I want to restrict incoming connections so they can only access ports on the VPN server and not get access to other machines on the VPN servers local network. I'm guessing this is a firewall rule? but i'm new to linux so am struggling a bit... ---- Additional info ----- The VPN Server is also hosting an SVN server, which is its real purpose, and the only service I want it to expose to incoming connections. I guess I could expose the SVN server directly, but I'm not confident that I could secure this correctly, so a VPN seemed to give an additional layer of security.

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• virtualbox port forwarding - firewall config

  - by Roose

  i have a ubuntu host system with virtualbox running a windows server. In Virtualbox i have configured the network with a NAT interface and port forwarding for the RDP deamon running inside the vm. That works really well - i can connect to the windows rdp service over the internet. TCP *:3389 - *:3389 Now i like to restrict the access to the rdp service to only 3 public ip addresses and have no idea how to do that via iptables / shorewall. Something like: ACCEPT net:91.x.x.x fw tcp 3389 (shorewall rule) isn't working. Would be glad for any hint.

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• how to configure svn between two remote system on different network?

  - by Ghost Answer

  The story is that I have two systems on two different network IPs (like client on 10.0.15.24 and server on 117.152.18.140). I am communicating between them by team viewer port 80. I have installed svn subversion on server and svn client on client system. I also installed apache server on server system. Now my question is that I want to configure them. first is it possible, if yes, then please give the proper suggestion. Is there any changes to be make in firewall on server or client or both. thanks

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• Why would the servers network type change from Private to Public?

  - by Phil Hannent

  Just found a fault with a server, other users have had problems connecting to it. The setting on the network card had changed from Private (domain) network to Public (the other option being Home). The switch to the network interface would have caused the firewall to block a lot of normal functions. I am guessing that since the event log showed no reason for the change that it might be due to a complete shutdown we had recently where someone powered up the machines, however the domain controllers might not have been booted up first. Any confirmation that this might be the case?

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• Linux - Block ssh users from accessing other machines on the network

  - by Sam

  I have set up a virtual machine on my network for uni project development. I have 6 team members and I don't want them to SSH in and start sniffing my network traffic. I already have set the firewall on my W7 pcs to ignore any connection attempts from the Virtual Machine, but would like to go a step further and not allow any network access from the VM to other machines on my network. Team members will be access the VM by SSH. The only external port forwarded is to vm:22. The VM is running in VirtualBox on a bridged network connection. Running latest Debian. If someone could tell me how to do this I would be much obliged.

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• Why does this article state that graduate education liberate one from concerns like the efficiency of hardware-based integers?

  - by kadaj

  Quoting The Evolution of Haskell Programmer, graduate education tends to liberate one from petty concerns about, e.g., the efficiency of hardware-based integers What exactly does this suggest? Is it that after graduation, one gets more interested in abstract ideas so much that he does not think hardware is relevant? Or that hardware is also abstracted and one is more interested in algorithms? I am trying to understand on what grounds the sentence is based.

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• Most secure way to have IPtables auto-loaded using Debian / Linux

  - by networkIT

  I'd like to know the safest way to load iptables using Debian. Of course, I can use a script that uses iptables-restore : #!/bin/sh iptables-restore < /etc/firewall.conf but : 1) where is the safest place to have it loaded ? /etc/network/if-up.d ? I'm concerned about the script being loaded early enough at boot time, and reliably enough when plugging/unplugging interfaces ... 2) is this script method using iptables-restore the most secure way ? 3) additionnally, how much does the answer validity stretch to other Linux distros ( Ubuntu, Fedora, CentOS ) ? Thanks ^^

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• How to show what proxies/firewalls are enabled on Windows XP?

  - by Stephen Melrose

  Hi, I'm trying to fix a Windows XP PC that is having a strange problem. The computer can't seem to connect to the internet, even though an internet connection is present. The router and internet is working fine as I've connected a laptop to it via LAN and wireless and both worked fine. The PC in question is connected to the router as it has an IP from the DHCP. The problem is I can't connect to nor ping any internet address from the PC. I can't even connect to the router admin itself. I've tried both LAN ports in the PC, same problem and both. I'm assuming there's a proxy or firewall on the PC stopping the connections, I just don't know how to find them or see which one is causing the issue. So my question is how do I on Windows XP display the system proxy settings and/or any firewalls that are running? Cheers.

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• Internet connection sharing windows server 2008 R2

  - by This is it

  I have one windows server 2008 r2, and that server has 4 network interfaces (3 private, 1 internet connection). I would like to share internet connection with other 3 networks. Windows server firewall should make logs of data that is transfered. It should not be possible to connect directly to private networks from internet. How could I do it? Edit: I tried with NAT in RRAS, but it doesn't work. Here is the configuration: Server: IP private:192.168.0.1 IP public: xx.xx.xx.xx client IP:192.168.0.2 Default gateway: 192.168.0.1 Public and private interface added in NAT section of RRAS.

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• How can I get rid of the long Google results URLs?

  - by Teifi

  google.com is always shielded by our firewall. When I search something at google.com, a result list appears. Then I click the link, the URL changes to a processed url like: http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CDcQFjAA&url=http%3A%2F%2Fwww.amazon.com%2F&ei=PE_AUMLmFKW9iAfrl4HoCQ&usg=AFQjCNGcA9BfTgNdpb6LfcoG0sjA7hNW6A&cad=rjt Then my browser is blocked because of google.com I guess. The only useful information in that long like processed URL is http%3A%2F%2Fwww.amazon.com(http://www.amazon.com). My quesitons: What's the meaning of that long like processed URL? Is there a way to remove the header google.com/url?sa.. each time I click the search results?

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• Hardware Mediaplayer display

  - by Eric Audio

  I'm looking for a keyboard or just a little display to attach on my keyboard or something like that, what will show me the music tracks i'm playing in windowsmedia player, itunes, etc. I did some research and the only thing I found are gaming keyboards, but i'm not shure if these show my music tracks. So my question: Does somebody knows a keyboard who show the music tracks or just a little display? Bye, Eric

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• Hardware for Capturing Packets

  - by Kevin

  One of my clients is a small school district in Texas. Like any school, they often have problems with network'd peripherals such as printers, et al. It would be nice to be able to simply "listen" to what the printer and PC are saying to each other (or not saying more importantly)... The problem is that I can't find old-style "hubs" anymore, and even if I could, it's not a long-term solution. All of the devices that I have found to replicate the purpose of a simple hub are either $100+ or are difficult to throw into a networking tool kit (aka my backpack)... Now that hubs are dead, what's the new low-cost standard for simple packet capture in the networking world?

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• Hardware imposed 32-bit limit

  - by knittl

  i'm thinking about converting my OS (ubuntu) to the 64 bit version to use the last bit of memory (4 gb)—ok, it's rather reinstalling … will this work as expected or are there possible limits given by the mainboard/memory controller/some other component, so i cannot fully utilize my full ram? if so, are there benefits from upgrading anyway?

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• Hardware imposed 32-bit limit

  - by knittl

  i'm thinking about converting my OS (ubuntu) to the 64 bit version to use the last bit of memory (4 gb)—ok, it's rather reinstalling … will this work as expected or are there possible limits given by the mainboard/memory controller/some other component, so i cannot fully utilize my full ram? if so, are there benefits from upgrading anyway?

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• Tracing what program is making a network connnection? (CentOS)

  - by Airjoe

  I was wondering if it is possible to find out which process is trying to make a specific network connection. On a server I support which hosts websites for about 200 users, the iptables firewall keeps blocking, as it should, a connection to 212.117.169.139 on port 80. Firefox reports this as an attack page (and at the least is obvious spam, if not malicious). It seems something on this server is trying to access this site for some reason, and although it's being blocked successfully, the requests seem to be going through every two to sixty seconds and I'd like to be able to find what process or script is doing this so I can handle it appropriately. Besides doing a grep to try and find if this IP is in some file (which probably won't even work because it may be working by hostname or it may be encoded), is there any way to find out some more information? Thanks!

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• Process vsserv.exe attempts connection to unknown host (clients.your-server.de)

  - by pushpraj

  from past few day I notice a new connection is being made from my system, I discovered it within the outpost firewall, it is blocked by default with the reason Block Transit Packets in the image above you can see that the process vsserv.exe is attempting a connection to static.88-198-155-41.clients.your-server.de I tried to search on google but could not find any relevant info, however this link http://www.webmasterworld.com/search_engine_spiders/3963600.htm says that your-server.de hosts bad bots. I am bit concerned if something is not correct. Could you help me understand the same?

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• Install graphics card hardware drivers via remote desktop in Windows 7

  - by Mat Banik

  I come across the same problem over and over. I working on computer that is remote and it is missing graphics card drivers. Just has some default drivers that have limited resolution. I would like to install program that will read the chipset on graphics card and tell me the values so I can go on manufacturer website and download the appropriate drivers. Windows 7 or Windows XP application would do, if you know about any.

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• Just installed Ubuntu 10.10, can't connect via SSH

  - by swilliams

  I've just downloaded and installed Ubuntu 10.10 in a VM on virtualbox (4.0.4). Everything on the VM is set to the defaults: NAT adapter. When installing the OS, I selected OpenSSH, and nothing else. I've tried to connect to the server via ssh from the host (running Mac OS X), but it only timeouts. Can't scp my credentials to it or ping the server either. As far as I can tell, the server is connected fine, has a valid IP, and can ping google.com. I know I'm missing something basic here... I don't believe I have any kind of firewall up, unless there's one I don't know about that comes with the install. iptables has the default configuration.

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• Packets marked INVALID in FORWARD rule

  - by Raphink

  I have a firewall that has 3 IP aliases on 1 physical interface. Packets get dropped between these 3 interfaces (either ICMP, HTTP, or anything else). We tracked it down to these packets being marked INVALID in the FORWARD rule and dropped due to the this rule: chain FORWARD { policy DROP; # connection tracking mod state state INVALID LOG log-prefix 'INVALID FORWARD DROP: '; mod state state INVALID DROP; mod state state (ESTABLISHED RELATED) ACCEPT; } (That is, we see the INVALID FORWARD DROP logs in dmesg) What could be causing this?

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• Windows IPSec computer authentication using *user* account?

  - by Tim Brigham

  For some reason every once in a while it happens that my IPSec authentication is from a user account to a computer account, not computer to computer. How can I fix it? Sometimes - notably when I try to add a new workstation through ePO but it's happened other times as well I'm getting strange behavior from my Windows Advanced Firewall IPSec. This causes the authentication to be invalid (as the group memberships, etc all assume computer accounts). I have no idea why this is happening or how to fix it but the IDs to match up between servers (the opposite server in my second example has remote ID timb).

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• Advice for outdoor wifi hardware and topology

  - by Robot

  I haven't setup any wifi networks other than an access point or two at any single location, so I'd like advice on how to setup an outdoor/weatherproof network in an area approximately 150 feet by 200 feet. The interesting thing is there are a pair of pools in the middle of the coverage area. Here is a picture: blue is pool, green is coverage area, yellow is building with wired access. Can anyone advise me on weatherproof APs, antennas and placement for best coverage of the pool deck? I've looked at the Meraki stuff, but I'm thinking it's overkill.

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• IOS not saving evaluate rule in access-list

  - by DeeJay1

  Hi. I have a basic firewall set up on an pretty od IOS in form of IPv6 access list exterior-in6 evaluate exterior-reflect sequence 1 permit ipv6 any host [my external address] sequence 10 permit tcp any host [my internal address] eq 22 sequence 11 permit icmp any any sequence 800 permit udp any any range 6881 6889 sequence 900 permit tcp any any range 6881 6889 sequence 901 deny ipv6 any any sequence 1000 IPv6 access list exterior-out6 permit ipv6 [my internal subnet] any reflect exterior-reflect sequence 10 Unfortunately the evaluate exterior-reflect sequence 1 line seems to get lost after each reboot, leaving my internal network without access. Any ideas?

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• Buying a new PC with fast hardware features

  - by Hooshkar

  I am web designer/developer, and I design and code "Premium Wordpress Themes" and HTML Websites. I wish to buy a new PC system with fast features, and will be installing virtual machines too. What kind of PC system would be best for a professional web designer/developer. Tell me the PC specs, e.g processor, motherboard, how much hard drive, RAM, graphic card etc. Don't really care about the price.

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• Cloud hosting and single hardware point of failure?

  - by PeterB

  From talking to sales I thought Rackspace Cloud was running on a SAN and compute nodes (as VMWare's offerings do), only to find out it doesn't, so when the host server goes down for maintenance all cloud servers on the server go down (in our case for 2.5 hours). I understand Amazon EC2 also has this single-server point of failure. Which cloud hosting solutions don't rely on a single server? I've yet to find a list by architecture Is there a term that distinguishes between these types of 'cloud'? Is one of these 'grid computing' and the other 'virtualisation'? Can a SAN backed solution provide the same reliability as 2 mirrored cloud servers on (say) Rackspace Cloud? I am more familiar with the VMWare architecture and would like to understand the advantages and disadvantages of each approach. I understand the standard architecture is to have multiple cloud servers and mirrored data between them; until we need multiple database servers I'm wondering if a SAN/node hosting solution would provide the lack of downtime we need without the added complexity.

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• RemoteFX Hardware For Home Use

  - by The Woo

  I would like to setup Windows Server 2008 R2 using RemoteFX at home, for a couple of users to all use the server (instead of buying each user a seperate computer). I have been trying to find what processors (Intel based) that support the SLAT that is apparently needed to run RemoteFX. I currently have a computer that has an i3 processor, but after testing it shows that it will not support it. Does anyone know which processors from Intel do support this?

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