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• OpenVPN IPv6 over IPv4 tunnel

  - by user66779

  Today I installed OpenVPN 2.3rc2 on both my windows 7 client machine and centos 6 server. This new version of OpenVPN provides full compatibility for IPv6. The Problem: I am currently able to connect to the server (through the IPv4 tunnel) and ping the IPv6 address which is assigned to my client and I can also ping the tun0 interface on the server. However, I cannot browse to any IPv6 websites. My vps provider has given me this: 2607:f840:0044:0022:0000:0000:0000:0000/64 is routed to this server (2607:f840:0:3f:0:0:0:eda). This is ifconfig after setup with OpenVPN running: eth0 Link encap:Ethernet HWaddr 00:16:3E:12:77:54 inet addr:208.111.39.160 Bcast:208.111.39.255 Mask:255.255.255.0 inet6 addr: 2607:f740:0:3f::eda/64 Scope:Global inet6 addr: fe80::216:3eff:fe12:7754/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2317253 errors:0 dropped:7263 overruns:0 frame:0 TX packets:1977414 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1696120096 (1.5 GiB) TX bytes:1735352992 (1.6 GiB) Interrupt:29 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:10.8.0.1 P-t-P:10.8.0.2 Mask:255.255.255.255 inet6 addr: 2607:f740:44:22::1/64 Scope:Global UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1 RX packets:739567 errors:0 dropped:0 overruns:0 frame:0 TX packets:1218240 errors:0 dropped:1542 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:46512557 (44.3 MiB) TX bytes:1559930874 (1.4 GiB) So OpenVPN is sucessfully creating a tun0 interface and assigning clients IPv6 addresses using 2607:f840:44:22::/64. The first client to connect is getting 2607:f840:44:22::1000 and the second 2607:f840:44:22::1001, and so on... plus 1 each time. After connecting as the first client, I can ping from my windows client machine 2607:f740:44:22::1 and 2607:f740:44:22::1000. However, I have no access to IPv6 websites. I believe the problem is that the tun0 IPv6 addressees are not being forwarded to the eth0 interface. This is the firewall running on the server: #!/bin/sh # # iptables configuration script # # Flush all current rules from iptables # iptables -F iptables -t nat -F # # Allow SSH connections on tcp port 22 # iptables -A INPUT -i eth0 -p tcp --dport 22 -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 22 -j ACCEPT # # Set access for localhost # iptables -A INPUT -i lo -j ACCEPT # # Accept connections on 1195 for vpn access from client # iptables -A INPUT -i eth0 -p udp --dport 1195 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p udp --sport 1195 -m state --state ESTABLISHED -j ACCEPT # # Apply forwarding for OpenVPN Tunneling # iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -s 10.8.0.0/24 -j ACCEPT iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to 209.111.39.160 iptables -A FORWARD -j REJECT # # Enable forwarding # echo 1 > /proc/sys/net/ipv4/ip_forward # # Set default policies for INPUT, FORWARD and OUTPUT chains # iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT # # IPv6 # IP6TABLES=/sbin/ip6tables $IP6TABLES -F INPUT $IP6TABLES -F FORWARD $IP6TABLES -F OUTPUT echo -n "1" >/proc/sys/net/ipv6/conf/all/forwarding echo -n "1" >/proc/sys/net/ipv6/conf/all/proxy_ndp echo -n "0" >/proc/sys/net/ipv6/conf/all/autoconf echo -n "0" >/proc/sys/net/ipv6/conf/all/accept_ra $IP6TABLES -A INPUT -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT $IP6TABLES -A INPUT -i eth0 -p tcp --dport 22 -j ACCEPT $IP6TABLES -A INPUT -i eth0 -p icmpv6 -j ACCEPT $IP6TABLES -P INPUT ACCEPT $IP6TABLES -P FORWARD ACCEPT $IP6TABLES -P OUTPUT ACCEPT Server.conf: server-ipv6 2607:f840:44:22::/64 server 10.8.0.0 255.255.255.0 port 1195 proto udp dev tun ca ca.crt cert server.crt key server.key dh dh2048.pem ifconfig-pool-persist ipp.txt push "redirect-gateway def1 bypass-dhcp" push "dhcp-option DNS 208.67.222.222" push "dhcp-option DNS 208.67.220.220" keepalive 10 60 tls-auth ta.key 0 cipher AES-256-CBC comp-lzo user nobody group nobody persist-key persist-tun status openvpn-status.log log-append openvpn.log verb 5 Client.conf: client dev tun nobind keepalive 10 60 hand-window 15 remote 209.111.39.160 1195 udp persist-key persist-tun ca ca.crt key client1.key cert client1.crt remote-cert-tls server tls-auth ta.key 1 comp-lzo verb 3 cipher AES-256-CBC I'm not sure where I am going wrong, it could be the firewall, or something missing from server or client.conf. This version of OpenVPN was only released yesterday, and there's little info on the internet about how to setup an IPv6 over IPv4 vpn tunnel. I've read the manual for this new version of OpenVPN (parts pertaining to IPv6) and it provides very little info too. Thanks for any help.

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• Ping myself, works with ipv6 not ipv4 in Windows 7

  - by user68546

  Hi! I've tried to solve the following problem with no luck and I need some proffesional help. The following is possible: Ping all computers (that I tried) in the domain without problem. Ping myself with localhost which use ::1. Ping myself with my given ipv6 IP. Internet access. The following is not possible: Noone can ping me (request timeout) with computername/ipv4/ipv6. I cannot ping myself with my given ipv4 IP or 127.0.0.1 (request timeout). Tried to enable/disable TCP/IPv4. Same issue. Turned off windows firewall. Added an inbound rule to allow icmp (just in case). Same same.. Is there someone out there that has any idea what the issue could be? Any help would be most appreciated!

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• Routing between two subnets. (Need Solution)

  - by rehanplus

  Need help according to scenario given: Client end PCs: 400 + Network : Server 1 (Linux) : 192.168.2.0/24 (For Application, Internet not working) GW: 192.168.2.1 Clients: 192.168.2.1 - 254 Server 2 (Linux) : 192.168.3.0/24 (For Internet users) GW: 192.168.3.1 Clients: 192.168.3.2 - 254 Server 2 is connected to DSL Broadband. Server 1 and Server 2 both are on same physical network i.e. Same switches. Current issue: i have to deploy a file and print server but this server will be accessed by both (192.168.2.x and 192.168.3.x) one same workgroup. as both subnets are on same switched network. Limitations: Currently there is no hardware routers and firewall. Need to complete this task with Linux / Windows / AD. Tested / Worked so far: Configured one PC with two NIC's With the IPS: NIC 1 : 192.168.3.2 GW: 192.168.3.1 Subnet: 255.255.255.0 NIC 2 : 192.168.2.2 GW: Empty Subnet: 255.255.255.0 Kindly provide any solution what should i do to get sharing enable on both Subnets. Thank you All

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• SSH Server Timeout on port 22 but not on higher port

  - by mikelberger

  If I run an SSH server on my Windows 2008 server box on the default port 22 I always get Operation Timed Out on the client. If I run it on another port (say 2222) it works fine. I've opened up the firewall. Netstat shows that the server is listening on the correct port. I have used two different Windows SSH servers (freeSSHd and WinSSHD) and they both have the same result. What else could be causing the difference between running the SSH server on port 22 versus port 2222?

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• cisco asa query dns external

  - by Alpacino

  my lab network asa firewall below 10.10.10.20 -- ASA --- 192.168.1.10 -- website external my client 10.10.10.20 want to access website external and i create nat nat (inside,outside) static 192.168.1.10 and access list access-list outside-acl extended permit tcp any host 10.10.10.20 eq www access-list outside-acl extended permit tcp any host 10.10.10.20 eq domain access-list inside-acl extended permit tcp 10.10.10.0 255.255.255.0 any eq www access-list inside-acl extended permit tcp 10.10.10.0 255.255.255.0 any eq domain access-group outside-acl in interface outside access-group inside-acl in interface inside when i access to website with domain name it can't access but i access website with ip address it work please help me to solve problem thank you

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• Can only connect to IIS site through localhost

  - by Rembrandt Q. Einstein

  I'm building a web service for my company's iPhone application, and everything's been working smoothly by running tests through localhost on the development machine. I'm now in the phase where I need to test connections from other computers within the network, and any connection other than localhost gives me a 404. My internal IP, 127.0.0.1, and computername all get 404 when connecting from any computer, either the one the site's hosted on or any others on the network. Telnet can get through to port 80, and I've temporarily disabled all firewalls on this machine (I do not have control over the external firewall, but I'm only testing connections within the network) Does anyone have a clue why this is happening? I was able to connect to the web service from other computers when hosted on a Mac via Apache, but because I'm now using a SQL Server connection I'm restricted to using IIS for Windows Authentication. Googling only provided answers related to firewalls, and mine is disabled note: I cannot use Anonymous Authentication, but even in testing that it did not affect the issue.

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• Web server suddenly stopped working

  - by wezten

  I have a web server, which was working fine. It also was an FTP server and a Windows Remote Desktop server, all working fine. Someone called our ISP to increase the internet speed, and suddenly nothing works - I can connect with Teamviewer, but HTTP, FTP & RD doesn't work. Disabled firewall. Ran Wireshark - the packets don't come through at all. Set the webserver to port 20111, in case the ISP is blocking port 80, and again, the packets didn't come through at all. (localhost:20111 works fine) Port forwarding is set up for ports 80, 21, 3389 & 20111 to 10.0.0.32 (which is the correct address - checked with ipconfig). Restarted router and computer. I would be very grateful for any help.

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• Windows 7 with two network cards doesn't route traffic

  - by Tomek

  I have simple task to do: I have wni7 with two nics.I want to connect another comp(osx) to win7 through second nic to connect it to internet. I already changed the registry. Win7 interface with 192.168.2.1 has no gateway set (no point to do that) OSX interface with 192.168.2.2 has gateway set to 192.168.2.1 I do not add any routes on win7, every thing seems to be already there network on second nic is detected as "undefined network" (probably effect of no gateway) i can achieve any connectivity to internet from OSX only by enabling network connection sharing on nic with 192.168.2.1, but it enables NAT and I'm interested only in pure routing without nat(it's a setup for some research). firewall is off. It seems to me that win7 refuses to forward packets for some reason. Perhaps "undefined network" and NLA service is to blame, although i couldn't find any info about that. Below ascii schematics of my setup: internet<--router(192.168.1.1)<--(192.168.1.1) WIN7 (192.168.2.1)<--(192.168.2.2)OSX Thanks

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• Direct Access on Server 2012

  - by francisswest

  Scenario: Windows Server 2012 with the Remote Access role installed. IP set to static, registered DNS. 3 domain controllers, all running Server 2003 (I suspect this may be the issue) Done so far: DNS registered, firewall turned off after IPsec was applied. Able to ping all 3 DC's with no issues Problem: Going through the DA wizard generates this error. I am logged in as a domain admin, verified that I can ping the DC, verified IPsec allows me to contact it. Since this version hasnt been readily deployed yet, there isnt much help available online from what I can find. Any assistance ayone could provide would be greatly appreciated. I am still new to the server world as far as things are considered. I would fit, user wise, between Superuser.com and serverfault.com (junior admin) Thanks to anyone who may be able to assist!

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• cisco vpn client randomly disconnects with pfSense

  - by Andre

  My network has two gateways, one is a pfSense box that everyone uses. The other one is a TP-Link firewall essentially for tests. Some machines inside my network need to access a VPN through the Cisco VPN client. If one of those machines is using the pfSense box as the gateway, I experience random connection drops on the VPN. If I am using the TP-Link gateway that doesn't happen. I've tried changing the MTU in the pfSense box and that improved things a little bit but didn't really solve the problem. I also followed the guidelines for traffic shaping in pfSense and the connections still drop quite often. Ideas?

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• how to set up domain name, bad request invalid hostname

  - by user45645

  assume i have a domain name which will be forwarded to my public ip (web server) automatically. in IIS 6, ip is public ip port is 6666, advanced - host value is www.hello.com firewall is open for 6666(web server port) and 53(DNS port), DMZ of router is my physical address in DNS, i have already had a zone called oldhello.com. And i expect a new domain name. So i have addded a new zone called hello.com and checked SOA server (P) is one.hello.local. then added a new host called one, full name is one.hello.com, ip address 192.168.7.3(my address in router) and then add a alias(CNAME) www, full name is www.hello.com, FQDN i choose the host i added before (one.hello.com) i expected that when i type the public ip in browser, can it be changed to domain name automatically. if not set host value www.hello.com, use public ip i can see the web however, after set up host value www.hello.com, browser show bad request invalid hostname

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• TCP/IP communication between Hyper-V host and guests

  - by Tedd Hansen

  This may be a simple one. :) I have a simple Hyper-V setup with a few guest os running. The host has 1 physical network adapter with a static IP assigned to it. The guests have network adapters assigned to "Internet" (Hyper-V network) which is bound to the physical host network adapter (Hyper-V "External" connection type). I am not able to communicate (ping or anything else) between guests and host. I've checked firewall and it seems fine (ports open from anywhere still don't work). I'm trying to communicate with the hosts IP assigned to the same physical interface that the guests are sharing. Guests can communicate between them just fine. I can't seem to find any relevant setting (I might just be missing it). So my questions: How do I fix it so host and guests can communicate?

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• Question regarding IPv6 - Solicited-Node Address with a Link local scope

  - by Pulse

  Situation: A small LAN comprising a Windows 7 Ultimate x54 PC, 2 XP Pro x86 PCs and an Asus router.The Win 7 box has IPv6 enabled. There are no other IPv6 enabled devices on the LAN. In my firewall I see numerous requests originating from the Win 7 PC, which are for the Multicast address ff02::1:ff.... which is a Solicited-Node address query and has a scope of 2 which equates to the local link. As far as I knew local link addresses are filtered by routers, hence local link. Given that situation I'm wondering why I'm seeing these queries being generated to various addresses? Any ideas? Thanks.

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• Internet wireless connected with limited access, windows vista

  - by Wawa wiya

  Hello I had some malware in my computer so I did a bit of manual work to remove it including resetting TCP/IP. Now the malware is gone. I can see my home wireless network and I can get connected to it but when connected I get the Internet wireless connected with limited access message. When I go to the IE I cannot browse. When I tried to ping 192.168.1.1 I got an Error Code 1231 Unconnected Network Problem. I have deactivated my Windows firewall as I thought it could be hyperactive security. Still no luck. I have Norton but it is not active, I have also Avast and AVG installed but they are not active. Any ideas?

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• What is the best way to auto failover to backup WAN link for web server

  - by user66735

  Hi Iam looking for the best way to ensure my server ( application ) remains available for all my users (on web/LAN/WAN ), when my primary ISP link fails. My server is behind a firewall on which both my primary & secondary links land. I have already assigned multiple IPs (both ISP's static IP) to the 'A' record ( host.example.com ) in the DNS. However in a round robin scenario is there a way I can ensure that my web user will not see a "cannot dislay web page" error ever ?? What are the better methods to achieve this??

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• Can't set up Usermin correctly to allow users to login outside of local network, what am I missing?

  - by thecraic

  I'm fairly new at creating a server, but the biggest problem I am currently having at the moment is getting Usermin set up to be accessible from outside the LAN. I talked to other people that use it and was told that all I need to do is type the url:20000 to access the login screen, but that doesn't work. I have also tried the ip:20000 and that doesn't lead to anything. Instead I get the error message: Error - Bad Request This web server is running in SSL mode. Try the URL https://hostname:10000/ instead. (where hostname is my server's hostname) I know it must be a configuration issue, but I have checked all my settings and as far as I can tell I don't have the ports blocked anywhere. I have the correct ports forwarded on my router and my server firewall doesn't have the port block either. Is there anything I am missing? Any help would be appreciated and I will add more information upon request. Thank You.

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• Windows 8.1 VPN Connection Crash

  - by Anthony Russell

  I am attempting to connect to a VPN that I have used for quite some time. I followed these instructions to setup my VPN on both my desktop and my surface pro Both my desktop and surface pro have all of the current updates for Windows 8.1. However, my surface pro connects to the VPN without issue and my desktop crashes when I attempt to do ANYTHING VPN related. If I Attempt to connect to a VPN it freezes and crashes without error as soon as I hit connect Attempt to remove a VPN it freezes and crashes without error as soon as I hit remove Attempt to connect to a newly created VPN it freezes and crashes without error as soon as I hit connect I have tried disabling all Windows Firewall proticols. I have tried disabling the Windows Defender antimalware shenanigans I have no other antimalware, virus or firewalls on this machine. I am at a loss on how to fix this so any insight is appreciated.

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• Using Zentyal to control several servers

  - by user1301428

  I am currently in the process of creating a home server, made up of several virtual machines, each running a different type of server (i.e. a file server, a multimedia server, a firewall and a print server as of now). Today I discovered this new software, Zentyal, which looks interesting for system and network administration. However, I haven't understood one thing: can it be used only with its preconfigured packages or can it also be used to control other servers running other programs (in my case, the four virtual machines)?. Also, would you suggest to use such a program or do you think it's better to control each server on its own?

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• How can I tell if my ISP is redirecting my DNS queries?

  - by Nack

  I've attempted to use some DNS services like OpenDNS, and no matter what I do the DNS queries don't return the expected results. Watching the packet traffic on my firewall, I can see the queries go out to the intended DNS server address and responses coming back, but the results are not as expected, for example, the OpenDNS test page always fails even though the requests appear to be going to their servers. I suspect my ISP is intercepting DNS queries and sending them to their own servers. Is there a way to verify this? Is there something else I might be missing? I'm using 3G wireless service from Sprint.

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• My computer is playing audio without any program open

  - by super x man

  This is the weirdest thing ever that has happened to my computer (running Windows 7). I haven't installed anything lastly, except lavasoft adware antivirus When my computer stats then audio starts playing, mostly hip hop There is no programs opened. I tried killing all unknown processed, no success. I tried resetting the firewall options of the antivirus, no success. If I disconnect from internet, then it works. The antivirus is not detecting anything. Is somebody is streaming from another house? Is that possible? and making my life impossible. How can I check and stop this?

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• Little server for a little network: Asus TS Mini + Windows Home Server or other?

  - by microspino

  Hello, I'm building a little network with 4 computer a plotter, 3 printers an a HP Fax/Scan/Copy/Print machine. The network is connected to the web by a D-Link router/firewall. I would like to add little server to have file sharing (reachable via VPN from outside by a single user-road-warrior), automatic backups. I would like to avoid big electrics bills or, to say It in a green way, I would like to avoid useless power consumption made by a big server with hot-plug, Raid, double PSU because I don't need all this stuff. The server must work 24/7 and the budget is between 400€ and 1000€. I'm evaluating the Asus EEE Box (with XP), a TranquilPC (with XP), a FitPC (again with XP), and an Asus TS Mini (with Windows Home Server). I like the latter but since I'm Europe I don't know where I can buy It. Do you have any suggestion/experience to share with me about: which hardware do I have to buy ? which O.S. ?

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• Windows Xp, Svchost.exe connecting to different ips with remote port 445

  - by Coll911

  Im using Windows Xp professional Sp2 Whenever i start my windows, svchost.exe starts connecting to all the possible ips on lan like from 192.168.1.2 to 192.168.1.200 The local port ranges from 1000-1099 and the remote port being 445. After its done with the local ips, it starts connecting to other random ips. I tried blocking connections to the port 445 using the local security polices but it didn't work Is there any possible way i could prevent svchost from connecting to these ips without involving any firewall installed ? since my pc slows down due to the load I'd be thankful for any advices

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• Access to local network machine

  - by Jirka Kopriva

  I have granted new setting from my domain provider. Domain with specific port is pointing on computer in local network (fixed ip) like: mydomain.com:87 -> 192.168.1.1 Local machine is running on win server 2008. Everything works fine on local network. But mydomain.com:87 is not working. Are there extra settings for win server to allow connection from outside? (Firewall is turned off while searching for working result.)

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• What is needed for 'Previous Versions' to be visible on the client OS?

  - by Zoredache

  I have servers with Shadow Copies enabled taking snapshots a couple times a day. From the server, if you look at the local devices you can see the Previous Versions being populated reliably. But from remote clients, the ability for an end-user to see the Previous Versions seems to be very hit-or-miss. For the sake of this question you can assume that all my clients are Windows 7 and the Servers are Windows Server 2008 R2. Is there an exhaustive list of everything that is required for end user to see Previous Versions? Are their any requirements for a certain level of share or filesystem permissions, other then read access? Does something need to be open on the firewall, other then what is already in-place for normal Windows networking?

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• Intermittent timeout when connecting to Sql Server, what do I look for?

  - by Will

  Sql Server 2008 Standard 64bit on Windows Server 2008 R2 virtual machine hosted on a Hyper-V server. I'm getting intermittent timeouts when connecting to the server. This happens for both windows and Sql Authentication. May timeout every 2 out of 5 tries in different applications. When the connection times out, I can see (in Profiler) that no connection was made. Firewall is holey, server port is static (good ol' 1433). If I ping /t the server I get a steady connection that wavers between 1 and 2 ms. Any ideas what else to try would be appreciated, thanks.

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