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• Appropriate to Stateless Autoconfigure a Server?

  - by user31498

  I am setting up a network to support IPv6. Stateless Autoconfiguration seems to be the preferred way to get an IP address on an IPv6 network but is this the preferred way for a server? Other machines outside of the network are going to need to be able to talk to the server. Is it preferable to give the server a static IP address or is there something fancy that can be done with DNS to keep track of the server address?

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• Client unable to reach Internet through OpenVPN

  - by Carroarmato0

  The clients can all connect through OpenVPN. OpenVPN serves the following pool: server 10.8.0.0 255.255.255.0 I've configured the server's iptable with the following rule: iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE and echo 1 /proc/sys/net/ipv4/ip_forward This used to work back on the old vps I used. Now I've migrated to a vps which has ipv6 connectivity. Is it possible that Ipv6 has something to do with the fact that the clients can't reach the internet?

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• Week in Geek: IPv6 Capable Smartphones Compromise User Privacy Edition

  - by Asian Angel

  This week we learned how to “clone a disk, resize static windows, and create system function shortcuts”, use 45 different services, sites, and apps to help read favorite sites, add MP3 support to Audacity (for saving in MP3 format), install a Wii game loader for easy backups and fast load times, create a Blue Screen of Death in any color, and more. Photo by legofenris. Weekly News Links Photo by The H Security. IPv6: Smartphones compromise users’ privacy Since version 4 of the iOS operating system, Apple’s iPhones, iPads and iPods have been capable of handling IPv6, and most Android devices have been capable since version 2.1. However, the operating systems transfer an ID that discloses information about their users. Dumb phones can be attacked too Much of the discussion of security threats to mobile phones revolves around smartphones, but researchers have found that less advanced “feature phones,” still used by the majority of people around the world, also are vulnerable to attack. SCADA exploit – the dragon awakes The recent publication of an exploit for KingView, a software package for visualising industrial process control systems, appears to be having an effect. Threatpost reports that both the Chinese vendor Wellintech and Chinese CERT (CN-CERT) have now reacted. Sophos: Spam to get more malicious Spam is becoming more malicious in nature as trickery tactics change in line with current user interests, according to a new report released Tuesday by Sophos. Global spam traffic rebounds as Rustock wakes Spam is on the rise after the Rustock botnet awoke from its Christmas slumber, according to Symantec. Cracking WPA keys in the cloud At the forthcoming Black Hat conference, blogger Thomas Roth plans to demonstrate how weak WPA PSKs can be cracked quickly and easily using Amazon’s Elastic Compute Cloud (EC2) service. Microsoft Security Advisory: Vulnerability in Internet Explorer could allow remote code execution Provides a link to more details about the vulnerability and shows a work-around/fix for the problem. Adobe plans to make it easier to delete Flash cookies in web browsers The new API, NPAPI:ClearSiteData, will allow Flash cookies – also known as Local Shared Objects (LSO) – to be deleted directly in the browser’s settings. Firefox beta getting new database standard The ninth beta version of Firefox is set to get support for a standard called IndexedDB that provides a database interface useful for offline data storage and other tasks needing information on a browser’s computer. MetroPCS accused of blocking certain Net content MetroPCS is violating the FCC’s recently approved Net neutrality rules by blocking certain Internet content, say several public interest groups. Server and Tools chief Muglia to leave Microsoft in summer 2011 Microsoft veteran and Server & Tools Business (STB) President Bob Muglia is leaving Microsoft, according to an email that CEO Steve Ballmer sent to employees on January 10. Report: DOJ nearing decision on Google-ITA The U.S. Department of Justice is gearing up for a possible formal antitrust investigation into whether or not Google should be allowed to purchase travel software company ITA Software, according to a report. South Korea says Google Street View broke law Police in South Korea reportedly say Google broke the country’s law when its Street View service captured personal data from unsecure Wi-Fi networks. The backlash over Google’s HTML5 video bet Choosing strategies based on what you believe to be long-term benefits is generally a good idea when running a business, but if you manage to alienate the world in the process, the long term may become irrelevant. Google answers critics on HTML5 Web video move Google responded to critics of its decision to drop support for a popular HTML5 video codec by declaring that a royalty-supported standard for Web video will hold the Web hostage. Random TinyHacker Links A Special GiveAway: a Great Book & Great Security Software The team from 7 Tutorials has a special giveaway running during the month of January. Signed copies of their latest book, full 1-year licenses of BitDefender Internet Security 2011 and free 3-month trials for everyone willing to participate. One Click Rooting For Android Phones Here’s a nice tool that helps you root your Android phone effortlessly. New Angry Birds Free version 1.0 Available in the App Store. Google Code University Learn programming at Google Code University. Capture and Share Your Favorite Part Of a YouTube Video SnipSnip.it lets you share only the part of the video that you like. Super User Questions More great questions and answers from this past week’s popular topics at Super User. What are the Windows A: and B: drives used for? Does OS X support linux-like features? What is the easiest way to make a backup of an entire hard disk? Will shifting from Wireless to Wired network result in better performance? Is it legal to install Windows 7 Home Premium Retail inside VMware virtual machine? How-To Geek Weekly Article Recap Enjoy reading through our hottest articles from this past week. The 50 Best Ways to Disable Built-in Windows Features You Don’t Want The Best of CES (Consumer Electronics Show) in 2011 How to Upgrade Windows 7 Easily (And Understand Whether You Should) The Worst of CES (Consumer Electronics Show) in 2011 The How-To Geek Guide to Audio Editing: Basic Noise Removal One Year Ago on How-To Geek More great articles from one year ago filled with helpful geeky goodness for you to enjoy. Share Text & Images the Easy Way with JustPaste.it Start Portable Firefox in Safe Mode Firefox 3.6 Release Candidate Available, Here’s How to Fix Your Incompatible Extensions Protect Your Computer from “Little Hands” with KidSafe Lock Prying Eyes Out of Your Minimized Windows Custom Crocheted Cylon-Cthulhu Hybrid What happens when you let your Cylon Centurion figure and your crocheted Cthulhu spend too many lonely nights together? A Cylon-Cthulhu hybrid, of course! You can get your own from the Cthulhu Chick store over on Etsy. Note: This is not an ad…Ruth is a friend of ours, and this Cylon-Cthulhu hybrid makes the perfect guard for the new MVP trophy in our office. The Geek Note Whether it is a geeky indoor project or just getting outside, we hope that you and your families have a terrific fun-filled weekend! Remember to keep sending those great tips in to us at [email protected]. Photo by qwrrty. Latest Features How-To Geek ETC How to Upgrade Windows 7 Easily (And Understand Whether You Should) The How-To Geek Guide to Audio Editing: Basic Noise Removal Install a Wii Game Loader for Easy Backups and Fast Load Times The Best of CES (Consumer Electronics Show) in 2011 The Worst of CES (Consumer Electronics Show) in 2011 HTG Projects: How to Create Your Own Custom Papercraft Toy Firefox 4.0 Beta 9 Available for Download – Get Your Copy Now The Frustrations of a Computer Literate Watching a Newbie Use a Computer [Humorous Video] Season0nPass Jailbreaks Current Gen Apple TVs IBM’s Jeopardy Playing Computer Watson Shows The Pros How It’s Done [Video] Tranquil Juice Drop Abstract Wallpaper Pulse Is a Sleek Newsreader for iOS and Android Devices

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• Can't ping my Window 7 machine from within a Windows XP virtual machine

  - by Jonathan Conway

  I have Windows 7 installed as my primary operating system, on a laptop that's on my home network (wireless). I'm using Microsoft Virtual PC 2007 SP1 to run a virtual machine of Windows XP SP3, in which I want to access the Windows 7 instance, both to browse a shared folder and access the local Apache server. So far I can ping my Windows 7 IP address (IPv4) and access the apache server through the web browser through HTTP. However using my machine name never seems to work. Pinging it fails, and I can't access my apache server using it either. The problem seems to be something to do with my machine's name being registered under IPv6 rather than IPv4. I'm at a loss what to do. Should I try to set up IPv6 on the virtual machine? Not sure how to go about that. Or maybe I should somehow get my machine name on Windows 7 to work with IPv4? Although I think it already does, because I can ping it from a separate box (running Ubuntu), which is only registered under IPv6.

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• Mangling traffic from a Mikrotik Router

  - by TiernanO

  I have a MikroTik powered Router in the house with a couple of internet connections (2 200/10Mb Cable modems and a 100/20Mb VDSL Line). I am using Mangle rules to set routing marks and NAT rules to do some load balancing, and everything seems to be going grand... But it only works for traffic from outside the router... Let me explain: I have 4 GigE ports on the machine, WAN1,2 and 3, and a LAN port named LAN1. All traffic from LAN1 is getting mangled (as it should be) but traffic from the load router itself (proxy traffic, IPv6 tunnels, VPN connections) are not being mangled. They get the first route to 0.0.0.0/0, which in my case is WAN2, and stick with it. So, how do I get traffic from the local router to be mangled? Originally it was proxy traffic that caused the problem, but now with IPv6 and VPN, they are more important to be mangled... last time i enabled IPv6 traffic, all traffic only went though WAN2, and the rest where unused... Any ideas?

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• ip6tables blocking output traffic

  - by jmccrohan

  My OpenVZ VPS is blocking outbound IPv6 traffic, but correctly filtering inbound IPv6 traffic. Below is my ip6tables-restore script. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -i lo -j ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p ipv6-icmp -j ACCEPT -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT -A INPUT -p udp -m udp --dport 1194 -j ACCEPT -A INPUT -p tcp -m tcp --dport 51413 -j ACCEPT -A INPUT -p udp -m udp --dport 51413 -j ACCEPT -A INPUT -m limit --limit 5/min -A INPUT -j REJECT --reject-with icmp6-adm-prohibited -A FORWARD -j ACCEPT -A OUTPUT -j ACCEPT COMMIT ICMPv6 traffic is still able to pass both inbound and outbound. When I flush these rules using -F, outbound traffic flows fine. What am I missing here? EDIT: It appears that ip6tables is marking ESTABLISHED packets as INVALID. Consequently, the outbound traffic is NOT actually being blocked. The reply packets are not allowed inbound again, hence appearing like blocked outbound traffic. Allowing INVALID packets inbound solves the outbound issue, but also renders the inbound filter useless.

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• Windows Server 2003 RDP not listening on IPv6

  - by Ian Boyd

  i have a Windows Server 2003 machine; with IPv6 enabled: Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : newland.local IP Address. . . . . . . . . . . . : 192.168.1.244 Subnet Mask . . . . . . . . . . . : 255.255.0.0 IP Address. . . . . . . . . . . . : 2001:470:¦¦¦¦:¦¦¦¦:¦¦¦:¦¦¦¦:¦¦¦¦:¦¦¦¦ IP Address. . . . . . . . . . . . : fe80::224:1dff:fe86:fdf2%4 Default Gateway . . . . . . . . . : 192.168.1.1 fe80::250:bfff:fe91:955f%4 i can connect to IIS server using IPv, remotely and locally, using IPv4 and IPv6: > telnet 127.0.0.1 80 (connects) > telnet 192.168.1.244 80 (connects) > telnet ::1 80 (connects) > telnet fe80::224:1dff:fe86:fdf2 80 (connects) And TCPView shows that the server is listening on port 80: Note: This is useful to establish that Windows Server 2003 does have support for IPv6 services. And i can connect to terminal services, locally and remotely, using IPv4: > telnet 127.0.0.1 3389 (connects) > telnet 192.168.1.244 3389 (connects) But i cannot connect to RDP, locally or remotely, over IPv6: > telnet ::1 3389 (fails to connect) > telnet fe80::224:1dff:fe86:fdf2 3389 (fails to connect) We can see that the system is listening on 3389: Except why won't it listen on port 3389 (ipv6)? Unfortunately it's not the firewall. Aside from the fact that i'm connecting locally (in which case the firewall doesn't apply), the firewall doesn't apply:

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• radvd is not assigning prefix

  - by Samik

  I'm currently trying to setup IPv6 address auto-configuration with router advertisement daemon (radvd) on a virtual machine running CentOS 6.5. But the eth0 interface is not obtaining that prefix. I've obtained the ULA prefix from here. Contents of /etc/sysctl.conf # Kernel sysctl configuration file for Red Hat Linux # # For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and # sysctl.conf(5) for more details. # Controls IP packet forwarding net.ipv4.ip_forward = 0 net.ipv6.conf.all.forwarding = 1 # Controls source route verification net.ipv4.conf.default.rp_filter = 1 # Do not accept source routing net.ipv4.conf.default.accept_source_route = 0 # Controls the System Request debugging functionality of the kernel kernel.sysrq = 0 # Controls whether core dumps will append the PID to the core filename. # Useful for debugging multi-threaded applications. kernel.core_uses_pid = 1 # Controls the use of TCP syncookies net.ipv4.tcp_syncookies = 1 # Disable netfilter on bridges. net.bridge.bridge-nf-call-ip6tables = 0 net.bridge.bridge-nf-call-iptables = 0 net.bridge.bridge-nf-call-arptables = 0 # Controls the default maxmimum size of a mesage queue kernel.msgmnb = 65536 # Controls the maximum size of a message, in bytes kernel.msgmax = 65536 # Controls the maximum shared segment size, in bytes kernel.shmmax = 68719476736 # Controls the maximum number of shared memory segments, in pages kernel.shmall = 4294967296 Contents of /etc/radvd.conf # NOTE: there is no such thing as a working "by-default" configuration file. # At least the prefix needs to be specified. Please consult the radvd.conf(5) # man page and/or /usr/share/doc/radvd-*/radvd.conf.example for help. # # interface eth0 { AdvSendAdvert on; MinRtrAdvInterval 3; MaxRtrAdvInterval 10; AdvDefaultPreference low; AdvHomeAgentFlag off; prefix fd8a:8d9d:808f:1::/64 { AdvOnLink on; AdvAutonomous on; AdvRouterAddr on; }; }; Contents of /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 HWADDR=52:54:00:74:d7:46 TYPE=Ethernet UUID=af5db1cb-e809-4098-be1a-5a74dbb767b1 ONBOOT=yes NM_CONTROLLED=no BOOTPROTO=dhcp IPV6INIT=yes IPV6_AUTOCONF=yes I've also enabled radvd at startup through chkconfig. Though I noticed that radvd is starting after interfaces are brought up. I've tried restarting the network service afterwards but still I get the following link-local address only #ip -6 addr show 1: lo: mtu 16436 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: mtu 1500 qlen 1000 inet6 fe80::5054:ff:fe74:d746/64 scope link valid_lft forever preferred_lft forever Edit: Based on the answer given by Sander Steffann I still need clarification on some points but I'm posting here what worked. Contents of /etc/sysconfig/network NETWORKING=yes HOSTNAME=syslog-ng-server NETWORKING_IPV6=yes IPV6FORWARDING=yes Contents of /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 HWADDR=52:54:00:74:d7:46 TYPE=Ethernet UUID=af5db1cb-e809-4098-be1a-5a74dbb767b1 ONBOOT=yes NM_CONTROLLED=no BOOTPROTO=dhcp IPV6INIT=yes IPV6_AUTOCONF=yes IPV6FORWARDING=no Removed following line from /etc/sysctl.conf net.ipv6.conf.all.forwarding = 1 Contents of /etc/radvd.conf is as previous.

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• Which software could I use to setup a 4in6 IP tunnel (RFC 2473) on GNU/Linux

  - by Mildred

  Here is my problem. I have a server A that has two IP addresses. One public IPv4 and one IPv6. Server B has only one IPv6 address. I want to host most of my services on server B (because I have more disk space on it, I can control it better) but I need the IPv4 of the server A. I would like to set up a 4in6 tunnel (RFC 2473) between A and B so that I can transfer the traffic from the IPv4 address in A to B. If needed, I can request another IPv4 address on the server A, but I'd prefer not to. My question is: which software use to do the 4in6 tunnelling? I suppose OpenVPN can do the thing, but is there any implementation of the 4in6 protocol on Linux? A little more challenging: the IPv4 address comes from a venet interface, which cannot be bridged. How could I transfer ownership of this address I don't use on server A to the server B? Thank you

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• How to get started with tcp/ip v6?

  - by Johan

  Hi Now and then there is "news" about that the ip numbers will run out in X years, and we must change to tcp/ip v6... And even thou this crisis never really happens it has waken a question, how do you get started with tcp/ip v6? What can I do at home and is this a good or bad idea? Can you use IPv4 and IPv6 in the same cables in the same LAN, or do you need to physically separate them? Can you have some translation box so you can reach the "normal" internet from the IPv6 connected devices? (Just like a NAT-Router) Can someone please clarify the situation a little bit? Thanks Johan

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• Teredo - how to connect to host behind NAT?

  - by Signum

  All I want to achieve is to establish connection to my simple server (written in C# using TcpListener class, if it makes any difference), on my computer which is behind NAT. It has some IPv6 address (it's public IP, starting with 2001:0) on Teredo interface. However, I cannot even ping it from outside my network, for instance I'm trying to ping this address from this website http://mebsd.com/ipv6-ping-and-traceroute, result - 100% packet loss. As I understood from reading about Teredo, there is no need for some port forwarding? So where could be the problem?

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• Why do I get "General Failure" when pinging host name on a Win 7 node on the network?

  - by hydroparadise

  This is a very peculiar problem with a station on our network. The client pc is running Windows 7 Pro. What makes this problem interesting is that this client is the only node on the network that seems to be experiencing this proglem. When I try to ping a specific Win 08 server by host name, I get an IPv6 address and get General failure. But when I ping it's IPv4 address, it responds just fine. My first thought would check the DNS server the name resolutions to see what would be going on, but the problem begs the quesion, why does the station get an IPv6 address back and fails as opposed to using the IPv4 settings (which are static btw). What gives? I am including a screen shot of trying the one specific server and failing while trying another server with success. All other nodes on the network don't have problems communicating with the server the one station is having issues with.

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• "Warning: hostname localhost does not resolve to address ::1: No address associated with hostname" inside an openVZ/Debian container

  - by frlan

  I'm getting the mesage regulary inside mail.log from postfix. In special, but not only, at mails send received mailman. warning: hostname localhost does not resolve to address ::1: No address associated with hostname ::1 as well as 127.0.0.1 are defined as localhost inside /etc/hosts -- as provided by openVZ. Actually inside /etc/hosts these is configured (I removed special domains and IP for reasons): fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters 2a01::<some IPv6> host.example.org host example.org 127.0.0.1 localhost.localdomain localhost # Auto-generated hostname. Please do not remove this comment. xxx.xxx.xxx.xxx host.example.org host example.org ::1 localhost ip6-localhost ip6-loopback And this seems to work: $ host localhost localhost has address 127.0.0.1 localhost has IPv6 address ::1 On this box bley is also running.

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• apt-get : trying to resolve ipv6

  - by llazzaro

  Hello, My problem is that when I do an apt-get update is trying to resolve ipv6 ips, and its failing to update/install/etc. How to disable ipv6 at apt-get? The ping to www.google.com.ar, resolves to an ipv4. And this is debian runnung in an OpenVZ container. Thanks!

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• Host ::1 resolves to remote IP

  - by thebuckst0p

  /etc/hosts files usually have this line, ::1 localhost. I thought ::1 was the equivalent of 127.0.0.1/localhost, and from my reading it seems to be the IPv6 version. So I was using it in Apache for firewalling, "Allow from ::1" and it only allowed local. Then suddenly that stopped working, so I pinged ::1 and got a remote IP address. I tracerouted it and it went through my ISP, through some Microsoft server, then another half dozen steps of asterisks... I'm not sure why this would be (the remote IP), but it doesn't seem good. I grep'd my hard drive for the remote IP and it doesn't appear anywhere. Is this some indicator that I'm being hacked, or normal behavior? Maybe my IPv6 settings are wrong? (This is a brand new MacBookPro with Snow Leopard.) Any ideas about this would be great - what is ::1 supposed to be, why would it be remote, should I be worried, how do I get it back to localhost? Thank you!

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• Privacy, VPN and routers

  - by user123189

  Ever since this ACTA push-up the things are starting to heat up around torrents and privacy. I am using Tribler now, but this is not secure enough for me. Not enough privacy. I've been using in the past a swedish VPN PPTP connection. What I observed is that, when the VPN connection was down, Internet traffic wasn't cut off, rather the downloads were continuing, this time with my real IP, wearing off my protection. 1st : How to enforce a VPN connection that will cut all traffic when down? That is, the moment the connection is down, all internet traffic should cease as if I'd pull the network plug out. 2nd: Is PPTP good enough or should I ask for SSTP or IKEV2 ? 3rd: Should I disable IPv6 ? Is VPN no longer private if I keep IPv6 active? I 'heard some stuff' about dual vpn routers to be able to improve privacy; but nothing more about how to configure one for such a task. 4th: Is there any kind of "black box" hardware equipment that can be used in hiding IP, encrypting traffic and so on ?

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• How to configure a large mtu (linux)

  - by Somejan

  I have a gigabit ethernet connection from my laptop to my router, and a working ipv6 connection to the internet. I can receive very large packets from sites on the internet, with sizes up to at least 10000 bytes (according to wireshark). (edit: turns out to be linux's 'generic receive offload') However, when trying to send anything, my local computer fragments at just below 1500 bytes for ipv6. (On ipv4, I can send tcp packets to the internet of at least 1514 bytes, I can ping with packets up to the configured mtu of 6128 but they are blackholed.) I'm on ubuntu 12.04. I have configured an mtu for my eth0 of 6128 (the maximum it accepts), both using ip link set dev eth0 mtu 6128 and in the NetworkManager applet gui, and restarted the connection. ip link show eth0 shows the 6128 mtu is indeed set. ip -6 route shows that none of the paths the kernel knows about have an mtu set. I can ping over ipv4 with packets up to 6128 bytes (though I don't get responses), but when I do ping6 myrouter -c3 -s1500 -Mdo I get error replies from my own computer saying that the packets are too large and the mtu is 1480. I have confirmed with Wireshark that nothing is put on the wire, and the replies are indeed generated by my own computer. So, how do I get my computer to use the larger mtu?

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• OpenVPN - Cannot browse ipv4 websites

  - by user1494428

  I have set up an openVPN tunnel on my VPS (OpenVZ - Ubuntu 12.04). The problem is I can only browse websites which support ipv6 like google. http://whatismyv6.com/ reports me that I've an ipv6 adress, so I guess this is the problem. Server configuration: dev tun server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt ca /etc/openvpn/easy-rsa/keys/ca.crt cert /etc/openvpn/easy-rsa/keys/server.crt key /etc/openvpn/easy-rsa/keys/server.key dh /etc/openvpn/easy-rsa/keys/dh1024.pem push "route 10.8.0.0 255.255.255.0" push "dhcp-option DNS 8.8.8.8" push "dhcp-option DNS 8.8.4.4" push "redirect-gateway def1" comp-lzo persist-tun persist-key status openvpn-status.log log /var/log/openvpn.log verb 3 Client configuration: client remote xx.xx.xx.xx 1194 dev tun comp-lzo ca ca.crt cert client1.crt key client1.key redirect-gateway def1 verb 3 I have configured NAT with this command: iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to xx.xx.xx.xx Can someone explain me how I can make it works (forcing ipv4?) I had the same problem with another vps and I also tried on another client (All Windows 7).

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• Cannot browse ipv4 websites (OpenVPN )

  - by user1494428

  I have set up an openVPN tunnel on my VPS (OpenVZ - Ubuntu 12.04). The problem is when I'm connected to the vpn, I can only browse websites which support ipv6 like google. Ipv4 sites aren't loading (no error, just waiting indefinitely). http://whatismyv6.com/ reports me that I've an ipv6 address, so I guess this is the problem. Server configuration: dev tun server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt ca /etc/openvpn/easy-rsa/keys/ca.crt cert /etc/openvpn/easy-rsa/keys/server.crt key /etc/openvpn/easy-rsa/keys/server.key dh /etc/openvpn/easy-rsa/keys/dh1024.pem push "route 10.8.0.0 255.255.255.0" push "dhcp-option DNS 8.8.8.8" push "dhcp-option DNS 8.8.4.4" push "redirect-gateway def1" comp-lzo persist-tun persist-key status openvpn-status.log log /var/log/openvpn.log verb 3 Client configuration: client remote xx.xx.xx.xx 1194 dev tun comp-lzo ca ca.crt cert client1.crt key client1.key redirect-gateway def1 verb 3 I have configured NAT with this command: iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to xx.xx.xx.xx Can someone explain me how I can make it works (forcing ipv4?) I had the same problem with another vps and I also tried on another client (All Windows 7).

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• Using u32 together with extension headers (how to jump over them?)

  - by bortzmeyer

  I'm trying to filter on some parts of the payload, for an IPv6 packet with extension headers (for instance Destination Options). ip6tables works fine with conditions like --proto udp or --dport 109, even when the packet has extension headers. Netfilter clearly knows how to jump over Destination Options to find the UDP header. Now, I would like to use the u32 module to match a byte in the payload (say "I want the third byte of the payload to be 42). If the packet has no extension headers something like --u32 "48&0x0000ff00=0x2800"` (48 = 40 bytes for the IPv6 header + 8 for the UDP header) works fine, If the packet has a Destination Options, it no longer matches. I would like to write a rule that will work whether the packet has Destination Options or not. I do not find a way to tell Netfilter to parse until the UDP header (something that it is able to do, otherwise --dport 109 would not work) then to leave u32 parse the rest. I'm looking for a simple way, otherwise, as BatchyX mentions, I could write a kernel module doing what I want.

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• What would be the disadvantages/risks of using AF_UNSPEC?

  - by Kiril Kirov

  From Beej's Guide to Network programming You can force it to use IPv4 or IPv6 in the ai_family field, or leave it as AF_UNSPEC to use whatever. This is cool because your code can be IP version-agnostic. As the title says - what would be the disadvantages (or risks, if any) of always using AF_UNSPEC, instead of specifying IPv4 or IPv6? Or it's only for one reason - if the version is specified, this will guarantee that this and only this version is supported? A little background - I think about adding support for IPv6 in client-server (C++) applications and both versions should be supported. So I wondered if it's fine to use AF_UNSPEC or it's better to "recognize" the address from the string and use AF_INET6 or AF_INET, depending on the address.

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• SIP Forum, IPv6 Forum Collaborate to Promote Interoperable Standards

  Keeping these protocols non-proprietary is seen as vital to the future of VoIP and the Internet in general.

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• What is the max hostname length on Solaris 8/10? And can it be expanded?

  - by darrickc

  I found getconf HOST_NAME_MAX to return 255 on my Sol 10 box, so I'm assuming that that is the max length of a hostname in Solaris 10. Can this be expanded? What about for ipv6?

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• IPv6 address is not working in Ubuntu

  - by Alex Farber

  Telnet connection with echo service succeeds for localhost and 127.0.0.1 host names, but fails with ::1 host name: alex@u120432:~$ telnet localhost 7 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 123 123 ^] telnet q Connection closed. alex@u120432:~$ telnet ::1 7 Trying ::1... telnet: Unable to connect to remote host: Connection refused alex@u120432:~$ My own program trying to talk using IPv6 address fails as well. Why IPv6 address is rejected? OS: Ubuntu 12.04 32 bit.

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• Linux (Kubuntu 9.10): Strange DNS problem [seems to be IPv6 issue]

  - by Homer J. Simpson

  Hi, I'm experiencing strange problems with my Kubuntu 9.10 when doing DNS requests from various applications. The requests are extremely slow, so loading any pages in Firefox or Konqueror, doing package installations in Kpackagemanager and other apps is really painful, while for example Opera doesnt have any problems, and ping is normally fast as well for DNS pings. I checked the proxy settings of both the used applications as well as of the general system and there are none, so to me it doesn't seem as there was something inbetween.. Does anybody have an idea on what to check for possible problem sources or how to solve this ? I'm behind a DSL home router which does the DHCP (and works well with my other computer). Any kind of advice would be really helpful. Edit: It seems to be some kind of IPv6 problem, as I could get it to work by disabling IPv6 explicitly in Firefox. Is there a general solution to this ?

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