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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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• Configure SMTP server windows

  - by Jake

  I am configuring a local network and for some reason I can't get server to send an email. I already install the SMTP server and configured using this tutorial http://www.itsolutionskb.com/2008/11/installing-and-configuring-windows-server-2008-smtp-server/ but when I try to send an email using code, the email gets pickedup from mailroot/pickup and dropped in mailroot/queue and stays in queue forever, it never goes anywhere, I even tried dropping a basic mail.txt file with this in it: to:[email protected] from:[email protected] subject:This is a test. this is a test. still the same thing happens. Is the smtp server not configured right, is their something else I am missing, because this is my first time setting up an smtp server

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• Set Thunderbird to always reply using plain text [closed]

  - by stefan.at.wpf

  Possible Duplicate: How do I tell Thunderbird never to send (or even try to send) html emails? In the account settings of Thunderbird (version 11.0.1) I have disabled HTML and set it to compose messages as plain text. That works for new messages. However, when I get an HTML email and reply to that mail, Thunderbird uses HTML. I went to the setting in: Tools ? Options ? Composition ? Send Options ? Plain Text Domains And have tried *.* as the domain name. I also changed the default text format in Settings - Compose - Send options. Neither of them works, the reply is still using HTML (for my own text). How can I really reply in plain text only, regardless of incoming?

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• Firewall Deep Inspection Updates and Antivirus Subscription, worth it?

  - by msemack

  I realize that this is a subjective question, but I'm trying to get some experiences We have Juniper firewalls in our organization (SSG-320M, SSG-5, and some old NS-5GT). We have the option of a yearly subscription for: Deep Inspection Signature Updates Juniper-Kaspersky Antivirus I seem similar services available from other Firewall vendors. We have Symantec Endpoint Protection deployed to all workstations and servers, plus a dedicated appliance for e-mail spam/virus filtering. So, I'm not sure what these firewall-base services will bring to the table that I don't already have. I would appreciate some feedback from people using these firewall services (Juniper or otherwise). Are these services generally worth it? Do they really catch anything? Do they interfere with normal traffic (false positives)?

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• Network and log monitoring and vulnerability scanning

  - by user137799

  I am trying to find out if there is any application or service in UNIX that will - 1. Monitor network interfaces for bandwidth usage 2. When network flaps occur send out a e-mail. 3. When duplicate mac-addresses or loop occurs in network - send out alerts. 4. Do a network vulnerability scan and be able to detect utorrent application on our network. Need to know which linux distribution will be best to support that specific application Thanks

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• Can qmail-ldap replace the validrcptto file?

  - by T. Fabre

  We are using qmail to route incoming mail to our Domino server. However, that requires us to maintain the validrcptto with the list of all allowed email addresses. Since Domino provides an LDAP directory, does qmail-ldap provide functionnality to lookup valid rcpt to addresses in the Domino directory instead of the validrcptto file, so that we wouldn't have to maintain that extra list ? We have about 150~200 users, so is setting up qmail-ldap worth the extra mile if it can verify addresses in the LDAP directory ? If anyone has experience with qmail-ldap and its setup, I'd be glad to hear from you.

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• SMTP Server Issue in intersystem cache

  - by nayanak

  I am facing an issue when I am sending Email from intersystems cache. I am able to send the mail, with out any problem the first time. But the second time when I am trying to send the smtp server is not responding properly. The first Helo command is sent. I recieve the confirmation 220 from the server. But I do not recieve the Message 250. So the next command is giving me the error 503, 5.5.2 "Send helo first" message. I am unable to find out why the server is not responding the second time.

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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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• 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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• Can send to individual users but not when they are in a global distribution list.

  - by Jake

  I am able to send email to individual users but when not when they are in a distribution group. When I do I get this report. The message could not be delivered because the recipient's destination email system is unknown or invalid. Please check the address and try again, or contact your system administrator to verify connectivity to the email system of the recipient. #5.3.1 However, like I said before I can select their name from the GAL and send mail that way. Their email address is exactly the same in both the GAL and distribution group. The only difference is these users have external email addresses. Windows Server 2003 Exchange Server 2003 Outlook 2007 and 2010.

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• Very slow accessing printer shared from Windows Machine

  - by Tarski

  Hello, How do I go about debugging a networking problem where the office printer is shared off a Windows XP PC and is very slow from me to access? Print/changing any settings can take several minutes and applications often display "Not Responding" in this time. My machine is a Windows Vista PC. The other PCs in the office are either Vista or XP and do not suffer from any printing problems. I am not experiencing any other network related problems, I can access the web and e-mail fine. The printer is a HP officejet Pro 8000

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• deploying skype for 50 nationwide users with preset usernames

  - by kevyn

  Is there a way to sign up a large group of skype names at once? is there a way to enable the users to be given a skype username based on their own e-mail addresses? What I would like to do is roll out skype in an office in every county in UK with a pre defined username such as 'mycompanyname-warwickshire', 'mycompanyname-bedfordshire' and so on. Our users are only basic computer users, so I would ideally like this done with as least fuss as possible for them! Thanks in advance ps. if anyone has a good way of doing this by using any alternative software, I'm open to suggestions

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• Is anyone familiar with this message in Kapersky Internet Security 2010?

  - by tintincutes

  Hi I just started my computer up & opened a website for my checking my mail, when I opened a Kaspersky Internet Security 2010 window popped up. C:\Documents and Settings\username\Local Settings\Application Data\Mozilla\Firefox\Profiles\rse47wp8.default\Cache\C\79\D5CC9d01 Does anyone is familiar with this? I checked the path and this path doesn't exist. I couldn't remember that I have a file of D5CC9d01 once. Can somebody please tell me if this is a virus or not? Thanks

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• Feeding the kernels entropy source from other machines and/or increasing its maximum size

  - by David Spillett

  We have has a little trouble with a small box that acts as a VPN end-point and mail relay for our network, caused by the available entropy for /dev/random being too low (which causes TLS connection attempts by exim to fail). The machine doesn't do anything else, so the normal feed into the entropy pool (interrupt timings from things like disk access) is not enough. As a quick hack I've set a looping script that reads from /dev/hda at a couple of Mbyte/sec which keeps it topped up. Other than buying a hardware RNG, is there a clean way of piping data for entry from elsewhere, such as a copy of the data our file server uses for its entropy source? I've spotted several tips for using rng-tools to feed it from /dev/urandom on the same machine but that "feels dirty". Also, is it possible to increase the maximum pool size? It currently seems to max out at 3585.

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• Why does m4 error "linux-gnu.m4 - No such file or directory" appear the first time after updating sendmail.mc?

  - by Mike B

  SendMail 8.14.x | CentOS 5.x I've noticed that if I manually update /etc/mail/sendmail.mc (for example, enable TLS support), and then bounce sendmail, I get the following error: Shutting down sm-client: [ OK ] Shutting down sendmail: [ OK ] Starting sendmail: sendmail.mc:18: m4: cannot open `/usr/share/sendmail-cf/ostype/linux-gnu.mf': No such file or directory [ OK ] Starting sm-client: [ OK ] This only happens one time after I update a sendmail.mc file. If I bounce sendmail again (without making any other change), I don't see the error any more. Any idea why this happens? It doesn't cause any errors - I'm just curious.

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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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• In CentOS 4.3 Webmin 1.3000 bandwidth monitoring is eating disk space. How to delete those files?

  - by Silkograph

  I maintain Linux server being used for Mail, Squid and DNS service. Recently I observed that something was eating server disk space. But at last, today I caught the culprit which was consuming the disk by storing large number of files. On this server, Webmin 1.300 is installed. We use Squid proxy and Sarg to monitor Internet access. I always manually clear Sarg generated files under /var/www/html/squid for last few years. But I never realized that Webmin is also storing some kind of bandwidth log files in its' directory structure. I have noticed that under /etc/webmin/bandwidth/hours it has stored more thousands of files since year 2007 totaling about 17 GB. We have used 40 GB HDD for this server machine. My question is how can I delete those (/etc/webmin/bandwidth/hours) files safely?

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• Authentication issues setting up iRedMail on Debian

  - by Sergio Rinaudo

  I'm setting up an exchange server using iRedMail. Following the official iRedMail installation guide (http://www.iredmail.org/install_iredmail_on_debian.html) and the Digital Ocean guide (https://www.digitalocean.com/community/articles/how-to-install-iredmail-on-ubuntu-12-04-x64) I was able to install iRedMail without any problems, so I have all the services up and running. I can configure domains and emails using iRedAdmin BUT I have problem both sending and receiving email, what I get from Roundcube is 'Authentication error' when trying to send an email. Also I can't receive anything. I also tried to connect to the mx server using telnet, it connects, but after the STARTTLS command, when I start to write "MAIL FROM:" the connection is lost. Something in the configuration is not working (at the moment I have the configuration written by the iRedMail installation) but I do not know where, I hope someone can enlight me! Thank you

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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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• How can I VPN into a domain and act as if it is local?

  - by Duall

  I've looked and looked and the internet seems to have finally failed me, there's no information on my specific issue. I have two locations, and one server (sbs 2008); I need them to act like one physical LAN. I know it's possible, I just know how to set it up, or anything about VPNs, etc. So, just to clarify a bit more: 1 Small Business Server 2008 ~30 Computers with varying systems from Windows XP to 7 2 Physical Locations I use redirected folders, but since that would consume a lot of bandwith over VPN, I have a machine over there that can be the workhorse for storage. Users need to access e-mail and shared databases from this server (or possibly some form of DFS with aforementioned workhorse) from the other building. Is there a nice tutorial (or I nice person that wants to write it) online that can explain how to set up computers from an external network to act like they were in the LAN?

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• Lots of spambot registrations on PHPBB forum

  - by Dreamdealer

  We have a PHPBB forum running for a few years with admin approval of newly registred users. New users can not post on the forum untill we approve their new account. So I get an e-mail for every new registration, and sometimes there are spambot registrations amongst them. But untill yesterday this was only a few a year, but overnight I got 32 (!) new registrations and they keep rolling in every 15 minutes or so. I run the latest PHPBB version and spambot countermeasures are on. We first had the ReCaptcha option, but that didn't work well. Then we changed it to a Q&A version and that worked. I changed the question an hour ago, but the new spam registrations keep happening, whatever I do. Help!

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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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• 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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• I added some options to stop spam with Postfix, but now won't send email to remote domains

  - by willdanceforfun

  I had a working Postfix server, but added a few lines to my main.cf in a hope to block some common spam. Those lines I added were: smtpd_helo_required = yes smtpd_recipient_restrictions = reject_invalid_hostname, reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_rbl_client multi.uribl.com, reject_rbl_client dsn.rfc-ignorant.org, reject_rbl_client dul.dnsbl.sorbs.net, reject_rbl_client list.dsbl.org, reject_rbl_client sbl-xbl.spamhaus.org, reject_rbl_client bl.spamcop.net, reject_rbl_client dnsbl.sorbs.net, reject_rbl_client cbl.abuseat.org, reject_rbl_client ix.dnsbl.manitu.net, reject_rbl_client combined.rbl.msrbl.net, reject_rbl_client rabl.nuclearelephant.com, permit It appears my postfix is now receiving normal emails fine, and blocking spam emails. But when I now try to use this server myself to send to a remote domain (an email not on my server) I get bounced, with maillog saying something like this: Nov 12 06:19:36 srv postfix/smtpd[11756]: NOQUEUE: reject: RCPT from unknown[xx.xx.x.xxx]: 450 4.1.2 <[email protected]>: Recipient address rejected: Domain not found; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<[192.168.1.100]> Is that saying 'domain not found' for gmail.com? Why is that recipient address rejected? An output of my postconf-n is: alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases broken_sasl_auth_clients = yes command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 2 html_directory = no inet_interfaces = all inet_protocols = all mail_owner = postfix mailbox_size_limit = 0 mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain mydomain = primarydomain.net myhostname = mail.primarydomain.net myorigin = $myhostname newaliases_path = /usr/bin/newaliases.postfix queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES relay_domains = $mydestination, primarydomain.net, secondarydomain.org sample_directory = /usr/share/doc/postfix-2.6.6/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtpd_client_restrictions = permit_sasl_authenticated smtpd_helo_required = yes smtpd_recipient_restrictions = reject_invalid_hostname, reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_rbl_client multi.uribl.com, reject_rbl_client dsn.rfc-ignorant.org, reject_rbl_client dul.dnsbl.sorbs.net, reject_rbl_client list.dsbl.org, reject_rbl_client sbl-xbl.spamhaus.org, reject_rbl_client bl.spamcop.net, reject_rbl_client dnsbl.sorbs.net, reject_rbl_client cbl.abuseat.org, reject_rbl_client ix.dnsbl.manitu.net, reject_rbl_client combined.rbl.msrbl.net, reject_rbl_client rabl.nuclearelephant.com, permit smtpd_sasl_auth_enable = yes smtpd_sasl_path = private/auth smtpd_sasl_type = dovecot smtpd_sender_restrictions = reject_unknown_sender_domain soft_bounce = no unknown_local_recipient_reject_code = 550 virtual_alias_domains = mail.secondarydomain.org virtual_alias_maps = hash:/etc/postfix/virtual Any insight greatly appreciated. Edit: here is the dig mx gmail.com from the server: ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6_4.4 <<>> mx gmail.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31766 ;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 4, ADDITIONAL: 14 ;; QUESTION SECTION: ;gmail.com. IN MX ;; ANSWER SECTION: gmail.com. 1207 IN MX 5 gmail-smtp-in.l.google.com. gmail.com. 1207 IN MX 30 alt3.gmail-smtp-in.l.google.com. gmail.com. 1207 IN MX 20 alt2.gmail-smtp-in.l.google.com. gmail.com. 1207 IN MX 40 alt4.gmail-smtp-in.l.google.com. gmail.com. 1207 IN MX 10 alt1.gmail-smtp-in.l.google.com. ;; AUTHORITY SECTION: gmail.com. 109168 IN NS ns1.google.com. gmail.com. 109168 IN NS ns4.google.com. gmail.com. 109168 IN NS ns3.google.com. gmail.com. 109168 IN NS ns2.google.com. ;; ADDITIONAL SECTION: alt1.gmail-smtp-in.l.google.com. 207 IN A 173.194.70.27 alt1.gmail-smtp-in.l.google.com. 248 IN AAAA 2a00:1450:4001:c02::1b gmail-smtp-in.l.google.com. 200 IN A 173.194.67.26 gmail-smtp-in.l.google.com. 248 IN AAAA 2a00:1450:400c:c05::1b alt3.gmail-smtp-in.l.google.com. 207 IN A 74.125.143.27 alt3.gmail-smtp-in.l.google.com. 249 IN AAAA 2a00:1450:400c:c05::1b alt2.gmail-smtp-in.l.google.com. 207 IN A 173.194.69.27 alt2.gmail-smtp-in.l.google.com. 248 IN AAAA 2a00:1450:4008:c01::1b alt4.gmail-smtp-in.l.google.com. 207 IN A 173.194.79.27 alt4.gmail-smtp-in.l.google.com. 249 IN AAAA 2607:f8b0:400e:c01::1a ns2.google.com. 281970 IN A 216.239.34.10 ns3.google.com. 281970 IN A 216.239.36.10 ns4.google.com. 281970 IN A 216.239.38.10 ns1.google.com. 281970 IN A 216.239.32.10

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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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