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• Frequent connection drops when playing online games (StarCraft 2, Battlefield 3) and behind NAT - how to diagnose?

  - by Moshev

  I am having some trouble with (I suspect) my wireless router. It's connected to the internet with a regular lan cable and has a static, public IP address. Our two home PCs connect to the router with regular lan cables, plus there's a laptop which connects over wifi. diagram: Internet | | <- isp-supplied cat5 ethernet cable | D-Link D300 ...wifi... laptop / \ / <- cable -> \ PC1 PC2 The PCs and laptop are behind NAT and share the router's public IP. The router is a D-Link D300. PC1 is used for online gaming and I'm experiencing frequent "connection dropped" errors when playing Battlefield 3, StarCraft 2 and the Diablo 3 beta; but not with TeamFortress 2 or the Tribes Ascend beta. The issue goes away when I remove the router and connect PC1 directly to the ISP's cable. I have also tried disconnecting PC2 and the laptop, leaving PC1 as the only machine connected to the router - doesn't help. How can I diagnose what precisely the issue is?

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• OpenVPN Chaining

  - by noderunner

  I'm trying to set up an OpenVPN "chain", similar to what is described here. I have two separate networks, A and B. Each network has an OpenVPN server using a standard "road warrior" or "client/server" approach. A client can connect to either one for access to the hosts/services on that respective network. But server A and B are also connected to each other. The servers on each network have a "site-to-site" connection between the two. What I'm trying to accomplish, is the ability to connect to network A as a client, and then make connections with hosts on network B. I'm using tun/routing for all of the VPN connections. The "chain" looks something like this: [Client] --- [Server A] --- [Server A] --- [Server B] --- [Server B] --- [Host B] (tun0) (tun0) (tun1) (tun0) (eth0) (eth0) The whole idea is that server A should route traffic destined to network B through the "site-to-site" VPN set up on tun1 when a client from tun0 tries to connect. I did this simply by setting up two connection profiles on server A. One profile is a standard server config running on tun0, defining a virtual client network, IP address pool, pushing routes, etc. The other is a client connection to Server B running on tun1. With ip_forwarding enabled, I then simply added a "push route" to the clients advertising a route to network B. On server A, this seems to work when I look at tcpdump output. If I connect as a client, and then ping a host on network B, I can see the traffic getting passed from tun0 to tun1 on Server A: tcpdump -nSi tun1 icmp The weird thing is that I don't see Server B receiving that traffic through the tunnel. It's as if Server A is sending it through the site-to-site connection like it should, but server B is completely ignoring it. When I look for the traffic on Server B, it simply isn't there. A ping from Server A -- Host B works fine. But a ping from a client connected to Server A to host B does not. I'm wondering if Server B is ignoring the traffic because the source IP does not match the client IP pool that it hands out to clients? Does anyone know if I need to do something on Server B in order for it to see the traffic? This is a complicated problem to explain, so thanks if you stuck with me this far.

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• Get OpenVPN clients names to resolve through dnsmasq

  - by Fake Name

  I have a PFSense box running as an OpenVPN server. There are several remote devices that connect through the VPN (as tap devices). The VPN stuff is working, I can access the remote hardware by looking up the IP assigned to each device on the PFSense router. What I'd like is to have it so I can resolve the remote hardware addresses via DNS while on the local network. Note that this is only local-network - remote-device (they're backup boxes). I don't need to have the remote devices resolve using the local DNS forwarding agent. I have the rest of the devices on the network that need to be accessible via DNS report their name during the DHCP process. However, the IP assignment for OpenVPN tap clients, while it is dynamic (which is why I need DNS), does not seem to use the local DHCP server. How can I have my openvpn server add information for it's clients to the dnsmask resolver? Is this setup even reasonable (I'm not familiar with openVPN at all)?

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• Citrix Xen VM's lose networking

  - by Ash

  My client has a XenServer 6.0.2 installation with 2 Window Server 2008 R2 virtual machines. Whenever the virtual machines are rebooted they lose their IP settings (IP address, subnet, gateway). Each time after a reboot I need to login to each VM via XenCenter and re-apply the required static IP settings. This causes issues with connected iSCSI drives within each VM - drives need to be reconnected after each reboot. For example, a network adapter has the following settings pre-reboot: Description . . . . . . . . . . . : Citrix PV Ethernet Adapter #0 Physical Address. . . . . . . . . : C6-FB-A2-4F-2C-F3 IPv4 Address. . . . . . . . . . . : 10.101.0.101(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 10.101.0.10 DNS Servers . . . . . . . . . . . : 10.101.0.100 NetBIOS over Tcpip. . . . . . . . : Enabled Post-reboot: Description . . . . . . . . . . . : Citrix PV Ethernet Adapter #0 Physical Address. . . . . . . . . : C6-FB-A2-4F-2C-F3 Autoconfiguration IPv4 Address. . : 169.254.153.174(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . . . . : DNS Servers . . . . . . . . . . . : 10.101.0.100 NetBIOS over Tcpip. . . . . . . . : Enabled Under XenCenter -- Virtual Network Interfaces, each adapter is set to a static MAC address (i.e. "Use this MAC address"). I have tried the following commands within one VM but this had no effect: netsh winsock reset catalog netsh int ip reset Can someone please help?

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• Is IPv6 multicast routable over the Internet?

  - by Absolom

  As I understand it, public IPv6 addresses allocated by the IANA will have the prefix 2000::/3. These ip addresses will be routable through the Internet. IPv6 multicast addresses on the other side are prefixed FF00::/8. So my understanding is that the ipv6 multicast addresses won't be routable through the internet. I am right? If so, is there any way to do one-to-many ip routing over the Internet in IPv6? Thanks!

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• Allow connection to certain port from specified domain

  - by Scott

  I got two domains, which are pointing on the same IP address, I can use both to connect to the server or certain port (TeamSpeak), the problem is that I would like the only one domain from those two to be working while connecting to a certain port. Eg. example.com points at the 11.22.33.44 -- allow connection to the certain port from this domain. sample.com points at the 11.22.33.44 -- disallow connection to the port specified above from this domain. I know this would be possible for the IP addresses, but would it be possible for the domains?

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• Linux periodically "losing" ability to connect to server via SSH?

  - by gct

  I know this isn't exactly a programming question, but it popped up in my use of git for programming projects at least. I've got a web server that I use to host my git repos on, but my ubuntu box seems to "lose" the ability to connect to it via SSH. I'll get a "connection refused" error when I try to ssh or use git. Rebooting my local machine will fix the problem, but only temporarily. I can still connect to the web interface just fine, and the problem manifests with other servers as well. I've been working around it by pulling my changes over to my laptop and pushing from there, but that's sub-optimal as you can imagine. Has anyone seen something like this? I'd be tempted to say it's some kind of IP caching problem, but I can't connect even using the IP address of the server directly... Running Ubuntu 9.04

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• Mac Snow Leopard Server DNS

  - by panomedia

  I have a Tomcat-driven application on my Windows server that I am planning to move to a MacMiniServer. Before I do this, I want to fully test the transition for licensing purposes. I have a Fire drive setup with Snow Leopard Server and the base app runs just fine BUT I need to be able to resolve the URL to my domain and not localhost. So, I figured I would setup panomedia.net in the DNS Server and also create an A record to my internal network IP so www.panomedia.net would dish out the same thing as localhost. The problem is: The Tomcat web app starts up going through panomedia.local and not through www.panomedia.net and My main network preference panel is still looking at my Comcast DNS search providers even though I put my local IP address as the only DNS Server and Search provider. I need to test this via an actual domain name before I commit to a 400GB data move. Can anyone help?

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• Load balanced proxies to avoid an API request limit

  - by ClickClickClick

  There is a certain API out there which limits the number of requests per day per IP. My plan is to create a bunch of EC2 instances with elastic IPs to sidestep the limitation. I'm familiar with EC2 and am just interested in the configuration of the proxies and a software load balancer. I think I want to run a simple TCP Proxy on each instance and a software load balancer on the machine I will be requesting from. Something that allows the following to return a response from a different IP (round robin, availability, doesn't really matter..) eg. curl http://www.bbc.co.uk -x http://myproxyloadbalancer:port Could anyone recommend a combination of software or even a link to an article that details a pleasing way to pull it off? (My client won't be curl but is proxy aware.. I'll be making the requests from a Ruby script..)

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• What should I do about SQL connections that is a Head Blocker?

  - by MartinHN

  I'm looking at the Activity Monitor in SQL Server 2008 Management Studio. I see that a lot of processes indicates that it is a blocking process, by the value of 1 in the Head Blocker column. Is this normal, or am I potentially dealing with an issue here?

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• cannot using internet in VMWare

  - by user66247

  I am using VMware Workstation version 7 on Ubuntu 10.10. I installed Windows XP service pack 3 for guest os. Within VMWare, I am using bridge connection that I assigned static IP address to be able to ping host IP address but I cannot ping default router gateway. I also tried to command "/etc/init.d/vmware start" on terminal. All tasks are able to start successfully except "VM communication interface socket family" I am not sure that how to setup network for my VMWare by using wireless. Thanks in advance.

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• Fully Qualified Domain name on Ubuntu Server

  - by Fazal

  I've setup a LAMP server on Ubuntu 10.04 (lucid) and have also installed Virtualmin. This is my first attempt at setting up a server of any sort. I set up one virtual host using Virtualmin and so far so good. Some odd things are happening though, such as when I type in my primary domain into a browser, I see the contents of the virtual server instead of what should be in the default directory. I'm going to use 123.345.789 and example.co.uk instead of my actual ip and domain name's if thats ok. I checked my hostname by using hostname -f and got production1 as my response The contents of my /etc/hosts file is (ip's and domain changed to something generic for this post): 127.0.0.1 localhost localhost.localdomain 123.456.789 production1.example.co.uk 123.456.789 production1 shouldn't my FQD be production1.example.co.uk? How can I go about changing this?, a simple step by step instruction would be great! thanks in advance.

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• macports apache,php,db, how do I test on another device?

  - by brokenindexfinger

  My supervisor suggests using macports to install/manage different versions of apache and php, as well as both mysql and posgres databases. The idea is that we need to test our platform on different versions of each. So far I've just been using the default apache installation on osx lion, and the default postgres installation. My question is this: once I turn Web Sharing off, and proceed with a custom apache2 setup based in /opt/local/, how do I broadcast my machine's IP to other devices, for testing? With Web Sharing, I can get my machine's IP and use that to test with an iPad and iPhone. Will that still be the case, and if so, how do I do it?

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• Can't access phpMyAdmin because of host, username and password

  - by Engprof

  everyone. When I try to access phpMyAdmin on Uniform Server I get the following error messages: " #1045 - Access denied for user 'root'@'localhost' (using password: YES) " " phpMyAdmin tried to connect to the MySQL server, and the server rejected the connection. You should check the host, username and password in your configuration and make sure that they correspond to the information given by the administrator of the MySQL server. " The funny thing is my username and password are both set to "root" and I have changed the IP address in the httpd.conf file to my Unique IP adddress, so I still don't know what the problem is. Could somebody please help me out? Any help would be much appreciated.

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• Windows 7 system CPU bogged by windows services, no explanation

  - by Alex

  I'm looking at a laptop for a colleague which is running terribly slow. A quick look showed that the CPU was 100% used by 2-3 SVCHost processes, which off course doesn't tell much since those are just 'cover' processes with services running underneath them. So I fired up process explorer in hopes of finding a shady rogue service which was bogging the system, but to my suprise I found genuine MS Windows processes (or at least damn-good disguised ones) are bogging down the system: dnscache (DNS Client) IKEEXT (IKE and AuthIP IPSec Keyring modules) iphlpsvc (IP Helper) Seen separately, these processes might seem odd to be using a lot of CPU, but taking a step back one can conclude that all three services are quite closely related to networking. I've tried running: netsh int ip reset log.txt which has helped me save bizarre network-related problems in the past, but this didn't help Off course I though about a virus, but both MS Security Essentials as well as malwarebytes (let both run a full scan).

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• software to view logs on remote server

  - by Tarun

  I have configured syslog server on my linux machine like this Linux Machine (syslog client) -- Linux Machine (syslog server) I have configured it and its working properly. Now, the problem is I want to look at the logs located on remote server in a particular directory for example /var/log/host-ip/httpd.log. One way is that I use ssh for that and then see those logs using commands like tail etc. So is there any Browser based graphical utility which I can use on my machine in which I just give the remote folder location, ip-address etc. and the software shows me the logs present on that remote server. Thanks.

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• Asterisk is hacking itself [duplicate]

  - by Shirker

  This question already has an answer here: How do I deal with a compromised server? 11 answers I've got some strange logs on my asterisk (and there a lot of extensions were tried): chan_sip.c: Failed to authenticate device 6006<sip:[email protected]>;tag=f106f3fe but IP XX.XX.XX.39 is its OWN IP! cat /etc/asterisk/* | grep 6006 returns nothing. asterisk -rv Asterisk 11.4.0 How its possible, that its hacks itself? And how could I trace, where it comes from?

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• Turn on PC power remotely through the Internet?

  - by W.N.

  I use SVN for my work at home and office, but I usually forget to commit the changes before shutdown. Therefore, I wish I could turn on my home/office PC at office/home. I already have TeamViewer installed on both PCs, so it will be okay as soon as the power is turned on. I have read many articles about this, I found both my PC and office computers support Wake-on-LAN. However, I don't know much about other config. And I need to turn on my computers through the Internet, not on LAN. My office Internet connection has static IP, however, my home Internet connection has dynamic IP, it changes as soon as I reset the modem, but it is not a big problem, I rarely turn the Internet modem off. And I don't have privilege to config office Internet connection, but I have Administration privilege on both PCs. Please give me details steps to turn on my office PC from home, and turn on my home PC from office.

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• Monitor torrent user in network [closed]

  - by Usman

  I am using active directory in windows server 2008 R2 having IP address is 10.10.10.10 and my DSL modem Ip is 10.10.10.101. All clients are using 10.10.10.101 default gw to access the Internet. I don't know who is using Torrent in network or downloading something via IDM or something else. I just want to Monitor my clients for who are download via torrent or whatever. Is there anything in Windows Server 2008r2 that would allow me to do this monitoring, or do I need something else?

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• Postgres Remote Access

  - by boot-baby-boot

  I am trying to connect to postgres remotely.I have followed this tutorial http://www.cyberciti.biz/faq/howto-fedora-linux-install-postgresql-server/ and have executed the following commands to see if the remote access is possible. [root@printmyworld ~]# egrep -i "(listen_addresses|port|tcpip_socket).*=.+" /var /lib/pgsql/data/postgresql.conf #listen_addresses = '*' # what IP address(es) to listen on; #port = 5432 [root@printmyworld ~]# lsof +c0 -anPiTCP -upostgres COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME postmaster 9323 postgres 3u IPv4 2875987353 TCP 127.0.0.1:5432 (LISTEN ) postmaster 9323 postgres 4u IPv6 2875987354 TCP [::1]:5432 (LISTEN) I am suspicious of this line: postmaster 9323 postgres 3u IPv4 2875987353 TCP 127.0.0.1:5432 (LISTEN My server ip address is 1yy.000.1xx.000 .Should it be 1yy.000.1xx.000:5432

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• is using Hosts for resolving a sql-server more performant?

  - by Ice

  Hi, we have a legacy application which uses a access.mdb with hundreds of ODBC-connected tables on a sql-server. the access.mdb contains nothing else than these odbc-connections. Now we consider to use a virtual sql-servername for these odbc connections and resolve it in the local hosts-file with the ip-address of the real sql-server. Like this we can easy switch between a test-sql-database server and the the server for production in changing one single entry in the hosts. EVERYTHING works fine and now comes the question: Could it be that this is more performant because there is one single point on resolving the sql-server (name or ip-address)? Is there something like a network-cache / DNS-Cache? peace Ice

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• IIS7 - multiple ports for websites, some working, some not.

  - by glasnt

  I have multiple IIS7 websites hanging off 1 IP, using different ports. All three sites use Z.A.B.C:XX, where XX is {100, 200, 300} * There's no web.config settings not making :300 not work, the bindings are set ok. I can even change the ports so 200 becomes 300, but the original 300 still doesn't work. They are all shown by IP, so it's not DNS. There's no SSL setting differences between them. I can't see anything in metabase.xml that would make one behave differently to another. Are there any other settings in IIS7 that I might not be finding, that would fix the issue? * not the real values.

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• Can't connect to server from certain machines

  - by Joel Coel

  On a small college campus we have a VLAN setup for the computer labs. These machines get assigned IP addresses in the 192.168.7.xxx range. In the server room, all of the server are on the default VLAN and assigned an IP address in the 10.1.1.xxx range. For the most part this works, but the lab machines are unable to connect to one of the servers. They can't even ping it. They can talk to other servers on the same switch as this server just fine. At first I thought it might be a vlan issue, but I changed the server port vlan to match other known-working ports with no effect. Any ideas?

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• connecting hostname to server

  - by Michael Ropy

  I have an ubuntu server installed on my server with virtualmin webmin. everything is good the server itself....I can connect to localhost and the virtualmin manager (http://localhost:10000). the problem is, I can't connect to it from a client computer. For example when I enter the IP address of the server, its shows me 403 forbidden error (sometimes its shows the homepage right)...but the virtualmin manager could not open... if my website is example.com with this ip: xxx.xxx.xxx.xxx, i can't connect to example.com:10000 or xxx.xxx.xxx.xxx:10000 what should I do?

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• Connection closed by remote host followed by Connection refused

  - by Khosrow

  All of a sudden my ssh connection to server has been damaged. Here is what's happened: $ ssh -vvv -p <PORT> -l <USER> <HOST> OpenSSH_5.3p1 Debian-3ubuntu7, OpenSSL 0.9.8k 25 Mar 2009 debug1: Reading configuration data /home/khosrow/.ssh/config debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to <HOST> [<IP>] port <PORT>. debug1: Connection established. debug1: identity file /home/khosrow/.ssh/identity type -1 debug1: identity file /home/khosrow/.ssh/id_rsa type -1 debug1: identity file /home/khosrow/.ssh/id_dsa type -1 ssh_exchange_identification: Connection closed by remote host I've recently updated the box with yum update and sshd got updated as well. I honestly don't know if this caused any damages or not. But it's prompted that /etc/ssh/sshd_config was stored as /etc/ssh/sshd_config.rpmnew which was quite normal. I've seen similar posts while googling, but almost all of them suggests that I should check /etc/hosts.allow and /etc/hosts.deny, which in my case, I can't. I can not connect to the box to see what's going on there. I rebooted the box, through web interface of server provider, and it even got worse. I'm now getting this: $ ssh -vvv -p <PORT> -l <USER> <HOST> OpenSSH_5.3p1 Debian-3ubuntu7, OpenSSL 0.9.8k 25 Mar 2009 debug1: Reading configuration data /home/khosrow/.ssh/config debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to <HOST> [<IP>] <PORT>. debug1: connect to address <IP> port <PORT>: Connection refused ssh: connect to host <HOST> port <PORT>: Connection refused with both <CUSTOM_PORT> and default 22 ports. I would really appreciate if anyone could help me on this.

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