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• ipv6 with KVM on debian

  - by Eliasdx

  I have trouble setting up IPV6 on my Proxmox (KVM) server: My ISP sent me this information(xxx=placeholder): IPs: 2a01:XXX:XXX:301:: /64 Gateway: 2a01:XXX:XXX:300::1 /59 This is the interface setup on the host server: auto vmbr1 iface vmbr1 inet static address 178.XX.XX.4 broadcast 178.XX.XX.63 netmask 255.255.255.192 pointopoint 178.XX.XX.1 gateway 178.XX.XX.1 bridge_ports eth0 bridge_stp off bridge_fd 0 iface vmbr1 inet6 static address 2a01:XXX:XXX:301::2 netmask 64 up ip -6 route add 2a01:XXX:XXX:300::1 dev vmbr1 down ip -6 route del 2a01:XXX:XXX:300::1 dev vmbr1 up ip -6 route add default via 2a01:XXX:XXX:300::1 dev vmbr1 down ip -6 route del default via 2a01:XXX:XXX:300::1 dev vmbr1 On the guest: auto eth0 iface eth0 inet static address 178.xx.xx.47 netmask 255.255.255.255 broadcast 178.xx.xx.63 gateway 178.xx.xx.1 pointopoint 178.xx.xx.1 iface eth0 inet6 static pre-up modprobe ipv6 address 2a01:XXX:XXX:301::2:2 netmask 64 up ip -6 route add 2a01:XXX:XXX:300::1 dev eth0 down ip -6 route del 2a01:XXX:XXX:300::1 dev eth0 up ip -6 route add default via 2a01:XXX:XXX:300::1 dev eth0 down ip -6 route del default via 2a01:XXX:XXX:300::1 dev eth0 Ipv4 works on both host and guest but Ipv6 only works "sometimes". It's up for minutes and then down again until I change something. However I can actually ping the host and the guest from both host and guest. host:~# ip -6 neigh 2a01:XXX:XXX:301::100:2 dev vmbr1 lladdr 00:50:56:00:00:e0 REACHABLE 2a01:XXX:XXX:300::1 dev vmbr1 lladdr 00:26:88:76:18:18 router STALE host:~# ip -6 route 2a01:XXX:XXX:300::1 dev vmbr1 metric 1024 mtu 1500 advmss 1440 hoplimit 4294967295 2a01:XXX:XXX:301::/64 dev vmbr1 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev vmbr0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev vmbr1 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev tap101i1d0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 default via 2a01:XXX:XXX:300::1 dev vmbr1 metric 1024 mtu 1500 advmss 1440 hoplimit 4294967295 Does someone know why it isn't working? And is there a way to configure multiple v6 IPs from the same subnet so I can dedicate IPs to websites on a server with multiple virtualhosts?

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• Access server using IP on another interface

  - by Markos

  I am using Windows Server 2012 instead of a router for my home network. Currently I am using RRAS and computers from local network can access Internet correctly. Here is a map of the current setup: [PC1] ---| |---- (lan ip)[Server](wan ip)--> internet [PC2] ---| I have applications running on Server, such as IIS and others. All can be accessed from internet using wan ip and from lan using lan ip. I have a domain, lets say its my-domain.com, which is resolved to my wan ip. What I want is to enable my LAN computers to be able to connect to services on my server using the very same address as internet users: eg http://my-domain.com/. However this does not work for my lan computers. What I understand is that I need to set up some kind of loopback route in a way that packets comming to LAN interface get routed to WAN interface. But I haven't found how to achieve this (in fact, I don't know WHAT to search for). Feel free to ask for additional informations and I will try to update the question.

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• Cherrypy web application won't communicate outside localhost via VPN

  - by Geoffrey Shea

  I'm trying to run a Python2.7/Cherrypy web server on Win 7 which is connected to a VPN to establish a dedicate IP address. (If I run the exact same application on Win XP connected to the VPN it works fine.) On Win 7 I tried configuring it to use port 8080, 8005, or 80 with no improvements. I turned off Windows Firewall altogether to test and there was no improvement. If I run Apache on the Win 7 machine on port 80 it works fine so I'm pretty sure it's not the VPN service or router. If I go to WhatismyIP.com it shows that I have the IP address being provided by the VPN. Here is the Python code, but I suspect the problem is the network configuration: import cherrypy class HelloWorld: def index(self): return "Hello world!3" index.exposed = True cherrypy.root = HelloWorld() cherrypy.config.update({"global":{ "server.environment": "production", "server.socketPort": 8005 } }) cherrypy.server.start() This will return a web page if I go to localhost:8005, but not if I go to the VPN IP address:8005 from another machine. As I said, if I run Apache on the Win 7 machine on port 80 I can see it at localhost:80 AND at the VPN IP address:80 from another machine. Thanks for any light you can shed! Geoffrey

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• Route return traffic to correct gateway depending on service

  - by Marnix van Valen

  On my office network I have two internet connections and one CentOS server running a website (HTTPS on port 443). The website should be publicly accessible through the public IP of the first internet connection (ISP-1). The other internet connection, ISP-2, id the default gateway on the network. Both internet connections have routers (the household-kind) with NAT, SPI firewalls etc. The router on ISP-2 is a Netgear WNDR3700 (aka N600) with original firmware. The problem is that the website is unreachable. Looks like incoming traffic on ISP-1 will reach the server but the returning traffic is routed through ISP-2, effectively making the site unreachable. As far as I can tell I can't do port based routing on the WNDR3700. What are my options to make this work? I've been looking at implementing an iptables / routing based solution on the server itself but haven't been able to make that work. Update: Note that the server has one network interface connecting it to both routers.

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• ipv6 with KVM on debian

  - by Eliasdx

  I have trouble setting up IPV6 on my Proxmox (KVM) server: My ISP sent me this information(xxx=placeholder): IPs: 2a01:XXX:XXX:301:: /64 Gateway: 2a01:XXX:XXX:300::1 /59 This is the interface setup on the host server: auto vmbr1 iface vmbr1 inet static address 178.XX.XX.4 broadcast 178.XX.XX.63 netmask 255.255.255.192 pointopoint 178.XX.XX.1 gateway 178.XX.XX.1 bridge_ports eth0 bridge_stp off bridge_fd 0 iface vmbr1 inet6 static address 2a01:XXX:XXX:301::2 netmask 64 up ip -6 route add 2a01:XXX:XXX:300::1 dev vmbr1 down ip -6 route del 2a01:XXX:XXX:300::1 dev vmbr1 up ip -6 route add default via 2a01:XXX:XXX:300::1 dev vmbr1 down ip -6 route del default via 2a01:XXX:XXX:300::1 dev vmbr1 On the guest: auto eth0 iface eth0 inet static address 178.xx.xx.47 netmask 255.255.255.255 broadcast 178.xx.xx.63 gateway 178.xx.xx.1 pointopoint 178.xx.xx.1 iface eth0 inet6 static pre-up modprobe ipv6 address 2a01:XXX:XXX:301::2:2 netmask 64 up ip -6 route add 2a01:XXX:XXX:300::1 dev eth0 down ip -6 route del 2a01:XXX:XXX:300::1 dev eth0 up ip -6 route add default via 2a01:XXX:XXX:300::1 dev eth0 down ip -6 route del default via 2a01:XXX:XXX:300::1 dev eth0 Ipv4 works on both host and guest but Ipv6 only works "sometimes". It's up for minutes and then down again until I change something. However I can actually ping the host and the guest from both host and guest. host:~# ip -6 neigh 2a01:XXX:XXX:301::100:2 dev vmbr1 lladdr 00:50:56:00:00:e0 REACHABLE 2a01:XXX:XXX:300::1 dev vmbr1 lladdr 00:26:88:76:18:18 router STALE host:~# ip -6 route 2a01:XXX:XXX:300::1 dev vmbr1 metric 1024 mtu 1500 advmss 1440 hoplimit 4294967295 2a01:XXX:XXX:301::/64 dev vmbr1 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev vmbr0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev vmbr1 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev tap101i1d0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 default via 2a01:XXX:XXX:300::1 dev vmbr1 metric 1024 mtu 1500 advmss 1440 hoplimit 4294967295 Does someone know why it isn't working? And is there a way to configure multiple v6 IPs from the same subnet so I can dedicate IPs to websites on a server with multiple virtualhosts?

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• Windows 7 ICS client web failure

  - by n8wrl

  I have several windows 7 PC's connected on a LAN via a hub. One has a Verizon 3G connection and works great. I have internet connection sharing enabled on it, which automagically set the LAN connection to 192.168.137.1 and enabled DHCP. I am trying to get the client PC's working one at a time. The others are off. The client is able to: Get an IP via DHCP with correct settings. Ping any web address I can throw at it, so DNS and routing are working. Windows update works. But web sites hang in IE. All but google.com! I type www.msn.com, microsoft.com, amazon.com, etc. etc. All ping via a cmd window but IE just hangs - it says web site found but the green progress bar just slowly creeps and no content displays. www.google.com comes up even after clearing browser and dns cache. I am pulling my hair out - what am I missing? EDIT: After some more gyrations with a router I'm back to ICS. Same symptoms, only now I have an answer to Andrew's question, YES I can do Google searches but clicking on any of the result links hangs! Let one sit for half an hour with no timeout or error.

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• How to setup a hyper-v domain with internet access

  - by fynnbob

  First off let me say that I'm not a network admin or server guy, I know very little about that stuff. What I'm trying to do is setup a virtualized domain using hyper-V. Here is the configuration: Physical Server: 4Mb RAM Windows Server 2008 R2 running Hyper-V Virtual Environment: One Domain Controller running Windows Server 2008 R2 One Client running Windows Server 2008 R2 I have been successful in setting up a virtual domain controller and adding a virtual client to that domain controller but I'm stuck at trying to give the virtual Environment Internet access. I can give the client VM Internet access if I remove them from the virtual domain but once I add them back to the virtual domain, Internet access is gone. I've read articles describing many different ways this can be done (using RRAS with NAT, using a wireless connection, etc...) but all of those articles only cover a small piece of the setup and also seem to be geared towards people who know there way around networking and servers which I don't. I'd like to know more but my thing is software development and I have my hands full trying to keep up with everything in that realm. I simply want to setup a virtual domain with Internet access for testing. Can anyone point me to any "for Dummy's" type information on how to setup this type of environment or can anyone provide this kind of step-by-step help. Any help would be very much appreciated.

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• sbs-server with 2 nics and 2 connections to the internet with different providers not working as it

  - by erik-van-gorp

  We have the following configuration : A sbs-2003 server in a domain (mydomain.com) with 2 network cards, each connected to a different network (provider), with different gateways, one for web and one for mail and clients. (we do this because the bandwitdh we get from our providers is too small to handle all the mail(+spam) traffic and webservices, so we took 2 providers) DNS is as follows : www.mydomain.com 1.2.3.4 mail.mydomain.com 5.6.7.8 NIC 1(192.168.1.3) is connected to to the internet through a firewall at 192.168.1.1, having wan address 1.2.3.4 NIC 2(10.0.0.3) is connected to to the internet through a firewall at 10.0.0.1, having wan address 5.6.7.8 Both nics have their default gateway installed at their corresponding routers. Also the metrics are set equal. (i know this isn't a supported config, but it works more or less). In this configuration i can use RDP on both wan adresses, and telnet to port 25 works as well on both. The issue now is that since a few weeks , we get regular disconnections, and website hickups(timeouts), several per hour. If we set one router to a higher metric, that route no longer works. In short, I want the mails to route through NIC2 and the web through NIC1. Any better configuration (without installing a second mail server) ?

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• Looking for ballpark pricing on an affordable a Cisco VOIP solution for our office

  - by guytech

  We have about 8 incoming PSTN lines that are currently on an old and antiquated Nortel Meridian ICS system. This system has been giving us some grief. We're looking for a new VOIP solution. I've been looking at a Cisco solution and it does seem pricey but I'm sure effective. Unfortunately, we probably can't afford a Cisco Unified Communications 520 which seems to be the ideal solution. We have about 15 people who need an extension and voicemail. We really don't have any need for a fancy system just an auto attendant of some sort when people call us. It looks like we'll have to get an older router and an addon card for what we're looking for to get best value pricing. However, I don't know a a lot about Cisco voice products so I'm a bit lost as to what to get. The only thing I am sure on is the pricing on VOIP phones which we expect to be about ~$100-200. However, I'm not sure what pieces of VOIP infrastructure to get. Any advice? I am familiar with Asterisk but right now I'm looking on pricing concerning a Cisco solution.

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• Find slow network nodes between two data centers

  - by 2called-chaos

  I've got a problem with syncing big amount of data between two data centers. Both machines have got a gigabit connection and are not fully occupied but the fastest that I am able to get is something between 6 and 10 Mbit = not acceptable! Yesterday I made some traceroute which indicates huge load on a LEVEL3 router but the problem exists for weeks now and the high response time is gone (20ms instead of 300ms). How can I trace this to find the actual slow node? Thought about a traceroute with bigger packages but will this work? In addition this problem might not be related to one of our servers as there are much higher transmission rates to other servers or clients. Actually office = server is faster than server <= server! Any idea is appreciated ;) Update We actually use rsync over ssh to copy the files. As encryption tends to have more bottlenecks I tried a HTTP request but unfortunately it is just as slow. We have a SLA with one of the data centers. They said they already tried to change the routing because they say this is related to a cheap network where the traffic gets routed through. It is true that it will route through a "cheapnet" but only the other way around. Our direction goes through LEVEL3 and the other way goes through lambdanet (which they said is not a good network). If I got it right (I'm a network intermediate) they simulated a longer path to force routing through LEVEL3 and they announce LEVEL3 in the AS path. I basically want to know if they're right or they're just trying to abdicate their responsibility. The thing is that the problem exists in both directions (while different routes), so I think it is in the responsibility of our hoster. And honestly, I don't believe that there is a DC2DC connection which only can handle 600kb/s - 1,5 MB/s for weeks! The question is how to detect WHERE this bottleneck is

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• Sparc Solaris 2.6 will not boot

  - by joshxdr

  I have a very old Sparc Solaris network that was working fine last week, but after a power outage none of the workstations will boot. The network looks like this: host A: solaris 2.6, shares /export/home to network by NFS host B: solaris 8, runs NIS server. Mounts /export/home/ by NFS. host C: RHEL5, shares /share to network by NFS. Mounts /export/home/ by NFS. I figured that the main problem was host A, since you need the home directories available for the other workstations to boot(?). Host A does not mount anything by NFS as far as I know. However, this workstation will NOT boot. The OBP bootup sequence looks like this: Boot device <blah> configuring network interface le0 Hostname <hostname> check file system <everything ok> check ufs filesystem <everything ok> NIS domainname is <name> starting router discovery starting rpc services: rpcbind keyserv ypbind done setting default interface for multicast: add net 224.0.0.0: gateway <hostname> <HANGS at this point> Is there some kind of debug mode so that I can get more detail as to why the workstation won't boot? Is my network structure inherently susceptible to power outage? Is there a way I can boot up to command line so I can at least turn off the NFS mounting?

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• Known USB 2.0 devices don't install driver, but must be manually forced

  - by Darragh

  When a known USB 2.0 device is plugged in and detected, it doesn't install the driver correctly but shows a Code 28 error and lists the device under "Other Devices" in Device Manager. When view properties of this device , it shows the following status; The drivers for this device are not installed. (Code 28) There is no driver selected for the device information set or element. To find a driver for this device, click Update Driver. When updating the driver manually and selecting the appropriate driver Windows doesn't believes it's the correct driver, but you can force the installation and it works! The other condition the driver will auto-install is when the same USB device is plugged into a USB 3.0 port. Power related issues are not also causing this as I have tried vi a Docking station, USB hub. etc.. Devices tried; Jabra Headset USB-Mass Storage Device (flash disk and ext HD) MS Wireless Keyboard & Mouse USB Ethernet controller (USB-MAC controller) This is on a laptop part of a Domain with Windows 7 Ent 7601, I am logged in as a local administrator. There isn't any Group Policies blocking not signed driver or whitelisted devices on the domain. Any suggestions please feel free

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• Printing special / extended characters on web page - Firefox or printer issue?

  - by edmicman

  My dad brought this to my attention and I'm looking into it, but thought I'd post here and see if anyone has any ideas... He's running Win7, using Firefox and printing to a wireless connected Brother HL-2170W printer. He's got a web page (http://cornandsoybeandigest.com/inputs/fertilizer/applying-nitrogen-after-planting-0512/index.html) that has extended/special characters in it - the funny "a" in Fernandez. The characters show correctly in Firefox on the page. He printed it, and the extended "a" printed as a diamond with a question mark. He says it shows that way in the print preview, too. I pulled up the same page in Ubuntu, Firefox, and it displayed in my print preview and physically printed everything correctly. I just checked on my wife's Win7 PC in Firefox and the print preview looked correct on her system, too. We have a Brother 2040 here. Soooo, my question is, is this possibly a problem in the browser somehow, or the printer driver? I'm leaning towards the printer driver now, but I can't say I've run into this before. Is it a setting somewhere? I just installed this printer for him the other day, using the CD that came with it; I could try updating the driver from Brother's website I guess. Is there anything else I should look at or check? Thanks!

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• Setting Remote Desktop to allows IPv6 connections

  - by Garrett

  Setup: Basically I have 3 machines (2 virtual and 1 physical) that I would like to be able to RDP in to from outside my NAT (a router). The VMs are Windows 7 and Windows XP, both fully patched with Teredo installed and working, both running in VirtualBox (their host also has Teredo working, though I'm not sure if that matters). They both have bridged network adapters with promiscuous mode enabled. The physical machine is Windows 7 fully patched with an HFS server running on it and a dynamic DNS set up for my public IPv4 address and port forwarded. It also has Teredo installed and working. Symptoms: According to http://test-ipv6.com/ all 3 have public IPv6 addresses, and they can all connect to http://ipv6.google.com/. I can ping the XP VM from the host it's running on but I cannot ping it from any other machine. Also, I cannot ping either of the other machines from anywhere. I cannot connect to any of them over RDP from IPv6, however I can connect to all of them through IPv4. Any ideas what is going wrong?

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• Cisco 7206 error trying to copy running-config (Bad file number)

  - by jasondewitt

  I have a cisco 7206 that terminates a bunch of pppoa sessions for dsl users. Today I noticed that if I tried to "show run" nothing happened. I mean that it doesn't show anything and just sends me right back to the command prompt. I decided I should probably try and back up the config and that is where I'm stuck. Any time I try to copy the running-config to tftp or to pcmcia card that I know is not full I get the following error: %Error opening system:/running-config (Bad file number) I get this error when I try to do anything with the running config. I've been googling around, but I haven't found any thing else that talks about this error. I've seen people say to erase the nvram and then try to "copy run start", but I don't want to erase the nvram until I can pull off a copy of the running-config. I would try to reboot it, but the startup-config that is on the nvram looks to be woefully out of date (good job me!). Any ideas what might be wrong? or how I can get the running config off the router?

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• Problem with ubuntu 10.10 running from USB drive

  - by Surjya Narayana Padhi

  Hi Geeks, I recently downloaded Ubuntu 10.10 and created an USB drive with that. I started to run the Ubuntu from that USB drive. But I am facing so much problem. I am thinking why its not so much easy like Windows to do all my job in ubuntu. Always I get some error message or to install something. This time I am getting the following errors. I am trying to download and install Aircrack-ng. So used the command sudo apt-get install aircrack-ng. But the installation stops with the following error : update-initramfs: deferring update (trigger activated) cp: cannot stat `/vmlinuz': No such file or directory dpkg: error processing bcmwl-kernel-source (--configure): subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: initramfs-tools bcmwl-kernel-source E: Sub-process /usr/bin/dpkg returned an error code (1) I don't even have the aptitude command installed till now. Are all these errors because of I am running the ubuntu from USB drive? Is there any simple and easy way to go to Ubuntu Software Center and download all the required essentials at one shot and then Aircrack-ng? I could not find the Aircrack-ng in Ubuntu Software Center Can anybody give me detail steps to solve all my problems above. I am frustrated searching for updates and installations. When something works and something does not work. Can anybody suggest me how I should proceed after installing ubuntu to run on a USB drive. So that I can use the OS like Windows. Like software download,wireless driver, sound, video, documents, C:, D: all things should be there. Please somebody help.

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• Problem connecting to remote network using demand-dial VPN interface with Windows Server 2003

  - by Mike Forman

  I have a Windows 2003 server (SP2) that I'm trying to set up route traffic from my local network using a VPN My local network has the following components: Broadband router (192.168.0.1) Windows Server with a single NIC running RRAS (192.168.0.2 def. gateway = 192.168.0.1) Client Machine (192.168.0.3 def. gateway = 192.168.0.1) Using a VPN connection, I am trying to access a remote machine (10.0.0.1 for example) I configured RRAS with a demand-dial interface for the VPN and set it to be a persistent connection. As part of that setup, a static route to 10.0.0.0 (255.255.0.0) was created. When at the console of the server, I can ping 10.0.0.1 with no problems I added a route on the client machine using the following command: ROUTE ADD 10.0.0.0 MASK 255.255.0.0 192.168.0.2 If I run tracert 10.0.0.1 from the client, the first hop is to 192.168.0.2 which tells me that route is working. However, I cannot ping 10.0.0.1 from the client machine. What am I missing? Hopefully something simple.

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• Delayed internet access

  - by Joel Coel

  When I (and presumably my users) first start up or log in to my computer I can't get internet access until several minutes after logging in. Internet pages like serverfault.com will time out. During this time I can access internal web servers. Sometimes pinging the gateway seems to fix the problem. I'm using Windows 7 on this machine with wifi, and the problem seems limited to the wifi network, which is on a separate vlan. The wired network does not share the problem, but I know it's not the wifi connection itself because the internal sites work. The wifi access point is attached to a 3Com 4200 switch, with the port set for vlan 2 untagged, vlan 1 tagged. The 4200 has a fiber connection to a 3Com 4900SX fiber switch that acts almost as a router here. The fiber connection is vlan 1 untagged vlan 2 tagged at both ends. The gateway is then attached to a different 4200 (vlan 1 untagged, vlan 2 tagged) that has a similar fiber connection to the 4900SX. vlan 2 has 192.168.8.0/22 IPs, vlan 1 has 10.1.0.0/16 IPs. The 4900SX has an interface for both vlans (10.1.1.1/192.168.8.1), as does the gateway (10.1.1.5/192.168.8.5). There is one dchp server for both vlans on the same switch as the gateway. It chooses a dhcp scope based on the interface used by the 4900sx to forward the dhcp request. There is also a network access list on the 4900sx set to deny all vlan2 traffic to any 10.1.x.x host, with exceptions made for a few servers, including dhcp, 4900sx, and the gateway. I think that about covers it. Any ideas on why internet access would be delayed like this?

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• Technology mash: is this possible?

  - by Jon Story

  I'm in the process of setting up my own DNS+hosting on a couple of VPS and my home machines, mostly for academic/learning purposes, but also for convenient accessing of my files, hosting my personal websites, private git repositories etc. I've got a main web server with DNS, and a slave DNS server. I've also got a couple of machines at home doing file hosting, video streaming and all that fun stuff. I'm intending to use my VPS's to provide myself with a dynamic DNS system so that I can point mydomain.com at my DNS servers, with home.mydomain.com going into my home network via a raspberry pi. HOWEVER.... I've not got access to the network infrastructure at home (rented accommodation with managed internet), so I can't forward the ports on the router to my own machines. As such, I'm wondering if it's possible to route all the traffic via an SSH/HTTP tunnel through one of the VPS? My plan is to have the raspberry pi provide a VPN into my home network. The raspberry pi uses SSH to connect to the VPS, and the VPS forwards any traffic to home.mydomain.com via the tunnel to the raspberry pi. Is this even possible, and how do I go about it? I don't mind getting my hands dirty with coding and low level tools, I'm just not sure where to start or what the best way to go about it is.

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• VPN - local and remote networks IP collision

  - by Guido García

  I have created a VPN connection in Windows using the New Network Connection wizard that comes with Windows. It works without problems in most places, but there is one concrete place where, despite the connection to the remote public IP works fine, it is not able to validate the login/password and establish the VPN connection. In this place, the network is 10.0.0.x (the same I use in other places where I am able to connect). The remote network is 192.168.x.x, so I suspect there is some kind of IP collision, because before connecting, a traceroute to i.e. 192.168.0.40 does not fail. 1 4 ms 1 ms 1 ms LINKSYS [10.0.0.1] 2 5 ms 1 ms 1 ms 172.26.27.1 3 4 ms 5 ms 3 ms 192.168.1.100 ... (more) I can't modify the local network further than the first router (10.0.0.1). That is the only different I've found so far. Any idea about how to solve it? Thank you.

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• Trouble in Team Viewer VPN Connection

  - by Sumit Pal

  I have completed initial vpn connection setup. It has connected. I have tested with ping and it is ok. My problem is, when I want to start file transfer in VPN it asks for username & password. So what is the user name? I have tried giving Computer-Name/User-Name. I have found my Computer Name by going to Control Panel/System/ & clicking 'Computer Name' tab & username from user accounts or it is shown when I login in windows account (Please correct me if the above procedure is wrong). But what is the password? I have tried giving the account password but it always give 'The username or password is incorrect.' My Question: How to find the username & password? For Information: a) I have Team Viewer 7 installed in one Windows XP PC & one Windows 8 PC. I like to create a secure connection between these two PCs. b) The two PCs are connected in the same local network via a router. Please ask if you need additional information.

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• Power Outage Interrupted Upgrade from Windows Vista Ultimate to 7 Ultimate, Reverted to Vista, Now Vista is failing... What Next?

  - by tednewk

  I was in the midst of what seemed to be a successful upgrade from Vista Ultimate to 7 Ultimate when there was a brief blackout. The upgrade failed and Windows reverted back to Vista. Now Vista is very slow to boot, has problems waking back-up from inactivity and quickly loses it's wireless connection. The wake-up problem manifests itself as the mouse is clearly shown on a black screen but I have no access to the Desktop or Taskbar or Explorer. Even Alt-Ctrl-Delete doesn't seem to work. No task menu, no reboot. Hitting the reset button reboots the machine with the usual Black Screen warnings offering Safe Mode. I tried to do a system restore to a point before the upgrade. That didn't seem to work. My guess is that my system is a mutant with parts of Vista and parts of 7 crashing each other. I would like avoid a clean install if at all possible to avoid reinstalling other software. What should I try now? My thoughts are: My a system back-up to lock the computer in place Trying a second 7 upgrade If that appears to be working make another back-up If not reload back-up and try a repairing Vista from DVD. If that appears to work make another back-up, let system stablize about a week then try 7 install again If that doesn't work are there any other options to try before settling for a clean install? Another complication, I am doing this by "remote control". I'm traveling with my job and I'll be talking my son through it over the phone. (Kind of like the landing the 747 cliche from all the 70's adventure shows!) So is there a way of simplifying the steps? Thanks Ted

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• Ping with explicit next-hop selection (aka Monitoring multiple default gateways)

  - by Michuelnik

  I have a linux (debian) router with two internet connections (A) and (B). (A) is preferred, (B) is fallback. I want to monitor the internet connection (and not only the availability of the gateways!) and change the default route appropriately. If (A) is not providing internet, switch to (B) If (A) is providing internet again, switch back to (A). Only problem I have is in case (2). My routing table points towards a working internet so I cannot easily detect whether internet is working over link (A) again. I am search for a ping or traceroute (or other diagnosis-tool) which can select the next-hop explicitly. ping -r looks promising, but can only ping a host on the lan. (It only has to write another destination address in the packet, damnit!) traceroute -g gateway looks even more promising and nearly does what I want - but sets source routing options which my next-hops deny. (Not within my administrative boundary...) I just want a $ping, that can: select a source interface (and address) select a next-hop on that interface ping any arbitrary ip address I could do evil trickery with policy-based routing but that would have production impact for all users. I would like to see a side-effect-free solution....

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• Puzzling TCP performance over 3G / UMTS

  - by lemonsqueeze

  I'm using 3G as my primary internet connection, and TCP over this thing is getting more puzzling every day. For example: Downloading from kernel.org is crazy fast: $wget http://www.kernel.org/pub/linux/kernel/v3.0/linux-3.6.8.tar.bz2 increases to ~500kB/s after a few secs ! Some servers are incredibly slow, for instance www.graphic-pc.com:Same thing, downloading a big file with wget it starts at ~30kB/s for a split second, then collapses to 5-10k or even worse. Web browsing is decent but somewhat unreliable. Randomly, a page will take really long to load or even fail to load, but a reload can succeed almost immediately. Now, by chance i started playing with OpenVPN over UDP on top of the 3G connection, and OMG suddenly everything's extremely fast !Same www.graphic-pc.com now shoots at 100-200kB/s ! What's going on here ??? How come it is so much better with the VPN than without ?? And why does graphic-pc.com crawl when kernel.org flies ?Something to do with my tcp stack (or the server), or some buggy router in between ?? Notes: Setup is laptop running Ubuntu Lucid and a Huawei 3G dongle (So direct pppd connection). I can reproduce this pretty much any time during the day and I'm not moving, so it's clearly not cell environment or internet congestion. (although kernel.org without VPN sometimes does worse in the evening, 60kB or so - but still 500kB with VPN !) For 2) wireshark shows retransmitted packets, dup ack's, even out of order sometimes. I've tried playing with different /proc/sys/net/ipv4 parameters (tcp_rmem, window_scaling, tcp_congestion...) doesn't seem to make a difference. Update: Tried under windows 7 (no VPN) with some interesting results: tcp settings : default tcp_optimizer kernel.org : 10 kB/s 20 kB/s graphic-pc.com: 8 kB/s 70 kB/s ! tcp_optimizer turned on ctcp among other things. Have to check what os graphic-pc.com is running, my bet is linux's tcp_westwood and ms ctcp don't mix well here...

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• Trouble with Russian pc's on my wifi

  - by hogni89

  I have created a WiFi hotspot for the local community. The problem is, some Russian PC's (Windows XP, Windows Vista and Windows 7) can't get internet connection (We have a lot of bypassing russian fishing vessels / cargo ships). The pc's obtain a valid IP address, and some of them can even manage to send some few packages - But none of them are usable on the network. They all say "Limited internet access" or "???????????? ?????? ? ????????". The thing these PC's have in common is, that they all run a Russian installation of Windows. No one else has problems with the WiFi hotspot - Danish and English Windows, Linux and OS X all work like a charm. Can it be, that there is a difference between the danish / english windows installation, compared to the Russian installation? EDIT START They can't ping the router (One PC got one response - ONCE), they can't access any sites and Windows newer asks "Is this network public, home or work?". EDIT END PS: The hotspot is a airMAX rocket M from Ubiquiti Networks, Inc (www.ubnt.com)

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