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Thread: Why does my VPN connection kill Broadband?

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    HEXUS.timelord. Zak33's Avatar
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    Why does my VPN connection kill Broadband?

    OK...you're allowed to blame Virgin.net IF they're to blame as an ISP!

    But if not...blame me...and help

    When I use my Vigor 2600G to VPN in to work, it them wont work on broadband once I'm back out again.

    Have to reboot....wait 15 - 20 mniutes.....THEN it reconnects on Broadband.

    Any idea's why?

    Quote Originally Posted by Advice Trinity by Knoxville
    "The second you aren't paying attention to the tool you're using, it will take your fingers from you. It does not know sympathy." |
    "If you don't gaffer it, it will gaffer you" | "Belt and braces"

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    I need a coffee jamena's Avatar
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    I get (probably) related disconnection issues when using VPN and remote desktop. When I fire up VPN it seems to be working all very well and fine but the internet becomes inaccessible on my home machine's applications. I.e. I cannot normally browse on my home pc while I have vpn and remote desktop running to my work...although some applications sometimes manage to reconnect (everything loses connection for a while as it routes (I imagine) through the vpn.

    When I disconnect vpn anything that had managed to maintain connectivity drops/times out, and then everything reconnects as the computer re-routes (I suppose?) everything away from the vpn again.


    does "repair"ing your network conenction not work then?

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    Quote Originally Posted by Zak33
    OK...you're allowed to blame Virgin.net IF they're to blame as an ISP!

    But if not...blame me...and help

    When I use my Vigor 2600G to VPN in to work, it them wont work on broadband once I'm back out again.

    Have to reboot....wait 15 - 20 mniutes.....THEN it reconnects on Broadband.

    Any idea's why?
    Runs in, points at Vigor 2600G and leaves.

    Tried a different router?

    not sure but could it be a port forwarding issue. I know that seems like its not the case but could cause a conflict of some kind if the router is not killing the connection to the VPN network.

    i dont know alot about VPN's - but have set them up and used them

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    HEXUS.social member Agent's Avatar
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    Updated your firmware ?
    Also, have you rebooted the PC between making a VPN connection ? - helps narrow down where the prob is if its still not working after a reboot.
    Last edited by Agent; 23-11-2005 at 05:04 PM.
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    I VPN a lot and have not had the problems you describe although I have had general wireless mod/router problems recently on a USR 9106. It then refused to work at all.

    I replaced with a D-Link which would not set up a connection properley. I called D-Link as they actually provide real customer support and was asked to review the wireless properties. Both DNS entries were empty (default and alternate) and the guy then asked if I had Apple's iTunes installed. I did as it comes with the new version of Quicktime.

    Apparently (according to D-Link support) iTunes likes to redirect your pc to other places and messes with the DNS addresses on your PC. I inputted the DNS addresses again and removed iTunes. Only 1 minor problem on desktop since.

    The VPN connection would not work on laptop though, so I returned the D-Link box to factory settings and booted up the laptop - worked first time. This was due, I believe to the way the box had cached the settings or something like that.

    Anyway all fine now. However I do know that another person in work had a netgear that used to mess around with the VPN - exactly as you describe.

    Hope this helps.

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    Administrator Moby-Dick's Avatar
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    Matt give me a bell tonight and I'll go through it with ya

    it can depend on the type of VPN used. some are a bit on the selfish side
    my Virtualisation Blog http://jfvi.co.uk Virtualisation Podcast http://vsoup.net

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    TiG
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    Quote Originally Posted by Zak33
    OK...you're allowed to blame Virgin.net IF they're to blame as an ISP!

    But if not...blame me...and help

    When I use my Vigor 2600G to VPN in to work, it them wont work on broadband once I'm back out again.

    Have to reboot....wait 15 - 20 mniutes.....THEN it reconnects on Broadband.

    Any idea's why?
    The VPN will likely use the technology of use remote default gateway. This will allow you to access all the releveant servers and services you need to from the work network, and will likely allow you to surf the internet via the work connection.

    This means the internet is likely slower when you are connected. (try a speed test on adslguide.org.uk with the VPN on and off to decide)

    As soon as you come off however, the internet will not be accessible as the default gateway should change back to the virgin.net default gateway and sounds like it doesn't. Meaning you lose the net connection.

    I don't know if you are using a tool to connect to the VPN or using the standard windows XP VPN connection, resolution will depend on this. (my guess is you are using something like cisco remote client or something of this ilk and I believe this is a known issue with the software)

    May be wrong but, this seems like what it is to me.

    TiG
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    Administrator Moby-Dick's Avatar
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    Thats where I'm thinking too TiG - some VPN clients are really greedy and if a split tunnel is denied , then the host machine can ONLY access resouces down the tunnel - they other fun can occur if you have a similar subnet / ip schema to the remote client.

    it would help if we coudl have some IPconfig/all screenshots , before , during and after a VPN session.
    my Virtualisation Blog http://jfvi.co.uk Virtualisation Podcast http://vsoup.net

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    Quote Originally Posted by Ramedge
    Runs in, points at Vigor 2600G and leaves.
    Definitely some more config/settings info needed before we start randomly blaming decent hardware..

    S.
    Last edited by BlueMagician; 23-11-2005 at 03:58 PM.

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    Quote Originally Posted by TiG
    The VPN will likely use the technology of use remote default gateway. This will allow you to access all the releveant servers and services you need to from the work network, and will likely allow you to surf the internet via the work connection.
    You cant surf the internet over any normal VPN link. PPTP and IPSEC simply dont forward packets more than 1 hop.
    If use default gateway on remote network is selected you will only be able to access the subnet you are VPN'd into. Split tunnels are a pain in the arse though as they often need a static route setting up to work properly.
    "In a perfect world... spammers would get caught, go to jail, and share a cell with many men who have enlarged their penises, taken Viagra and are looking for a new relationship."

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    TiG
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    Depends on what you are doing with the VPN, if like i said you are using Cisco VPN Client, you gain a remote desktop like connection and from this machine have access to e-mail etc, you can still browse the internet via this machine.

    PPTP will allow packets more than 1 hop.. (A tracert while connected to a remote VPN to ping google) Note I'm on a subnet that is 10.0.0.0 not 192....

    U:\>tracert www.google.co.uk

    Tracing route to www.l.google.com [216.239.59.147]
    over a maximum of 30 hops:

    1 73 ms 85 ms 60 ms 192.168.249.210
    2 51 ms 32 ms 37 ms [192.168.249.1]
    3 53 ms 42 ms 29 ms xxx.xxx.xxx.xxx
    4 28 ms 25 ms 24 ms xxx.xxx.xxx.xxx
    5 116 ms 78 ms 40 ms xxx.xxx.xxx.xxx
    6 45 ms 37 ms 154 ms xxx.xxx.xxx.xxx
    7 48 ms 123 ms 95 ms 216.239.49.254
    8 49 ms 53 ms 63 ms 216.239.48.158
    9 49 ms 40 ms 48 ms 66.249.94.223
    10 73 ms 88 ms 54 ms 216.239.59.147

    I should have better specified what i was doing with the VPN, but it is indeed possible to browse while connected to a VPN.

    TiG
    Last edited by TiG; 23-11-2005 at 04:29 PM.
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    Administrator Moby-Dick's Avatar
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    Quote Originally Posted by badass
    You cant surf the internet over any normal VPN link. PPTP and IPSEC simply dont forward packets more than 1 hop.
    If use default gateway on remote network is selected you will only be able to access the subnet you are VPN'd into. Split tunnels are a pain in the arse though as they often need a static route setting up to work properly.
    Not Strictly true - or I wouldn't be able to connect to any of our branch sites on different subnets when I VPN in
    You'd also be able to make use of proxy servers at the other end of the tunnel. ( as our branches do - they are connected through an IPSEC encrypted tunnel over our own IPstream link )
    I've used split tunnels for ages and havn't had a problem with them - I also make use of multiple gateways at home ( routeing SMTP traffic via a dsl provider that gives me SMTP access for example )

    however, that doesn't have anything to do with why Zak has problems browsing after disconnecting a VPN ( of unknown type at present ) - All will become clear after I have spoken with him
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    Oh no!I've re-dorkalated! Jiff Lemon's Avatar
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    Quote Originally Posted by Ramedge
    Runs in, points at Vigor 2600G and leaves.
    /Prepares to stone the heretic......

    My money is on a greedy client VPN app (given that it's a corporate laptop).

    Zakky, if you need somewhere to VPN to from a home PC (to prove the point) just holla.

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    Quote Originally Posted by badass
    ...Split tunnels are a pain in the arse...
    Am I the only one giggling like a schoolgirl reading that? Sorry.. It's been one of those days..

    Can't add more to what's already been suggested - hope you get it sorted Z..

    S.

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    HEXUS.timelord. Zak33's Avatar
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    you lot rock...will ring Moby...then Jiff....then TiG

    and see which one gets router envy

    Quote Originally Posted by Advice Trinity by Knoxville
    "The second you aren't paying attention to the tool you're using, it will take your fingers from you. It does not know sympathy." |
    "If you don't gaffer it, it will gaffer you" | "Belt and braces"

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    Administrator Moby-Dick's Avatar
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    lol I have a feeling my mobile ran outta batteries
    my Virtualisation Blog http://jfvi.co.uk Virtualisation Podcast http://vsoup.net

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