[pptp-server] linux to linux pptp connection
HVR
hvrietsc at yahoo.com
Wed Nov 14 11:34:09 CST 2001
i think we are on to something, but let me explain my setup:
we have several win/2k and win98 laptops, they all have a orinico
wireless card, via this wireless card they connect to the lucent
basestation, this lucent basestation is plugged into eth0 of a linux box
firewall. the linux box does dhcp so all the laptops get a 10.1.1.0/24
ip address it then does MASQ/NAT and send each packet coming in on eth0,
out on eth1 which is connected to our LAN.
However it will ONLY forward packets going out on eth1 which are going
to the linux box running pptpd. pptpd box then authenticates and assigns
ip to the tunnels in the 192.168.1.0/24 range and then NAT/MASQ the
packets coming from within the tunnel out into the LAN. doing this
forces all over the air traffic (between laptop client and the
basestation) to be pptp encrypted (since only packets going to the pptp
server are forwarded, and these are encrypted).
now the problem i have is that when multiple laptop clients are NATed
via the linux box firewall then pptp will only set up one tunnel for all
of them: quite messy!
picture(?):
laptop-W2k/w98
|
lucent basestation
|
eth0 on linux firewall
DHCP to laptop
NAT to eth1
firewall rule: only packets going to pptp box are let thru
eth1
| (this is our LAN)
|
pptp box
authenticate
NAT but only if from a pptp tunnel
|
internal LAN
With frees/wan i would like to be able to setup IPsec from each laptop,
NAT them all via the firewall and have the pptp server (now just running
ipsec) be the receiving side.
so i need some fancy setup and i need ipsec support for win/2k and win/98
Any comments greatly appreciated.
Jordan Share wrote:
> Ok, yes. If you have a Linux-to-Linux connection, then I think you'd
> be better off getting IPSec working, and a tunnel set up between your
> two subnets.
>
>
> Do you have a static IP on both ends? That is really helpful, but I
> don't think it's needed (although I can't say for sure, since I do
> have a static IP on both ends).
>
>
>
> You have to make sure that the subnets that you are using are
> distinct. For example, at work we are using the 10.1.1.0/24 subnet,
> which I have connected to my network at home (192.168.0.0/24). That
> way, a route can be set up (FreeS/WAN does this automatically at each
> end) for the destination subnet, after the IPSec tunnel comes up.
>
>
>
> You end up with something like this:
>
>
>
> LAN1 - 10.1.1.0/24
>
> |
>
> 10.1.1.1 -- eth0 on linuxbox1
>
> |
>
> linuxbox1
>
> |
>
> a.b.c.d -- eth1 on linuxbox1
>
> |
>
> Internet
>
> |
>
> w.x.y.z -- eth1 on linuxbox2
>
> |
>
> linuxbox2
>
> |
>
> 192.168.0.1
>
> |
>
> LAN2 - 192.168.0.0/24
>
>
>
> Then machines on my LAN at home send their packets to linuxbox2, which
> encrypts and tunnels them to linuxbox1, which decrypts and sends them
> on to the machines on LAN1.
>
>
>
> This kind of thing is really easy to set up with FreeS/WAN. If you
> need to do windows browsing and whatnot, then you'd need to fool
> around with a WINS server for your network neighborhood to connect
> properly (Samba is working fine for us in this respect, although you
> probably are already using a WINS server if you have a windows domain).
>
>
>
> Jordan
>
>
>
> ----Original Message-----
> *From:* pptp-server-admin at lists.schulte.org
> [mailto:pptp-server-admin at lists.schulte.org]* On Behalf Of *HVR
> *Sent:* Tuesday, November 13, 2001 11:55 AM
> *To:* Jordan Share
> *Cc:* Jerry Vonau; Tom Eastep; knollst at tronicplanet.de;
> pptp-server at lists.schulte.org
> *Subject:* Re: [pptp-server] linux to linux pptp connection
>
>
>
> Jordan Share wrote:
>
>>For remote access, it's probably easier to get PPTP "dialin" working. Freeswan does not support "remote" IPs in the same way. You do not lease an IP address on the local network, you just encrypt the traffic to and from a given IP/Netmask. This makes "roadwarrior" dialins a bit tricky. If you have a static IP on the Win2k box, then it's very easy to set up the IPSec tunneling. (Well, not easy, perhaps, but doable). If you want to connect roaming dialin users, then you need to jump through some hoops, or just use PGPNet, or some other IPSec client software to manage things.
>>
>>The original post I was replying to was talking about using PPTP to connect two LANs together. Which is something that I think is much better done with IPSec.
>>
>>Jordan
>>
>
> By problem is currently that i have multiple clients behind a
> linux box doing NAT/masquerading. so when the clients get to the
> pptp server they all seem to have the same ip address and hence
> pptp will only create one tunnel per ip and ALL clients will go
> thru this, which creates a big mess! i was hoping that we can
> either change pptp to allow mutliple tunnels per ip-pair or that i
> can use FreeS/wan somehow.
>
> The clients are a mix of win/2k/98 they connect to the linux box
> which will serve them an ip address via dhcp, and then the box
> will NAT all their packets which are then forwarded to the pptp
> server. and that is where i get into problems...
>
> i can explain why i am doing all this in case you are interested.
>
>>
>>-----Original Message-----
>>From: pptp-server-admin at lists.schulte.org <mailto:pptp-server-admin at lists.schulte.org>
>>[mailto:pptp-server-admin at lists.schulte.org]On Behalf Of
>>hvrietsc at yahoo.com <mailto:hvrietsc at yahoo.com>
>>Sent: Monday, November 12, 2001 8:30 PM
>>To: Jordan Share
>>Cc: Jerry Vonau; Tom Eastep; knollst at tronicplanet.de <mailto:knollst at tronicplanet.de>;
>>pptp-server at lists.schulte.org <mailto:pptp-server at lists.schulte.org>
>>Subject: Re: [pptp-server] linux to linux pptp connection
>>
>>
>>ok you got me curious, can i do the following with frees/wan:
>>
>>one secure box running frees/wan with one eth to the outside and one eth
>>to the inside.
>>
>>then can i
>>use win-2k and win 98 to connect to freesw/wan? if so what
>>do they use for making the tunnels. for pptp connections i just have them use the build
>>in vpn connector or whatever M$ calls this. so what about ipsec? is this supported
>>by win/2k and win98?
>>
>>On Mon, Nov 12, 2001 at 10:42:35AM -0800, Jordan Share wrote:
>>
>>>I'd have to agree that FreeS/WAN is probably what you want to go with. I've not had a tunnel go down yet. (Well, as long as our DSL stays up.) Also, you have the bonus that it interoperates with other IPSec implementations (an advantage you don't have with vtund). I set up FreeS/WAN for connectivity to our backside LAN at the colo center (connecting to a Netscreen100 firewall), and since then have been easily able to add in tunnels for my network at home (FreeS/WAN) and to a coworker's Win2k box.
>>>
>>>Plus, I really feel that the experience you gain in setting up a FreeS/WAN tunnel is far more broadly applicable to other IPSec installations than setting up some proprietary tunneling product (such as vtund).
>>>
>>>There's no way I'd ever use PPTP to tunnel two LANs together, if I had a choice. PPTP is for remote access, IMHO.
>>>
>>>Jordan
>>>
>>>-----Original Message-----
>>>From: pptp-server-admin at lists.schulte.org <mailto:pptp-server-admin at lists.schulte.org>
>>>[mailto:pptp-server-admin at lists.schulte.org]On Behalf Of Jerry Vonau
>>>Sent: Saturday, November 10, 2001 9:50 AM
>>>To: Tom Eastep
>>>Cc: knollst at tronicplanet.de <mailto:knollst at tronicplanet.de>; pptp-server at lists.schulte.org <mailto:pptp-server at lists.schulte.org>
>>>Subject: Re: [pptp-server] linux to linux pptp connection
>>>
>>>
>>>Tom:
>>>
>>>Just figured out vtund, I'm testing it now.
>>>Have you played with it? Seems stable.
>>>
>>>Jerry Vonau
>>>
>>>Tom Eastep wrote:
>>>
>>>>On Saturday 10 November 2001 08:28 am, Jerry Vonau wrote:
>>>>
>>>>>The fix is to have a reliable isp and hope their upstream is reliable.
>>>>>
>>>>Or switch to an IPSEC tunnel -- For Linux<->Linux tunneling, I've found
>>>>FreeS/Wan to be more reliable than PPTP.
>>>>
>>>>-Tom
>>>>--
>>>>Tom Eastep \ teastep at shorewall.net <mailto:teastep at shorewall.net>
>>>>AIM: tmeastep \ http://www.shorewall.net
>>>>ICQ: #60745924 \_________________________
>>>>
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>
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