vtun, bridging and dhcp

fabrice.gautier_at_gmail.com
Date: 04/30/05 

Date: 29 Apr 2005 17:08:59 -0700

Hi,

I'm trying to setup some kind of linux VPN.
The host network IP is (lets says) 192.168.1.x My goal is too have a
remote client computer connected to a virtual interface with an IP
adress in the 192.168.1.x range. Both client and "VPN server" are
running linux.

Right know it works as long as I use a static IP for the remote client.
Here are the details:

Initially I have "VPN server" (Server) in the host network with
eth0=192.168.1.1.

1/ On Server I configure a bridge br0 with only one port (eth0):
   br0=192.168.1.1, eth0=0.0.0.0
2/ I setup a vtun tunnel, ether type, between Server and Client so I
have two virtual interfaces tap0 on Server and tap1 on Client
(unconfigured yet)
3/ I add tap0 port to br0 and bring it up
  tap0=0.0.0.0
4/ I manually configure tap1 on Client :
  ifconfig tap1 192.168.1.101

This works fine, my Client is now seen as being on the host network,
and I can ping anyways...

Now if I replace 4/ by ifup tap1, with tap1 configure for dhcp, its not
working so well. Apparently I get a DHCP lease from a server on the
host network, but then it stalls and eventually the tunnel will
disconnect and I will even loose my ssh connection to the Client.

Any ideas why DHCP is different ?

Thanks

-- F.G.

Relevant Pages

  • Re: VPN clients unable to connect to other resources.
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    (microsoft.public.windows.server.sbs)
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    (microsoft.public.windows.server.sbs)
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    (microsoft.public.windows.server.sbs)