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Re: [Openvpn-users] --redirect-gateway makes DHCP-ip default gw [SOLVED]


  • Subject: Re: [Openvpn-users] --redirect-gateway makes DHCP-ip default gw [SOLVED]
  • From: Ferenc-Jan <ferenc@xxxxxxxxxxxxx>
  • Date: Wed, 15 Dec 2004 21:02:09 +0100

I am having problems with 2.0 server (1.6/2.0 p2p work fine) between W2K and Linux. Tunnel gets set up successfully (ping, smb works), but the w2k routing table looks strange to me. The tunnel entries are:
192.168.4.1 255.255.255.255 192.168.4.5 192.168.4.6 1
192.168.4.4 255.255.255.252 192.168.4.6 192.168.4.6 1
192.168.4.6 255.255.255.255 127.0.0.1 127.0.0.1 1

The routing table above looks correct. Windows does not support true Point-to-Point tunnels as the TAP driver is currently implemented, therefor OpenVPN emulates this by using a /30 (255.255.255.252) subnet.

I'm lost here. When doing p2p (with 1.6 or 2.0) I get .4.0, .4.2 and .4.255 in the routing table. Where can I read up on this? I should probably do some googling on routing, 'cause I still don't quite get it.


When you are assigned IP address 192.168.4.6, .5 is your gateway. .1 is OpenVPN's IP address yes, but not on the /30 subnet that has been assigned to you.

I tried out --redirect-gateway, but that added 192.168.4.5 as the default gw, which obviously did't work.

That's what it should do.

Bloody silly me. I could not ping 192.168.4.5, so I never bothered to look beyond the firewall. It was blocking outbound traffic from .4.0. Everything works now. You've helped me a great deal (I've spent the weekend looking into this :-))


Thank you very very much!

cheers

Ferenc

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