Re: OpenVPN packet structure

On Tue, 30 Jun 2009 20:08:34 +0300, Cosmin Marin wrote:
> I was wondering if the payload of an OpenVPN packet has the same structure
> as a normal IP packet(ethernet header/ip header/tcp or udp header).

Depending on whether you are using tun or tap mode you either get the raw IP
packet or the raw ethernet frame in the OpenVPN packet.

> I know that OpenVPN adds fields like the packet header and data payload
> header after encryption and another IP header and TCP/UDP header, but
> i have been trying to get the old ip source and destionation addresses after
> i have decrypted the packet and i am out of luck.

The easiest thing might be to start with "cipher none" to disable encryption
and have a look at the packets.

Christof

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