James Carlson wrote:
On 01/12/11 16:17, Jan Just Keijser wrote:
James Carlson wrote:
The whole point of a point-to-point interface (of any type; PPP, tunnel,
or otherwise) is that it connects two distinct IP nodes. Distinct. Not
one IP node to itself!
This is another trick of OpenVPN to assign "linear addresses" to clients
while using a PtP (tun) interface. It is enabled in OpenVPN 2.1 (and
openvpnas, which is based on 2.1) by using the
topology subnet
directive.
That's simply frightening. Thanks for the update; I had no idea anyone
was relying on that sort of undocumented OS feature.
Good luck getting a routing protocol to work reliably with that ...
actually, this mode is not used in combination with routing protocols.
'topology subnet' is used primarily when multiple clients are connecting
to a single server. OpenVPN also support a "point-to-point" mode (for
lack of a better term), which does follow the regular PtP semantics.
Running a routing protocol in that mode is just as easy as running one
over a ppp-based link.
HTH,
JJK
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