28 Jul
2013
28 Jul
'13
6:41 p.m.
On Sat, 27 Jul 2013, Eric Fort wrote:
Why does the interface upon which the rip packets
arrive matter to a
standard ripd daeon? Does the tunnel encapsulation type matter? (would it
matter or depend upon if this was l2tp/ipip/pptp/openvpn/gre/etc?) How is
a rip packet that arrives on interface tun0 fundamentally different from
one that arrives on eth0?
It's treated differently because the introduced route will reference a
next-hop based on the tunnel destination address of the gateway associated
with that route, not on the interface the announcement was received on or
the address of the neighbor that sent the announcement. Other than BGP
multi-hop and DMVPN, most common routing protocols use a next-hop based on
the latter. You may get the full routing table but they wont use a full
mesh of links.
On the other hand, if having a full mesh of tunnels is not so important,
you can run standard routing protocols with cooperating tunnels/gateways.
Antonio Querubin
e-mail: tony(a)lavanauts.org
xmpp: antonioquerubin(a)gmail.com