Thanks for the response.
I am not getting why tunnelling mechanism should be in slow path.
If we check intel IXP2400 chip, all tunnelling mechanism has been put
in fast path.
Also, if we consider automatic tunneling, which need to perform look
up for a ipv4 route. Forwarding table will be in fast path and we try
to perform route look up for a particular route. How will it
work?
regards
ari.
Hi Ari,
I have a doubt regarding ipv6 over ipv4 tunnel.
I think your questions are pretty generic to any IPinIP tunnels.
1. When a tunnel is configured, source and destination isYou need to put these source and destination addresses in the tunnel
configured.
Is it sufficient to configure destination address only. My means
to say why source address is required.
header of the packet. The source address is required so that the router
at the other end of the tunnel can send the packets back to the router
who tunnelled the packet.
2. Is it necessary to establish path between source andI don't think that's necessary. You could just tunnel the packet and
destination before configuring tunnel and use this path in routing
header of tunneled packet for forwarding the packet.
forward it as a normal IP packet. The tunnelled packet has the outer IP
header (tunnel IP header) which is sufficient to forward the packet
throughout the path.
3. I have one more doubt, when there is concept of fast path andI think, the tunnel processing (encapsulating the packet in another IP
slow path, which functionality of the tunnelling should go to the
fast path and which functionality of tunnelling should go to the
slow path.
header) should be done in slow path.
regards
Mukesh
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