Thanks for the quick help.
Good example of UDP.
So in case of TCP, client which tries to connect to the server, should provide
its link-local source address during socket(), bind() calls. Based on that IPv6
stack will figure out the out-going interface.
Is that correct understanding?
Regards,
Parav Pandit
--- On Wed, 4/14/10, Mohacsi Janos <moha...@niif.hu> wrote:
From: Mohacsi Janos <moha...@niif.hu>
Subject: Re: which interface to choose to send to destination link-local
address - any RFC?
To: "Parav Pandit" <paravpan...@yahoo.com>
Cc: ipv6@ietf.org
Date: Wednesday, April 14, 2010, 3:01 PM
On Wed, 14 Apr 2010, Parav Pandit wrote:
> Hi,
>
> In IPv6 stack implementation,
>
> How IPv6 stack should select the outgoing interface to choose (when multiple
> interfaces) are available?
> Typically when the destination is the link-local address which may be on-link
> on both the interfaces (before
> the neighbor discovery) is done?
>
> Should IPv6 stack do Neighbor discovery on all multiple interfaces in the
> host?
>
> Which RFC defines this behavior? I referred RFC 3484 (Default Address
> Selection for IPv6) but doesn't seem to
> define this.
>
> I hope I am asking on the right mailing list. If not please divert me to the
> correct one.
The application should know which interface/link to choose in case of
link-local address. The link-local is relevant to a specific link only.
e.g.
ping6 -I bge0 fe80::21b:63ff:fe9f:4527
PING6(56=40+8+8 bytes) fe80::206:5bff:fef2:41c1%bge0 -->
fe80::21b:63ff:fe9f:4527
16 bytes from fe80::21b:63ff:fe9f:4527%bge0, icmp_seq=0 hlim=64 time=7.292 ms
16 bytes from fe80::21b:63ff:fe9f:4527%bge0, icmp_seq=1 hlim=64 time=0.656 ms
^C
--- fe80::21b:63ff:fe9f:4527 ping6 statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 0.656/3.974/7.292/3.318 ms
ping6 fe80::21b:63ff:fe9f:4527
ping6: UDP connect: Network is unreachable
If the application knows which link to use then IPv6 protocol stack might use
ND to dicover/reach the node.
Best Regards,
Janos Mohacsi
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