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    SubjectRe: [patch v2, kernel version 3.2.1] net/ipv4/ip_gre: Ethernet multipoint GRE over IP
    Dňa 17. januára 2012 10:50, David Lamparter <equinox@diac24.net> napísal/a:
    > On Mon, Jan 16, 2012 at 11:52:25PM +0100, Štefan Gula wrote:
    >> Dňa 16. januára 2012 21:29, David Lamparter <equinox@diac24.net> napísal/a:
    >> > At the risk of repeating myself, Linux GRE support already has
    >> > provisions for multipoint tunnels. And unlike your code, those reuse the
    >> > existing neighbor table infrastructure, including all of its user
    >> > interface and introspection capabilities.
    >> >
    >> > It's actually slightly visible in your patch:
    >> >
    >> > On Mon, Jan 16, 2012 at 08:45:14PM +0100, Štefan Gula wrote:
    >> >> +++ linux-3.2.1-my/net/ipv4/ip_gre.c  2012-01-16 20:42:03.000000000 +0100
    >> >> @@ -716,7 +942,19 @@ static netdev_tx_t ipgre_tunnel_xmit(str
    >> > [...]
    >> >>               /* NBMA tunnel */
    >> >>
    >> >>               if (skb_dst(skb) == NULL) {
    >> >
    >> >
    >> > -David
    >>
    >> That code you are referring to is used only for routed traffic inside
    >> GRE - L3 traffic over L3 routed infrastructure. My patch is dealing
    >> with L2 traffic over L3 routed infrastructure - so the decision here
    >> is based on destination MAC addresses and not based on IPv4/IPv6
    >> addresses.
    >
    > Yes, it currently only does IPv4/IPv6 -> IPv4 through the neighbor
    > table. That doesn't mean it can't be extended to handle ethernet
    > addresses the same way.
    >
    >
    > -David

    Routing mechanisms and switching mechanisms works completely
    different, in switching you simply don't have anything like next-hop
    from routing, which can be resolved by utilizing modified ARP message
    and there is also absolutely no hierarchy in MAC address (like you
    have in routing table), so I seriously doubt that it can be done the
    same way, but I am opened to ideas here. So how would you do like to
    do that?
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