[ECOS] question about bridging code.

["bill guckel" <bguckel at cisco dot com>]

Hello,
I'm hoping someone can answer a question about the function
bridge_input() in net/tcpip/current/src/sys/net/if_bridge.c.
Specifically:
        /*
         * Unicast, make sure it's not for us.
         */
        for (ifl = LIST_FIRST(&sc->sc_iflist);ifl; ifl =
LIST_NEXT(ifl,next)) {
                if (ifl->ifp->if_type != IFT_ETHER)
                        continue;
                ac = (struct arpcom *)ifl->ifp;
                if (bcmp(ac->ac_enaddr, eh->ether_dhost, ETHER_ADDR_LEN) ==
0) {
                        if (ifl->bif_flags & IFBIF_LEARNING)
                                bridge_rtupdate(sc,
                                    (struct ether_addr *)&eh->ether_dhost,
                                    ifp, 0, IFBAF_DYNAMIC);
                        m->m_pkthdr.rcvif = ifl->ifp;
                        return (m);
                }

My question concerns the the passing of 'ether_dhost' to
'bridge_rtupdate()'.
Why not 'ether_shost' ?  This would seem to me (not a bridging expert) be a
more important address to learn.  Note that I may be using old code since
it's been a while since I took new source.

thanks,
bill guckel


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