> Aren't all stations in the same broadcast domain "supposed" to have > the same MTU, at least down at L2? So, a station in the broadcast > domain just doing IP and a station in the broadcast domain doing > IP+FCoE "should" have the same MTU at the HW level right? > > I could see where there would be lots of PMTU going-on if the > communications were to off-campus sites also had an FCoE upping their > MTU. Otherwise, the MSS exchange at connection establishment is going > to preclude it right? PMTU only "hits" when one has a so called > "dumb-bell" network which is "wider" at the ends than in the middle. Yes, I think such dumb-bell networks would be pretty common (servers in two different data centers with FCoE enabled, talking through an old-school WAN with 1500 MTU). And even if they're not as common I think, we probably do want to have some way to handle this. I'm probably not as up on old and/or obscure networking protocols, but to me FCoE is the first time I've been forced to think about coexistence of IP and non-IP protocols through the same netdev. - R. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
