Forwarding w/o promisc on 6.4
rwatson at FreeBSD.org
Sun Apr 19 09:14:20 UTC 2009
On Sun, 19 Apr 2009, Jon Otterholm wrote:
> I have a router running 6.4R that does not forward packets if I disable
> PROMISC on the interface. Hardware is a Dell PE with two Intel 82541EI
> chipsets (if_em). I have a number (~100) of vlan-interfaces on em0.
> Everything works as aexpected if I turn on PROMISC on em0 but forwarding
> stops if I disable it, I can still communicate with the router directly on
> the same logical network (for example pinging interface adress on a vlan_if
> from a client on that vlan) but all forwarding stops.
Try disabling hardware VLAN taggging/processing? I believe you should be able
to do this with "ifconfig em0 -vlanhwtag" (substituting appropriate interface
names). It could be there's a bug in how hardware-optimized tag handling is
being managed, as when promiscuous mode is used we re-insert vlan headers in
software for the benefits of BPF.
Robert N M Watson
University of Cambridge
> Some info:
> net.inet.ip.forwarding: 1
> net.inet.ip.fastforwarding: 0 (enableing this does not help)
> I use PF for filtering and disableing this does not help either.
> Anyone with a clue?
> freebsd-net at freebsd.org mailing list
> To unsubscribe, send any mail to "freebsd-net-unsubscribe at freebsd.org"
More information about the freebsd-net