On Tue, Jan 25, 2005 at 10:43:01AM -0800, Rich Wales wrote: > I'm running 5.3-RELEASE-p5 on a system that is functioning as a > NAT router/firewall using "pf". It works just fine, but . . . . > > The external (Internet) network connection is giving me incoming > traffic addressed to other users all over my neighborhood (not > just the packets intended for me). The external NIC (an Accton > MPX 5030/5038, handled via the "rl" driver) appears to be running > promiscuously; it's accepting all these incoming packets, whether > addressed to me or not. > > The flags shown for the NIC by the "ifconfig" command are: > > rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 > > Note that the PROMISC flag is =not= set, but the NIC seems to > be acting in a promiscuous fashion nevertheless. > > Although my firewall (an old 800-MHz Athlon system) is able to > handle this extra load, I'd really like to configure it so that > the packets not intended for my site are silently dropped and > never seen by FreeBSD at all. (Aside from simple neatness, I'm > aware of the failings of the RealTek 8129/8139 and am hoping to > reduce overhead by filtering out the extraneous traffic before > the driver would see it.) > > Any suggestions as to what I should do? Or is what I'm asking > simply impossible (and if so, why)? Thanks for any help.
Without a dump of the traffic I can't really say what you're seeing, but on a broadcast network like Ethernet of any size containing windows machines, half a dozen packets per second of broadcast noise is pretty normal. Are the packets addressed to your MAC address, but to another non-broadcast IP? I can conceive of configurations bugs in emulated broadcast domains that could cause that. If so it's an interesting bug in your ISPs config. If not, you may have found a bug in your NICs driver or it's chipset/firmware. -- Brooks -- Any statement of the form "X is the one, true Y" is FALSE. PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4
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