Date: Thu, 24 Feb 2011 23:32:42 -0800 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Zhihao Yuan <lichray@gmail.com> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: How to bind a static ether address to bridge? Message-ID: <20110225073242.GA95375@icarus.home.lan> In-Reply-To: <AANLkTi=P6pbiPHWpeoj9Os%2Bfi76Hk7DFOyYaSN3BY=_J@mail.gmail.com> References: <AANLkTi=P6pbiPHWpeoj9Os%2Bfi76Hk7DFOyYaSN3BY=_J@mail.gmail.com>
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On Fri, Feb 25, 2011 at 12:56:55AM -0600, Zhihao Yuan wrote: > My server is behind a DHCP-enabled router, and it has two network > interfaces, wlan0 and bge0. I want to use them together, so I bind > them, plus tap0 to bridge0. But bridge has a random MAC address for > each time it was created, which makes me hard to reserve an IP for it > (since I need to forward some ports to this server). So I set > net.link.bridge.inherit_mac=1, which makes bridge0 to use bge0's MAC > address, always. But this causes another problem: the packets sent to > bridge0 is also sent to bge0, -- the packets are duplicated! The > kernel have to drop half of them. So how can I bind a distinct MAC > address to a bridge? I'm not trying to divert you from what you're trying to solve, but can you accomplish what you need without use of bridge(4)? I ask this because I just set up a home NAT router of my own which has 3 interfaces on it: em0 (WAN/connects to cable modem), em1 (LAN), and ath0/wlan0 (for wireless). I *explicitly* chose not to use bridge(4) because of the MAC address complications, and instead use two separate private networks (192.168.1.0/24 for em1 and 192.168.200.0/24 for wlan0). This works without any hitches, no MAC issues, etc.. -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP 4BD6C0CB |
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