Andy Gospodarek wrote: > On Wed, Mar 12, 2008 at 2:45 PM, Philip Prindeville > <philipp_subx@xxxxxxxxxxxxxxxxxxxxx> wrote: > >> Stephen Hemminger wrote: >> > On Wed, 12 Mar 2008 10:46:48 -0400 >> > "Andy Gospodarek" <andy@xxxxxxxxxxxxx> wrote: >> > >> > >> >> On Tue, Mar 11, 2008 at 11:29 PM, Philip Prindeville >> >> <philipp_subx@xxxxxxxxxxxxxxxxxxxxx> wrote: >> >> >> >>> Stephen Hemminger wrote: >> >>> > On Mon, 10 Mar 2008 11:05:53 -0700 >> >>> > Philip Prindeville <philipp_subx@xxxxxxxxxxxxxxxxxxxxx> wrote: >> >>> > >> >>> > >> >>> >> I'm using Linux 2.6.20 (yes, I'll be upgrading to 2.6.24 as soon as it's >> >>> >> stable). >> >>> >> >> >>> >> I have 4 VIA rhine ethernet controllers on my Soekris net5501, plus an >> >>> >> ADSL PCI card (a Sangoma S-518) that runs in AAL5-SNAP mode, so it looks >> >>> >> like an Ethernet controller. >> >>> >> >> >>> >> I'm trying to bridge eth0 and w1ad (the ADSL interface) into "br0". And >> >>> >> I'm trying to force the traffic on br0 to have the MAC address that my >> >>> >> ISP insists I use (i.e. that of the crappy little Westell 6100 modem >> >>> >> they sent me). >> >>> >> >> >>> >> The issue is the following. If I do: >> >>> >> >> >>> >> ifconfig w1ad down hw ether x:x:x:x:x:x up >> >>> >> >> >>> >> followed by either: >> >>> >> >> >>> >> brctl addbr br0 >> >>> >> brctl addif br0 eth0 >> >>> >> brctl addif br0 w1ad >> >>> >> >> >>> >> or: >> >>> >> >> >>> >> brctl addbr br0 >> >>> >> brctl addif br0 w1ad >> >>> >> brctl addif br0 eth0 >> >>> >> >> >>> >> the bridge ends up taking the MAC address of eth0 either way, which I >> >>> >> don't get (how does it decide which to use?). >> >>> >> >> >>> >> I can clone the same MAC address to both eth0 and w1ad, but I don't know >> >>> >> if that would cause me any problems or not (I haven't read the STP spec >> >>> >> in about 15 years). >> >>> >> >> >>> >> >> >>> > >> >>> > Having the same mac address on both just is going to be problematic (impossible >> >>> > to do STP), so don't if you don't have to. >> >>> > But you can set address of bridge and eth0 to any address you want. So set these >> >>> > to the ISP assigned address. You probably will have to do it after bridge >> >>> > is created. >> >>> > >> >>> > brctl addbr br0 >> >>> > brctl addif br0 w1ad br0 >> >>> > ifconfig eth0 hw ether x:x:x:x:x:x up >> >>> > ifconfig w1ad up >> >>> > ifconfig br0 hw ether x:x:x:x:x:x up >> >>> > >> >>> > ifconfig br0 A.B.C.D netmask 255.255.255.0 >> >>> > >> >>> >> >>> That seems to not work. I get: >> >>> >> >>> # ifconfig br0 hw ether "00:18:3A:55:15:35" >> >>> >> >>> ifconfig: SIOCSIFHWADDR: Cannot assign requested address >> >>> # >> >>> >> >>> Any ideas why? I'm doing this before an IP address has even been >> >>> assigned... >> >>> >> > >> > Assign the hardware address of the bridge was only added in later kernels. >> > >> >> Later being which kernel? >> > > It looks like this commit did it: > > commit 4505a3ef720845b5db3ddb440de13cd4800fd508 > Author: Stephen Hemminger <shemminger@xxxxxxxx> > Date: Wed Dec 21 18:51:49 2005 -0800 > > [BRIDGE]: allow setting hardware address of bridge pseudo-dev > > Some people are using bridging to hide multiple machines from an ISP > that restricts by MAC address. So in that case allow the bridge mac > address to be set to any of the existing interfaces. I don't want to > allow any arbitrary value and confuse STP. > > Signed-off-by: Stephen Hemminger <shemminger@xxxxxxxx> > Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> > > So that should mean it is in 2.6.15 and later (presuming this patch > added all the needed functionality). > Well, I don't get it then. I'm running Linux 2.6.20, with bridge-utils-1.2, and I'm still seeing it. Can you send me the link to the patch, and I'll make sure it's in my sources? Thanks, -Philip > >> And to answer the earlier question, I was doing: >> >> ifconfig brX down hw ether x:x:x:x:x:x up >> >> so yes, the interface was down when I tried to change its address. >> >> -Philip >> >> >> >> _______________________________________________ Bridge mailing list Bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/bridge
