The point in all this is to reduce administration on my hand and in some cases to offer a service to customers with the feeling that they reside "on the same layer".
Today I'm routing the traffic. Alcatels soloution to this is to put an ARP-proxy in a Cisco-router. I cannot understand why Alcatel has put this limitaion in their DSLAM's. Their answer is that it prevents spoofing. I would accept this as a feature but not as a limitation... /J On Thu, 2005-11-10 at 13:39 +0000, Brian Candler wrote: > On Thu, Nov 10, 2005 at 02:25:07PM +0100, Jon Otterholm wrote: > > In all this - our role is similar to an ISP, but we are buying access to > > our customers from an external part. Every customer is delivered on a > > separate vlan trunked. > > > > - Our DSL customers cannot be set on the same VLAN i a single DSLAM > > (don't ask me why - ask Alcatel). > > - We cannot build a simple bridge because the Network service provider > > can't handle when a MAC-address shows up on 2 different VLAN's. > > > > The arp-proxy should do the following: > > - Forward any broadcast packets but rewrite src to its own mac. > > - Forward unicast packets according to FDB but rewrite src to its own > > mac. > > Can you not perform normal routing - that is, allocate a separate IP subnet > to each VLAN? This uses some more IPs than a 'flat' addressing space, but > it's guaranteed to work properly. > > If your DSL traffic is presented as PPPoE, maybe you can get away with just > having a separate PPPoE listener on each VLAN. If it's presented as L2TP you > could use private IPs for the tunnel endpoints. > > Otherwise, a bridge which rewrites source MAC addresses as packets pass > through - that's just too awful to contemplate. As you say, you'd also have > modify ARP responses to have the bogus MAC addresses too. Dealing with > multicast, IGMP, Netbios... no I really don't want to contemplate it :-) > > Regards, > > Brian. _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"
