The problem is that DSL around here is PPP over Ethernet, rather than just plain Ethernet. So there's no MII, no ARP, no regular ethernet link bonding. It's hard to escape PPPoE for DSL around here due to phone company politics.

The type of bonding I talked about in the article was all PPP link bonding, which apparently still has a lot of issues to work out in Linux. Our two-line bond was pretty unreliable, and our attempts at a three-line bond ended up with a lot of return packets going nowhere. Didn't matter which lines we picked, either.