On Wed, 20 Aug 2003, David S. Miller wrote: > On Wed, 20 Aug 2003 12:49:14 -0400 (EDT) > Bill Davidsen <davidsen@tmr.com> wrote: > > > On 19 Aug 2003, Daniel Gryniewicz wrote: > > > > I have been asking for a similar thing as well, David mentioned some > > things that would break, but I believe they break if you use source > > routing, so that seems not to be a real objection. > > It's not about source routing. It's about failover and being > able to use ARP on interfaces which don't have addresses assigned > to them yet. David mentioned that you could solve the problem by using *rp_filter and source routing. I don't think that's entirely true, but doing so has the same drawbacks and breaks the same things as a flag to make Linux behave like Sun/BSD/Windows (and work with Cisco is the cases previously mentioned). > > > I find it interesting that we can't change networking because a few > > complex systems would have to be reconfigured, but we *can* change modules > > which requires config changes on probably 90% of all systems (commercial > > distributions). > > Decisions about Networking will always be in a different domain > because the way one behaves has effects upon other systems not > just the local one. Yes, that's exactly the point, the way Linux works has bad effects on certain other machines, as in leaves them disconnected to the Linux system. > > BTW, another thing which makes the source address selection for > outgoing ARPs a real touchy area is the following. Some weird > configurations actually respond with different ARP answers based upon > the source address in the ARP request. You can ask Julian Anastasov > about such (arguably pathological) setups. > I don't think anyone is asking for a change in the default behaviour (although my point about breaking modules does apply), people would be satisfied, even ecstatic, if we had a simple way (flag) to set to make Linux work without setting /proc filters, using arpfilter, applying source routes (David's suggestion) and generally jumping through hoops. -- bill davidsen <davidsen@tmr.com> CTO, TMR Associates, Inc Doing interesting things with little computers since 1979. - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
