-----Urspr|ngliche Nachricht----- Von: "Melameth, Daniel D." <[EMAIL PROTECTED]> Gesendet: 21.04.06 15:02:34 An: <misc@openbsd.org> Betreff: Re: advantages/disadvantages of kernel pppoe(4) vs userland pppoe(8)?
Jonathan Thornburg wrote: > The firewall/router/nat box is (will be when I get this setup) > an old 486 laptop with 2 pcmcia ethernet cards, running 3.9-stable. > (Yes, I've ordered a CD; until it arrives I'm using 3.8-stable.) > > I already have the (external) DSL modem, and from talking to other > Unix-savvy customers of my ISP (arcor.de), their setup is that the > DSL modem talks pppoe to me (in this case to my firewall/router/nat > box). From looking at the FAQ section 6, it seems I have two basic > options available doing this in OpenBSD: pppoe(4) in the kernal, and > pppoe(8) in userland. My question is, what are the relative > advantages/disadvantages of these? > > The obvious tradeoff is performance: I expect pppoe(8) to be slower > due to the extra kernel/user-space crossings for each packet. My > ADSL is 6M bits/sec downstream, 0.5M upstream. > > But are there other significant differences in > * support for pppoe features? > * ease of configuration? > * reliability? As someone who also use an old laptop for this purpose, a 486, PCMCIA cards and user mode pppoe will likely not allow you to achieve your full 6Mbps speeds. Since I've never used user mode pppoe, I can't comment on the differences, but as a kernel mode user I can say the configuration is very simple and well documented and the "reliability issues" that plagued 3.7 are gone in 3.8. hi i also customer of arcor and an wrap embedded router ( take a look at www.pcengines.ch ) your laptop should be powerful enough for router / dhcp server / caching dns server and dyndns client too . i use the kernel pppoe right now and at the past the userland pppoe. from my feeling are the kernel pppoe faster an more lightweight as the userland pppoe. just you have to care about mtu/mss size at the firewall-code and by sysctl for the fullspeed. ( i think this is the biggest diffrence to the userland pppoe ) i work with this setup since months with any kind of trouble. holger
