On 2009-05-29, Scott McEachern <sc...@erratic.ca> wrote: > > So the specifics for OpenBSD is that this is completely do-able with > userland pppoe. Keep the existing pppoe setup for the single IP as is, > and just modify the /etc/ppp/ppp.linkup file as such: (Assuming you > were given a.b.c.d/30) > > MYADDR: > !bg sh -c "/sbin/ifconfig tun0 alias a.b.c.d netmask 255.255.255.255" > [...] > !bg sh -c "/sbin/ifconfig tun0 alias a.b.c.d+3 netmask 255.255.255.255" > !bg sh -c "/sbin/pfctl -ef /etc/pf.conf" > !bg sh -c "pkill -1 named"
where you have a single address and also a routed subnet, the normal way to do this is to put those IPs on another network interface. but with something small like a /30, assuming you just want them for natting and not passing directly to another machine, this is a good way to make use of the extra addresses that you normally wouldn't be able to. > > The last two lines are to load a pppoe-aware pf.conf and to let the > name server start listening on any external address per named.conf. > The result is that adding a /30 actually gives a total of 5 usable > IPs: the original IP, what you would think are the 'network' and > 'broadcast' addresses for the /30, plus the two 'normal' usable addresses. > After that, it was just a matter of myself and pf.conf having a chat, > and all is well. :)
