Can't configure default gateway

This is my first post, so... be patience

I'm trying to configure my network...

internet--router--NETBSD

router gives to netbsd by dhcp the public ip that he
(router) colect 
with pppoa from my ISP.

on NETBSD the public ip is configured but the default
gateway is not.

an error "can't allocate llinfo", occurs.

I tried to see in mail archives, there are some posts about
this but I 
haven't seen the solution.

This network configuration works on linux and windows.

I kown that I'm doing something wrong...

Please give me a tip.

Just for the record: I leave windows, went to linux, and I
realy like 
NETBSD.