Lucio de Re wrote:
> Destination     Gateway            Flags     Refs     Use    Mtu  Interface
> default         192.168.30.17      UGS         0        0      -  ppp0

  I think the following:

    route_output()                                           net/rtsock.c
     rtrequest(,0.0.0.0,192.168.30.17,,,)                    net/route.c
      ifa_ifwithroute(RTF_GATEWAY,0.0.0.0,192.168.30.17)     net/route.c
       ifa_ifwithdstaddr(192.168.30.17) = 0                  net/if.c
       ifa_ifwithnet(192.168.30.17)                          net/if.c

    Maybe, ifa_ifwithnet() returns ifa with ppp0.

  For example, ifa_ifwithnet() in FreeBSD does not match the address
  using netmask. Therefore, the ifa_ifwithnet() will find "ne1".
  It has an exact match only for point-to-point interface:

  === FreeBSD ifa_ifwithnet() ===
        for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next) {
                for (ifa = ifp->if_addrhead.tqh_first; ifa;
                     ifa = ifa->ifa_link.tqe_next) {
                        register char *cp, *cp2, *cp3;

                        if (ifa->ifa_addr->sa_family != af)
next:                           continue;
!                       if (ifp->if_flags & IFF_POINTOPOINT) {
!                               /*
!                                * This is a bit broken as it doesn't
!                                * take into account that the remote end may
!                                * be a single node in the network we are
!                                * looking for.
!                                * The trouble is that we don't know the
!                                * netmask for the remote end.
!                                */
!                               if (ifa->ifa_dstaddr != 0
!                                   && equal(addr, ifa->ifa_dstaddr))
!                                       return (ifa);
!                       } else {
                                ....
!                       }
                }
        }
        return (ifa_maybe);

P.S.
Ignatios Souvatzis:
> There is your problem.
> 
> Our (or any BSD) kernel doesn't support multiple equal routes in-kernel, as
> far as I understand. You want to remove the ppp0 route to make it find the ne1
> one.

  This is an UNNUMBERED (point-to-point) interface.
===
Massa. Hatanaka                Fujitsu Limited, Japan
E-Mail: hatanaka@open.nm.fujitsu.co.jp