NetBSD with a default gateway on a different subnet

[Philip Dodd <philip.dodd%free.fr@localhost>]

Hi,

I'm trying to get NetBSD running as a domU on a Debian dom0 now, and 
I'm having difficulty getting the NetBSD network interface working.

The rather special setup that my hoster provides has a failover IP that 
is supposed to be used with a 255.255.255.255 mask and a specific 
virtual MAC, and which is on a different subnet than the physical 
machine for the virtual machines.  This means tweaking the routing.  On 
a linux domU, this works :

route add -host default_gateway_of_dom0 dev eth0
route add default gw default_gateway_of_dom0

but looking at the NetBSD FAQ and a bit of googling I came up with the 
following :

route add -host default_gateway_of_domO -link xennet0 -iface
route add default -ifa domU_ip default_gateway_of_dom0

which doesn't work - I can't ping the gateway.

I realise the setup is a little strange, and I first suspected the 
bridging on my dom0, but the linux domU served to confirm that that part 
(at least!) I seem to have got right :)  I could so no other particular 
difference, other than the broadcast address which defaulted to 
WWW.255.255.255 on linux and to WWW.XXX.YYY.ZZZ on NetBSD.  I tried 
setting broadcast to WWW.255.255.255 on NetBSD, but that seemed to make 
no difference.

Any help or ideas are most welcome,

Thanks,

Philip