Internet access to qemu guest via bridge0

[Mayuresh <mayuresh%acm.org@localhost>]

I have done the guest and the host setup as described here and can network
both ways between a qemu guest and the host:
https://mail-index.netbsd.org/netbsd-users/2014/08/18/msg015139.html

The guest is just not able to access the external network. It has set the
host as default route. So host is blocking it in some way. How to
configure the host bridge so that the guest will be able get internet
access?

Mayuresh