Using existing site-site vpn to route packet in PIX
I've setup a vpn using PIX from siteA(192.168.1.0) to siteB(192.168.2.0)
and from siteB(192.168.2.0 to siteC(192.168.3.0)
it is possible to for siteA to reach siteC without another VPN just by going through siteB?
how do i configure this in PIX?