apache bind to selected interfaces and to 127.0.0.1 ny default you can always access it by http://machine_name
or 127.0.0.1 (loopbackdevice)
if your eth0 have generic local network adderss (eg. 192.168.xxx or 10.something read RIPE ) and you not explictly added it to route table you also can always connect to this interface
post ifconfig / route before/after vpn.