iproute2 has a command that perhaps could help you.
ip route add default scope global equalize nexthop dev ppp0 \ nexthop dev ppp1
(actually if you know peer addresses of ppp* use it instead).
I've never tried with it but it´s a possibility.
You have to have two NIC in your web server; replace ppp0 and ppp1 with eth0 and eth1. Also have a look to Alexey iproute2 because he says that this command equalize load through the 2 NIC. Connect each NIC to each incoming line using 2 different address space.
Give a feedback telling us your experiences.
Best regards,
Leonardo Balliache
