s4@s4:~$ cat /etc/network/interfaces
# interfaces(5) file used by ifup(

and ifdown(

auto lo
iface lo inet loopback
auto dsl-provider
iface dsl-provider inet ppp
pre-up /sbin/ifconfig eth1 up # line maintained by pppoeconf
provider dsl-provider
auto eth0
iface eth0 inet manual
auto eth1
iface eth1 inet static
address 192.168.137.1
netmask 255.255.255.0
auto ppp1
iface forts inet ppp
provider forts
up route add-host 91.208.232.208 gw 10.87.255.254
post-up ip route add 239.192.7.27 via 1.1.1.1 dev ppp1
post-up ip route add 239.192.135.27 via 1.1.1.1 dev ppp1
up ip route add 224.0.0.22 via 1.1.1.1 dev ppp1
up ip route add 172.27.0.0/24 via 1.1.1.1 dev ppp1
up ip route add 239.0.0.0/8 via 1.1.1.1 dev ppp1