PPPoE Multiwan

gistfile1.sh

# Dial
pppoecd vlan2 -u $user -p $password # wan1
pppoecd vlan2 -u $user -p $password # wan2

# Handle outgoing packet
# Make "ip route" contains a default route like this

# "ip route" final state
#default
#        nexthop via $wan1_ip  dev $wan1_dev weight 1 # such as 202.106.0.24 ppp0
#        nexthop via $wan2_ip  dev $wan2_dev weight 1

# action
ip route replace default scope global equalize nexthop via $wan1_gw dev $wan1_dev weight 1 nexthop via $wan2_gw dev $wan2_dev weight 1

# Handle incoming packet
# Make "ip rule" contains rule to dispatch incoming packet to correct routing table

# "ip rule" final state
# 0:    from all lookup local
# 50:   from $wan1_ip lookup $wan1_rt #50, 100, 150, 200 is just a number to ensure order
# 100:  from $wan2_ip lookup $wan2_rt
# 32766:  from all lookup main
# 32767:  from all lookup default

# action
ip rule flush
ip rule add lookup main prio 32766
ip rule add lookup default prio 32767
ip rule add from $wan1_ip table 50 prio 50
ip rule add from $wan2_ip table 100 prio 100

# Make "ip route show table $wan1_rt" contains correct routes

# $wan1_range dev pppoe-wan  scope link src $wan1_ip #such as 202.106.0.0/24 for 202.106.0.20
# 127.0.0.0/8 dev lo  scope link
# default via $wan1_gateway dev $wan1_dev #such as 202.106.0.1 for 202.106.0.20

ip route add $wan1_range dev $wan1_dev src $wan1_ip table 50
ip route add "127.0.0.0/8" dev "lo" table 50
ip route add default via $wan1_gw table 50

# Setup NAT from LAN to WAN