Configuring 2nd WAN interface (Access to provider's LAN)

[vplessky]

Hello,

Does someone has experience configuring 2nd WAN interface (Access to provider's LAN), using Gargoyle/OpenWrt?

Web interface doesn't have such option.

Native firmware from TP-Link (tested WR1043ND) have such option.
I just activate (set checkmark 2nd WAN interface: Enabled) it in Web UI, enter Static IP address and Gateway.
This works with stock firmware.

Some vendors (like D-Link) call this functionality DualAccess.
But in fact this is about adding 2nd logical WAN interface to existing 1 physical WAN port.

Settings working with stock firmware:

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Static IP:  10.5.72.183
Netmask: 255.255.255.0
Gateway: 10.5.72.254

Gargoyle Router has IP address 192.168.1.3, LAN Gateway 192.168.1.3
Internet Connection uses PPPoE.

With stock firmware and 2nd WAN interface enabled, I am connected directly to provider's LAN / gateway

With Gargoyle router, route goes via PPPoE server

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>tracert 10.5.72.254

Трассировка маршрута к 10.5.72.254 с максимальным числом прыжков 30

  1    <1 мс    <1 мс    <1 мс  Gargoyle.lan [192.168.1.3]
  2     1 ms    <1 мс    <1 мс  b3-Sinichkina-11.ti.ru [212.1.254.106]
  3     *        *        1 ms  212.1.251.77
  4     *        1 ms     1 ms  10.5.72.254

Трассировка завершена.

With DD-Wrt running on another router, direct connection to provider's LAN was also working.
I was using following scripts:

Startup
----------------

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ifconfig vlan1 down
ifconfig vlan1 10.5.72.183 netmask 255.255.255.0
ifconfig vlan1 up

route add -net 10.0.0.0 netmask 255.0.0.0 gw 10.5.72.254
route add -net 212.1.224.0 netmask 255.255.255.0 gw 10.5.72.254
route add -net 212.1.226.0 netmask 255.255.255.0 gw 10.5.72.254

Firewall
------------------

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iptables -A FORWARD -s 192.168.1.0/24 -j ACCEPT
iptables -A FORWARD -d 192.168.1.0/24 -j ACCEPT
iptables -t nat -A POSTROUTING -o vlan1 -s 192.168.1.0/24 -j MASQUERADE

I would appreciate your tips what is the easiest and most efficient way to implement this in Gargoyle/OpenWrt.