Incoming traffic on dual pppoe setup

My current setup:
- Dual pppoe (international vs local) on a linux server using my ADSL modem in bridged mode. Mostly as described in this thread: http://mybroadband.co.za/vb/showthread.php?t=71477
- The server has two interface cards (internal network and internet)
- I also make use of DynDNS and allow incoming connections for a web server. The web server listens for connections on the internal network only. Traffic from outside gets forwarded to this interface as needed.
- I'm using Linux iptables as firewall / router

My current problem is that if I only enable one pppoe account (international), I can connect to my server from outside (using DynDNS for name resolution), but as soon as I have both local and international accounts connected to the ISP I cannot connect to my web server at all.

I already confirmed the DynDNS entry, and this always points to my "international" IP, regardless if I have local connected or not, so I suspect that it has to do with either my routing in iptables, or the tcp routes which gets added in order to split local vs international traffic on the server.

I will investigate this more, but just wanted to know if anybody else has experienced a similar problem?

i've got the same issue.
i run a multiple-pppoe linux system, but also run a web server on that machine. clients which are not routed can't connect to me through one dynamic dns. would be cool to know how to allow all incoming traffic on an interface even if it doesn't have that respective outgoing route specified.