ZTE Router, Internet (PPPoE) WAN port to SIP ATM PVC bridging
Here is my config:
I have ZTE ADSL 2+ router that has 4 ATM PVC's configured, but only 2 of them are important for problem description:
1st PVC is 8/35 and is ATM PVC for internet (PPPoE).
2nd PVC is 8/37 and is ATM PVC for voip.
When DSL link is up, I can get IPs on this two PVC's, and as a result of ifconfig command for this 2 PVC's I have:
ppp0 Link encap:Point-Point Protocol
inet addr:220.127.116.11 P-t-P:18.104.22.168 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1
RX packets:301298 errors:0 dropped:0 overruns:0 frame:0
TX packets:186824 errors:0 dropped:0 overruns:0 carrier:0
RX bytes:385395086 (367.5 MiB) TX bytes:14234288 (13.5 MiB)
nbif2 Link encap:Ethernet HWaddr 98:F5:37:FC:19:B5
inet addr:10.131.187.66 Bcast:10.131.255.255 Mask:255.254.0.0
UP BROADCAST RUNNING MULTICAST MTU:1492 Metric:1
RX packets:6204 errors:0 dropped:0 overruns:0 frame:0
TX packets:5815 errors:0 dropped:0 overruns:0 carrier:0
RX bytes:1398266 (1.3 MiB) TX bytes:1298854 (1.2 MiB)
Currently I can enter the nbif2 interface from LAN side (I added static route - 10.0.0.0/8 via 10.130.0.1 dev nbif2).
My question is - how can I forward port (eg. port 1234) on ppp0 interface to nbif2 interface, so I can communicate from internet connect to SIP server that is on nbif2 network?
I also attached picture of problem setup and available commands on the router.