Multiple pppoe client connection

I have problem with configuration of home network. Basically I use router TP-Link wr1043nd v.1.0 with DD-WRT v3.0-r29621 (05/10/16). My provider change connection method from static IP to authorized via pppoe. I have inteal and exteal IP. My whole home network will use inteal IP and I'll use exteal in some cases like Virtual Box with Linux system.

Right now my configuration looks like:

ppp0 Link encap:Point-to-Point Protocol inet addr:10.20.8.139 P-t-P:194.63.133.14 Mask:255.255.255.255 UP POINTOPOINT RUNNING MULTICAST MTU:1492 Metric:1 RX packets:134643 errors:0 dropped:0 overruns:0 frame:0 TX packets:52198 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:175515440 (167.3 MiB) TX bytes:5004199 (4.7 MiB)

1) Add new alias (like ppp0.0) for exteal IP:

ifconfig ppp0:0 XXX.XXX.XXX.XXX pointopoint YYY.YYY.YYY.YYY up

it is correct ?

2) set user and password like second

How to do this ?

Regards, Nerus.

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