Pppoe change peer address

[tonysud]

I have the WAN interface with pppoe connecting to my ISP

I'd like to change the peer IP address (not mine)

for example:
mine ip (dynamic ip): 79.62.100.120
peer ip: 192.168.100.1

I'd like to change 192.168.100.1 to 192.168.100.30

with FreeBSD, modifying ppp.conf I can do this, with pfsense I don't know how to modify this setting

please help me
thanks

[grandrivers]

make your mpd.conf file place it in cf/conf/  pfsense will use it if named correctly

[tonysud]

at the moment I have two file:
/var/etc/mpd_opt1.conf
/var/etc/mpd_opt2.conf

How can I do to modify these files?
which name the should have?