You will need ppp and rp-pppoe packages. These still are not part of Owl, but you can get them from Gremlin's FTP server:
rpm -Uvh ftp://home.gremlin.ru/pub/linux/Owl/RPMS.i386/ppp-2.4.4-g1.i386.rpm rpm -Uvh ftp://home.gremlin.ru/pub/linux/Owl/RPMS.i386/rp-pppoe-3.8-g1.i386.rpm
Of course, you may just download them (say, using lftpget) and then install to another machine.
As root, run
pppoe-setup
It will ask you for
Enter your user name given by ISP
Enter the name of interface connected to your ISP's network or *DSL modem - for example, eth1
You definitely don't want to use it - so say no
Normally this should be left emply, thus telling PPPoE not to modify your /etc/resolv.conf - only in rare cases you may wish to enter server here for using peer-assigned DNS servers.
Enter your password given by ISP
Answer 0, thus telling PPPoE not to modify firewall rules.
Look at the summary of options you entered and confirm them.
Ethernet device must be in “up” state - use
ip link set dev eth1 up
to bring it up if necessary.
Once ethernet device is up (and, optionally, configured), use
pppoe-start
command to fire up the PPPoE link. This command may be issued from startup script - say, rc.local