Terminal server with cyclades multiport card. Each port has his own options.ttyCx file with IP-Addr. pap-secret file contains multiple lines such as: * servername "" IP-Addr-1. * servername "" IP-Addr-2. etc. * servername "" IP-Addr-16. Insteat of best match (according to ppp docs) assigment of IP-Addrs starts with first, second, third IP-Addr. entry from pap-secret file and not according to options.ttyCx file. Same configuration in 5.1 works fine.
Please verify this with a newer version of Red Hat Enterprise Linux or Fedora Core and reopen it against the new version if it still occurs. Closing as "not a bug" for now.