I've got the following problem running pppd 2.3.10-3 on RedHat 6.1, Kernel 2.2.12-20 or 2.2.16-21 (Reviewing bugreports I found one more mentioning of the same problem by peter in bug ID6295, but not answered) So the problem: There is a host connected to a LAN/WAN via Ethernet having a modem (ppp server). It's IP is N. The remote host connecting via modem line has no other connections and pretend to use IP M. (M is a legal IP on the same subnet as N known by DNS and not used by any machine) So on server side /etc/ppp/options contains addresses N:M. On the client side - just the reverse M:N. (no other options files exist, command line options aren't used) pppd is suid root, so it can and it does read /etc/ppp/options (I'm sure it does because other options like debug,proxyarp, noauth are working) When I start pppd on server as root - everything works fine. But if I start pppd on server as ordinary user ppp0 interface on server is getting IP address N+1 (!!!). And that cause a trouble on the LAN - it's an IP of other running machine. What is the reason? Why it ignores an IP given in options file and use some other of it's own choice? Even if setting IPs is a priveleged option (which seems not to be the case according to man page) it's coming from a priveleged source - it should work...
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.