PPPD - Unauthorized remote IP address ??

[root]

zdravim a prosim o radu

snazim se dva pocitace spojit pomoci modemu a PPP. na obou bezi RH >6.0
a pppd-2.3.11

pocitace se spoji, totoznost se pomoci PAP take overi, login probehne,
ale pak se obevi hlaska ze $SUBJ a spojeni je ukonceno.

posledni nastaveni, ktere jsem na serveru zkousel je toto:
    na serveru (kam se pripojuju): pppd -detach
192.168.50.201:192.168.50.1 modem crtscts lock auth -chap +pap login

  na stanici ze ktere se pripojuju spoustim: pppd -detach /dev/... lock
modem noipdefault user ...

motam se v tom uz dost dlouho, a nevim proc mi neustale tvrdi, ze adresa
je unauthorized

tak a takhle je to porad dokolo >>>>

Using interface ppp0
Connect: ppp0 <--> /dev/ttyS1
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x2f7d7907> <pcomp>
<accomp>]
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x2f7d7907> <pcomp>
<accomp>]
rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <auth pap> <magic 0x66b172d2>
<pcomp> <accomp>]
sent [LCP ConfAck id=0x1 <asyncmap 0x0> <auth pap> <magic 0x66b172d2>
<pcomp> <accomp>]
sent [LCP EchoReq id=0x0 magic=0x2f7d7907]
sent [PAP AuthReq id=0x1 user="buba" password=<hidden>]
sent [PAP AuthReq id=0x2 user="buba" password=<hidden>]
rcvd [PAP AuthAck id=0x2 "Login ok"]
Remote message: Login ok
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <compress VJ 0f 01>]
rcvd [IPCP ConfReq id=0x1 <addr 192.168.50.201> <compress VJ 0f 01>]
sent [IPCP ConfAck id=0x1 <addr 192.168.50.201> <compress VJ 0f 01>]
rcvd [IPCP ConfNak id=0x1 <addr 192.168.50.1>]
sent [IPCP ConfReq id=0x2 <addr 192.168.50.1> <compress VJ 0f 01>]
rcvd [IPCP ConfAck id=0x2 <addr 192.168.50.1> <compress VJ 0f 01>]
Peer is not authorized to use remote address 192.168.50.201
sent [IPCP TermReq id=0x3 "Unauthorized remote IP address"]
rcvd [IPCP TermAck id=0x3]
sent [LCP TermReq id=0x2 "No network protocols running"]
rcvd [LCP TermAck id=0x2]
Connection terminated.
Connect time 0.2 minutes.
Sent 229 bytes, received 179 bytes.
tcflush failed: Nepoípustný argument