sample LNS config. pt. cisco:
!
!
!
vpdn enable
!
!
! in continuare se configureaza mai multe capete de tunel, pentru 
! ca exista mai multe LAC-uri, dupa urmatorul exemplu:
!
!
!
vpdn-group 1
 accept-dialin
  protocol l2tp
  virtual-template 1
 terminate-from hostname bu-psd1
 lcp renegotiation on-mismatch
 l2tp tunnel hello 0
 l2tp tunnel password 3g
 l2tp tunnel timeout no-session never
 l2tp tunnel nosession-timeout 0
 ip mtu adjust
!
vpdn-group 2
 accept-dialin
  protocol l2tp
  virtual-template 1
 terminate-from hostname bu-psd2
 lcp renegotiation on-mismatch
 l2tp tunnel hello 0
 l2tp tunnel password 3g
 l2tp tunnel timeout no-session never
 l2tp tunnel nosession-timeout 0
 ip mtu adjust
!
vpdn-group 3
 accept-dialin
  protocol l2tp
  virtual-template 1
 terminate-from hostname bu-psd3
 lcp renegotiation on-mismatch
 l2tp tunnel hello 0
 l2tp tunnel password 3g
 l2tp tunnel timeout no-session never
 l2tp tunnel nosession-timeout 0
 ip mtu adjust
!
vpdn-group 4
 accept-dialin
  protocol l2tp
  virtual-template 1
 terminate-from hostname bu-psd4
 lcp renegotiation on-mismatch
 l2tp tunnel hello 0
 l2tp tunnel password 3g
 l2tp tunnel timeout no-session never
 l2tp tunnel nosession-timeout 0
 ip mtu adjust
!
vpdn-group 5
 accept-dialin
  protocol l2tp
  virtual-template 1
 terminate-from hostname bu-psd5
 lcp renegotiation on-mismatch
 l2tp tunnel hello 0
 l2tp tunnel password 3g
 l2tp tunnel timeout no-session never
 l2tp tunnel nosession-timeout 0
 ip mtu adjust
!
vpdn-group 6
 accept-dialin
  protocol l2tp
  virtual-template 1
 terminate-from hostname bu-psd6
 lcp renegotiation on-mismatch
 l2tp tunnel hello 0
 l2tp tunnel password 3g
 l2tp tunnel timeout no-session never
 l2tp tunnel nosession-timeout 0
 ip mtu adjust
! se conf. interfata de dialin
!
!
!
interface Virtual-Template1
 ip unnumbered FastEthernet0/0 (sau interfata conectata spre Intranet)
 ppp accm 0
 ip tcp adjust-mss 1320
 peer default ip address pool ZAPP-POOL
 ppp authentication chap
 no keepalive
 no ip tcp header-compression
 no compress
 ppp ipcp dns a.b.c.d (adresa IP a serverului DNS propriu)
!
!
!se adauga un pool local de adrese ip ce se vor aloca userilor conectati dinspre
!tel. mobile
!
ip local pool ZAPP-POOL 1.1.1.1 1.1.1.254
!
!
!se poate crea un user pt. teste (ulterior se poate folosi AAA-ul propriu)

username test@your-company-realm password test
!
!
!la Zapp este deja provizionat realm-ul @your-company-realm cu
!LNS=your.public.ip.addr
!
!Routerul are nevoie de acces internet cu porturile 
!1701/udp si 13660/udp in ambele sensuri (incoming si outgoing)