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ISDN与AAA:呕心沥血之作

2019-11-04 20:59:03
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  一台3620上同时配置了8个口BRI和8个内置MODEM用作拔入。因为对公服务,安全性要求比较高,所以使用一台NT 运行 Cisco Secure 2.4 (ACS) 提供AAA服务(Authentication 认证,Authorization 授权,Accounting记帐)。
  
  PSTN 和AAA的集成没有问题,很轻易就实现了。
  
  ISDN 拔号要实现授权不同于PSTN,根据CISCO的文档,必须要用Per-User的AAA设置方法(不能通过Group设置用户)和配置Virtual PRofile.
  
  由于没有较好的范例可以借鉴,只能通过观察debug ppp negotiation, debug authentication, debug aaa authorization 等命令的输出来摸索配置方法,所以这个配置至少花掉我24个小时,可谓呕心沥血之作。
  
  曾经在这发过贴子问,没人回答,现在解决方法贴出来,供大家参考。
  
  本例中,当用户user1通过pstn/isdn拔入时,AAA服务器指示(授权)NAS(拔号访问服务器,即3620)对该用户应用access-list 101.
  
  ! 3620 配置 (摘要)
  
  aaa new-model
  aaa authentication login default group tacacs+ local
  aaa authentication login no_tacacs enable
  aaa authentication ppp default group tacacs+
  aaa authorization network default group tacacs+
  aaa accounting network default start-stop group tacacs+
  enable secret 5 $1$FdxlnA$pGA5cPuIqOOJwFT0iLWq0
  !
  username localuser passWord 0 _password
  ip subnet-zero
  !
  !
  no ip finger
  no ip domain-lookup
  !
  virtual-profile virtual-template 1
  virtual-profile aaa
  isdn switch-type basic-net3
  !
  !
  !
  interface FastEthernet0/0
  ip address 10.1.10.33 255.255.255.0
  duplex auto
  speed auto
  !
  interface BRI1/0
  ip unnumbered FastEthernet0/0
  encapsulation ppp
  no ip route-cache
  no ip mroute-cache
  no keepalive
  dialer-group 1
  isdn switch-type basic-net3
  peer default ip address pool ip_pool
  no fair-queue
  ppp authentication chap pap
  ppp multilink
  !
  interface BRI1/1
  ip unnumbered FastEthernet0/0
  encapsulation ppp
  no ip route-cache
  no ip mroute-cache
  no keepalive
  dialer-group 1
  isdn switch-type basic-net3
  peer default ip address pool ip_pool
  no fair-queue
  ppp authentication chap pap
  ppp multilink
  !
  ...
  interface Virtual-Template1
  ip unnumbered FastEthernet0/0
  peer default ip address pool ip_pool
  ppp authentication chap pap
  ppp multilink
  ppp timeout idle 300
  !
  interface Group-Async0
  ip unnumbered FastEthernet0/0
  encapsulation ppp
  ip tcp header-compression passive
  async dynamic routing
  async mode interactive
  peer default ip address pool ip_pool
  ppp authentication chap pap
  group-range 65 80
  !
  
  ip local pool ip_pool 10.1.10.1 10.1.10.32
  ip classless
  ip route 0.0.0.0 0.0.0.0 10.1.10.34
  no ip http server
  !
  access-list 101 deny icmp any host 10.1.11.1 log
  access-list 101 permit ip any any
  dialer-list 1 protocol ip permit
  tacacs-server host 10.1.10.36 single-connection
  tacacs-server key _key
  
  !
  line con 0
  login authentication no_tacacs
  transport input none
  line 65 80
  autoselect during-login
  autoselect ppp
  modem InOut
  modem autoconfigure discovery
  transport input all
  stopbits 1
  flowcontrol hardware
  
  ! ACS 配置 (用户):
  设定密码,指定IP分配方法;选中PPP IP, INACL设为101,选中MULTILINK,LCP.


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