Cisco 2901 3G 設定

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1. 建立撥接
    cisco2901(config)#chat-script gsm1 "" "ATDT*99*1#" TIMEOUT 60 "CONNECT"

2. Cellular 0/1/0 configurations
    cisco2901(config)#interface Cellular0/1/0
    cisco2901(config-if)#ip address negotiated
    cisco2901(config-if)#ip nat outside
    cisco2901(config-if)#no ip virtual-reassembly in
    cisco2901(config-if)#encapsulation PPP
    cisco2901(config-if)#dialer in-band
    cisco2901(config-if)#dialer string gsm1                    "<------Again uses the chat-script"
    cisco2901(config-if)#dialer-group 1                          "<------References the dialer-list (interesting traffic)"
    cisco2901(config-if)#async mode interactive
    cisco2901(config-if)#ppp chap hostmame abc          "<------Username and password is required"
    cisco2901(config-if)#ppp chap password 0 1234      "<------Local or Providers APN"
    cisco2901(config-if)#ppp ipcp dns request

3.
    cisco2901(config)#ip route 0.0.0.0 0.0.0.0 Cellular0/1/0
    cisco2901(config)#ip nat inside source list 1 interface Cellular0/1/0 overload
    cisco2901(config)#access-list 1 permit any
    cisco2901(config)#dialer-list 1 protocol ip permit    "<------Specifies interesting traffic to bring up the dialer"

4. line information configurations
    cisco2901(config)#line 0/0/1
    cisco2901(config-line)#exec-timeout 0 0
    cisco2901(config-line)#script dialer gsm1                "<------Calls the chat-script"
    cisco2901(config-line)#modem InOut                      "<------allows incoming and outgoing call"
    cisco2901(config-line)#no exec
    cisco2901(config-line)#transport input all
    cisco2901(config-line)#transport output all

5. Creating a Modem Profile(中華電信 SIM)：
  cisco2901#cellular 0/1/0 gsm profile create 1 internet chap abc 1234
    PS：
    APN (Access Point Name)：中華 SIM：internet；遠傳 SIM：fetims

6. 啟動 3G SIM 使用 ping
    cisco2901#ping 8.8.8.8