Cisco 3G GSM + GRE Config

• Cisco/Gsm3G/Old2012 Older config with dialer, dialer not needed

• Need to add IPSec see http://www.cisco.com/en/US/docs/ios-xml/ios/sec_conn_ike2vpn/configuration/15-2mt/sec-flex-spoke.html

• Cisco 3G cellular modem reset / power-cycle

  •  #test cellular 0/3/0 modem-power-cycle 

• Cisco 3G cellular - Firmware - NOT included with IOS on HWIC module download seperate extract .tar to flash

  •   microcode reload cellular pa-bay slot gsm modem-provision  

• 3G Cisco router config
  • Details:
    • 2 - WWW GW IP's with gre tunnels
    • Example: Use subnet 10.202.191.x and 10.202.192.x for tunnel termination. .1 IS HQ GW

    !
    chat-script gsm "" "ATD*99*1#" TIMEOUT 60 CONNECT
    !
    !
    interface Cellular0/3/0
     ip address negotiated
     no ip virtual-reassembly in
     encapsulation ppp
     dialer in-band
     dialer idle-timeout 0
     dialer string gsm
     dialer-group 98
     async mode interactive
     ppp authentication chap callin
     ppp chap hostname dummy
     ppp chap password 0 dummy 
     ppp ipcp dns request
     ppp ipcp address accept
     ppp timeout 600
    !
    ! ##Dual Antenna HWIC##
    interface Cellular0/3/1
     no ip address
     encapsulation ppp
    !
    !
    interface Tunnel191
     description 3G-GRE
     bandwidth 100
     ip address 10.202.191.143 255.255.255.0
     ip nhrp group 191
     ip nhrp map multicast 10.202.191.1
     ip nhrp network-id 191
     ip nhrp nhs 10.202.191.1
     ip nhrp registration no-unique
     ip ospf network broadcast
     ip ospf flood-reduction
     ip ospf priority 0
     tunnel path-mtu-discovery
     tunnel path-mtu-discovery age-timer 30
     tunnel path-mtu-discovery min-mtu 1300
     tunnel source Cellular0/3/0
     tunnel destination {{IP-EXT-NAT-WWW1}}
    !
    interface Tunnel192
     description 3G-GRE-IS
     bandwidth 100
     ip address 10.202.192.143 255.255.255.0
     ip nhrp group 192
     ip nhrp map multicast 10.202.192.1
     ip nhrp network-id 192
     ip nhrp nhs 10.202.192.1
     ip nhrp registration no-unique
     ip ospf network broadcast
     ip ospf flood-reduction
     ip ospf priority 0
     tunnel path-mtu-discovery
     tunnel path-mtu-discovery age-timer 30
     tunnel path-mtu-discovery min-mtu 1300
     tunnel source Cellular0/3/0
     tunnel destination {{IP-EXT-NAT-WWW2}}
    !
    ip route {{IP-EXT-NAT-WWW1}} 255.255.255.255 Cellular0/3/0
    ip route {{IP-EXT-NAT-WWW2}} 255.255.255.255 Cellular0/3/0
    !
    dialer-list 98 protocol ip permit
    !
    line 0/3/0
     script dialer gsm
     no exec
     rxspeed 7200000
     txspeed 2000000
    !
    router ospf 1
     network 10.202.191.0 0.0.0.255 area 0
     network 10.202.192.0 0.0.0.255 area 0
    !

• Core routers, can be one or two routers, external IP's nated to 10.10.240.191 & 192

  • !
    interface Loopback191
     description TunnelSRC-nat-{{IP-EXT-NAT-WWW1}}
     ip address 10.10.240.191 255.255.255.255
    !
    interface Loopback192
     description TunnelSRC-nat-{{IP-EXT-NAT-WWW2}}
     ip address 10.10.240.192 255.255.255.255
    !
    interface Tunnel191
     description 3G-ExtIP-{{IP-EXT-NAT-WWW1}}
     ip address 10.202.191.1 255.255.255.0
     no ip redirects
     ip nhrp group 191
     ip nhrp map multicast dynamic
     ip nhrp network-id 191
     ip ospf network broadcast
     ip ospf flood-reduction
     ip ospf priority 191
     tunnel source Loopback191
     tunnel mode gre multipoint
    !
    interface Tunnel192
     description 3G-ExtIP-{{IP-EXT-NAT-WWW2}}
     ip address 10.202.192.1 255.255.255.0
     no ip redirects
     ip nhrp group 192
     ip nhrp map multicast dynamic
     ip nhrp network-id 192
     ip ospf network broadcast
     ip ospf flood-reduction
     ip ospf priority 192
     tunnel source Loopback192
     tunnel mode gre multipoint
    !
    router ospf 1
     network 10.202.0.0 0.0.255.255 area 0
    !

• 2013 - put cellular network interface in own vrf.

  • !
    vrf definition vrf3gAPN
      rd 10.202.194.1:134
      !
      address-family ipv4
      exit-address-family
    !
    interface Tunnel194
      tunnel vrf vrf3gAPN
    !
    interface Cellular0/3/0
      vrf forwarding vrf3gAPN
    !
    no ip route           10.10.240.194 255.255.255.255 Cellular0/3/0 permanent name 3G-Central-APN-LB
    ip route vrf vrf3gAPN 10.10.240.194 255.255.255.255 Cellular0/3/0 permanent name 3G-Central-APN-LB
    !

• IP SLA ping to force traffic on static route to bring-up Cellular to get IP to bring up Tunnel.

ip sla 191
!! Older routers #rtr  or #ip sla monitor !! 
  icmp-echo 10.10.240.191
  tag 3G-tun191
  frequency 600
ip sla schedule 193 life forever start-time now

Comments

• Feel free to leave comments or corrections.
• 2013-01-21 Pieter Smit - chicken egg problem where tunnel down because no source IP on cellular, and cellular down due to no interesting traffic.
  • Two solutions possible, [1.] Fix ip on cellular (works for private apn with fixed ip's) or [2.] ip sla to ping static route to force cellular0/3/0 up.
• 2012-10-20 Pieter Smit - Create page.

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