Cisco 881G 3G interface config.

[jopetik09]

Hi All,

I have a router Cisco 881G, DSL was running.
Yesterday we got 3G, now I need to config to get work 3G and also failover between DSL and 3G.
I hope someone will provide me step by step to achive above would be appreciate.

Below are some outputs for more inforamiton:

#sh cellular 0 secu
Card Holder Verification (CHV1) = Enabled
SIM Status = Locked
SIM User Operation Required = Enter CHV1
Number of Retries remaining = 3

#sh cellular 0 profil
Profile 1 = INACTIVE*
--------
PDP Type = IPv4
Access Point Name (APN) = web.vodafone.de
Authentication = CHAP
Username: internet, Password: tm

* - Default profile

#sh int cell
CuxhavenRTR#sh int cellular 0
Cellular0 is down, line protocol is down
  Hardware is 3G Modem-HSPA/UMTS/EDGE/GPRS-850/900/1800/1900/2100MHz / Global
  MTU 1500 bytes, BW 384 Kbit/sec, DLY 100000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, LCP Closed, loopback not set
  Keepalive not supported
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 1w5d
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/0/16 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 288 kilobits/sec
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 6 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up

#sh cellular 0 net
Current Service Status = Emergency Only, Service Error = None
Current Service = Invalid
Packet Service = None
Packet Session Status = Inactive
Current Roaming Status = Home
Network Selection Mode = Automatic
Country = DEU, Network = TMO D
Mobile Country Code (MCC) = 262
Mobile Network Code (MNC) = 1
Location Area Code (LAC) = 16683
Routing Area Code (RAC) = 1
Cell ID = 4370
Primary Scrambling Code = 347
PLMN Selection = Automatic
Available PLMNs:
PLMN Name = T-Mobile D (TMO D)
        MCC = 262, MNC = 1
        Status = , Network = Unknown

PLMN Name = o2 - de (o2 - de)
        MCC = 262, MNC = 7
        Status = Supports GPRS, Network = GSM

PLMN Name = Vodafone.de (Voda de)
        MCC = 262, MNC = 2
        Status = , Network = GSM

PLMN Name = T-Mobile D (TMO D)
        MCC = 262, MNC = 1
        Status = , Network = GSM

PLMN Name = Vodafone.de (Voda de)
        MCC = 262, MNC = 2
        Status = , Network = Unknown

PLMN Name = E-Plus (E-Plus)
        MCC = 262, MNC = 3
        Status = , Network = Unknown

PLMN Name = o2 - de (o2 - de)
        MCC = 262, MNC = 7
        Status = , Network = Unknown

PLMN Name = E-Plus (E-Plus)
        MCC = 262, MNC = 3
        Status = , Network = GSM

Thanks in advance.
Jopeti.

[jopetik09]

Hi Frank,

Please see the attached debug.txt file for complete debug output and suggest me if anything worng.

Or shall I go ahead with confirmation that 3G connection is working fine and it can act as failover if DSL fails.

I found that sometimes that ping to 4.2.2.2 is successfull and sometimes the success rate is 0 like that.

Jopeti.

[Frank Woodyard]

Jopeti,

You are failing because the "chat-script" command is missing from your configuration.

chat-script gsm "" "ATDT*99#" TIMEOUT 60 "CONNECT"

Extracted from your diagnostic capture, the connection is failing;

*Mar 18 08:35:51.703: CHAT3: no matching chat script found for gsm
*Mar 18 08:35:51.703: CHAT3: Dialing using Modem script: d0efault-d0ials0cript & System script: none

:

:

*Mar 18 08:35:51.755: CHAT3: Chat script d0efault-d0ials0cript finished, status = Connection aborted
*Mar 18 08:35:51.755: TTY3: Line reset by "Async dialer"
*Mar 18 08:35:51.755: Ce0 DDR: disconnecting call

Try adding the command above to your configuration.

Best of luck,

Frank

[jopetik09]

Hi Frank,

I have changed the chat script which you have given.

Please find the attached debug output and confirm me is that working fine.

Thanks in advance.

Jopeti.

[Frank Woodyard]

Jopeti,

Look at the bottom of your attached capture file, the interface acquires an IP meaning the cellular interface successfully connected to the carrier.  If you succeede in pinging your target address, you are connected.  You had successful pings to the target.  The only reason there were misses was in the time to connect.

*Mar 20 06:10:23.905: Ce0 IPCP:    PrimaryDNS 10.74.83.22 (0x81060A4A5316)

*Mar 20 06:10:23.905: Ce0 IPCP:    SecondaryDNS 193.254.160.1 (0x8306C1FEA001)

*Mar 20 06:10:23.905: Ce0 IPCP: State is Open

*Mar 20 06:10:23.905: Ce0 IPCP: Install negotiated IP interface address 10.160.157.197

*Mar 20 06:10:23.937: Ce0 DDR: dialer protocol up.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 88 percent (44/50), round-trip min/avg/max = 104/141/1480 ms

Cheers,

Frank Woodyard

[jopetik09]

Hi Frank,

Yes that is really good.

For test purpose I shutdown the DSL interface and I am able to connect Internet through Cellular0

But my current chalenge is that I need to achive NAT redundancy...

Below is the static NAT for easy VPN device pointing to DSL IP.
ip nat inside source static 10.10.10.2 206.180.116.x extendable

After shutdown the DSL interface I changed the above static NAT like below but not getting any translations.
ip nat inside source static 10.10.10.2 interface Cellular0

And for redundant purpose both NAT's or any alternative should be there because if DSL fails the NAT should be up on Cellular0

Could you please help me on this...

Jopeti.