Losing GPRS connection on HWIC-3G-GSM

Question

Hi,
I have configured Cisco 2801 with HWIC-3G-GSM to work as a GPRS router.
The configuration is:
chat-script gsm "" "atdt*99***1#" TIMEOUT 60 "CONNECT"
chat-script pin "" "at+cpin=xxxx"
interface Cellular0/1/0
  ip address negotiated
  ip virtual-reassembly
  encapsulation ppp
  dialer in-band
  dialer pool-member 1
  dialer-group 1
  async mode interactive
  ppp chap hostname ""
  ppp chap password 0 ""
interface Dialer1
  ip address negotiated
  encapsulation ppp
  dialer pool 1
  dialer idle-timeout 0
  dialer string gsm
  dialer persistent delay initial 20
  dialer-group 1
access-list 1 permit any
dialer-list 1 protocol ip list 1
line 0/1/0
  script startup pin
  script dialer gsm
  no exec
  rxspeed 236800
  txspeed 118000
Normally it works fine, but when the signal level is very low it stops to respond. So this is normal, but when the signal is back again, the connection is still lost, or more specific, in my eyes the router (dialer?) doesn't know that the connection is lost.
The test scenario looks like this:
- ping 172.16.1.1 repeat 500
- ping response is received
- I'm disconnecting an antenna
- pings stops working
- connecting back the antenna
- pings are still not working, and all I can do is just to reboot router
I think that it might be a problem with interoperability with a specific GSM carrier.
I have checked what is going on with modem during this test and it looks like this:
- before test
Data Connection Information
===========================
Data Transmitted = 145108 bytes, Received = 139940 bytes
Profile 1, Packet Session Status = ACTIVE
        IP address = 172.25.188.5
Network Information
===================
Current Service Status = Normal, Service Error = None
Current Service = Combined
Packet Service = EDGE (Attached)
Packet Session Status = Active
Current Roaming Status = Home
Network Selection Mode = Automatic
Country = POL, Network = PLUS
Mobile Country Code (MCC) = 260
Mobile Network Code (MNC) = 1
Location Area Code (LAC) = 31942
Routing Area Code (RAC) = 4
Cell ID = 33761
Primary Scrambling Code = 0
PLMN Selection = Automatic
Registered PLMN = Plus GSM , Abbreviated = PLUS
Service Provider =
Radio Information
=================
Current Band = GSM 900, Channel Number = 1
Current RSSI = -56 dBm
Band Selected = GSM all band
Modem Security Information
==========================
Card Holder Verification (CHV1) = Enabled
SIM Status = OK
SIM User Operation Required = None
Number of Retries remaining = 3
- after the antenna has been disconnected
Data Connection Information
===========================
Data Transmitted = 359592 bytes, Received = 346840 bytes
Profile 1, Packet Session Status = ACTIVE
        IP address = 172.25.188.5
Network Information
===================
Current Service Status = Emergency Only, Service Error = None
Current Service = Combined
Packet Service = None
Packet Session Status = Active
Current Roaming Status = Roaming
Network Selection Mode = Automatic
Country = POL, Network = Orange
Mobile Country Code (MCC) = 260
Mobile Network Code (MNC) = 3
Location Area Code (LAC) = 40100
Routing Area Code (RAC) = 110
Cell ID = 40085
Primary Scrambling Code = 0
PLMN Selection = Automatic
Radio Information
=================
Current Band = GSM 900, Channel Number = 99
Current RSSI = -95 dBm
Band Selected = GSM all band
Modem Security Information
==========================
Card Holder Verification (CHV1) = Enabled
SIM Status = OK
SIM User Operation Required = None
Number of Retries remaining = 3
- when I plug back the antena
Data Connection Information
===========================
Data Transmitted = 359592 bytes, Received = 346840 bytes
Profile 1, Packet Session Status = ACTIVE
        IP address = 172.25.188.5
Network Information
===================
Current Service Status = Normal, Service Error = None
Current Service = Combined
Packet Service = EDGE (Attached)
Packet Session Status = Active
Current Roaming Status = Home
Network Selection Mode = Automatic
Country = POL, Network = PLUS
Mobile Country Code (MCC) = 260
Mobile Network Code (MNC) = 1
Location Area Code (LAC) = 31942
Routing Area Code (RAC) = 4
Cell ID = 33761
Primary Scrambling Code = 0
PLMN Selection = Automatic
Registered PLMN = Plus GSM , Abbreviated = PLUS
Service Provider =
Radio Information
=================
Current Band = GSM 900, Channel Number = 1
Current RSSI = -58 dBm
Band Selected = GSM all band
Modem Security Information
==========================
Card Holder Verification (CHV1) = Enabled
SIM Status = OK
SIM User Operation Required = None
Number of Retries remaining = 3
I don't really know where is the problem, maybe someone had a similar problem?

Answer 1

Hi,
I want to sent some more info;
I have 2 g.shdls conneciton and one 3g ..dialer0 and dilaer1 works for g.shdsl and dialer 3 for 3G conneciton.
IZMIR_BURO# sh dialer          
Ce0/2/0 - dialer type = IN-BAND ASYNC NO-PARITY
Dialer pool 5, priority 0
Idle timer (never), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is physical layer up
Dial reason: Persistent Dialer Profile
Interface bound to profile Di3
Time until disconnect never
Current call connected 00:00:04
Connected to internet
Di0 - dialer type = DIALER PROFILE
Idle timer (120 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is data link layer up
Number of active calls = 0
Dial String      Successes   Failures    Last DNIS   Last status
Di1 - dialer type = DIALER PROFILE
Idle timer (120 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is data link layer up
Number of active calls = 0
Dial String      Successes   Failures    Last DNIS   Last status
Di3 - dialer type = DIALER PROFILE
Idle timer (never), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is physical layer up
Number of active calls = 1
Dial String      Successes   Failures    Last DNIS   Last status
internet             18479          2    00:00:04       successful   Default
IZMIR_BURO#
IZMIR_BURO#sh int dialer 3
Dialer3 is up, line protocol is up (spoofing)
  Hardware is Unknown
  Internet address will be negotiated using IPCP
  MTU 1500 bytes, BW 56 Kbit/sec, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, loopback not set
  Keepalive set (10 sec)
  DTR is pulsed for 1 seconds on reset
  Interface is bound to Ce0/2/0
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 2w0d
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 6339
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/6339 (size/max total/threshold/drops)
     Conversations  0/1/16 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 42 kilobits/sec
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     169997 packets input, 201362608 bytes
     94633 packets output, 17498566 bytes
Bound to:
Cellular0/2/0 is up, line protocol is down
  Hardware is HSPA/UMTS/EDGE/GPRS-850/900/1800/1900/2100MHz
  MTU 1500 bytes, BW 2000 Kbit/sec, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, LCP TERMsent, loopback not set
  Keepalive not supported
  Interface is bound to Di3 (Encapsulation PPP)
  Last input 00:00:03, output 00:00:01, output hang never
  Last clearing of "show interface" counters never
  Input queue: 1/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/2/16 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1500 kilobits/sec
  1 minute input rate 0 bits/sec, 0 packets/sec
  1 minute output rate 0 bits/sec, 0 packets/sec
     336436 packets input, 205597072 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
     298008 packets output, 20549654 bytes, 0 underruns
     0 output errors, 0 collisions, 18486 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
IZMIR_BURO#sh caller time
  Line           User               Limit     Remaining Timer Type
  vty 514        dpcmerkez          00:03:00  00:02:59  Idle Exec
  Vi1            \
  Vi2            \
IZMIR_BURO#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route
Gateway of last resort is 0.0.0.0 to network 0.0.0.0
     83.0.0.0/32 is subnetted, 3 subnets
S       83.66.63.5 is directly connected, Dialer0
                   is directly connected, Dialer1
C       83.66.163.121 is directly connected, Dialer1
C       83.66.163.109 is directly connected, Dialer0
     172.25.0.0/24 is subnetted, 1 subnets
C       172.25.130.0 is directly connected, FastEthernet0/0
     10.0.0.0/32 is subnetted, 1 subnets
C       10.150.10.3 is directly connected, Dialer0
                    is directly connected, Dialer1
S*   0.0.0.0/0 is directly connected, Dialer0
               is directly connected, Dialer1
IZMIR_BURO#sh cell
IZMIR_BURO#sh cellular 0/2/0 all
Hardware Information
====================
Modem Firmware Version = K1_0_2_18AP C:/WS/F
Modem Firmware built = 12/29/08
Hardware Version = 1.0
International Mobile Subscriber Identity (IMSI) = 286027450382740
International Mobile Equipment Identity (IMEI) = 011955000180192
Factory Serial Number (FSN) = D66294005801004
Modem Status = Online
Current Modem Temperature = 26 deg C, State = Normal
Profile Information
====================
Profile 1 = INACTIVE*
PDP Type = IPv4
Access Point Name (APN) = internet
Authentication = None
Username: , Password:
* - Default profile
Data Connection Information
===========================
Data Transmitted = 17403856 bytes, Received = 201192534 bytes
Profile 1, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Profile 2, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Profile 3, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Profile 4, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Profile 5, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Profile 6, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Profile 7, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Profile 8, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Profile 9, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Profile 10, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Profile 11, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Profile 12, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Profile 13, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Profile 14, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Profile 15, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Profile 16, Packet Session Status = INACTIVE
        Inactivity Reason = Normal inactivate state
Network Information
===================
Current Service Status = Emergency Only, Service Error = Illegal ME
Current Service = Invalid
Packet Service = None
Packet Session Status = Inactive
Current Roaming Status = Home
Network Selection Mode = Automatic
Country = TUR, Network = VODAFONE
Mobile Country Code (MCC) = 286
Mobile Network Code (MNC) = 2
Location Area Code (LAC) = 10151
Routing Area Code (RAC) = 11
Cell ID = 21806
Primary Scrambling Code = 124
PLMN Selection = Automatic
Radio Information
=================
Current Band = WCDMA 2100, Channel Number = 10663
Current RSSI = -77 dBm
Band Selected = Auto
Number of nearby cells = 1
Cell 1
        Primary Scrambling Code = 0x7C
        RSCP = -82 dBm, ECIO = -7 dBm
Modem Security Information
==========================
Card Holder Verification (CHV1) = Disabled
SIM Status = OK
SIM User Operation Required = None
Number of Retries remaining = 3
IZMIR_BURO#