ISP Connection disconnects after 30 minutes after ISP change

Answered Question
Feb 7th, 2012

Hi Experts ,

We have an ASA (Earlier we had a PIX ) . It was required to test a new ISP link .The new ISP link was connected to the same interface on the ASA after removing the existing connection . The new public IP was also configured on the new interface by removing the old IP .  The connectivity to ISP gets lost after around 30 minutes after the new ISP configurations.  The connectivity to the Public ISP Gateway also gets lost .

But when we tried physically removing the new  ISP connection and the new removed the new IP details from the interface and reconfigured the interface with the same IP details ,the connection gets restored . But this too doesn 't last long . Only for about 30 minutes . After around 30 minutes the connection gets lost .

The only suspicious thing that was noted that the interface input errors were high. Please see sh interface stats below for more details

sh int e0/0

Interface Ethernet0/0 "outside", is up, line protocol is up

  Hardware is i82546GB rev03, BW 1000 Mbps, DLY 10 usec

        Auto-Duplex(Full-duplex), Auto-Speed(100 Mbps)

        MAC address 8843.e10c.552c, MTU 1500

        IP address XX.XX.XX.XX, subnet mask XX.XX.XX.XX

        306951524 packets input, 321152739248 bytes, 0 no buffer

        Received 55151 broadcasts, 0 runts, 0 giants

        13523741 input errors, 13523741 CRC, 0 frame, 0 overrun, 0 ignored, 0 ab

ort

        0 L2 decode drops

        252200763 packets output, 65089678278 bytes, 0 underruns

        0 output errors, 0 collisions, 5 interface resets

        0 babbles, 0 late collisions, 0 deferred

        0 lost carrier, 0 no carrier

        input queue (curr/max packets): hardware (0/10) software (0/0)

        output queue (curr/max packets): hardware (0/8) software (0/0)

  Traffic Statistics for "outside":

        306835093 packets input, 315426414716 bytes

        252200862 packets output, 59861074687 bytes

        4488945 packets dropped

      1 minute input rate 18 pkts/sec,  4321 bytes/sec

      1 minute output rate 20 pkts/sec,  1921 bytes/sec

      1 minute drop rate, 1 pkts/sec

      5 minute input rate 3 pkts/sec,  864 bytes/sec

      5 minute output rate 13 pkts/sec,  1420 bytes/sec

      5 minute drop rate, 0 pkts/sec

What can be the possible issue ? We have tried switching ISP a few times now and every time we are experiencing this same issue . Please help .

Many Thanks,

Anup

I have this problem too.
0 votes
Correct Answer by mvsheik123 about 2 years 2 months ago

Hi Anup,

The CRC errors points to cable that is connecting to the interface may be faulty. But in your case they accumulated as you kept changing the connections to different ISP. Connect to ISP and clear the counters. Check if the error increase. Also, when you switch the ISP & IPs, you need to reload the device to clear arp (or 'clear arp table with proper command). The disconnect after 30mins looks like relates to this.

hth

MS

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Correct Answer
mvsheik123 Tue, 02/07/2012 - 08:52

Hi Anup,

The CRC errors points to cable that is connecting to the interface may be faulty. But in your case they accumulated as you kept changing the connections to different ISP. Connect to ISP and clear the counters. Check if the error increase. Also, when you switch the ISP & IPs, you need to reload the device to clear arp (or 'clear arp table with proper command). The disconnect after 30mins looks like relates to this.

hth

MS

anupsasikumar Tue, 02/07/2012 - 09:15

Hi MS ,

That was indeed helpful ! Thanks ! I will try after switching ISP , clear the counters and will monitor the interface stats .

Many Thanks ,

Anup

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Posted February 7, 2012 at 8:28 AM
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