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New Member

Cisco IPS 4240 stops file downloads at 90%

Hi everybody. I have a Cisco IPS 4240 with version 7.0.4 installed and upgraded to the last signature. But since it was installed i have the issue with some file downloads because the IPS stops the file at 90-99% of download percentage (in some cases, not all), The ips is inline in front of firewall, some partner say me that i have to change the mode to promiscuous for the solution of the issue, but i think that if the IPS was designed for work inline, i dont have to change anything and maybe some expert of the forum have the correct answer.  Or this issue have solution with configuration changes.

Sorry by my write english.... I try to find some signature that causes the issue but if i disabled the sensor, the issue occurs. The firewall is not the problem because if i connect a laptop in front of the firewall and behind of IPS the issue occurs too. Well i have now some months trying of find a solution. In the page of Cisco not find some similar.... [:-(

Pd. An example of files that stop when downloads is Apple Itunes... or Microsoft Patch, or Vmware software by example.

Thanks for your response are greatly appreciated.

3 REPLIES
Bronze

Re: Cisco IPS 4240 stops file downloads at 90%

so you're saying if you put your sensor in bypass mode enabled, the problem remains? we first need to rule out if the issue is present when the sensor is in bypass mode (basically acting like a connected wire).

is this issue happening only with large files? what if you're downloading a small file does it also stop?

we need to find out what you mean the transfer stops in packet sense. is there a tcp reset sent? or traffic simply is dropped and the tcp connection timesout?

a good idea is to capture the traffic on the sensor on both ingress/egress interfaces. for more about packet capturing on the sensor:

http://www.cisco.com/en/US/docs/security/ips/7.0/command/reference/crCmds.html#wp481344

Regards

Fadi.

New Member

Re: Cisco IPS 4240 stops file downloads at 90%

Thnaks for your help this is the last packets before freeze the download:

The size of the download with problems is random, sometimes ocurrs with small size downloads sometimes ocurrs with large downloads. The download of the example have 47 MB, I think that the traffic is dropped and the tcp conn timeout. Do you see some anomalies in this traffic portion?.

14:55:20.536119 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
14:55:20.536122 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
14:55:20.536420 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
14:55:20.536718 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
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14:55:20.537123 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
14:55:20.537125 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
14:55:20.537517 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
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14:55:20.537821 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
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14:55:20.638562 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
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14:55:20.638864 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
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14:55:20.639164 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
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14:55:20.639560 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
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14:55:20.640260 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
14:55:20.640263 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
14:55:20.640568 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
14:55:20.641958 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
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14:55:20.845647 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 47929166 win 65335
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14:55:20.849040 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 48010926 win 65335
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14:55:20.952982 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 48021146 win 65335
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14:55:21.162162 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 48066406 win 63875
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14:55:21.572333 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 48116046 win 65335
14:55:21.585313 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 48151086 win 65335
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14:55:21.585417 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 48151086 win 65335
14:55:21.585512 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 48151086 win 65335
14:55:21.677172 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 48151086 win 65335
14:55:21.688654 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 48151086 win 65335
14:55:21.688657 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 48158386 win 65335
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14:55:21.780613 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 48170066 win 65335
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14:55:21.986998 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 48170066 win 65335
14:55:22.090639 IP 10.0.0.1.56109 > apollo.fileburst.net.80: . ack 48170066 win 65335

New Member

Re: Cisco IPS 4240 stops file downloads at 90%

An this is the capture of the portion of final packets on the other interface downloading the same file in other time.

15:12:00.320770 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48096342 win 65335
15:12:00.330712 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48096342 win 65335
15:12:00.330787 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48096342 win 65335
15:12:00.422834 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48096342 win 65335
15:12:00.424274 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48096342 win 65335
15:12:00.434340 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48096342 win 65335
15:12:00.526516 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48096342 win 65335
15:12:00.527848 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48096342 win 65335
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15:12:00.631895 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48160582 win 65335
15:12:00.641321 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48160582 win 65335
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15:12:00.744829 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48160582 win 65335
15:12:00.746126 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48160582 win 65335
15:12:00.848189 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48160582 win 65335
15:12:00.849646 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48160582 win 65335
15:12:01.673735 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48160582 win 65335
15:12:01.675281 IP 10.0.0.1.50351 > apollo.fileburst.net.80: . ack 48169342 win 65335

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