Show connections on a 1721

Answered Question
Dec 14th, 2007
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I currently have a site connected via a T1 and it is getting flooded. Is there a command that I can run on the 1721 Router that will show all connections so that I can identify the source / destination IP addresses of all traffic? I tried "show connections" but that didn't have the info that I needed.

Thanks in advance!

Correct Answer by Edison Ortiz about 9 years 7 months ago
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Overall Rating: 5 (1 ratings)
TrueFX Fri, 12/14/2007 - 08:23
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Attached is the 'show version'

Cisco Internetwork Operating System Software

IOS (tm) C1700 Software (C1700-K9O3SY7-M), Version 12.2(8)T1, RELEASE SOFTWARE (fc2)

TAC Support:

Copyright (c) 1986-2002 by cisco Systems, Inc.

Compiled Sat 30-Mar-02 14:18 by ccai

Image text-base: 0x80008108, data-base: 0x80D2C08C

ROM: System Bootstrap, Version 12.2(7r)XM1, RELEASE SOFTWARE (fc1)

pob-1721 uptime is 23 minutes

System returned to ROM by reload at 09:56:54 CST Fri Dec 14 2007

System restarted at 09:58:24 CST Fri Dec 14 2007

System image file is "flash:c1700-k9o3sy7-mz.122-8.T1.bin"

cisco 1721 (MPC860P) processor (revision 0x100) with 44237K/4915K bytes of memory.

Processor board ID FOC06150DEF (1625455792), with hardware revision 0000

MPC860P processor: part number 5, mask 2

Bridging software.

X.25 software, Version 3.0.0.

1 FastEthernet/IEEE 802.3 interface(s)

1 Serial network interface(s)

1 Virtual Private Network (VPN) Module(s)


32K bytes of non-volatile configuration memory.

16384K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102

TrueFX Fri, 12/14/2007 - 08:51
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I type the following :

config t

int se 0

ip flow ingress

--- Unknown command

I don't think my router supports netflow.

TrueFX Fri, 12/14/2007 - 09:27
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Thank you so much! I was able to use the Netflow data to track down the culprit!

I can tell that I will be using this a lot in the future!

TrueFX Fri, 12/14/2007 - 08:30
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As far as IP Accounting, we don't have any ACLs on the system, and it looks like IP Accounting only tracks failures agains the ACLs. Is that correct?


Edison Ortiz Fri, 12/14/2007 - 08:36
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No, you can implement ip accounting without any ACLs.


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