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Network devices can be rich sources of descriptive statistical data For the sake of example, here is some of the data available from a Cisco 2651XM router running IOS 122 These commands apply to a wide variety of devices running IOS, however First, to collect accounting statistics, use the ip accounting command on one or more interfaces This command counts packets that leave an interface, so consider the sort of traffic you want to watch In the following example our router has two Ethernet interfaces numbered fa0/0 and fa0/1 The first faces the Internet while the second faces the internal network To watch traffic coming from the Internet, we enable IP accounting on the fa0/1 interface (Enabling IP accounting on the fa0/0 interface would mean watching traffic leave the internal network bound for the Internet If this is a concern, enable IP accounting on this interface as well) Cisco documentation permits the addition of the optional phrase access violations to watch traffic that failed to pass an access list However, I have found this option interferes with the collection of normal IP accounting statistics, so here let's use plain-vanilla ip accounting without that addition
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gill>enable Password: gill#configure terminal Enter configuration commands, one per line gill(config)#int fa0/1 gill(config-if)#ip accounting gill(config-if)#exit gill(config)#exit
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Once IP accounting is operational, we issue the show ip accounting command to see counts of packets leaving interface fa0/1
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gill#show ip accounting Source Destination 684805 192168401 20412719825 192168502 6635250150 192168502 2051884112 192168502 21610416151 192168502 20717118216 192168502 6635250124 192168502 64122014 192168502 64158176217 192168502 663525055 192168502 641224248 192168502 20525248160 192168502 20415218475 192168502
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This is reminiscent of session data, but don't be fooled These are aggregates of the traffic seen between each party While the data can be used to identify "top talkers," it can also validate whether a certain IP address was ever seen by the router In some cases this can be enough information to know whether an intruder has interacted with a victim since the time the accounting statistics began To restart the counters, issue the clear ip accounting command in exec mode
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Purpose: Cisco-like interface statistics tool Author: Lee Walkin Internet site: http://wwwspelionetru/soft/ FreeBSD installation: Installed via /usr/ports/net-mgmt/ipcad Version demonstrated: 292 Ipcad is the "IP Cisco Accounting Daemon" It was written to provide many of the same statistics produced by Cisco gear, but with a generic UNIX server as the sensor platform Once started, Ipcad opens a Remote Shell ( rsh ) server on the loopback address By using the rsh command, analysts can query Ipcad for statistics First, configure the ipcadconf file to watch the appropriate interface For our simple use here we can replace the entire file with this single entry In the following command, replace ngeth0 with the name of the interface you want to watch
interface ngeth0; Next, start Ipcad with this syntax The d switch tells the program to become a daemon The r switch tells Ipcad to read saved accounting data at startup, and s tells it to save what it has when it exits
ipcad drs Once Ipcad is running, check on its status
bourque# rsh 127001 stat Interface ngeth0: received 358762, 5 m average 0 bytes/sec, 0 pkts/sec, dropped 0 Entries made: 263 Memory usage: 0% (9468 from 1048576) Free slots for clients: 9 IPCAD uptime is 2:33 bourquetaosecuritycom uptime is 3 days 12:29 Now you're ready to collect real statistics
bourque# rsh 127001 show ip accounting | less Source 2081855448 6884672 64158176216 6884672 Destination 6884672 2081855448 6884672 64158176216 Packets 440 436 702 540 Bytes 247524 153628 568600 255898
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Purpose: Interface statistics tool Author: Gael Roualland Internet site: http://gaelrouallandfreefr/ifstat/ FreeBSD installation: Installed via /usr/ports/net/ifstat Version demonstrated: 11 Ifstat is a simple tool that offers a quick look at the amount of traffic passing through an interface I use it to quickly check the amount of traffic seen by a sensor's monitoring interfaces The following command tells Ifstat to watch interfaces fxp0 and ngeth0 The b switch instructs Ifstat to report kilobits per second rather than the default kilobytes per second The S switch tells Ifstat to report its findings on one line rather than output a new line for every sample The t switch prints a timestamp at the far left
bourque# ifstat -i fxp0,ngeth0 -b S t Time fxp0 ngeth0 HH:MM:SS Kbps in Kbps out Kbps in Kbps out 18:20:52 082 161 225423 000 In this example we see that the ngeth0 interface, which watches a cable modem line, is fairly busy The fxp0 interface is not I must mention that Ifstat did not report statistics on some of the other interfaces used in this chapter, like sf1 and em0 I confirmed that these interfaces saw traffic, and other tools reported statistics without incident This is a good example of the need to double-check results with other tools to confirm that your applications perform as expected When built using the FreeBSD ports tree or installed from source code, Ifstat will interact with the net-snmp library to enable polling interfaces on SNMP-enabled routers In the following example, we query a border router to report its interface statistics Be sure to pass the proper community string to the router with the s switch The z switch tells Ifstat to not print statistics on interfaces that are up but unused, like the router's null interface
bourque# ifstat s communitystring@router b S t z Time FastEthernet0/0 FastEthernet0/1 HH:MM:SS Kbps in Kbps out Kbps in Kbps out 17:29:52 141183 3619 3748 141255 Ifstat is useful for a quick look at interface statistics For a little more information, we move to Bmon