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Dan Neely5-Mar-10 4:57
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QuestionPC that seems to be dead but... it has been due to a software with a virus or similar... Pin
Joan M3-Mar-10 7:29
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AnswerRe: PC that seems to be dead but... it has been due to a software with a virus or similar... Pin
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QuestionHow to discover a directly connected device Pin
deviao25-Feb-10 6:42
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Michel Godfroid1-Apr-10 7:00
Michel Godfroid1-Apr-10 7:00 
GeneralRe: How to discover a directly connected device Pin
deviao1-Apr-10 10:12
deviao1-Apr-10 10:12 
Hi There Michel,

Thanks for your response, i was hoping i could gather some interest just for a discussion. Smile | :)

I have virtually solved the problem and have a nice working piece of software. Basically i turned to neighbor discovery protocols. In this Case The Cisco Discovery Protocol (CDP). There is a CDP MIB that provides me with a lot of information about what devices are connected to each interface and therefore, I am able to hop between devices because i know connected IP's.

Basically, my prgram jumps to the device the user specifies as the start IP, entering in the SNMP information and the network address they wish to map. My program then goes to that device, gathers all system information about the device, then gathers information about each local interface. Then my program looks into CDP MIB and looks at the CDP Cache (where neighbor details are stored), creates an entry in the database for each connected IP address, then assigns the connected interface entry to the local interface entry. My program then hops to the next device and does the same, so on and so forth. I have parameters in my code to make sure all IPs visited are noted, and a list of IPs to visit to prevent the oprogram from needlessly visiting the same device twice. This way i can track the hop count and limit it if required. At the end of the data collection, my program then analyses the data and draws a network map and listens for traps Smile | :) its a bit like a very basic network management system (extremley basic) but it works sweetly Smile | :)

Obviously this is not a perfect solution because CDP only operates on cisco devices and in some cases, CDP is disabled. There does exist a little protocol called the Link Layer Discovery Protocol (LLDP, refered to as 802.1ab i think). This is a vendor neutral neighbor discovery protocol and operates very much like CDP, but on any vendors device (Cisco, HP etc) providing the device supports it (my Catalyst 2950s do not, but the 2960's do). However, due to my limited budget the equipment i have does not support LLDP *sigh*

Since doing this for my uni project i have become particulary interested in network mapping and management. It really is quite a variedand detailed topic Smile | :)

Comments and thoughts are welcomed Smile | :)
QuestionController RAID Intel and windows xp, problem with installation Pin
dift24-Feb-10 20:38
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fat_boy29-Apr-10 23:24
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QuestionCisco Call Manager demo license Pin
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QuestionWebcam requirements for Facial Recognition? Pin
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QuestionBarcode Reader: How to disable the key board? Pin
Xiangyang Liu 刘向阳21-Feb-10 16:46
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Xiangyang Liu 刘向阳22-Feb-10 5:07
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QuestionThread on Multi-core Systems Pin
Ofer Gross21-Feb-10 5:37
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