Network Problem Analyzer

Jun 20, 2009 @ 06:41 pm by HackingManual

Get a complete analysis of your network traffic and anything that could be causing problems using ICSI Netalyzr. This online scanner is hosted by Berkeley.edu

Although however ironic an Online network problem analyzer is, it really does do a nice job.

In my report I found out that comcast residential service blacklists me from sending email. So if I had an email server at home my email’s would go out as spam.

network troubleshooting analysis 500x321 Network Problem Analyzer

IGRP

Jul 05, 2008 @ 05:17 pm by HackingManual

IGRP stands for Interior Gateway Routing Protocol.

IGRP is a distance vector protocol, meaning that it decides that the best path is the closest path. IGRP sends regular updates to it’s neighbors but it doesn’t talk as much as RIP. IGRP updates every 90 seconds. Because RIP couldn’t handle long distance relationships IGRP was created as a replacement. IGRP’s Default hop count is 100 but it can be set up to 255 hops by the network administrator. Which is way further than RIP’s 16 hop maximum.

RIP also lacked more than one routing metric. IGRP uses Bandwidth, Delay, reliability, and load as it’s routing metrics.

IGRP is a Cisco proprietary protocol. Meaning it only talks to routers made by Cisco. Kinda like the preppy girls from high school who wouldn’t be caught dead talking to someone who wasn’t popular.

IGRP uses hold down timers prevent gossip. When a route is marked invalid hold down timers prevent router gossip from reinstating that route. So lets pretend we have a router named Map , so if Map doesn’t receive an update from a particular route with in a certain period of time, it calculates the next best way to get to the destination, then it sends that information to all of the other routers. Then those routers update everyone else. The failed route change gets spread by word of mouth so to speak. But what if a router that hadn’t gotten an update and spreads false information to a router that had gotten the update. When a route is marked invalid, hold down timers prevent router gossip from reinstating that router. IGRP also uses split horizons and poison reverse to prevent routing loops.

Uses AS Number for activation
Invalid Timer: 270 seconds or 3 times how often it updates.
Hold down Timer: 280 seconds or 10 seconds more than the invalid timer.
Flush timer: 670 seconds or 7 times how often it updates.

EIGRP

Jul 05, 2008 @ 05:16 pm by HackingManual

EIGRP stands for Enhanced Interior Gateway Routing Protocol. It is a classless hybrid routing protocol created as an enhanced version of IGRP.

Just like it’s predecessor EIGRP is a Cisco proprietary routing protocol that uses an AS number. It synchronizes routing tables between neighbors at startup, and then it sends specific updates only when topology changes occur.

EIGRP performs path selection by using DUAL(Diffusing Update Algorithm)

EIGRP Supports several protocols including IP, IPX, and Apple Talk. It stored it’s data in the ram for fast retrieval. The three databases it uses are:

The Neighbor table
The Topology table
The Routing table

EIGRP Uses RTP and Supports multiple AS numbers It’s administrative distance is Internal:90 and External:270

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