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Categories
Monthly Archives: April 2010
Troubleshoot NAT
Definitions NAT Types Static NAT — A one-to-one mapping of private to public IP addresses, best used for a device that needs access from outside the AS. Dynamic NAT — A dynamic one-to-one mapping between private and public IP addresses, … Continue reading
Posted in Routing
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Troubleshooting Spanning Tree Protocol
Spanning Tree Protocol Basics: In a layer 2 environment with no routing, active redundant paths are neither allowed no desirable, because the can cause loops. Because a switch only segments collision domains it does not segment broadcast domains. STP helps … Continue reading
Posted in Routing
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DocMgr with AD Authentication
Over the past couple of days I hacked an older version of DocMgr to authenticate users to Active Directory. I thought it might be interesting for some readers to see my thought process, hence this post. All of the scripts … Continue reading
Posted in Code, Linux
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Linux DBI::ODBC AS400
At the Circus we are removing the last vestige of our OpenLDAP implementation and moving it to Active Directory. As a result I’m going to document some of the odd scripts I have written as glue to help keep things … Continue reading
Posted in Code, Linux
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Troubleshoot Router Performance
There are three general causes of router performance issues: 1. High CPU load 2. Router packet switching mode 3. Excessive memory use Processes that can be a cause of high CPU load: • ARP Input process — Heavy traffic load … Continue reading
Posted in Routing
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Security by Obscurity
It kills me. One of our Windows administrators went to class and “learned” that you should not give meaningful names to servers on your network because that would make it too easy for some cracker find his or her way … Continue reading
Posted in Linux, Thoughts
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EIGRP Troubleshooting
2010-04-14 07:45:39 EIGRP Troubleshooting Enhanced Interior Gateway Protocol (EIGRP) EIGRP is a Cisco proprietary hybrid routing protocol or an advance distance vector routing protocol. There are four components that make up EIGRP: 1. Protocol-dependent modules — Supports several routed protocols. … Continue reading
Posted in Uncategorized
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Troubleshoot BGP
2010-04-13 16:07:12 Troubleshoot BGP BGP is a path-vector routing protocol. Routes are tracked in terms of the AS they pass through, and routers avoid loops by rejecting routes that have already passed through their AS. Definitions Synchronization — Before iBGP … Continue reading
Posted in Routing
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Wednesday Night Worlds
One of my friends got onto me that my blog was all about work. He wanted to read stories about some of my cycling adventures. Rather than launch into stories about riding across America, I’ll start with some stories from … Continue reading
Posted in Cycling, Thoughts
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Troubleshoot OSPF
My notes for EIGRP felt like I was just regurgitating the Key Points from the book. So with OSPF I read the book and looked at the command output, then decided to copy my notes from the BSCI and edit … Continue reading
Posted in Routing
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ChainRingCircus 