Articles in the networking category

1. Default Username / Password for Cisco SAMI LCP

   Posted on August 04, 2010 in Networking

   For some reason, they don't make this completely obvious.

   login: admin
   password: admin
   

2. Show Cisco Interface Status and Traffic Rates Only

   Posted on July 24, 2010 in Networking

   I would hope there is a better way to do this. The other day, I had a need to see all the interfaces on a router and how much input and output traffic they were passing. This just seems like something that should be built in, but I've not seen …

3. Cisco Input and Output Queue Drops

   Posted on July 19, 2010 in Networking

   This seems to be a pretty common problem for Cisco users. Not that Cisco devices have more queue drop problems, just that more Cisco users are a little confused by the information generated in the show interface command.

   Specifically, we're talking about the lines that look something like this:

   Input …

4. Cisco 7200 with Corrupted IOS Image or Faulty ATA PCMCIA Flash

   Posted on July 08, 2010 in Networking

   If you find yourself in the situation where a Cisco 7200 series router has a corrupted IOS image or the flash drive has gone on the blink, the following documents may be useful to you. Not all of these documents are Cisco 7200 specific, but they are all useful.

   • Standard …

5. Cisco iperf Equivalent or Cisco-based Bandwidth Testing

   Posted on June 30, 2010 in Networking

   If you've worked on networks long enough, you're probably familiar with iperf. This application is great for testing throughput between two computers on your network. Unfortunately, if you find yourself in a situation where you have less than two computers to test with, iperf is less than ideal.

   Fortunately, Cisco …

6. Cisco BWG Feature Progression

   Posted on April 23, 2010 in Networking

   The Cisco Broadband Wireless Gateway (BWG) is an essential piece of the IEEE 802.16e (WiMAX) architecture. As the Access Service Network (ASN) Gateway, it provides aggregation services for the Radio Access Network (RAN). Cisco first released it's BWG software in late 2007. Since that time, a considerable number of …

7. Cisco IOS to BWG Version Matrix

   Posted on April 16, 2010 in Networking

   Figuring out which version of Cisco IOS includes which version of the Cisco Broadband Wireless Gateway (BWG) can be a real pain. Hopefully the following table will help:

   Cisco IOS	Cisco BWG	Supported Hardware
   12.4(15)XL	1.0	7301 Router, SAMI (6500, 7600)
   12.4(15)XL2	1 …

8. Setting Up SNMPv3 In Cisco IOS

   Posted on March 27, 2010 in Networking

   In the following example, I'm going to set up a Simple Network Management Protocol version 3 (SNMPv3) user on a Cisco router with limited view of the system MIB.

   • Create an SNMP view that limits the user to the system MIB.

     ROUTER(config)# snmp-server view SYSTEM system included
     

   • Create an …

9. Average IP Packet Size

   Posted on March 18, 2010 in Networking

   In this case, gentlemen, size matters.

   Yesterday, I calculated the average packet size for one of the networks I work on using data from 263986M (263,986,000,000+) packets.

   Average packet size for that sample was 557 bytes.

10. Routers and Switches

    Posted on September 21, 2009 in Networking

    Although routers and switches are often located near each other in a network environment, the two devices offer very different functionality. Routers are network devices that send data packets to distinct network segments. A router examines incoming packets and makes routing decisions based on the destination address in the packet …