Articles tagged with cisco

1. Cisco's New ip verify unicast source reachable-via

   Posted on January 16, 2008 in Networking

   Oops! I guess I'm way behind the times.

   For quite a while, I've been using ip verify unicast reverse-path to prevent packets with spoofed source addresses from crossing my routers. Apparently, as of IOS 12.0 (12.4 is current as of this writing), that command has been replaced with …

2. Find Cisco Serial Numbers with the IOS Command Line

   Posted on January 14, 2008 in Networking

   "How do I find a Cisco serial number remotely through the command line?"

   This is one of those frequently asked questions that I see over and over. So, here's the quick and dirty answer:

   You can find Cisco serial numbers from the IOS command line by using the show inventory …

3. T.37 Store and Forward Fax and Cisco AS5300: Dial Peers

   Posted on January 09, 2008 in voice

   Note: This is part of a discussion regarding the configuration of a Cisco AS5300 for T.37 Store and Forward Faxing.

   The final piece of the T.37 Store and Forward Fax configuration is the dial peers to handle the incoming fax and the outgoing email. I'll walk you through …

4. TCL Onramp Script for T.37 Store and Forward Fax

   Posted on January 08, 2008 in voice

   Note: This is part of a discussion regarding the configuration of a Cisco AS5300 for T.37 Store and Forward Faxing.

   Unfortunately, the Cisco AS5300 does not have the ability to handle incoming fax processing without the help of additional software. You can download the app_faxmail_onramp TCL script from the …

5. T.37 Store and Forward Fax and Cisco AS5300: MTA and General Setup

   Posted on January 07, 2008 in voice

   I was recently engaged to configure a fax-to-email solution using a Cisco AS5300 and Asterisk. My original idea was to compile spandsp into Asterisk and use the RxFax() application to receive faxes. Everything seemed to work OK on the Asterisk side, but I had a lot of trouble with incoming …

6. Installing PDLMs for Cisco NBAR

   Posted on December 17, 2007 in Networking

   I've talked about using Cisco <acronym title="Network-Based Application Recognition">NBAR</acronym> frequently (check the Related Posts section below for more articles). One thing I've never pointed out is that not all versions of Cisco <acronym title="Internetwork Operating System">IOS</acronym> come with all protocol descriptions built in.

   Not …

7. Cisco ASA / PIX Logging Facilities

   Posted on December 11, 2007 in Networking

   When setting up a Cisco ASA or PIX to send logs to a remote syslog server, you need to specify which facility to use. This can cause a bit of disconnect since the syslog server configuration uses names and the logging facility command in the Cisco Adaptive Security Appliance Software …

8. 2 AM and ssh_exchange_identification Silliness

   Posted on December 02, 2007 in Networking

   I could blame it on the late hour, but the truth of the matter is that I'm just a bonehead.

   I'm currently installing a new Cisco ASA 5520 to replace an old Cisco PIX. This new device is going to use <acronym title="Secure SHell">SSH</acronym> and TACACS+ to …

9. Cisco Making My Day Difficult

   Posted on November 26, 2007 in uncategorized

   Well, no matter how annoying these problems may be for me, there's surely some poor engineer at Cisco working his tail off to get the issue resolved.

   Good luck!

   UPDATE: More info from CNET regarding the outage.

10. Catalyst 2960 Unsupported Commands Still Work?

    Posted on October 26, 2007 in Networking

    This is a bit of random oddness I stumbled upon this morning.

    I was working on a Cisco Catalyst 2960 switch and needed to know which MAC addresses the device had learned on a particular interface. The usual way to do this is with the show mac-address-table interface command. While …