Articles tagged with cisco

1. 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 …

2. 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 …

3. 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 …

4. 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 …

5. 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 …

6. 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.

7. 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 …

8. What is Local Policy-Based Routing?

   Posted on October 24, 2007 in Networking

   What is Local <acronym title="Policy-Based Routing">PBR</acronym>?

   Policy-based routing makes routing decisions based on factors other than normal routing protocols. For example, it might be necessary to forward all <acronym title="Session Initiation Protocol">SIP</acronym> packets via a more expensive low-latency link while all other traffic use …

9. SNMP Community String Indexing

   Posted on October 11, 2007 in Networking

   Today I was browsing through the Cisco NetPro Forums and came across someone that needed to track down which switch port a <acronym title="Media Access Control">MAC</acronym> address had been dynamically learned on.

   I'd seen this sort of thing before in the Bridge MIB, so I assumed it …

10. Allow PPTP Through Cisco ASA

    Posted on October 10, 2007 in Networking

    By default Point-to-Point Tunneling Protocol (PPTP) will now work properly through a Cisco Adaptive Security Appliance (ASA) firewall or it's forerunner the Cisco <acronym title="Private Internet EXchange">PIX</acronym>.

    Prior to PIX software version 6.3, allowing PPTP to work through a PIX was a painful procedure involving static …

11. Cisco NBAR P2P Protocols

    Posted on October 08, 2007 in Networking

    The following are the Peer-to-Peer (P2P) protocols recognized by Cisco's NBAR Protocol Discovery.

    • bittorrent
    • directconnect
    • edonkey
    • fasttrack
    • gnutella
    • kazaa2
    • napster
    • winmx

    If I've missed any, leave a comment below or use the Slaptijack Contact Form to update me.

    Thanks!

12. Using SPAN to Monitor a Switchport

    Posted on September 18, 2007 in Networking

    You'll find that some network problems can only be solved by sticking a packet sniffer on the network and seeing what the packets are doing. In a switched environment, this will not work properly since each port is configured to only broadcast traffic destined for the MAC addresses it has …

13. Set the Cisco Interface Description

    Posted on September 17, 2007 in networking

    One of my pet peeves is Cisco switch and router interfaces that remain unlabeled. There is nothing worse that trying to debug a network problem when the problematic interface is unlabeled. Instead of spending valuable time working on the actual problem, you've got to trace down where this cable goes …

14. Finding Cisco Neighbors with SNMP

    Posted on September 11, 2007 in Networking

    I've been in the situation before were I needed to discover the neighbors of a Cisco device programmatically. This is useful in a case where you want to crawl a network without hard-coding a list of devices into your script. By default, all Cisco devices have Cisco Discovery Protocol (CDP …

15. Basic Cisco SNMP Security (v1/v2)

    Posted on September 10, 2007 in Networking

    If you are at all familiar with <acronym title="Simple Network Management Protocol">SNMP</acronym>, you've probably heard of "community strings". Community strings are similar to passwords. They define and grant access to a device's <acronym title="Management Information Base">MIB</acronym>. If you've used SNMP in conjuction with a …