Posted on 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 …
Posted on 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 …
Posted on 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 …
Posted on 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 …
Posted on in voice
Posted on 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 …
Posted on 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 …
Posted on 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 …
Posted on 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.
Posted on 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 …
Posted on 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 …
Posted on 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 …
Posted on 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 …
Posted on in Networking
The following are the Peer-to-Peer (P2P) protocols recognized by Cisco's NBAR Protocol Discovery.
If I've missed any, leave a comment below or use the Slaptijack Contact Form to update me.
Thanks!
Posted on 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 …
