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Using Cisco ACS to limit commands (Shell Command Authorization Sets)
We have a situation where we have a group that manages some switches for us. In the past, we have created different username/passwords and en password for these switches so that we can’t log into our...
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Converting Putty SSH keys to SecureCRT keys
Use these steps if you have SSH keys that were created with PuttyGen and you now wish to use them in SecureCRT. 1. Open PuttyGen and load your private key 2. Select Conversions and export the key to...
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Cisco ASA Static command to create a translation
In ASA 8.2 static (real,mapped) mapped, real static (dmz,outside) 1.1.1.1 192.168.45.50 netmask 255.255.255.255 (Connections to 1.1.1.1 would be translated to the DMZ host) static (dmz,inside)...
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Running a basic BIND DNS Server
Install BIND in a chroot environment. yum install bind bind-chroot bind-libs bind-utils caching-nameserver -y ==== ==== [root@hostname etc]# cat named.conf options { directory “/etc”;...
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Cisco bug(?) verify command on 3750 switch
The other day, I had to reload an IOS image on a switch via rommon mode. After the image file copied over, I entered the verify command to verify the file was good. I got the below message and it was a...
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Cisco 3750 switch with a failing ASIC chipset
We lost IP connectivity to the switch. The switch was still passing frames (Layer 2 OK). Console didn’t work. IP connectivity came in and out (every 2 hours or so). When I could SSH into it, I saw this...
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Configuring MAC address filtering with WLC via Cisco ACS 4.2
Read this Cisco link: http://www.cisco.com/en/US/tech/tk722/tk809/technologies_configuration_example09186a008084f13b.shtml The Cisco article provides all the details you need to setup this up. You may...
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Config-register 0x2101
0x2101 Boots the first system image in onboard Flash memory. 0x2102 Autoboots using image(s) specified by the BOOT environment variable. If more than one image is specified, the switch attempts to boot...
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Determining the manufacture date
sh ver, the serial number will tell you: ABC – Factory code NN – Year of manufacture NN – Week of manufacture The year of manufacture is based on the year 1996. So if your number is 16 then you add...
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The Wonderful awk command
I use awk quite a bit to parse output from a Cisco device. cat filename | awk ‘{ print $1 }’ I had to parse from right to left today and learned about NF cat filename | awk ‘{ print $(NF-1) }’ However...
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