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The Crucial Blog - Archive

June 26, 2009

How to setup logging on tftp on Linux

Set up logging by opening /etc/xinetd.d/tftp and adding the -v (verbose) option to server_args, and then you can tail /var/log/messages to see the results.

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Filed under: Uncategorized by — aaron @ 8:03 am


May 20, 2009

Cisco ASA Error: ASDM is unable to read the configuration from the ASA.

If you are receiving the following error:

ASDM is unable to read the configuration from the .

Then you can try the following:

  1. In ASDM: File -> Clear ASDM Cache
  2. File -> Clear Internal Log Buffer
  3. File -> Refresh ASDM with the Running Configuration of the Device
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Filed under: Uncategorized by — aaron @ 4:47 pm


April 3, 2008

Configuring a Range of Ports on a Cisco Switch or Router

You can use the following to configure a range of ports:

interface range FastEthernet 0/15 – 48
<commands here>
exit

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Filed under: cisco by — aaron @ 1:40 am


February 21, 2008

How to view current configuration on a Cisco Pix 520-UR Firewall

First console into the switch, then do the following:

> enable
Password: ************
firewall# configure terminal
firewall(config)# wr term
Building configuration…
: Saved
:
Version 5.0(2)
nameif ethernet0 outside 0
nameif ethernet1 inside security100
nameif ethernet2 pix/intf2 security10
….

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Filed under: Uncategorized by — aaron @ 1:11 am


February 21, 2008

Accessing a Cisco Switch or Router via Serial Port on Linux Using Minicom

If you need to access a swith or router on (Redhat, CentOS, Debian, etc) then install minicom, and do the following.

Firstly you can check which serial ports on your computer are available:

dmesg | grep tty
ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A

Then run minicom:

minicom /dev/ttyS0

Type:

Ctrl + A Z

Then type ‘o’ (the letter, not number) and select ‘Serial port setup’ to configure minicom. Here is a sample configuration of what you want your configuration to look like:

A – Serial Device : /dev/ttyS0
B – Lockfile Location : /var/lock
C – Callin Program :
D – Callout Program :
E – Bps/Par/Bits : 9600 8N1
F – Hardware Flow Control : Yes
G – Software Flow Control : No

To get to here, please read the following:

Ensure the correct serial port is being utilized by pressing A, the port you will usually be using is /dev/ttyS0

Press E to configure bit rate, then select E again, and then Q and Enter.

Ensure Hardware Flow Control is on, and Software Flow Control is off.

If you are having issues, try exiting and re-opening minicom, or disconnecting and reconnecting your console cable.

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Filed under: Uncategorized by — aaron @ 12:25 am




     

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