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Config snippets : Timezones for Cisco devices

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One thing which came handy for me was list of timezones I can use on Cisco devices. That came very useful during NTP deployment. So, here is is… timezones available for use on Cisco platform.

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Config snippets : Setting NTP server on Cisco IOS device

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Quick config snippet to setup external NTP server to synchronize time on Cisco IOS router.

labisr-01(config)#ip name-server 4.2.2.2
labisr-01(config)#ntp server 0.europe.pool.ntp.org
Translating "0.europe.pool.ntp.org"...domain server (4.2.2.2) [OK]
labisr-01(config)#clock timezone GMT 0
labisr-01(config)#
Please note that first I setup nameserver on router to be able to resolve NTP server FQDN.

Once NTP server is set we can check status of it:

labisr-01#sh ntp associations
address         ref clock     st  when  poll reach  delay  offset    disp
*~88.191.227.26    82.197.188.130    3    37    64  377    38.7    2.04     1.4
* master (synced), # master (unsynced), + selected, - candidate, ~ configured
labisr-01#
labisr-01#sh ntp status
Clock is synchronized, stratum 4, reference is 88.191.227.26
nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**18
reference time is D442C30E.7A93ED17 (22:58:22.478 GMT Mon Nov 5 2012)
clock offset is 2.0449 msec, root delay is 71.69 msec
root dispersion is 61.25 msec, peer dispersion is 1.36 msec
labisr-01#
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How-To : Use Raspberry PI as Wireless Access Point

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Here is how to turn Raspberry PI with Linksys WUSB100 v2.0 adapter and Raspbian into wireless access point. This might be handy for conference rooms where you have wired connection, but wireless signal is too low. Just quick setup on Raspberry, plugin the cable and you have wireless available.

Install required packages

apt-get install firmware-ralink wireless-tools hostapd bridge-utils

Modify /etc/network/interfaces to add bridge interface

auto lo br0

iface lo inet loopback
iface eth0 inet manual

allow-hotplug wlan0
iface wlan0 inet manual

iface br0 inet dhcp
bridge_ports eth0 wlan0

Once network configuration is modified reboot Raspberry PI.

Create /etc/hostapd/hostapd.conf file to define access point configuration

interface=wlan0
driver=nl80211
bridge=br0
country_code=PL
ieee80211d=1
ssid=raspb3rry-wifi
hw_mode=g
channel=6
wme_enabled=0
macaddr_acl=0
auth_algs=1
wpa=2
wpa_passphrase=raspberry123
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP

Add configuration information to /etc/default/hostapd

That will make hostapd daemon to start automatically each time Raspberry PI will bootup.

DAEMON_CONF="/etc/hostapd/hostapd.conf"
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Tips & Tricks : Apache2 autostart on openSUSE 13.1

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In order to have Apache2 started automatically after reboot use:


systemctl enable apache2.service

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Config snippets : Cisco : Resetting interface statistics on Catalyst

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Recently I went through troubleshooting of Site-to-Site Layer-2 link. One of the things we did during troubleshooting of that link was checking interface statistics for interfaces which were connecting two geographical sites together.

Below quick overview how ot check and reset port statistics if required during troubleshooting process.

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Apple iOS6 post upgrade welcome wizard screenshots

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At least with Apple iOS 6 upgrade process didn’t cause headaches (like previous iOS’ upgrades :)). For those who wants to see what happenes with iPad after upgrade here are screenshots of welcome wizard which shows after upgrade is completed.

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Tips & Tricks : xcrun: error after upgrading to macOS Mojave

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After upgrading to macOS Mojave you might experience following error when trying to run some command line tools like git, for example:

xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

To resolve that run those commands in Terminal:

sudo xcode-select --switch /Applications/Xcode.app
sudo xcode-select --switch /Library/Developer/CommandLineTools

Issue should be resolved.

 

 

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Code snippets : Handy wmic commands

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Some handy wmic commands which might be helpful when automating OS deployment:

wmic bios get serialnumber
wmic computersystem get manufacturer
wmic computersystem get model
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Configuring room-type resource mailbox on Exchange 2007 in auto accept mode

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Mailboxes created for conference rooms (on Exchange 2007 Recipient Type : Room Mailbox) by default has disabled auto accept for calendar appointments. That causes issue when people trying to book room as all appointments show as tentative and manual interaction/accept is required. In order to streamline process and make it more handy for people (in case nobody is assigned to control room bookings) you can enable auto accept feature, so all appointments will be accepted automatically. To do that use PowerShell:

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Apps : Cisco7PCF for Android

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Just released small app for Android platform. This app allows to decrypt type 7 password from Cisco devices as well as passwords from Cisco VPN profiles (PCF files).

Password which can be recovered using this app:

  • wireless keys fro Cisco access points,
  • RADIUS/TACACS shared secrets
  • NTP authentication keys
  • Enable passwords (NOT enable secrets, which are stored using MD5)
  • enc_GroupPwd – VPN group password from PCF file
  • enc_UserPassword – VPN user password from PCF file

You can find app in Google Play:

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