Posted on in Networking
If you need to disable spanning-tree on a particular VLAN in your Cisco-based network, use the following command:
Switch(config)# no spanning-tree vlan 13
This will disable spanning-tree on unlucky VLAN 13.
If you have some good examples of why you might want to disable spanning-tree for a VLAN, please …
Posted on in System Administration
While researching a problem with our Oracle Fast Recovery Area (FRA), I took note of the more useful commands I used. This is from Oracle 11g R2 with the Real Application Clusters (RAC) and Automatic Storage Management (ASM) options.
Show how much of the FRA is in use …
Posted on in Software
After a recent power event, I experienced this problem. None of our iPods were appearing in iTunes; even those that sync via wireless. My problem was solved on the macosxhints forums by sprale.
In Terminal:
cd ~/Library/Application\ Support/SyncServices/
rm Local
If you aren't comfortable in Terminal, you will …
Posted on in Networking
Not everyone has a great password maintenance process. If you run into a situation where the group pre-shared keys for your VPN are lost, you face the option of changing the existing key (and breaking any users that are currently working), or creating a new group with a new key …
Posted on in System Administration
If you are unfamiliar with Oracle and setting up your vCloud Director Oracle database, don't make the same mistake I made:
SQL> CREATE TABLESPACE "CLOUD_DATA" DATAFILE "/home/oracle/app/oracle/oradata/orcl/cloud_data01.dbf" SIZE 1000M AUTOEXTEND ON ;
CREATE TABLESPACE "CLOUD_DATA" DATAFILE "/home/oracle/app/oracle/oradata/orcl/cloud_data01.dbf …Posted on in Networking
On occasion, you may need to put your Cisco IPS into bypass mode. Bypass mode allows the IPS to pass traffic without inspecting it. This may be useful if you suspect the IPS is causing a problem, if you are going to run a one-time scan that would set the …
Posted on in system_administration
for id in \`find . -mtime +10 -name qf\\\* \| sed 's/\^....//'\`; do
mv qf\${id} /var/tmp/scott-20120104/ ;
mv df\${id} /var/tmp/scott-20120104/ ;
done
Posted on in Networking
When you get your brand new Cisco ASR1000 series router, Stateful Switchover (SSO) is disabled by default:
Router# show redundancy states
my state = 13 -ACTIVE
peer state = 1 -DISABLED
Mode = Simplex
Unit ID = 6
Redundancy Mode (Operational) = Non-redundant
Redundancy Mode (Configured) = Non-redundant
Redundancy State = Non Redundant
Enable SSO!
Router# config …Posted on in Software
I recently needed to tag the first 5,389 messages in a mailbox using Mutt. This is much easier than you might think.
shift-t - By default, the command to tag messages based on a pattern
is bound to shift-t. If you've changed this in your muttrc, use whatever
you've bound …Posted on in Networking
You've certainly noticed when look at individual BGP routes on your Cisco routers that the route is advertised to specific update-groups. It isn't obvious from that output just what those update-groups are.
Router#show ip bgp 8.8.8.8
BGP routing table entry for 8.8.8.0/24 …Posted on in Software
If you need to comment something out of your .vimrc, start the line with a double
quote (").
"autocmd BufRead *.xml :source ~/.vimrc.xml
It's embarrassing to admit how long it takes to find the answer to that question.
Posted on in System Administration
When I upgraded to OS X 10.7 (Lion), I started using the built-in IPSec VPN client rather than Cisco's VPNClient. I experienced problems immediately. At first it appeared that the connection was being made, but no traffic was passing. When I tried pinging by IP address, I found that …
Posted on in Software
I released a new version of my Google PageRank Tool for WordPress last week. Google recently changed the URL for PageRank information which necessitated a change in the plugin. The new plugin has been tested with WordPress 3.2.1.
You can download the latest version of the plugin from …
Posted on in Networking
This is an annoying problem:
Switch#write
startup-config file open failed (Not enough space)
Switch#dir nvram:
Directory of nvram:/
%Error opening nvram:/ (Function not implemented)
1048576 bytes total (1034573 bytes free)
Cisco Catalyst switches simulate NVRAM on their flash. Once in a blue moon, this simulated NVRAM will become …
Posted on in system_administration
If you're a frequent user of GNU screen on your Mac, you are probably tired of
using ctrl-a [ to enter scrollback mode. Adding the following lines to the
.screenrc configuration file in your home directory in order to scroll with
your mouse:
defscrollback 5000
termcapinfo xterm* ti@:te@
