Ajax DNS (ajaxdns.com) Another DNS Whois Checking site

Ajax DNS http://www.ajaxdns.com Another DNS Whois Checking site with built with Ajax and with these utils:

  • DNS Tools
  • Live DNS
  • See all DNS records and Reverse DNS records for a domain.
  • Whois Search
  • Shows both registry and registrar results for a domain.
  • IP Whois
  • Shows the RIR (Regional Internet Registry) results for the IP address owner.
  • HTTP Headers
  • Shows server returned HTTP Headers for domain or IP address. Traverses redirects as well, great for troubleshooting .htaccess and Apache issues.
  • RBL Search
  • Searches several SPAM Listing databases to see if your domain and/or IP address is listed. Great to troubleshoot mail delivery problems.
  • Ping
  • Ping a domain or IP address to check if online.
  • DNS Traversal
  • Checks root nameservers for NS records for your domain. Helpful to troubleshoot propagation issues.

Error message when trying to add delegate access to a calendar

Error message when trying to add delegate access to a calendar:

The Delegates settings were not saved correctly.
Unable to activate send-on-behalf-of list.
You do not have sufficient permission to perform this operation on this object.

The links below will usually help with resolving this issue:


Add a static route in Linux

You want to get to a host on a network via a different gateway e.g. which
is connected to the .253 gateway and not your default .254 gateway.
Enter the following:
route add -net gw dev eth0

To make this permanent in Debian/Ubuntu edit the /etc/network/interfaces and add this line at the end:
post-up route add -net gw dev eth0

See man route for more on the route command in Linux.

Linux rev command reverses words

The rev utility copies the specified files to the standard output, reversing the order of characters in every line. If no files are specified, the standard input is read.

This utility can come in handy with shell scripts or just thinking up passwords and mixing stuff together. Note, use of a password generator is far better than reversing words.

[email protected]:~$ rev
I am reversing these words
sdrow eseht gnisrever ma I

Multi Tail is extremely useful!

Multi Tail is best Linux utility I found so far this year and I think it’s going to be hard to beat!

With multi tail you can view logs from two different sources and display them in a multi window arrangement. So you think big deal I can do this with multiple terminal windows running… but what if you are running a system without a X-Window envirnoment? I thought so!!

This is very handy for servers that should really not have a Window manager installed and/or if you are sshing in frm another box.

Official details from the site http://www.vanheusden.com/multitail/

MultiTail lets you view one or multiple files like the original tail program. The difference is that it creates multiple windows on your console (with ncurses). It can also monitor wildcards: if another file matching the wildcard has a more recent modification date, it will automatically switch to that file. That way you can, for example, monitor a complete directory of files. Merging of 2 or even more logfiles is possible. It can also use colors while displaying the logfiles (through regular expressions), for faster recognition of what is important and what not. It can also filter lines (again with regular expressions). It has interactive menus for editing given regular expressions and deleting and adding windows. One can also have windows with the output of shell scripts and other software. When viewing the output of external software, MultiTail can mimic the functionality of tools like ‘watch’ and such.

As shown below I’m looking at all new TCP connections and their state changes using netstat while in the other window displaying the merged access and error logfiles of apache:

Some Examples:
Merge 2 logfiles in one window:
multitail /var/log/apache/access.log -I /var/log/apache/error.log

Show 3 logfiles in 2 columns:
multitail -s 2 /var/log/apache/access.log /var/log/messages /var/log/mail.log

Show 5 logfiles while merging 2 and put them in 2 columns with only one in the left column:
multitail -s 2 -sn 1,3 /var/log/apache/access.log -I /var/log/apache/error.log /var/log/messages /var/log/mail.log /var/log/syslog

Merge the output of 2 ping commands while removing “64 bytes received from” from only 1 of them:
multitail -l “ping” -ke “64 bytes from” -L “ping”

Show the output of a ping-command and if it displays a timeout, send a message to all users currently logged in:
multitail -ex timeout “echo timeout | wall” -l “ping”

In one window show all new TCP connections and their state changes using netstat while in the other window displaying the merged access and error logfiles of apache:
multitail -R 2 -l “netstat -t” /var/log/apache/access.log -I /var/log/apache/error.log

As the previosu example but also copy the output to the file netstat.log:
multitail -a netstat.log -R 2 -l “netstat -t tcp” /var/log/apache/access.log -I /var/log/apache/error.log

Show 2 logfiles merged in one window but give each logfile a different color so that you can easily see what lines are for what logfile:
multitail -ci green /var/log/apache/access.log -ci red -I /var/log/apache/error.log

Juniper Debug utility

The debug utility is one of the most valuable tools you have to use for troubleshooting Juniper firewalls.

Turn on debuf buffer
set console dbuf [Enter]

Set a filter to check traffic coming from
set ffilter src-ip [Enter]

Turn on debug flow
debug flow basic [Enter]

Turn off debug
undebug all [Enter]

Ensure that you turn off debug after you have finished troubleshooting, otherwise you will see a performance hit on the device.

There are many more options and parameters to choose from, see the Juniper KB Article link:
Knowledge Base ID: KB5536