If you need to find the time to live on a DNS record in windows you can click
start -> administrative tools -> DNS
Click View -> Advanced
Now right click on your record and click properties
The TTL will be displayed
Alternatively
nslookup -q=a -debug www.mydomain.com
nslookup -q=mx -debug email.mydomain.com
nslookup -q=ns -debug ns.mydomain.com
In linux you can use the dig command
Tuesday 26 February 2013
Monday 25 February 2013
investigating public IP addresses with ripe.net
If you come across a public IP address but your not sure what it is you can use tools such as ripe.net to investigate. In this example, I'm going to attempt to look up yahoo.com (98.138.253.109).
Go to http://www.ripe.net/
In the RIPE database section enter the IP address you want to investigate and click search.
If the details are held by RIPE they will be displayed
Sometimes the IP details are held by another provider
In that case the provider will be listed
In my case it was http://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.xml
I went to iana.org. My IP starts with 98 the page tells me this is held by http://whois.arin.net
I went to http://whois.arin.net/ui entered the IP address into the search bar and click search
This brought up the details of who owns that IP address which of course was Yahoo inc.
There are plenty of other web applications that help you get this information I've found that http://network-tools.com to be useful.
Go to http://www.ripe.net/
In the RIPE database section enter the IP address you want to investigate and click search.
If the details are held by RIPE they will be displayed
Sometimes the IP details are held by another provider
In that case the provider will be listed
In my case it was http://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.xml
I went to iana.org. My IP starts with 98 the page tells me this is held by http://whois.arin.net
I went to http://whois.arin.net/ui entered the IP address into the search bar and click search
This brought up the details of who owns that IP address which of course was Yahoo inc.
There are plenty of other web applications that help you get this information I've found that http://network-tools.com to be useful.
Thursday 14 February 2013
Error 113 (net::ERR_SSL_VERSION_OR_CIPHER_MISMATCH): Unknown error in google chrome when connecting to Cisco ASDM
Looks like the default ssl encryption is set to des-sha1.
Run the following to see what yours is set to:
#sh run | i ssl encryption.
I was connecting my laptops ethernet port to the management port on the ASA.
My IP address settings were set to obtain. The ASA gave me an IP address. I connected to the ASA with the console cable to run the commands.
des has been broken for ages now. Looks like chrome won't connect unless you use a good encryption. I did the following to resolve:
#conf t
#ssl encryption aes128-sha1 (you can use higer if you want)
#wr mem
Now open chrome and go to https://192.168.1.1/admin
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