Releasing IP Addresses in WHM/Cpanel
Apache
By default Apache listens to every interface coming into the machine by listening to 0.0.0.0:80/443. Normally you could edit the httpd.conf file directly in order to change the listen line, however that may cause problems with Cpanel’s automation.
To acheive this log into Webhost Manager and find Service Configuration followed by Apache Configuration. Then click on Reserved IPs Editor.
Here you will need to check the boxes of the IP addresses you do NOT wish for Apache to use. Once you save your selections, a new configuration file will be configured to listen on all the other IPs that were not checked. This will allow other services such as alternate web browsers to listen on those IP addresses without conflicting with Apache.
Webhost Manager
Navigate to IP Functions, followed by Show/Edit Reserved IPs. Here you should check the same IPs that were selected in the Apache Reserve list above.
Once this is done WHM/Cpanel will avoid using those IP address when setting up new accounts and services.
Email Addresses Disallowed characters
cPanel™ 11.25 expands the range of acceptable characters in the local part of email addresses to be closer in line with RFC 5322. Addresses created and managed by cPanel™ have the following limitations:
• Disallowed characters that have special meaning to the shell: &’`*|/
• Disallowed characters due to use as data value separators: @:%
Prior versions of cPanel™ only accepted the dash (-), underscore (_), and period (.) in the local part of an email address.
Interfaces that accept an email address for contact purposes should accept all RFC 5322 characters in the local part.
When upgrading to cPanel™ 11.25, email accounts with quotas larger than 2 GB will be upgraded to unlimited. This is due to limitations with Exim and Courier in handling larger quota values.
ICANNpolicies for Assigning Dedicated IP Addresses to Subdomains
ICANN requires that a website owner meet one of 2 simple requirements before dedicating an IP address to his or her domain. The user’s domain or subdomain must either:
* Require an SSL Certificate — Generally, these certificates are used for e-commerce. SSL Certificates ensure visitors that they are sharing sensitive information on a secure connection with the appropriate domain.
* Run an anonymous FTP site.
Assigning a dedicated IP address for any other reason than the reasons listed above is a violation of ICANN’s terms.
For more information about ICANN policies, you can visit their website here. http://www.icann.org/en/policy/
IPv6 Addresses Types
IPv6 addresses are broadly classified into three categories:
1) Unicast addresses A Unicast address acts as an identifier for a single interface. An IPv6 packet sent to a Unicast address is delivered to the interface identified by that address.
2) Multicast addresses A Multicast address acts as an identifier for a group/set of interfaces that may belong to the different nodes. An IPv6 packet delivered to a Multicast address is delivered to the multiple interfaces.
3) Anycast addresses Anycast addresses act as identifiers for a set of interfaces that may belong to the different nodes. An IPv6 packet destined for an Anycast address is delivered to one of the interfaces identified by the address.
Removing a default domain from one of your IP addresses in Plesk
Once you have set a domain to be the default domain for a specific IP address in Plesk, you will not be able to deselect that particular domain. At this point you only have the option of switching the IP address to another domain on your server.
If you would like to do this there is a solution using MySQL commands. You can manually set the default_domain_id to zero for a specific IP address directly in the Plesk database. Make sure to replace IPADDRESS with your address.
# mysql -uadmin -p`cat /etc/psa/.psa.shadow` -Dpsa -e “UPDATE IP_Addresses SET default_domain_id = 0 WHERE ip_address = ‘IPADDRESS’;”
The following command will remove the default domain setting for all IP addresses:
# mysql -uadmin -p`cat /etc/psa/.psa.shadow` -Dpsa -e “UPDATE IP_Addresses SET default_domain_id = 0;”
Then you need to use the command ‘websrvmng’ to apply changes:
# /usr/local/psa/admin/sbin/websrvmng -a -v
Reference: http://parallels.com/
