Sep 202011

As a system administrator, every now and then you may come across situations wherein your SAN admin presents you some storage (LUNS) and you can’t find where the hell has it gone. The following are some of the ways to list the LUNS presented on a controller or all the controllers on the server.
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Nov 082010

tcpdrop is a free utility to drop an established TCP connection in Sun solaris. It is a port of the tcpdrop utility from FreeBSD and openBSD. tcpdrop doesn’t do what it says on the tin and nothing more but does it very well. tcpdrop works in Solaris 10,9,8

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Oct 152009

Installing Perl modules in Sun Solaris is not as straight forward but is not very difficult as well.  Perl module installations in Sun Solaris needs GNU Make rather than the default make tool installed. And, requires using perlgcc to build the Makefile.PL than the default perl binary.

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Jun 192009

In the past we have to mess around with the NDD commands and stats tools like kstat to find the network link status, speed, duplex information in Sun Solaris. With Solaris 10, this has become much easier with the dladm utility.

dladm is the admin utility for Data-Link Interface which helps to display informarthe like Link Status (UP/DOWN), Speed, Duplex, MTU, VLAN Tagged and crucially statistics of network traffic on each of the interfaces historically as well as in real time. dladm can also configure and admin Link Aggregation on multiple NICs which we will not focus here.
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May 122009

PCP is a very useful security and adminitration script that can help you quickly find Processes (PIDs) having particular TCP Port(s) open, TCP ports open by specific PIDs or even list all the TCP Ports open by all PIDs running on your system.

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Apr 242008

IP packet forwarding is the process of routing packets between network interfaces on one system. A packet arriving on one network interface and addressed to a host on a different network is forwarded to the appropriate interface.

In Solaris 10, IP Forwarding can be enabled or disabled using the routeadm & ifconfig commands as against the ndd commands in Solaris 9 and earlier. The advantage is the change dynamic and real-time and the change persist across reboot unlike the ndd command.

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Mar 222008

Do you you DHCP to get the IP Address for your Solaris Server or workstation then its worth understanding what your DHCP Agent by default requests for from the DHCP server and help avoid certain network issues like “unknown” hostname issue as I’ve descrbed here.

The DHCP Agent by default requests for the

Subnet Mask

Default Router


DNS Domain

Broadcast Address

Encapsulated Vendor Option (vendor specific information as described in RFC 2132)

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Mar 222008

If you are using DHCP to receive IP Address for your Sun Solaris system, you may end up with no hostname assigned to the system. This can be confirmed when there is no hostname at the prompt or if the output for the command “hostname” is as follows:

# hostname

or the /etc/hosts file has an entry as follows:

# cat /etc/hosts
# Internet host table
# localhost unknown # Added by DHCP

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