Category Archives: Systems

Systems

How to Setup a TFTP Server Under CentOS/RHEL 6

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Why bother with tftp?

Many network devices such as Cisco routers and switches use tftp in order to download their IOS config updates. tftp can also be used for network based installs or for booting up diskless systems. Knowing how to setup a tftp server comes in quite handy when circumstances like these arise.

Getting started . . .

The Network Topology

Let’s say we’re dealing with a private network– 192.168.100.0/24. We’ll designate our tftp server and tftp test client as 192.168.100.5 and 192.168.100.105 respectively. You will need superuser privileges on both your server and client in order to successfully perform all of these commands.

Get the Necessary Packages

Log on to 192.168.100.5 and download the necessary programs; make sure they survive reboots:


# yum install tftp-server xinetd
# chkconfig tftp on Continue reading How to Setup a TFTP Server Under CentOS/RHEL 6 →
Systems, Uncategorized

ipfilter and ipv6

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For people running older versions of Solaris, like 8/9, the firewall of choice to install was ipfilter. Now, with Solaris 10 it has become the default, built-in with the OS. I wanted to do a short post about adding configuration settings for ipv6 and plan to cover ipv4 in detail in a later post.

One thing to note is that ipfilter must run it’s ipv6 rules under a separate file. In Solaris 10, the default location for the filter rules is in /etc/ipf and the firewall rules are located in the files ipf.conf and ipf6.conf for ipv4 and ipv6 respectfully. Here is a sample of the current file on one of my servers,


#
# ipf6.conf
#
# IPv6 Filter rules to be loaded during startup
#
# See ipf(4) manpage for more information on
# IP Filter rules syntax. Continue reading ipfilter and ipv6 →