Archive for January, 2009

In the previous post I explained some basic stuff about IPv6 and how to configure IPv6 addresses on Cisco’s interfaces. Following this subject, I want to explain now how you can configure unicast dynamic routing protocols for IPv6 networks. The same as IPv4, the v6 generation of IP addresses supports...

Today, I had to deal with IPv6 configuration for my CCIE preparation and I said to write a small tutorial about IPv6 for it’s basic stuff. First of all IPv6 is not more complicated that IPv4, it just look like it is. Second, and this is my personal opinion, I think that as long as IPv4 will be...

Cisco Security Manager contains a vulnerability when it is used with Cisco IPS Event Viewer (IEV) that results in open TCP ports on both the Cisco Security Manager server and IEV client. An unauthenticated, remote attacker could leverage this vulnerability to access the MySQL databases or IEV server. Reat...

Sometimes, because of cost saving usually, the network engineers are forced to use a Cisco router as a firewall (instead of Cisco PIX or ASA). One of the big difference between router and firewall devices is that the ports have different characteristics. If on routers, ports are permitting by default...

I was explaining in the previous post what is the difference between optimal and suboptimal path and how to avoid the use of not such a good path in your routed environment. Also there I presented this so call “dirty trick” you can use to force the routing protocol to choose the path that...

Everywhere in the world people try to find the optimal path to achieve something.If we speak about roads, trips and in our case networking, choosing the best path to an end point can have only advantages. I took the term optimal / suboptimal path from the routing issues that can appear in the OSPF network...

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It has been a while since I didn’t post anything here, but it was holidays and I used that time to relax and rest after a year of work. Following this idea I wish you all “Happy New Year” and all the best in 2009. Today I planned to write about something easy to implement (just to get...