Someone asked so lets walk through the overhead introduced when using IPSec with AES; it’s higher than you might think and I haven’t even factored in ISAKMP. Encryption really isn’t ‘my bag’ so if anything is wrong, do let me know; hopefully public scrutiny will mean I can truly rely on these figures. Take a […]
The post IPSec Bandwidth Overhead Using AES appeared first on Packet Pushers Podcast and was written by Steven Iveson.
In our last episode (it’s been two weeks!), we talked about P’s and Q’s. Now we’ll get down into a few details, and think through what is probably the simplest mechanism ever designed for finding alternate loop free paths through a two connected network: not-via. Let’s use the embedded network as an example. In this […]
On this Packet Pushers podcast, hosts Ethan Banks and Greg Ferro are joined by Petr Lapukhov for a discussion about his IETF draft on BGP SDN, co-authored with Edet Nkposong. Guests Russ White and Ivan Pepelnjak also join in the discussion, quizzing Petr about the details of the draft and how implementation has worked out thus far […]
The post Show 164 – Cool or Hot? Lapukhov + Nkposong’s BGP SDN appeared first on Packet Pushers Podcast and was written by Ethan Banks.
Ever curious regarding how two routers configured for OSPF become fully adjacent? The following diagram of the process was modeled directly from RFC 2328, and the steps described gleaned from the Routing TCP/IP Vol I book. Since we can see mention of a DR, this example must be based on a multi-access network.
As a senior network administrator, you receive complaints from server team that yesterday there were multiple short network cuts that impacted some very sensitive applications running in the data center. You investigate and find out that one of the level 1 network engineers performed some network changes. What went wrong?
Packet Design will be hosting a Product & Routing Webinar focused on Multicast on Wednesday, October 23 at 3pm CST. The event will feature Matt Sherrod, VP of Product Management, as its key speaker and will leave time after the live demonstration for Q&A.
For a table describing the different LSA types, check out the first post of this series.
In the first part of the series, we looked at LSA Types 1, 2, and 3 – Router, Network, and Network Summary, respectively. To move on to the next two LSA types, we need to bring in another Autonomous System (AS). In the diagram below, we’ve added R5 which has an interface in EIGRP AS 1, and is redistributing that into OSPF Area 4. The fact that R5 has an interface inside of the OSPF AS, as well as the EIGRP AS, makes R5 an Autonomous System Boundary Router (ASBR).
The EIGRP-oriented subnet that is being redistributed is considered an external route to the OSPF domain, so a Type 5 LSA, or ASBR External, is flooded into OSPF Area 4 containing a LSID and netmask of the subnet, plus the External Type. This important because it tells other routers whether or not to add the internal link costs within the OSPF domain to the metric to reach that subnet. A type 2 external route specifies that only the external cost is taken into consideration.
When R2 catches wind of Continue reading
The engineering world has a long standing tradition none of us should be too proud of: rudeness. There was, in fact, a time when I was working the phones on customer support that the general attitude was, “feel free to flame me when I ask a question, just answer the question in the flame.” Flames […]
One of my first experiences dealing with a technology customer involved a request to deliver and install a new PC and printer. During the process I expected I would need to educate the user on the features of Windows 3.1. This was before I ever really started working in technology in a full-time capacity. While […]
The post The Importance of Setting Expectations appeared first on Packet Pushers Podcast and was written by Paul Stewart.
How long will it take to transfer a 100MB file over an IPSec tunnel running across a dedicated 100Mbps Ethernet link? 1 Second? Fail! 8s? You’re getting warmer. It’s almost 8.5s without the IPSec and over 9s with it. What’s the big deal with a 1s difference? Well, extrapolate that increase, let’s say it’s 13%, and […]
The post TCP Over IP Bandwidth Overhead appeared first on Packet Pushers Podcast and was written by Steven Iveson.
Greetings fair ladies and kind sirs, I present yet another episode of Healthy Paranoia. In this episode we examine the notoriously mad, bad and dangerous to know; pentest dropbox. Joining Mrs. Y are some poètes maudits of the security realm, including; Taylor Banks, Dan Tentler, Kyle Stone, Nick Lennox and Jay James. A dropbox or […]
The post Healthy Paranoia Show 17: How Do I Pwn Thee? appeared first on Packet Pushers Podcast and was written by Mrs. Y.
