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Resolve IP Fragmentation, MTU, MSS, and PMTUD Issues with GRE and IPSEC – Cisco

Posted June 26, 2014 By Landis V

http://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/25885-pmtud-ipfrag.html

It seems somehow I’ve never managed to run across this particular article describing path MTU discovery (PMTUD) in conjunction with IPSec and GRE tunnels.  Scenario 10 is a particularly good and detailed description of how it can go, even taking into account situations common to PPPoE DSL connections which have an MTU of 1492 (the 1400-byte MTU link in the scenario would have the same effect).

Ran across this one while looking for any documentation/information about AT&T ignoring the DF/”don’t fragment” bit and proceeding to fragment at will, breaking path MTU discovery.  I’d love to find a way to get them to stop doing that on my connections, and just let the protocol work as it is supposed to.

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Filed in Cisco, Internet, Links | Tagged:

13 hot new open source projects | Network World

Posted June 24, 2014 By Landis V

http://www.networkworld.com/article/2358443/software/94947-13-hot-new-open-source-projects.html

Couple of pretty interesting pieces here.  I could see some handy graphing capabilities for network monitoring coming out of D3JS.

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Get Console – (cr)Apple and Android Serial Cables and Terminal Apps

Posted June 19, 2014 By Landis V

http://www.get-console.com

These look pretty slick, and useful.  Might have to pick one up sometime.

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Filed in Links, Technology, To Buy

Open PCI DSS Scoping Toolkit

Posted June 12, 2014 By Landis V

http://www.isaca.org/Groups/Professional-English/pci-compliance/GroupDocuments/OpenPCIScopingToolkit.pdf

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Using the Open Source DogTag Certificate Authority with ISE for BYOD | Cisco Technical Support Forum

Posted June 11, 2014 By Landis V

https://supportforums.cisco.com/blog/9913621/using-open-source-dogtag-certificate-authority-ise-byod

I tinkered with this at work, but found it lacking from a production standpoint.  This may be due in part to working outside my typical Debian-based comfort zone.  Will probably look at it again at home and see if it shows more promise with experience.

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Filed in Links, Linux, Networking, Security, Technology, Web Applications, Wireless | Tagged: ,

L7-filter, an application layer packet classifier for Linux

Posted May 29, 2014 By Landis V

http://l7-filter.clearfoundation.com/

Integrates with netfilter using QUEUE.  Interesting methodology, potentially quite useful.

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Filed in Internet, Links, Linux, Security

Homebrew Finds: Update: Building a Recirculating Draft Line Cleaning Pump

Posted May 15, 2014 By Landis V

http://www.homebrewfinds.com/2014/05/update-building-recirculating-draft.html

Have to build one of these, especially since I’m finally getting around to purchasing some real faucets.

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Filed in Food and Drink, Links | Tagged: ,
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