Becoming a Cisco CCIE Network Ninja
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U.U.U Ping Response
By Arden Packeer, CCIE #20716⋅ May 27, 2008 ⋅ 
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Ever wonder why you get a U.U.U ping response time instead of a UUUUU for icmp unreachable messages? Well wonder no more! Packetlife has a great article dissecting the U.U.U ping response. I knew about icmp rate-limit but I never put two and two together before reading the article. Awesome!
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© 2008 Arden Packeer. All rights reserved. The opinions expressed herein are my own personal opinions and do not represent my employer's view in anyway. This material is not sponsored or endorsed by Cisco Systems, Inc. Cisco, Cisco Systems, CCIE and the CCIE Logo are trademarks of Cisco Systems, Inc. and its affiliates 
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