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2005
ACM

Inferring and Debugging Path MTU Discovery Failures

10 years 4 months ago
Inferring and Debugging Path MTU Discovery Failures
If a host can send packets larger than an Internet path can forward, it relies on the timely delivery of Internet Control Message Protocol (ICMP) messages advising that the packet is too big to forward. An ICMP Packet Too Big message reports the largest packet size – or Maximum Transmission Unit (MTU) – that can be forwarded to the next hop. The iterative process of determining the largest packet size supported by a path by learning the next-hop MTU of each MTU-constraining link on the path is known as Path MTU Discovery (PMTUD). It is fundamental to the optimal operation of the Internet. There is a perception that PMTUD is not working well in the modern Internet due to ICMP messages being firewalled or otherwise disabled due to security concerns. This paper provides a review of modern PMTUD failure modes. We present a tool designed to help network operators and users infer the location of a failure. The tool provides fairly detailed information about each failure, so the failure...
Matthew J. Luckie, Kenjiro Cho, Bill Owens
Added 26 Jun 2010
Updated 26 Jun 2010
Type Conference
Year 2005
Where IMC
Authors Matthew J. Luckie, Kenjiro Cho, Bill Owens
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