<?xml version='1.0'?>

<reference anchor='RFC1191'>

<front>
<title>Path MTU discovery</title>
<author initials='J.' surname='Mogul' fullname='Jeffrey Mogul'>
<organization>Digital Equipment Corporation (DEC) , Western Research Laboratory</organization>
<address>
<postal>
<street>100 Hamilton Avenue</street>
<city>Palo Alto</city>
<region>CA</region>
<code>94301</code>
<country>US</country></postal>
<phone>+1 415 853 6643</phone>
<email>mogul@decwrl.dec.com</email></address></author>
<author initials='S.' surname='Deering' fullname='Steve Deering'>
<organization>Xerox Palo Alto Research Center</organization>
<address>
<postal>
<street>3333 Coyote Hill Road</street>
<city>Palo Alto</city>
<region>CA</region>
<code>94304</code>
<country>US</country></postal>
<phone>+1 415 494 4839</phone>
<email>deering@xerox.com</email></address></author>
<date month='November' day='1' year='1990' />
<abstract>
<t>This memo describes a technique for dynamically discovering the maximum transmission unit (MTU) of an arbitrary internet path.  It specifies a small change to the way routers generate one type of ICMP
 message.  For a path that passes through a router that has not been so changed, this technique might not discover the correct Path MTU, but it will always choose a Path MTU as accurate as, and in many cases more accurate than, the Path MTU that would be chosen by current practice.</t></abstract></front>

<seriesInfo name='RFC' value='1191' />
</reference>
