As per Relevance of the word software, we have this rfc below:
Network Working Group S.
Request for Comments: 1435 ftp
March 1993
IESG Advice from Experience with Path MTU
Status of this
This memo provides information for the Internet community. It
not specify an Internet standard. Distribution of this memo
unlimited
In the course of reviewing the MTU Discovery protocol for
elevation to Draft Standard, a specific operational problem
uncovered. The problem results from the optional suppression of
messages implemented in some routers. This memo outlines
modification to this practice to allow the correct functioning of
Discovery
Advice on the Deployment of Path MTU Discovery
While reviewing the Path MTU Discovery Protocol for Draft
[RFC1191], the Internet Engineering Steering Group (IESG)
aware from the reports of various implementors that some vendors
added to their routers the ability to disable ICMP messages
by the router. This is to protect older BSD hosts, which would
all connections to a host it found an ICMP message on any of
connections, even if it was a non-fatal ICMP message. While
protects older BSD hosts, it causes MTU discovery to fail in
silent, hard to diagnose way
From the descriptions the IESG has obtained, adjusting the routers
continue to send ICMP message Type 3 code 4 (destination unreachable
don't fragment (DF) bit sent and fragmentation required) even
they have their "don't send ICMP messages" switch turned on
allow path MTU discovery to work but not effect older BSD hosts
since they never set the DF bit in their packets
Author's
This document was the result of an IESG meeting discussing
Discovery. This author was chosen to write the document as
Internet Engineering Task Force (IETF) Internet Area Director
Knowles [Page 1]
RFC 1435 IESG Advice from Experience with Path MTU Discovery March 1993
[RFC1191] Mogul, J., and S. Deering, S., "Path MTU Discovery",
RFC 1191, DECWRL, Stanford University, November 1990.
Security
Security issues are not discussed in this memo
Author's
Stev
ftp
2 High
North Andover, Ma, 01845
EMail: stev@ftp.
Knowles [Page 2]
if you see any problems within the linking, don't worry be happy,
this is version 0.1 of the Relevance System and you gotta expect some crappy subroutines sometimes,
just be content we did not write this in Java, which would have made this "bigger and better" HAHAHHA.
RFC documents can be found at I.E.T.F.
Relevance System Copyright © 2002 Spectrum WorldResearch
other technical nosh by ServerMasters Corporation
collaboration of BobX
