IESG Advice from Experience with Path MTU Discovery

In the course of reviewing the MTU Discovery protocol for possible elevation to Draft Standard, a specific operational problem was uncovered. The problem results from the optional suppression of ICMP messages implemented in some routers. This memo outlines a modification to this practice to allow the correct functioning of MTU Discovery.

[1]  Stephen E. Deering,et al.  Path MTU discovery , 1990, RFC.