Networks dropping all ICMP

Tue Sep 9 17:28:05 UTC 2003

On Tue, 9 Sep 2003, Andrew Staples wrote:

> A certain network last week decided to drop *all* icmp traffic across its
> network for an indefinate period of time.  They did this to reduce the
> effects of Nachi.  Apparently (their) Redback DSL concentrators cannot
> filter only 92 byte packets, it's all or none.
> Does anyone else care to respond publicly or privately with data about other
> networks filtering all icmp  traffic, not just malformed icmp?  I'd like to
> compile a list for troubleshooting, as these decisions are breaking things
> for some customers.

All? As in ... breaking path mtu discovery?