Mail servers

[Walt Howard]

In article <blkb9k$1sdj$1 at sf1.isc.org>,
Gadget Williams  <dombidcorp at ameritech.net> wrote:
>Never assume that ICMP is going to be a valid method to diagnose
>problems.

So far, so good.

>Most firewalls should be dropping that garbage.

No they shouldn't.  Drop some of it, OK.  Rate-limit it, surely.  But if
you drop all of it, you lose things like the ability to do path MTU
discovery.  ICMP exists for good reasons, and you SHOULD (in the RFC2119
sense) use it, carefully.

>I am amazed that Yahoo still let's you ping it...

Maybe they have concluded that there are more pros than cons to ICMP
echos.


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