Re: [tlug] Ping vs www server

["Stephen J. Turnbull" <stephen@example.com>]

Josh Glover writes:

 > 2. Public servers should drop echo message types (0, IIRC) on the
 > floor while dealing with the rest of ICMP

I don't get this.  Public servers can be pinged via TCP on at least
one port by definition.  "Echo" is a tiny part of the stack, and it's
way low (technically, ICMP is encapsulated in IP same as UDP or TCP,
but considered to be part of IP rather than a higher level, see RFC
1122).  If you don't trust this part of your stack, what can you
trust?

It's the other parts of ICMP that are hard.