Adam McKenna wrote:
On Tue, Sep 13, 2005 at 04:31:05PM -0700, william(at)elan.net wrote:
Telnet option negotiation is at Layer 7 after TCP connection has been
established. Firewalls typically don't operate at this level (TCP session
is Layer 4 if I remember right) and would refuse or reject (difference
type of ICMP response) based solely on attempt to connect to certain
ip or certain TCP/UDP port.
Application layer firewalls have existed for at least 6 years.
AAAAAAAAAAAGGGGGGGGGGHHHHHH!
But the point is that you would still establish a TCP connection
before a MTA, firewall, IPS, or whatever could know it was telnet!
The FEMA address that started this whole thing was timing out. You
can tell the difference between a telnet filter and something
completely, silently blocking 25/tcp.
CAN THIS DIE NOW? Pulllleeeeeese...
--
Crist J. Clark [EMAIL PROTECTED]
Globalstar Communications (408) 933-4387
