nanog mailing list archives
Re: mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?)
From: Adam McKenna <adam () flounder net>
Date: Tue, 13 Sep 2005 16:59:50 -0700
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. --Adam
Current thread:
- Re: Computer systems blamed for feeble hurricane response?, (continued)
- Re: Computer systems blamed for feeble hurricane response? Joseph S D Yao (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Eric A. Hall (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? William Allen Simpson (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Valdis . Kletnieks (Sep 13)
- Message not available
- Re: Computer systems blamed for feeble hurricane response? Mike Tancsa (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Suresh Ramasubramanian (Sep 14)
- Re: Computer systems blamed for feeble hurricane response? Mike Tancsa (Sep 14)
- mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) william(at)elan.net (Sep 13)
- mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) Roy Badami (Sep 13)
- Re: mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) william(at)elan.net (Sep 13)
- Re: mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) Adam McKenna (Sep 13)
- Re: mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) Crist Clark (Sep 13)
- Re: mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) Steven M. Bellovin (Sep 13)
- Re: mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) Dave Crocker (Sep 13)
- Re: mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) Joseph S D Yao (Sep 14)
- Re: mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) Robert E . Seastrom (Sep 14)
- Re: mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) Joseph S D Yao (Sep 15)
- Re: mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) Steven M. Bellovin (Sep 14)
- Re: mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) Joseph S D Yao (Sep 13)
- Re: mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) Tony Finch (Sep 14)
- Re: Computer systems blamed for feeble hurricane response? Christian Kuhtz (Sep 13)