On Mon, May 14, 2001 at 11:46:05AM -0400, Christopher A. Woodfield wrote:
Reverse DNS by itself is insufficient for authentication, but enforcing matching forward and reverse DNS entries is much more reliable (no substitute for secret-based or cert-based authentication, but a good "front door" for something like tcp wrappers). at last check, tcpd and sshd can both be configured to block connections without matching forward/reverse records.
No. This is joke security, as is any security that relies on hostnames. TCP wrappers is basically worthless as a security measure unless you are using IP-based rules. And even then, it's deprecated in favor of kernel firewalling (In Linux) or ipfilter (on BSD's and other platforms that support it). --Adam