You're right that the answer to my question was IPV6 (I didn't have
it compiled into the previous kernel). You're wrong that a port
need not be open to receive connections. You will note in the
log excerpt below that these are connection *attempts*, not actual
connections.
On Tue, Dec 19, 2000 at 01:51:04PM -0500, Hasan Azam Diwan wrote:
> To answer your first question, a port need not be open in order to receive
> connections. To answer your second, these appear to be IPv4 addresses
> encapsulated as IPv6 addresses.
> > Dec 19 12:21:04 cae88-102-101 /boot/kernel/kernel: Connection attempt to TCP
> > ::0001:25 from ::0001:1286
> > Dec 19 12:24:08 cae88-102-101 /boot/kernel/kernel: Connection attempt to TCP
> > ::0001:25 from ::0001:1299
> > Dec 19 12:27:13 cae88-102-101 /boot/kernel/kernel: Connection attempt to TCP
> > ::0001:25 from ::0001:1308
> > Dec 19 12:39:28 cae88-102-101 /boot/kernel/kernel: Connection attempt to TCP
> > ::0001:25 from ::0001:1336
> > Obviously, this machine is using log_in_vain, and it appears obvious
> > that these are local smtp transactions. It is _not_ obvious, at
> > least to me, why they are now being logged as if port 25 was not
> > open. Also, why the odd format in the addresses?
>
>
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