Thanks for the answer!
There is nothing similar to ip_loopback_bypass
in Solaris.
The be all and end all of Unix OSes has no such thing?!? Imagine :)
When I run netstat -i, I do see packets that are "passed through" the localhost interface.
Is there a real entity in the kernel which is the loopback interface, may it be a driver (seems not to be one), STREAMS module, anything? Does it contain anything beyond statistics ?
I believe that it is nothing more than a figment of the imagination of the IP code. There is no other "real" entity.
Now, what happens if one unplumbs lo0: and assigns 127.0.0.1 to a "real" interface (say as an alias) I have no idea...of course without the loopback bypass it may still not get you where you want to go.
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