Jim Nissen writes: > No, asking simply because the Solaris tunables guide list both those TCP > settings that are changed via ndd and other that are /etc/system. > Customer's asking me if exclusive IP will allow for a NGZ to have its > own /etc/system TCP tunables, or if they are global.
/etc/system is still global because there's still only one system kernel. That's the essence of zones. /etc/system and ndd are unrelated, which is what confused me here. Except for a few cases where there are "mirrored" bits (and likely things that are actually bugs), you can't set ndd variables in /etc/system, and you can't set /etc/system variables via ndd, and this is by design. /etc/system works by scribbling on top of kernel storage named by symbols in the object files. It's essentially equivalent to "/W" in mdb during the boot process -- you're writing directly to a variable, and perhaps even one that's declared "static" by the original author. ndd is more programmatic. It opens the named device node (e.g, /dev/tcp) and issues an undocumented ioctl. The driver (and any STREAMS modules in between) then gets the ioctl and can decide to do anything it wants with it. Sometimes, it sets a variable somewhere, or perhaps modifies multiple variables. Other ndd ioctls cause other functions to be called, locks to be taken, and other work done. Unlike /etc/system, the possibilities are endless. -- James Carlson, Solaris Networking <[EMAIL PROTECTED]> Sun Microsystems / 35 Network Drive 71.232W Vox +1 781 442 2084 MS UBUR02-212 / Burlington MA 01803-2757 42.496N Fax +1 781 442 1677 _______________________________________________ zones-discuss mailing list zones-discuss@opensolaris.org
