Matt Emmerton wrote:
Hi guys.
What's the difference between net.inet.ip.forwarding and
net.inet.ip.fastforwarding ?
What's the role of net.inet.ip.fastforwarding ?
From inet(4):
IPCTL_FORWARDING (ip.forwarding) Boolean: enable/disable
forwarding
of IP packets. Defaults to off.
IPCTL_FASTFORWARDING (ip.fastforwarding) Boolean: enable/disable the
use
of fast IP forwarding code. Defaults to off.
When
fast forwarding is enabled, IP packets are for-
warded directly to the appropriate network inter-
face with a minimal validity checking, which
greatly improves the throughput. On the other
hand, they bypass the standard procedures, such
as
IP option processing and ipfirewall(4) checking.
It is not guaranteed that every packet will be
fast-forwarded.
This quote is out of date; on current fastforwarding is purely an
optimization path--if the packet requires features not supported by the
fast path then it's processed normally.
Sam
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