Revert 295285 which was an MFC of the tryforward work (r290383,295282,295283)

In the IPFW+NAT+divergent MTU case there is a bug in sening ICMP MTU updates.

Approved by:	re (marius, gjb)
Sponsored by:	Rubicon Communications (Netgate)

1 files changed, 24 insertions, 2 deletions

diff --git a/share/man/man4/inet.4 b/share/man/man4/inet.4
index 6fe4e61..09cb0bc 100644
--- a/share/man/man4/inet.4
+++ b/share/man/man4/inet.4
@@ -32,7 +32,7 @@
 .\"     From: @(#)inet.4	8.1 (Berkeley) 6/5/93
 .\" $FreeBSD$
 .\"
-.Dd Feb 4, 2016
+.Dd January 26, 2012
 .Dt INET 4
 .Os
 .Sh NAME
@@ -169,11 +169,33 @@ MIB.
 In addition to the variables supported by the transport protocols
 (for which the respective manual pages may be consulted),
 the following general variables are defined:
-.Bl -tag -width IPCTL_ACCEPTSOURCEROUTE
+.Bl -tag -width IPCTL_FASTFORWARDING
 .It Dv IPCTL_FORWARDING
 .Pq ip.forwarding
 Boolean: enable/disable forwarding of IP packets.
 Defaults to off.
+.It Dv IPCTL_FASTFORWARDING
+.Pq ip.fastforwarding
+Boolean: enable/disable the use of
+.Tn fast IP forwarding
+code.
+Defaults to off.
+When
+.Tn fast IP forwarding
+is enabled, IP packets are forwarded directly to the appropriate network
+interface with direct processing to completion, which greatly improves
+the throughput.
+All packets for local IP addresses, non-unicast, or with IP options are
+handled by the normal IP input processing path.
+All features of the normal (slow) IP forwarding path are supported
+including firewall (through
+.Xr pfil 9
+hooks) checking, except
+.Xr ipsec 4
+tunnel brokering.
+The
+.Tn IP fastforwarding
+path does not generate ICMP redirect or source quench messages.
 .It Dv IPCTL_SENDREDIRECTS
 .Pq ip.redirect
 Boolean: enable/disable sending of ICMP redirects in response to