Date: Sat, 20 Mar 1999 17:53:52 +0200 (EET) From: Ruslan Ermilov <ru@ucb.crimea.ua> To: FreeBSD-gnats-submit@freebsd.org Subject: docs/10692: Fast IP forwarding is not documented Message-ID: <199903201553.RAA65903@relay.ucb.crimea.ua>
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>Number: 10692
>Category: docs
>Synopsis: Fast IP forwarding is not documented
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-doc
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Sat Mar 20 08:00:01 PST 1999
>Closed-Date:
>Last-Modified:
>Originator: Ruslan Ermilov
>Release: FreeBSD 3.1-STABLE i386
>Organization:
United Commercial Bank
>Environment:
Both RELENG_3 and HEAD
>Description:
Fast IP forwarding code is not documented in any way.
>How-To-Repeat:
dg 1998/05/19 07:04:40 PDT
Modified files:
sys/conf files
sys/net if_ethersubr.c if_fddisubr.c if_ppp.c
sys/netinet in.h in_var.h ip_fw.c ip_input.c ip_var.h
Added files:
sys/netinet ip_flow.c
Log:
Added fast IP forwarding code by Matt Thomas <matt@3am-software.com> via
NetBSD, ported to FreeBSD by Pierre Beyssac <pb@fasterix.freenix.org> and
minorly tweaked by me.
This is a standard part of FreeBSD, but must be enabled with:
"sysctl -w net.inet.ip.fastforwarding=1" ...and of course forwarding must
also be enabled. This should probably be modified to use the zone
allocator for speed and space efficiency. The current algorithm also
appears to lose if the number of active paths exceeds IPFLOW_MAX (256),
in which case it wastes lots of time trying to figure out which cache
entry to drop.
>Fix:
Index: inet.4
===================================================================
RCS file: /usr/FreeBSD-CVS/src/share/man/man4/inet.4,v
retrieving revision 1.8
diff -u -r1.8 inet.4
--- inet.4 1997/02/22 13:24:32 1.8
+++ inet.4 1999/03/19 16:05:52
@@ -209,13 +209,22 @@
MIB. In addition to the variables supported by the transport
protocols (for which see the respective manual pages), the following
general variables are defined:
-.Bl -tag -width IPCTL_SENDREDIRECTS
+.Bl -tag -width IPCTL_FASTFORWARDING
.It Dv IPCTL_FORWARDING
.Pq ip.forwarding
-Boolean: enable/disable forwarding of IP packets (default depends on
-the
-.Dv GATEWAY
-kernel configuration option).
+Boolean: enable/disable forwarding of IP packets.
+Defaults to off.
+.It Dv IPCTL_FASTFORWARDING
+.Pq ip.fastforwarding
+Boolean: enable/disable the use of fast IP forwarding code.
+Defaults to off.
+When fast forwarding is enabled, IP packets are forwarded directly to
+the appropriate network interface 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
+.Xr ipfirewall 4
+checking.
+It is not guaranteed that every packet will be fast-forwarded.
.It Dv IPCTL_SENDREDIRECTS
.Pq ip.redirect
Boolean: enable/disable sending of ICMP redirects in response to
@@ -256,6 +265,7 @@
.Xr igmp 4 ,
.Xr intro 4 ,
.Xr ip 4 ,
+.Xr ipfirewall 4 ,
.Xr tcp 4 ,
.Xr ttcp 4 ,
.Xr udp 4
>Release-Note:
>Audit-Trail:
>Unformatted:
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