--- /n/sources/plan9/sys/man/3/ip	Tue Jun 15 19:54:13 2010
+++ /sys/man/3/ip	Thu May 17 00:00:00 2012
@@ -25,6 +25,7 @@
 .B /net/gre
 .B /net/icmp
 .B /net/icmpv6
+.B /net/il
 .B /net/ipmux
 .B /net/rudp
 .B /net/tcp
@@ -461,9 +462,11 @@
 .BR ip ,
 .BR fs ,
 .BR tcp ,
+.BR il ,
 .BR icmp ,
 .BR udp ,
 .BR compress ,
+.BR ilmsg ,
 .BR gre ,
 .BR tcpwin ,
 .BR tcprxmt ,
@@ -515,7 +518,7 @@
 .I ip
 device
 supports IP as well as several protocols that run over it:
-TCP, UDP, RUDP, ICMP, GRE, and ESP.
+TCP, UDP, RUDP, ICMP, IL, GRE, and ESP.
 TCP and UDP provide the standard Internet
 protocols for reliable stream and unreliable datagram
 communication.
@@ -523,10 +526,10 @@
 ICMP is IP's catch-all control protocol used to send
 low level error messages and to implement
 .IR ping (8).
+IL provides a reliable datagram service for communication
+between Plan 9 machines but is now deprecated.
 GRE is a general encapsulation protocol.
 ESP is the encapsulation protocol for IPsec.
-IL provided a reliable datagram service for communication
-between Plan 9 machines over IPv4, but is no longer part of the system.
 .PP
 Each protocol is a subdirectory of the IP stack.
 The top level directory of each protocol contains a
@@ -837,7 +840,7 @@
 to
 .BR ctl .
 .PP
-Unlike TCP, the reboot of one end of a connection does
+Unlike IL or TCP, the reboot of one end of a connection does
 not force a closing of the connection.  Communications will
 resume when the rebooted machine resumes talking.  Any unacknowledged
 packets queued before the reboot will be lost.  A reboot can
@@ -930,6 +933,19 @@
 .I data
 file.
 .
+.SS IL
+IL is a reliable point-to-point datagram protocol.  Like TCP, IL delivers datagrams
+reliably and in order. Also like TCP, a connection is
+determined by the address and port numbers of the two ends.
+Like UDP, each read and write transfers a single datagram.
+.PP
+IL is efficient for LANs but doesn't have the
+congestion control features needed for use through
+the Internet.
+It is no longer necessary, except to communicate with old standalone
+.IR fs (4)
+file servers.
+Its use is now deprecated.
 .SS GRE
 GRE is the encapsulation protocol used by PPTP.
 The kernel implements just enough of the protocol
@@ -1229,6 +1245,23 @@
 datagrams received for bad ports
 malformed datagrams received
 datagrams sent
+.in -0.25i
+.1C
+.EE
+.PP
+Reading
+.B /net/il/stats
+returns a list of 7 tagged and newline-separated fields representing:
+.EX
+.ft 1
+.2C
+.in +0.25i
+checksum errors
+header length errors
+out of order messages
+retransmitted messages
+duplicate messages
+duplicate bytes
 .in -0.25i
 .1C
 .EE
--- /n/sources/plan9/sys/src/cmd/ndb/cs.c	Fri Mar 30 20:41:12 2012
+++ /sys/src/cmd/ndb/cs.c	Thu May 17 00:00:00 2012
@@ -158,13 +158,15 @@
  *  net doesn't apply to (r)udp, icmp(v6), or telco (for speed).
  */
 Network network[] = {
-[Ntcp]	{ "tcp",	iplookup,	iptrans,	0 },
-	{ "udp",	iplookup,	iptrans,	1 },
-	{ "icmp",	iplookup,	iptrans,	1 },
-	{ "icmpv6",	iplookup,	iptrans,	1 },
-	{ "rudp",	iplookup,	iptrans,	1 },
-	{ "ssh",	iplookup,	iptrans,	1 },
-	{ "telco",	telcolookup,	telcotrans,	1 },
+[Ntcp]	{ "tcp",	iplookup,	iptrans,	0, 0 },
+	{ "il",		iplookup,	iptrans,	0, 1 },
+	{ "il",		iplookup,	iptrans,	0, 0 },
+	{ "udp",	iplookup,	iptrans,	1, 0 },
+	{ "icmp",	iplookup,	iptrans,	1, 0 },
+	{ "icmpv6",	iplookup,	iptrans,	1, 0 },
+	{ "rudp",	iplookup,	iptrans,	1, 0 },
+	{ "ssh",	iplookup,	iptrans,	1, 0 },
+	{ "telco",	telcolookup,	telcotrans,	1, 0 },
 	{ 0 },
 };