From 18ea14531f8f3ebbed2bebd7105b117847189e9f Mon Sep 17 00:00:00 2001
From: joerg <joerg@FreeBSD.org>
Date: Sun, 30 Dec 2001 20:43:09 +0000
Subject: Implement the option to disable IPv6 on an sppp interface
 (counterpart to the kernel code just committed).

MFC after:	1 month
---
 sbin/spppcontrol/spppcontrol.8 | 14 +++++++++++++-
 sbin/spppcontrol/spppcontrol.c |  5 +++++
 2 files changed, 18 insertions(+), 1 deletion(-)

(limited to 'sbin/spppcontrol')

diff --git a/sbin/spppcontrol/spppcontrol.8 b/sbin/spppcontrol/spppcontrol.8
index ca227c9..60c08a0 100644
--- a/sbin/spppcontrol/spppcontrol.8
+++ b/sbin/spppcontrol/spppcontrol.8
@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd December 27, 2001
+.Dd December 30, 2001
 .Os
 .Dt SPPPCONTROL 8
 .Sh NAME
@@ -172,6 +172,17 @@ defaulting to 3000 ms.
 Enable negotiation of Van Jacobsen header compression.  (Enabled by default.)
 .It Ar disable-vj
 Disable negotiation of Van Jacobsen header compression.
+.It Ar enable-ipv6
+Enable negotiation of the IPv6 network control protocol.  (Enabled by
+default if the kernel has IPv6 enabled.)
+.It Ar disable-ipv6
+Disable negotiation of the IPv6 network control protocol.  Since every
+IPv4 interface in an IPv6-enabled kernel automatically gets an IPv6
+address assigned, this option provides for a way to administratively
+prevent the link from attempting to negotiate IPv6.  Note that
+initialization of an IPv6 interface causes a multicast packet to be
+sent, which can cause unwanted traffic costs (for dial-on-demand
+interfaces).
 .El
 .Sh EXAMPLES
 .Bd -literal
@@ -181,6 +192,7 @@ bppp0:	phase=dead
 	hisauthproto=chap hisauthname="ifb-gw" norechallenge
 	lcp-timeout=3000
 	enable-vj
+	enable-ipv6
 .Ed
 .Pp
 Display the settings for bppp0.  The interface is currently in
diff --git a/sbin/spppcontrol/spppcontrol.c b/sbin/spppcontrol/spppcontrol.c
index 2d20570..26ec6a2 100644
--- a/sbin/spppcontrol/spppcontrol.c
+++ b/sbin/spppcontrol/spppcontrol.c
@@ -177,6 +177,10 @@ main(int argc, char **argv)
 			spr.defs.enable_vj = 1;
 		else if (strcmp(argv[0], "disable-vj") == 0)
 			spr.defs.enable_vj = 0;
+		else if (strcmp(argv[0], "enable-ipv6") == 0)
+			spr.defs.enable_ipv6 = 1;
+		else if (strcmp(argv[0], "disable-ipv6") == 0)
+			spr.defs.enable_ipv6 = 0;
 		else
 			errx(EX_DATAERR, "bad parameter: \"%s\"", argv[0]);
 
@@ -221,6 +225,7 @@ print_vals(const char *ifname, struct spppreq *sp)
 	}
 	printf("\tlcp-timeout=%d ms\n", sp->defs.lcp.timeout);
 	printf("\t%sable-vj\n", sp->defs.enable_vj? "en": "dis");
+	printf("\t%sable-ipv6\n", sp->defs.enable_ipv6? "en": "dis");
 }
 
 const char *
-- 
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