Date: Thu, 17 Nov 2005 12:08:50 +0300 From: Gleb Smirnoff <glebius@FreeBSD.org> To: Kazuaki Oda <kaakun@highway.ne.jp> Cc: freebsd-net@FreeBSD.org Subject: Re: carp backup host replies to arp-request Message-ID: <20051117090850.GY1647@cell.sick.ru> In-Reply-To: <437C21AF.2070107@highway.ne.jp> References: <437C21AF.2070107@highway.ne.jp>
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Kazuaki-san,
On Thu, Nov 17, 2005 at 03:22:39PM +0900, Kazuaki Oda wrote:
K> I have set up 2 routers with FreeBSD 6.0-RELEASE. They are using carp
K> interfaces, so one is a master router and another is a backup.
K> They seemed to work fine, but a few days later I noticed that not only
K> master router but also backup router replies to arp-requests of the
K> common IP address from a layer 3 switch. This behavior confuses the
K> switch, and sometimes it makes the switch to send a packet addressed
K> to the common IP address to the port which is connected to backup router.
K> I googled and found that OpenBSD fixed this problem in ip_carp.c 1.62.
K> I hope that someone import this into FreeBSD...
Can you please confirm, that the attached patch fixes the problem for you?
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Totus tuus, Glebius.
GLEBIUS-RIPN GLEB-RIPE
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Index: ip_carp.c
===================================================================
RCS file: /home/ncvs/src/sys/netinet/ip_carp.c,v
retrieving revision 1.37
diff -u -r1.37 ip_carp.c
--- ip_carp.c 14 Nov 2005 12:50:23 -0000 1.37
+++ ip_carp.c 17 Nov 2005 09:06:17 -0000
@@ -1162,7 +1162,8 @@
TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
if ((SC2IFP(vh)->if_flags & IFF_UP) &&
(SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
- ia->ia_ifp == SC2IFP(vh)) {
+ ia->ia_ifp == SC2IFP(vh) &&
+ vh->sc_state == MASTER) {
*enaddr = IF_LLADDR(vh->sc_ifp);
CARP_UNLOCK(cif);
return (1);
@@ -1187,7 +1188,8 @@
if (IN6_ARE_ADDR_EQUAL(taddr,
&ifatoia6(ifa)->ia_addr.sin6_addr) &&
(SC2IFP(vh)->if_flags & IFF_UP) &&
- (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) {
+ (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
+ vh->sc_state == MASTER) {
CARP_UNLOCK(cif);
return (ifa);
}
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