Date: Mon, 13 Nov 2000 10:15:52 -0600 (CST) From: Guy Helmer <ghelmer@cs.iastate.edu> To: Mikel <mikel@upan.org> Cc: net@FreeBSD.ORG Subject: Re: "arp: XX is on xx0 but got reply from YY on yy0" message Message-ID: <Pine.HPX.4.05.10011131002180.28204-100000@popeye.cs.iastate.edu> In-Reply-To: <3A0C1163.82FDA989@upan.org>
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On Fri, 10 Nov 2000, Mikel wrote:
> could you maybe send a copy (or a mock copy) of your rc.conf files?
The relevant lines from rc.conf would look like:
network_interfaces="lo0 dc0 aue0"
ifconfig_dc0="up"
ifconfig_aue0="inet 10.0.0.1 netmask 255.255.255.0"
> Guy Helmer wrote:
>
> > I'm working with a situation where a machine will have two interfaces on
> > the same Ethernet segment. One interface does not have an IP address and
> > is in promiscuous mode to listen to the segment; the other interface has
> > an IP address and is running normally. The kernel logs a lot of "arp: XX
> > is on xx0 but got reply from YY on yy0" messages.
> >
> > Questions also appear on the FreeBSD lists asking about this message when
> > people have multiple interfaces in different IP subnets on the same wire.
> >
> > >From reading the source in for in_arpinput() in
> > /sys/netinet/if_ether.c, it appears that the kernel just logs this message
> > and harmlessly tosses the packet. If this *is* harmless, would it be OK
> > to make the log message conditional on a sysctl toggle?
> >
> > Guy
I'm proposing a sysctl, such as net.link.ether.inet.disablearpwarning,
that would turn off the arp warning messages if the variable were set to a
non-zero value. Untested patch:
Index: if_ether.c
===================================================================
RCS file: /home/ncvs/src/sys/netinet/if_ether.c,v
retrieving revision 1.72
diff -u -r1.72 if_ether.c
--- if_ether.c 2000/07/13 19:31:01 1.72
+++ if_ether.c 2000/11/13 16:11:51
@@ -102,6 +102,7 @@
static int arp_maxtries = 5;
static int useloopback = 1; /* use loopback interface for local traffic */
static int arp_proxyall = 0;
+static int disable_arp_warning = 0;
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, maxtries, CTLFLAG_RW,
&arp_maxtries, 0, "");
@@ -109,6 +110,8 @@
&useloopback, 0, "");
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, proxyall, CTLFLAG_RW,
&arp_proxyall, 0, "");
+SYSCTL_INT(_net_link_ether_inet, OID_AUTO, disablearpwarning, CTLFLAG_RW,
+ &disable_arp_warning, 0, "");
static void arp_rtrequest __P((int, struct rtentry *, struct sockaddr *));
static void arprequest __P((struct arpcom *,
@@ -557,11 +560,12 @@
if (la && (rt = la->la_rt) && (sdl = SDL(rt->rt_gateway))) {
#ifndef BRIDGE /* the following is not an error when doing bridging */
if (rt->rt_ifp != &ac->ac_if) {
- log(LOG_ERR, "arp: %s is on %s%d but got reply from %6D on %s%d\n",
- inet_ntoa(isaddr),
- rt->rt_ifp->if_name, rt->rt_ifp->if_unit,
- ea->arp_sha, ":",
- ac->ac_if.if_name, ac->ac_if.if_unit);
+ if (!disable_arp_warning)
+ log(LOG_ERR, "arp: %s is on %s%d but got reply from %6D on %s%d\n",
+ inet_ntoa(isaddr),
+ rt->rt_ifp->if_name, rt->rt_ifp->if_unit,
+ ea->arp_sha, ":",
+ ac->ac_if.if_name, ac->ac_if.if_unit);
goto reply;
}
#endif
Guy Helmer, Ph.D. Candidate, Iowa State University Dept. of Computer Science
Research Assistant, Dept. of Computer Science --- ghelmer@cs.iastate.edu
http://www.cs.iastate.edu/~ghelmer
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