Date: Tue, 18 Sep 2001 19:57:43 +1200 From: "Matthew Luckie" <kluckie@ihug.co.nz> To: <net@freebsd.org> Subject: arp X moved from Y to Z messages Message-ID: <001501c14017$9c2e73c0$0a00a8c0@neoprene>
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Hi there
At work there are several freebsd machines that route packets through a
"load balanced" or "redundant" router configuration.
The gateway's IP address actually refers to two different machines.
Naturally the gateway is used quite a bit, and the syslog fills up with "arp
X moved from Y to Z on fxp0" messages.
I'm guessing that not many people would have this problem.
Below is a patch that I have found useful for these machines.
I'm aware that there are security considerations with this patch; by default
the sysctl is not activated.
I'm not subscribed to the list, CC me on any responses please.
Matthew
--- if_ether.c.orig Tue Sep 18 13:56:16 2001
+++ if_ether.c Tue Sep 18 14:27:46 2001
@@ -502,6 +502,12 @@
&log_arp_wrong_iface, 0,
"log arp packets arriving on the wrong interface");
+static int log_arp_moved = 1;
+
+SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_moved, CTLFLAG_RW,
+ &log_arp_moved, 0,
+ "log arp moved");
+
static void
in_arpinput(m)
struct mbuf *m;
@@ -586,12 +592,13 @@
}
if (sdl->sdl_alen &&
bcmp((caddr_t)ea->arp_sha, LLADDR(sdl), sdl->sdl_alen))
{
- if (rt->rt_expire)
+ if (rt->rt_expire) {
+ if(log_arp_moved)
log(LOG_INFO, "arp: %s moved from %6D to %6D on
%s%d\n",
inet_ntoa(isaddr), (u_char *)LLADDR(sdl),
":",
ea->arp_sha, ":",
ac->ac_if.if_name, ac->ac_if.if_unit);
- else {
+ } else {
log(LOG_ERR,
"arp: %6D attempts to modify permanent entry
for %s on %s%d\n",
ea->arp_sha, ":", inet_ntoa(isaddr),
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