Date: Thu, 25 Jun 2009 09:13:30 GMT From: Arnt Gulbrandsen <arnt@gulbrandsen.priv.no> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/136023: "ARP: ... moved" log line incomplete Message-ID: <200906250913.n5P9DUsX064729@www.freebsd.org> Resent-Message-ID: <200906250920.n5P9K1d6081244@freefall.freebsd.org>
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>Number: 136023 >Category: kern >Synopsis: "ARP: ... moved" log line incomplete >Confidential: no >Severity: non-critical >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: doc-bug >Submitter-Id: current-users >Arrival-Date: Thu Jun 25 09:20:01 UTC 2009 >Closed-Date: >Last-Modified: >Originator: Arnt Gulbrandsen >Release: 7.1 >Organization: >Environment: FreeBSD kalyani.oryx.com 7.1-RELEASE FreeBSD 7.1-RELEASE #0: Thu Jan 1 08:58:24 UTC 2009 root@driscoll.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64 >Description: When an ARP table entry changes, the kernel logs a line like this (IP addresses and blah kept unchanged): arp: 195.30.37.40 moved from 00:00:24:c0:0e:29 to 00:16:6f:bb:37:8d on nfe0 The log line is based on a packet like this (as reported by tcpdump): 10:50:29.888674 00:16:6f:bb:37:8d > 00:19:66:2a:83:bc, ethertype ARP (0x0806), length 60: arp reply 195.30.37.40 is-at 00:16:6f:bb:37:8d However, the log line does not log one important piece of information: Who sent the ARP reply (00:16:6f:bb:37:8d in this case). IMO it should be something like arp: 195.30.37.40 moved from 00:00:24:c0:0e:29 to 00:16:6f:bb:37:8d on nfe0 based on ARP reply from 00:16:6f:bb:37:8d. >How-To-Repeat: Needs three hosts, all on the same ethernet. On A, set up proxy arp for B, pointing to a nonexistent ARP device. On C, ping B. C will log "ARP: ... moved..." and may or may not be able to send ping replies to B. The log line will not indicate that A is the source of the problem. >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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