Date: Sat, 26 Nov 2011 00:24:09 -0500 From: Alexander Wittig <alexander@wittig.name> To: Gleb Smirnoff <glebius@FreeBSD.org> Cc: freebsd-net@FreeBSD.org Subject: Re: FreeBSD 9 and ARP multicast source address error messages Message-ID: <B2E2DE08-6866-422C-ACFF-AB3229E49318@wittig.name> In-Reply-To: <20111121120123.GC81136@FreeBSD.org> References: <96A5211A-398B-4773-8C6A-2D772D241CF0@msu.edu> <20111110065135.GS71907@FreeBSD.org> <6A964045-2ADF-42EC-8AC4-00179FDBE4D9@msu.edu> <20111121120123.GC81136@FreeBSD.org>
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Gleb, > A> I'm not an expert on networking, but is this condition of ignoring = such an ARP packet really a noteworthy event? I.e. is this something = that should not occur in "normal" operation according to the ARP = specifications? If this is mostly for kernel developers, maybe it should = only be enabled in debug kernel builds? >=20 > Nope, this isn't for kernel developers only but for sysadmins. Some = bad traffic is present in your > network, and it should be noticed by sysadmin, that's why LOG_NOTICE = severity left. >=20 > However, I understand how annoying it is when you are in a bad = network, you don't admin it, you > can't fix it and your logging system is too chatty. I am thinking of = some generic way of supperssing > or ratelimiting all logged events that can be triggered by host on LAN = or even by remote host. That would be great. As you say, I don't administer the network or these = Windows cluster machines, so I can't make the offending ARP packages go = away. For me, filtering them out via ipfw (as described in my first = email) works just fine for now. An easier solution than some sort of = rate limiting may be a simple sysctl knob to disable the messages = manually at runtime? Something akin to the already existing = net.link.ether.inet.log_arp_permanent_modify, = net.link.ether.inet.log_arp_movements, = net.link.ether.inet.log_arp_wrong_iface, maybe. Alexander=
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