Date: Thu, 30 Jul 1998 01:47:05 -0700 (PDT) From: "Jan B. Koum " <jkb@best.com> To: Andrew Stone <andrew@stone.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: sysctl -w net.inet.udp.log_in_vain=1 causes spurious messages Message-ID: <Pine.BSF.3.96.980730014315.17374A-100000@shell6.ba.best.com> In-Reply-To: <199807292015.OAA00513@floyd.stone.com>
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Hello, I guess this is something I will have to add to security docs (how to undo things). To turn off log_in_vain simply do # sysctl -w net.inet.tcp.log_in_vain=0 # sysctl -w net.inet.tcp.log_in_vain=0 (1 turns things on, 0 turns things off). I guess I should also add to the How-To that this is sysctl change will generate a lot of noice. -- Yan Jan Koum jkb@best.com | "Turn up the lights; I don't want www.FreeBSD.org -- The Power to Serve | to go home in the dark." "Write longer sentences - they are paying us a lot of money" On Wed, 29 Jul 1998, Andrew Stone wrote: >(I'm not on this mailing list, so please reply to me, and I'll summarize, thanks!) > >While beefing up the security of our freeBSD gateway, I call these sysctl's from rc.local: > >sysctl -w net.inet.tcp.log_in_vain=1 >sysctl -w net.inet.udp.log_in_vain=1 >sysctl -w kern.securelevel=2 > > >The kernel logs messages like the following, which, since it's from the gateway to the gateway, make no sense and just add noise: >(note 53 is the DNS port, which we allow with ipfw, but these are being logged by the kernel, the IP address is the local gateway IP address) > >Connection attempt to UDP 198.111.108.100:1027 from 198.111.108.100:53 >Connection attempt to UDP 198.111.108.100:1029 from 198.111.108.100:53 >Connection attempt to UDP 198.111.108.100:1031 from 198.111.108.100:53 >Connection attempt to UDP 198.111.108.100:1114 from 198.111.108.100:53 > >Anyway to stop these? I looked online but found nothing. > >Thanks! > >Andrew Stone (andrew@stone.com) > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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