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Date:      Wed, 29 Jul 98 14:17:00 -0600
From:      Andrew Stone <andrew@stone.com>
To:        freebsd-questions@FreeBSD.ORG
Subject:   sysctl -w net.inet.udp.log_in_vain=1 causes spurious messages
Message-ID:  <199807292015.OAA00513@floyd.stone.com>

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(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=3D1
sysctl -w net.inet.udp.log_in_vain=3D1
sysctl -w kern.securelevel=3D2


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)


--Apple-Mail-659827788-13
content-type: text/enriched; charset=us-ascii
content-transfer-encoding: quoted-printable

(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=3D1

sysctl -w net.inet.udp.log_in_vain=3D1

sysctl -w kern.securelevel=3D2



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)


<fixed><smaller>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</smaller></fixed>


Anyway to stop these? I looked online but found nothing.


Thanks!


Andrew Stone (andrew@stone.com)



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