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Old 03-11-2011, 05:12 PM   #1
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Registered: Jan 2006
Location: Belmopan, Belize, Central America
Distribution: Centos, FreeBSD
Posts: 23

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mail kernel: messages

My /var/log/messages file is being flooded by messages like these.

Mar 11 16:38:55 mail kernel: Outbound IN=eth1 OUT=eth0 SRC= DST= LEN=56 TOS=0x00 PREC=0x00 TTL=127 ID=12577 PROTO=UDP SPT=55374 DPT=53 LEN=36
Mar 11 16:38:55 mail kernel: Inbound IN=eth1 OUT= MAC=ff:ff:ff:ff:ff:ff:00:1e:0b:6f:89:dc:08:00 SRC= DST= LEN=199 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=631 DPT=631 LEN=179
Any idea what could be causing this? is the address of my primary DNS server.
Old 03-11-2011, 08:09 PM   #2
Registered: Apr 2005
Location: NYC
Distribution: Debian, RHEL
Posts: 268

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Are you doing any routing/forwarding or the like with iptables? If so it could be considered normal logging of traffic passing through especially if the source and destinations are known and valid.
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