From: Slava Dubrovskiy <slava@psv.com.ua>
To: Community@altlinux.ru
Subject: [Comm] Битые пакеты?
Date: Thu, 23 Oct 2003 17:43:28 +0300
Message-ID: <3F97E910.7020009@psv.com.ua> (raw)
Hello Community!
Стоит вот такой фильтр
......
$IPTABLES -N
bad_tcp_packets
$IPTABLES -A bad_tcp_packets -p tcp ! --syn -m state --state NEW -j LOG
--log-prefix "New not syn:"
$IPTABLES -A bad_tcp_packets -p tcp ! --syn -m state --state NEW -j DROP
......
$IPTABLES -A INPUT -p tcp -j bad_tcp_packets
......
И периодически получаю в лог вот такие записи:
Oct 23 17:22:44 server kernel: New not syn:IN= OUT=lo SRC=192.168.1.1
DST=192.168.1.1 LEN=51 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=TCP
SPT=36977 DPT=143 WINDOW=49188 RES=0x00 ACK PSH FIN URGP=0
Oct 23 17:23:10 server last message repeated 5 times
Oct 23 17:24:30 server last message repeated 2 times
Что это такое? Кто может посылать с интерфейса lo пакеты NEW без бита
--syn? Или я не правильно настроил фильтрацию?
Слава Д.
next reply other threads:[~2003-10-23 14:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-23 14:43 Slava Dubrovskiy [this message]
2003-10-26 13:28 ` Borovoy M.
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