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Thread: How can I prevent my server from crashing in a DOS attack??

  1. #11
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    Right, but the connections are all coming (as far as postfix is concerned) from 192.168.1.1, which will certainly be considered local by postfix - so, either you firewall is rewriting the packets when it NATs them, or someone's spamming you from your firewall...

  2. #12
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    Ok, that might be the problem, is there any reason why the server ignores the ip address it came from in the first place though, like the one below?


    Mar 14 09:48:30 mi6 amavis[30286]: (30286-01-3) Blocked SPAM, LOCAL [192.168.1.1] [24.67.144.148] <ab721718@ms1.hinet.net> -> <chialia@giga.net.tw>,<akandakimo@yahoo.com.tw>,<b ubble1987kimo@yahoo.com.tw>, Message-ID: <JOYOFAOROKBDWVEHMWIASA@yahoo.com>, mail_id: QREQSMVgs75y, Hits: 52.308, 28364 ms
    Mar 14 09:48:32 mi6 amavis[30286]: (30286-01-3) extra modules loaded: Net/LDAP/Bind.pm
    Mar 14 09:48:33 mi6 amavis[30284]: (30284-02) ESMTP::10024 /opt/zimbra/amavisd/tmp/amavis-20060314T094640-30284: <poxxstnzikb@ms33.hinet.net> -> <ruan@xuite.net>,<e4n0@yahoo.com.tw>,<fr755@yahoo. com.tw>,<gkira@yahoo.com.tw>,<mama3486g@yahoo.com. tw> Received: SIZE=1488 from mi6.extier.com ([127.0.0.1]) by localhost (mi6.extier.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 30284-02; Tue, 14 Mar 2006 09:48:33 -0500 (EST)

  3. #13
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    I don't understand the question - the server doesn't ignore anything - I'm convinced this is a firewall problem.

    What kind of FW is this, anyway?

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