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From: duanbing@xxxxxxxxxx
To: "bind-users@xxxxxxx" <bind-users@xxxxxxx>
Subject: about TCP query sessions
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Date: Tue, 27 May 2003 13:48:49 +0800
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  HI bind-users:

        Today, My Bind is dead because too much TCP connections. Following is 
log messages:

        May 27 07:52:57 ns-cache named[179]: client 218.244.34.36#65421: no 
more TCP clients: quota reached
        May 27 07:52:57 ns-cache named[179]: client 218.244.34.36#65422: no 
more TCP clients: quota reached
        May 27 07:52:57 ns-cache named[179]: client 218.244.34.36#65427: no 
more TCP clients: quota reached
        May 27 07:52:57 ns-cache named[179]: client 218.244.34.36#65428: no 
more TCP clients: quota reached
        May 27 07:52:58 ns-cache named[179]: client 218.244.34.36#65431: no 
more TCP clients: quota reached
        May 27 07:52:58 ns-cache named[179]: client 218.244.34.36#65434: no 
more TCP clients: quota reached
        May 27 07:52:58 ns-cache named[179]: client 218.244.34.36#65436: no 
more TCP clients: quota reached
        May 27 07:52:58 ns-cache named[179]: client 218.244.34.36#65437: no 
more TCP clients: quota reached
        May 27 07:52:58 ns-cache named[179]: client 218.244.34.36#65438: no 
more TCP clients: quota reached
        May 27 07:52:58 ns-cache named[179]: client 218.244.34.36#65443: no 
more TCP clients: quota reached
        May 27 07:52:58 ns-cache named[179]: client 218.244.34.36#65444: no 
more TCP clients: quota reached
        May 27 07:52:58 ns-cache named[179]: quota.c:68: INSIST(p != ((void 
*)0) && *p == ((void *)0)) faile
        d
        May 27 07:52:58 ns-cache named[179]: exiting (due to assertion failure)

        218.244.34.36 is a proxy server and a Exchange server behind it make 
these TCP connections.

        I wonder: why TCP connections is so deadly? Every time when there were 
more than 20 - 30 TCP connections, my server became slowly( it is a SUN 220R 
with 1024G memory )

        Can I  block all TCP/53 connections on my firewall? Does this will 
affect ExchangeServer client?

        I know name server uses TCP to transfer packets which are larger than 
512 Byte -- But under which condition the packet will larger than 512 Byte?


        Thanks!




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