Server down every few days

HI there,

I have a dual xeon2.8/2G ram box host with a large forum (for 400+ online at busy time),
my server down every few days, my DC told me:
Dear Customer,
When I plugged a console into your server.....this kept showing up:

IP_Conntrack : tablefull, dropping packet

Maybe the max # of connections is set in?? You can increase it with:

# echo "some_number" > /proc/sys/net/ipv4/ip_conntrack_max

Which might resolve your problem, but I'm not sure so please look into it
What number should I put in it?
Anyone have better suggestions?

PS.I have apf installed on my box

 

 

 

 

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