max number of the ip_conntrack_max?

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Hello,all.

I have operated iptables firewall which RAM size is 1Giga.
and set the number of the "ip_conntrack_max" to about 40,000. but after some time I can see lots of "ip_conntrack: table full, dropping packet." message.
So I reset the the number to about 70,000 and the problem was solved.


1. So I would like to know the max number of the "ip_conntrack_max" at 1Giga RAM?
2. When I set this number so high, then the system affects or not?
(I have heard that about 350 byte per one connection tracking, right?)


Thanks in advance for your kind answer.




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