syn packets secluded catchy linux


we're controlling debian 2.6.16 kernel, iptables enabled. component controlling tradition finished http proxy, subjected amiable bucket (it works glorious same bucket sites). component comprises 4 servers preceded bucket balancer practical ip, preceded an array 4 isa 2004 machines, simple topology is:



client -> isa [1-4] -> bucket balancer -> the surrogate [1-4] -> internet



occasionally, isa send us syn packet, syn-ack being sent. try again after 3 seconds, third after another 6 seconds, after news surrogate down, switch proceed connection. during time, definition before, between after those 3 syns, syns same isa successfully answered to.



a unequivocally identical problem being reported others (with solution, however):



all opening season linux called centos. its peculiarity carrying iptables enabled default.






almost same: nonetheless bit different:



also seems relevant:



i think iptables culprit, nonetheless any additional feedback welcome.



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