tcp problema

[Csaba ASZALAI]

sziasztok!

adott egy szerver 4.5-RELEASE-zel, mely idonkent teljesen meghujul :(
ha megprobalok rola (111.111.111.111) egy tetszoleges tcp kapcsolatot
letrehozni egy akarmilyen kulso host (222.222.222.222) valamilyen
portjaval, akkor a kovetkezoket latom tcpdump-pal:

[root at kulso_host/~]> tcpdump -n -i xl0 host 111.111.111.111
tcpdump: listening on xl0
18:24:57.015103 111.111.111.111.2085 > 222.222.222.222.21: S 2016402125:2016402125(0)
win 65535 <mss 1460,nop,wscale 1,nop,nop,timestamp 72827726 0> (DF) [tos 0x10]
18:24:57.015328 222.222.222.222.21 > 111.111.111.111.2085: S 813975413:813975413(0) ack 2016402126
win 17376 <mss 1460,nop,wscale 0,nop,nop,timestamp 106456302 72827726> (DF)
18:24:57.015632 111.111.111.111.2085 > 222.222.222.222.21: R 2016402126:2016402126(0) win 0
18:25:00.013218 111.111.111.111.2085 > 222.222.222.222.21: S 2016402125:2016402125(0)
win 65535 <mss 1460,nop,wscale 1,nop,nop,timestamp 72828026 0> (DF) [tos 0x10]
18:25:03.012931 111.111.111.111.2085 > 222.222.222.222.21: S 2016402125:2016402125(0)
win 65535 <mss 1460,nop,wscale 1,nop,nop,timestamp 72828326 0> (DF) [tos 0x10]
18:25:06.012702 111.111.111.111.2085 > 222.222.222.222.21: S 2016402125:2016402125(0)
win 65535 <mss 1460> (DF) [tos 0x10]
18:25:09.012510 111.111.111.111.2085 > 222.222.222.222.21: S 2016402125:2016402125(0)
win 65535 <mss 1460> (DF) [tos 0x10]
18:25:12.012731 111.111.111.111.2085 > 222.222.222.222.21: S 2016402125:2016402125(0)
win 65535 <mss 1460> (DF) [tos 0x10]
18:25:18.012089 111.111.111.111.2085 > 222.222.222.222.21: S 2016402125:2016402125(0)
win 65535 <mss 1460> (DF) [tos 0x10]
18:25:30.011655 111.111.111.111.2085 > 222.222.222.222.21: S 2016402125:2016402125(0)
win 65535 <mss 1460> (DF) [tos 0x10]
18:25:54.010341 111.111.111.111.2085 > 222.222.222.222.21: S 2016402125:2016402125(0)
win 65535 <mss 1460> (DF) [tos 0x10]
18:26:14.570330 222.222.222.222.21 > 111.111.111.111.2085: R 447405214:447405214(0) ack 1
win 0 (DF)

a kapcsolat vegul timeout-tal elszall.
mitol lehet ez?
ugy tunik, mintha a tcp handshake felig-meddig suketek parbeszede volna... :P
udv:

	csaba