Curious about log entries.

[Steven W. Orr]

Oct 24 14:28:24 saturn kernel: [FIAIF_INVALID]:IN=eth0 OUT= \
MAC=00:13:d4:d1:b7:7 \
c:00:12:44:91:f0:8c:08:00 SRC=70.88.208.113 DST=207.172.210.41 LEN=43 \
TOS=0x08 PREC=0x00 TTL=17 ID=0 PROTO=TCP SPT=25 DPT=56077 \
WINDOW=0 RES=0x00 ACK RST URGP=0

I see entries like the above on a regular basis and I just don't get it. 
I'm the 210.41 (if that wasn't obvious) and the other guy is talking to me 
from his port 25. So what about this syslog entry would make the packet 
invalid? Am I right to assume that this has to represent an already 
established conversation?

TIA

-- 
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