Kernel log output meaning

[Illia Baidakov]

Hello security,

This output I've received from conventional cron daily job:
[...]
gw.nbh.ru kernel log messages:
> Limiting closed port RST response from 201 to 200 packets per second
[...]
where fxp0 is an external interface.

What could involve such a messages?

In /var/log/messages the above strings was prepended by string:
Feb 10 13:24:29 gw /kernel: ipfw: limit 100 reached on entry 10800
current ipfw #10800 entry says:
10800 1204 52976 deny log logamount 100 ip from any to 172.16.0.0/12 via fxp0

/var/log/security  at this time shows many strings looking like this:
Feb 10 13:24:29 gw /kernel: ipfw: 10800 Deny TCP 11.22.33.44:1376 172.29.249.249:7 out via fxp0

11.22.33.44 is my fxp0 iface address.
I do not think I have tried to initiate such a connections purposely.
Possibly by playing whith spamassassin?..
Remember, I had failed attempt to download its source from its website
somewhere at that time. (The second downloading attempt has
successed.)

-- 
Thanks in advance,
Illia Baidakov.