Всем привет.

# iptables -I INPUT 1 -p tcp --syn --dport 21 -m connlimit --connlimit-above 
3 --connlimit-mask 32 -j REJECT
iptables: Unknown error 18446744073709551615

iptables-1.3.5-alt3

Linux exchange.cpms.ru 2.6.14-std26-smp-alt5 #1 SMP Fri Feb 10 19:26:24 MSK 
2006 x86_64 GNU/Linux

ipt_limit               3968  0
ipt_REJECT              7296  26
iptable_filter          4736  1
ip_tables              23552  3 ipt_limit,ipt_REJECT,iptable_filter

-- 
Pavlov Konstantin,
ALT Linux Team,
jid: thresh@altlinux.org