      .  Mangle 
     TOS (Type of Service   ), TTL
(Time To Live   )  MARK.    , -
  conntrack,  ,   , 
  .

         iptables  
        :

t /shin/service iptables panic



1.       iptables?

2.      iptables?

3.    iptables   
 Linux?

4.   iptables,     
TELNET.

5.   NAT?    NAT?

 

6.    conntrack?

7.     ?    ?

8.     ?    ?

9.           ?  
?

10.  ,     SMTP- 
 spmr. corn.

776  V.     