Meaning of number inside iptable rules' brackets? [duplicate]

Question

Possible Duplicate:
Don’t understand [0:0] iptable syntax

E.g. The command iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080, lead to the configs

*nat
:PREROUTING ACCEPT [0:0]
:POSTROUTING ACCEPT [1:132]
:OUTPUT ACCEPT [1:132]
-A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080 
COMMIT

Can anyone explain the line from

:PREROUTING ACCEPT [0:0]

to

:OUTPUT ACCEPT [1:132]

Especially what is the meaning of number inside iptable rules' brackets?

Answer 1

They are counters.. overall counters in fact.

Try this:

iptables -L INPUT

iptables -nvxL INPUT

iptables -nvxL

iptables -t nat -nvxL

iptables --line-numbers -nvxL

And

iptables -A OUTPUT -p tcp -m tcp --dport 80

but without jump action, there is only a counter:

iptables --line-numbers -nvxL OUTPUT