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Old 04-01-2010, 05:50 AM   #1
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Registered: Jul 2009
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Angry Iptales --limit-burst problems

hello everybody

Actually i'm doing an ingenior training in SAGEM company, well i'm trying to develop an application which is able ti disturb the IP Network,my idea was is to mount 2 Network Interface Card (NIC) and make a bridge to pass the IP flow and to exploit the firewall Netfilter using iptables command.The application has to import a text file containing a binary array like this one:

0 1 0 : 0 corresponds to iptables -p ip ACCEPT
1 1 1 : 1 corresponds to iptables -p ip DROP
0 0 1

==> So the expected result is to have 5 ip datagrams dropped

My idea was: if 0 --> iptables -A FORWARD -p ip -m limit --limit-burst 1 -j ACCEPT
if 1 --> iptables -A FORWARD -p ip -m limit --limit-burst 1 -j DROP

The problem was: After executing the application and parsing the text file,
with iptables -L -v: i have

-A FORWARD -p ip -m limit --limit-burst 1 -j ACCEPT
-A FORWARD -p ip -m limit --limit-burst 1 -j DROP
-A FORWARD -p ip -m limit --limit-burst 1 -j ACCEPT

which is logic, but when i sniff with wireshark i find more packets are dropped(6,7 or 8 are dropped), like i had put more DROP rules.
and sometimes i found the exact value(usually 5 dropped).

so i didn't arrive to an explication for this problem.

please help body.
Old 04-01-2010, 01:23 PM   #2
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Registered: Jul 2009
Posts: 24

Original Poster
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please answer me if there is a solution )))


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