I have tried using iptraf for my NAT firewall to analyse the IP traffic.
Basically I am faced with this difficulty of related the source IP
to the outgoing interface to the internet, so I am wondering if
anyone has a suggestion for a different ways to do it, or a suggestion
for a better tool.
Details :-
Supposed : eth0 - LAN
eth1 - WAN1
eth2 - WAN2
And then all source IPs in the LAN are SNAT to the respective
WAN interface when leave for internet. There are also DNAT
traffic from internet to the LAN.
I want to breakdown the statistic of LAN users using the
internet. If I run iptraf on eth0, I will see the LAN stats, but I
don't know for sure which one really go out to which WAN
( some traffic does not even go out to the WAN at all ! ).
Then when I sniff at eth1 or eth2, I lost the information about the LAN IPs.
How could I do a stateful or NAT-aware traffic analysis ? Anyone has
a good suggestion ?
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