table full, dropping packets when forwarding

table full, dropping packets when forwarding

[Elison Niven]

Hi List,

I am running a custom powerpc board with linux kernel 2.6.22.
It was two interfaces eth0 - 192.168.1.148 and eth1 - 192.168.2.23

I have enabled forwarding on my board by writing 1 to
/proc/sys/net/ipv4/ip_forward and setup masquerading rules on both the
interfaces means packets leaving eth0 will have source ip =
192.168.1.148 and packets leaving eth1 will have source ip =
192.168.2.23.

Now in my network I have two machines A - 192.168.1.7 and another
Machine B - 192.168.2.13.

All of the above machines are in the same physical LAN. (means the
ethernet cables are connected to the same switch)

Now on machine A, I setup routing as
"route add -net 192.168.2.0 netmask 255.255.255.0 gw 192.168.1.148"
and ping 192.168.2.13 from Machine A. When i do a flood ping with ping
-f 192.168.2.13, I get "nf_conntrack:table full, dropping packet" on
my board.

Taking a look at /proc/net/stat/nf_conntrack it shows the entries as
0x8000 i.e. 32768 which is the default max specified.

How do I solve/achieve this function?

Once the entries reach 0x8000, they never start to decrease! Am i
missing something ?

Elison