two question for r473

1) I've put the BT dl machine into DMZ, however, I still get a lot of following message.
Sep 28 09:30:35 kernel: ip_conntrack: table full, dropping packet.
Sep 28 09:30:35 kernel: ip_conntrack: table full, dropping packet.
Sep 28 09:30:35 kernel: ip_conntrack: table full, dropping packet.
Sep 28 09:30:35 kernel: ip_conntrack: table full, dropping packet.
Sep 28 09:30:35 kernel: ip_conntrack: table full, dropping packet.
Sep 28 09:30:35 kernel: ip_conntrack: table full, dropping packet.
Sep 28 09:30:35 kernel: ip_conntrack: table full, dropping packet.
Sep 28 09:30:35 kernel: ip_conntrack: table full, dropping packet.
Sep 28 09:30:35 kernel: ip_conntrack: table full, dropping packet.
Sep 28 09:30:36 kernel: ip_conntrack: table full, dropping packet.

If that's in DMZ, it should not be via NAT and thus should not have table full problem?

2) I installed samba3, everytime I restarted, I find that there are 2 instances of smbd run, which takes up 20m of memory. Is it due to 2 USB interface of WL500gP and thus need to start the daemon twice?

Reply is highly appreciated!