On 2013/01/31 16:45, Eggert, Lars wrote:
Hi,
I have a small system running FreeBSD 8.2 that does NAT using ipfw and
natd to systems attached to two interfaces: em0 and wlan0. I have a
dhcpd daemon issuing leases on those interfaces. The system has an em1
interface plugged into a cable modem where it obtains a DHCP lease from
an ISP.
For some reason, when traffic from the Internet terminates on the system
itself (I scp a file from the computer) the natd and dhcpd processes
consume significant CPU, and the throughput is less than I expect.
Traffic that passes through to a computer behind the NAT flows without
causing the natd or dhcpd processes to measurably consume CPU.
I see exactly the same issue on -STABLE. Have you been able to figure out the
cause?
Use ipfw nat instead. It uses the libalias(3) in kernel and avoids
gigantic natd(8) overhead.
Thanks,
Lars
Kevin
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