How to fix in_cksum_skip console errors?

Question

linux

Gives messages to the console
kernel: in_cksum_skip: out of data by
Tell me where to dig?
Версия ОС: FreeBSD 8.1 Release

Answer 1

The problem is in the firewall, most likely related to nat on ipfw, but there are options. This is probably due to the fact that if there are several uprooted network interfaces, the system tries to use them. But since a cable is not connected to one of the interfaces and, accordingly, it cannot send anything anywhere, the packets that should be sent through it overflow the mbuf, which leads to the above errors. This also happens when using mpd, for example, while the packet was being processed, the tunnel had time to die. Basically, you can score. If you really don’t like it, but network shit, you can turn off the hardware checksum checksum, something like this:
ifconfig interface -TXCSUM -RXCSUM -VLAN_HWCSUM

Answer 2

The fact is that the machine falls off from time to time. It only helps to distort the interface above.
Yes, there really is nat and ipfw, there is also mpd, but only as one session for communication between offices.
The question is where to dig for a more accurate diagnosis? Does it make sense to increase m_buf?
Also on other versions of the OS, for example, 8.2, such problems were not noticed.
network IGB and EM at all disabled
-rxcsum -txcsum -lro -tso