an issue with re(4) TX checksum hardware offloading. Interesting, I didn't have this problem on my 8169S(PCI) and it seems to only plague PCIe devices. Can you help me to do a test? on non-re(4) side: tcpdump -nv -i <ifcace> on your re(4) side: ping -n -c 1 -s 1512 <other-side> ping -n -c 10 -s 33 <other-side> Give me the output of the tcpdump. Thanks Best Regards, sephe -- Live Free or Die