23 Mar
2026
23 Mar
'26
7:15 p.m.
On 3/23/26 19:01, Laurent Vivier wrote:
iPXE, however, does not negotiate GUEST_CSUM, ignores the DATA_VALID flag entirely, and always verifies checksums. This caused TCP connections to fail: the SYN-ACK had a zero TCP checksum, iPXE rejected it, and the connection timed out in SYN_RCVD.
And if you're wondering who's behind this laziness, check the author's name... https://gitlab.com/qemu-project/ipxe/-/blob/master/src/drivers/net/virtio-ne... Thanks, Laurent